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The Type.java Java example source code
/*
* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.javac.code;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;
import javax.lang.model.type.*;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.util.*;
import static com.sun.tools.javac.code.BoundKind.*;
import static com.sun.tools.javac.code.Flags.*;
import static com.sun.tools.javac.code.Kinds.*;
import static com.sun.tools.javac.code.TypeTag.*;
/** This class represents Java types. The class itself defines the behavior of
* the following types:
* <pre>
* base types (tags: BYTE, CHAR, SHORT, INT, LONG, FLOAT, DOUBLE, BOOLEAN),
* type `void' (tag: VOID),
* the bottom type (tag: BOT),
* the missing type (tag: NONE).
* </pre>
* <p>The behavior of the following types is defined in subclasses, which are
* all static inner classes of this class:
* <pre>
* class types (tag: CLASS, class: ClassType),
* array types (tag: ARRAY, class: ArrayType),
* method types (tag: METHOD, class: MethodType),
* package types (tag: PACKAGE, class: PackageType),
* type variables (tag: TYPEVAR, class: TypeVar),
* type arguments (tag: WILDCARD, class: WildcardType),
* generic method types (tag: FORALL, class: ForAll),
* the error type (tag: ERROR, class: ErrorType).
* </pre>
*
* <p>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*
* @see TypeTag
*/
public abstract class Type extends AnnoConstruct implements TypeMirror {
/** Constant type: no type at all. */
public static final JCNoType noType = new JCNoType();
/** Constant type: special type to be used during recovery of deferred expressions. */
public static final JCNoType recoveryType = new JCNoType();
/** Constant type: special type to be used for marking stuck trees. */
public static final JCNoType stuckType = new JCNoType();
/** If this switch is turned on, the names of type variables
* and anonymous classes are printed with hashcodes appended.
*/
public static boolean moreInfo = false;
/** The defining class / interface / package / type variable.
*/
public TypeSymbol tsym;
/**
* Checks if the current type tag is equal to the given tag.
* @return true if tag is equal to the current type tag.
*/
public boolean hasTag(TypeTag tag) {
return tag == getTag();
}
/**
* Returns the current type tag.
* @return the value of the current type tag.
*/
public abstract TypeTag getTag();
public boolean isNumeric() {
return false;
}
public boolean isPrimitive() {
return false;
}
public boolean isPrimitiveOrVoid() {
return false;
}
public boolean isReference() {
return false;
}
public boolean isNullOrReference() {
return false;
}
public boolean isPartial() {
return false;
}
/**
* The constant value of this type, null if this type does not
* have a constant value attribute. Only primitive types and
* strings (ClassType) can have a constant value attribute.
* @return the constant value attribute of this type
*/
public Object constValue() {
return null;
}
/** Is this a constant type whose value is false?
*/
public boolean isFalse() {
return false;
}
/** Is this a constant type whose value is true?
*/
public boolean isTrue() {
return false;
}
/**
* Get the representation of this type used for modelling purposes.
* By default, this is itself. For ErrorType, a different value
* may be provided.
*/
public Type getModelType() {
return this;
}
public static List<Type> getModelTypes(List ts) {
ListBuffer<Type> lb = new ListBuffer<>();
for (Type t: ts)
lb.append(t.getModelType());
return lb.toList();
}
/**For ErrorType, returns the original type, otherwise returns the type itself.
*/
public Type getOriginalType() {
return this;
}
public <R,S> R accept(Type.Visitor v, S s) { return v.visitType(this, s); }
/** Define a type given its tag and type symbol
*/
public Type(TypeSymbol tsym) {
this.tsym = tsym;
}
/** An abstract class for mappings from types to types
*/
public static abstract class Mapping {
private String name;
public Mapping(String name) {
this.name = name;
}
public abstract Type apply(Type t);
public String toString() {
return name;
}
}
/** map a type function over all immediate descendants of this type
*/
public Type map(Mapping f) {
return this;
}
/** map a type function over a list of types
*/
public static List<Type> map(List ts, Mapping f) {
if (ts.nonEmpty()) {
List<Type> tail1 = map(ts.tail, f);
Type t = f.apply(ts.head);
if (tail1 != ts.tail || t != ts.head)
return tail1.prepend(t);
}
return ts;
}
/** Define a constant type, of the same kind as this type
* and with given constant value
*/
public Type constType(Object constValue) {
throw new AssertionError();
}
/**
* If this is a constant type, return its underlying type.
* Otherwise, return the type itself.
*/
public Type baseType() {
return this;
}
public Type annotatedType(List<Attribute.TypeCompound> annos) {
return new AnnotatedType(annos, this);
}
public boolean isAnnotated() {
return false;
}
/**
* If this is an annotated type, return the underlying type.
* Otherwise, return the type itself.
*/
public Type unannotatedType() {
return this;
}
@Override
public List<Attribute.TypeCompound> getAnnotationMirrors() {
return List.nil();
}
@Override
public <A extends Annotation> A getAnnotation(Class annotationType) {
return null;
}
@Override
public <A extends Annotation> A[] getAnnotationsByType(Class annotationType) {
@SuppressWarnings("unchecked")
A[] tmp = (A[]) java.lang.reflect.Array.newInstance(annotationType, 0);
return tmp;
}
/** Return the base types of a list of types.
*/
public static List<Type> baseTypes(List ts) {
if (ts.nonEmpty()) {
Type t = ts.head.baseType();
List<Type> baseTypes = baseTypes(ts.tail);
if (t != ts.head || baseTypes != ts.tail)
return baseTypes.prepend(t);
}
return ts;
}
/** The Java source which this type represents.
*/
public String toString() {
String s = (tsym == null || tsym.name == null)
? "<none>"
: tsym.name.toString();
if (moreInfo && hasTag(TYPEVAR)) {
s = s + hashCode();
}
return s;
}
/**
* The Java source which this type list represents. A List is
* represented as a comma-spearated listing of the elements in
* that list.
*/
public static String toString(List<Type> ts) {
if (ts.isEmpty()) {
return "";
} else {
StringBuilder buf = new StringBuilder();
buf.append(ts.head.toString());
for (List<Type> l = ts.tail; l.nonEmpty(); l = l.tail)
buf.append(",").append(l.head.toString());
return buf.toString();
}
}
/**
* The constant value of this type, converted to String
*/
public String stringValue() {
Object cv = Assert.checkNonNull(constValue());
return cv.toString();
}
/**
* This method is analogous to isSameType, but weaker, since we
* never complete classes. Where isSameType would complete a
* class, equals assumes that the two types are different.
*/
@Override
public boolean equals(Object t) {
return super.equals(t);
}
@Override
public int hashCode() {
return super.hashCode();
}
public String argtypes(boolean varargs) {
List<Type> args = getParameterTypes();
if (!varargs) return args.toString();
StringBuilder buf = new StringBuilder();
while (args.tail.nonEmpty()) {
buf.append(args.head);
args = args.tail;
buf.append(',');
}
if (args.head.unannotatedType().hasTag(ARRAY)) {
buf.append(((ArrayType)args.head.unannotatedType()).elemtype);
if (args.head.getAnnotationMirrors().nonEmpty()) {
buf.append(args.head.getAnnotationMirrors());
}
buf.append("...");
} else {
buf.append(args.head);
}
return buf.toString();
}
/** Access methods.
*/
public List<Type> getTypeArguments() { return List.nil(); }
public Type getEnclosingType() { return null; }
public List<Type> getParameterTypes() { return List.nil(); }
public Type getReturnType() { return null; }
public Type getReceiverType() { return null; }
public List<Type> getThrownTypes() { return List.nil(); }
public Type getUpperBound() { return null; }
public Type getLowerBound() { return null; }
/** Navigation methods, these will work for classes, type variables,
* foralls, but will return null for arrays and methods.
*/
/** Return all parameters of this type and all its outer types in order
* outer (first) to inner (last).
*/
public List<Type> allparams() { return List.nil(); }
/** Does this type contain "error" elements?
*/
public boolean isErroneous() {
return false;
}
public static boolean isErroneous(List<Type> ts) {
for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
if (l.head.isErroneous()) return true;
return false;
}
/** Is this type parameterized?
* A class type is parameterized if it has some parameters.
* An array type is parameterized if its element type is parameterized.
* All other types are not parameterized.
*/
public boolean isParameterized() {
return false;
}
/** Is this type a raw type?
* A class type is a raw type if it misses some of its parameters.
* An array type is a raw type if its element type is raw.
* All other types are not raw.
* Type validation will ensure that the only raw types
* in a program are types that miss all their type variables.
*/
public boolean isRaw() {
return false;
}
public boolean isCompound() {
return tsym.completer == null
// Compound types can't have a completer. Calling
// flags() will complete the symbol causing the
// compiler to load classes unnecessarily. This led
// to regression 6180021.
&& (tsym.flags() & COMPOUND) != 0;
}
public boolean isInterface() {
return (tsym.flags() & INTERFACE) != 0;
}
public boolean isFinal() {
return (tsym.flags() & FINAL) != 0;
}
/**
* Does this type contain occurrences of type t?
*/
public boolean contains(Type t) {
return t == this;
}
public static boolean contains(List<Type> ts, Type t) {
for (List<Type> l = ts;
l.tail != null /*inlined: l.nonEmpty()*/;
l = l.tail)
if (l.head.contains(t)) return true;
return false;
}
/** Does this type contain an occurrence of some type in 'ts'?
*/
public boolean containsAny(List<Type> ts) {
for (Type t : ts)
if (this.contains(t)) return true;
return false;
}
public static boolean containsAny(List<Type> ts1, List ts2) {
for (Type t : ts1)
if (t.containsAny(ts2)) return true;
return false;
}
public static List<Type> filter(List ts, Filter tf) {
ListBuffer<Type> buf = new ListBuffer<>();
for (Type t : ts) {
if (tf.accepts(t)) {
buf.append(t);
}
}
return buf.toList();
}
public boolean isSuperBound() { return false; }
public boolean isExtendsBound() { return false; }
public boolean isUnbound() { return false; }
public Type withTypeVar(Type t) { return this; }
/** The underlying method type of this type.
*/
public MethodType asMethodType() { throw new AssertionError(); }
/** Complete loading all classes in this type.
*/
public void complete() {}
public TypeSymbol asElement() {
return tsym;
}
@Override
public TypeKind getKind() {
return TypeKind.OTHER;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
throw new AssertionError();
}
public static class JCPrimitiveType extends Type
implements javax.lang.model.type.PrimitiveType {
TypeTag tag;
public JCPrimitiveType(TypeTag tag, TypeSymbol tsym) {
super(tsym);
this.tag = tag;
Assert.check(tag.isPrimitive);
}
@Override
public boolean isNumeric() {
return tag != BOOLEAN;
}
@Override
public boolean isPrimitive() {
return true;
}
@Override
public TypeTag getTag() {
return tag;
}
@Override
public boolean isPrimitiveOrVoid() {
return true;
}
/** Define a constant type, of the same kind as this type
* and with given constant value
*/
@Override
public Type constType(Object constValue) {
final Object value = constValue;
return new JCPrimitiveType(tag, tsym) {
@Override
public Object constValue() {
return value;
}
@Override
public Type baseType() {
return tsym.type;
}
};
}
/**
* The constant value of this type, converted to String
*/
@Override
public String stringValue() {
Object cv = Assert.checkNonNull(constValue());
if (tag == BOOLEAN) {
return ((Integer) cv).intValue() == 0 ? "false" : "true";
}
else if (tag == CHAR) {
return String.valueOf((char) ((Integer) cv).intValue());
}
else {
return cv.toString();
}
}
/** Is this a constant type whose value is false?
*/
@Override
public boolean isFalse() {
return
tag == BOOLEAN &&
constValue() != null &&
((Integer)constValue()).intValue() == 0;
}
/** Is this a constant type whose value is true?
*/
@Override
public boolean isTrue() {
return
tag == BOOLEAN &&
constValue() != null &&
((Integer)constValue()).intValue() != 0;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitPrimitive(this, p);
}
@Override
public TypeKind getKind() {
switch (tag) {
case BYTE: return TypeKind.BYTE;
case CHAR: return TypeKind.CHAR;
case SHORT: return TypeKind.SHORT;
case INT: return TypeKind.INT;
case LONG: return TypeKind.LONG;
case FLOAT: return TypeKind.FLOAT;
case DOUBLE: return TypeKind.DOUBLE;
case BOOLEAN: return TypeKind.BOOLEAN;
}
throw new AssertionError();
}
}
public static class WildcardType extends Type
implements javax.lang.model.type.WildcardType {
public Type type;
public BoundKind kind;
public TypeVar bound;
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitWildcardType(this, s);
}
public WildcardType(Type type, BoundKind kind, TypeSymbol tsym) {
super(tsym);
this.type = Assert.checkNonNull(type);
this.kind = kind;
}
public WildcardType(WildcardType t, TypeVar bound) {
this(t.type, t.kind, t.tsym, bound);
}
public WildcardType(Type type, BoundKind kind, TypeSymbol tsym, TypeVar bound) {
this(type, kind, tsym);
this.bound = bound;
}
@Override
public TypeTag getTag() {
return WILDCARD;
}
@Override
public boolean contains(Type t) {
return kind != UNBOUND && type.contains(t);
}
public boolean isSuperBound() {
return kind == SUPER ||
kind == UNBOUND;
}
public boolean isExtendsBound() {
return kind == EXTENDS ||
kind == UNBOUND;
}
public boolean isUnbound() {
return kind == UNBOUND;
}
@Override
public boolean isReference() {
return true;
}
@Override
public boolean isNullOrReference() {
return true;
}
@Override
public Type withTypeVar(Type t) {
//-System.err.println(this+".withTypeVar("+t+");");//DEBUG
if (bound == t)
return this;
bound = (TypeVar)t;
return this;
}
boolean isPrintingBound = false;
public String toString() {
StringBuilder s = new StringBuilder();
s.append(kind.toString());
if (kind != UNBOUND)
s.append(type);
if (moreInfo && bound != null && !isPrintingBound)
try {
isPrintingBound = true;
s.append("{:").append(bound.bound).append(":}");
} finally {
isPrintingBound = false;
}
return s.toString();
}
public Type map(Mapping f) {
//- System.err.println(" (" + this + ").map(" + f + ")");//DEBUG
Type t = type;
if (t != null)
t = f.apply(t);
if (t == type)
return this;
else
return new WildcardType(t, kind, tsym, bound);
}
public Type getExtendsBound() {
if (kind == EXTENDS)
return type;
else
return null;
}
public Type getSuperBound() {
if (kind == SUPER)
return type;
else
return null;
}
public TypeKind getKind() {
return TypeKind.WILDCARD;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitWildcard(this, p);
}
}
public static class ClassType extends Type implements DeclaredType {
/** The enclosing type of this type. If this is the type of an inner
* class, outer_field refers to the type of its enclosing
* instance class, in all other cases it refers to noType.
*/
private Type outer_field;
/** The type parameters of this type (to be set once class is loaded).
*/
public List<Type> typarams_field;
/** A cache variable for the type parameters of this type,
* appended to all parameters of its enclosing class.
* @see #allparams
*/
public List<Type> allparams_field;
/** The supertype of this class (to be set once class is loaded).
*/
public Type supertype_field;
/** The interfaces of this class (to be set once class is loaded).
*/
public List<Type> interfaces_field;
/** All the interfaces of this class, including missing ones.
*/
public List<Type> all_interfaces_field;
public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym) {
super(tsym);
this.outer_field = outer;
this.typarams_field = typarams;
this.allparams_field = null;
this.supertype_field = null;
this.interfaces_field = null;
/*
// this can happen during error recovery
assert
outer.isParameterized() ?
typarams.length() == tsym.type.typarams().length() :
outer.isRaw() ?
typarams.length() == 0 :
true;
*/
}
@Override
public TypeTag getTag() {
return CLASS;
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitClassType(this, s);
}
public Type constType(Object constValue) {
final Object value = constValue;
return new ClassType(getEnclosingType(), typarams_field, tsym) {
@Override
public Object constValue() {
return value;
}
@Override
public Type baseType() {
return tsym.type;
}
};
}
/** The Java source which this type represents.
*/
public String toString() {
StringBuilder buf = new StringBuilder();
if (getEnclosingType().hasTag(CLASS) && tsym.owner.kind == TYP) {
buf.append(getEnclosingType().toString());
buf.append(".");
buf.append(className(tsym, false));
} else {
buf.append(className(tsym, true));
}
if (getTypeArguments().nonEmpty()) {
buf.append('<');
buf.append(getTypeArguments().toString());
buf.append(">");
}
return buf.toString();
}
//where
private String className(Symbol sym, boolean longform) {
if (sym.name.isEmpty() && (sym.flags() & COMPOUND) != 0) {
StringBuilder s = new StringBuilder(supertype_field.toString());
for (List<Type> is=interfaces_field; is.nonEmpty(); is = is.tail) {
s.append("&");
s.append(is.head.toString());
}
return s.toString();
} else if (sym.name.isEmpty()) {
String s;
ClassType norm = (ClassType) tsym.type.unannotatedType();
if (norm == null) {
s = Log.getLocalizedString("anonymous.class", (Object)null);
} else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
s = Log.getLocalizedString("anonymous.class",
norm.interfaces_field.head);
} else {
s = Log.getLocalizedString("anonymous.class",
norm.supertype_field);
}
if (moreInfo)
s += String.valueOf(sym.hashCode());
return s;
} else if (longform) {
return sym.getQualifiedName().toString();
} else {
return sym.name.toString();
}
}
public List<Type> getTypeArguments() {
if (typarams_field == null) {
complete();
if (typarams_field == null)
typarams_field = List.nil();
}
return typarams_field;
}
public boolean hasErasedSupertypes() {
return isRaw();
}
public Type getEnclosingType() {
return outer_field;
}
public void setEnclosingType(Type outer) {
outer_field = outer;
}
public List<Type> allparams() {
if (allparams_field == null) {
allparams_field = getTypeArguments().prependList(getEnclosingType().allparams());
}
return allparams_field;
}
public boolean isErroneous() {
return
getEnclosingType().isErroneous() ||
isErroneous(getTypeArguments()) ||
this != tsym.type.unannotatedType() && tsym.type.isErroneous();
}
public boolean isParameterized() {
return allparams().tail != null;
// optimization, was: allparams().nonEmpty();
}
@Override
public boolean isReference() {
return true;
}
@Override
public boolean isNullOrReference() {
return true;
}
/** A cache for the rank. */
int rank_field = -1;
/** A class type is raw if it misses some
* of its type parameter sections.
* After validation, this is equivalent to:
* {@code allparams.isEmpty() && tsym.type.allparams.nonEmpty(); }
*/
public boolean isRaw() {
return
this != tsym.type && // necessary, but not sufficient condition
tsym.type.allparams().nonEmpty() &&
allparams().isEmpty();
}
public Type map(Mapping f) {
Type outer = getEnclosingType();
Type outer1 = f.apply(outer);
List<Type> typarams = getTypeArguments();
List<Type> typarams1 = map(typarams, f);
if (outer1 == outer && typarams1 == typarams) return this;
else return new ClassType(outer1, typarams1, tsym);
}
public boolean contains(Type elem) {
return
elem == this
|| (isParameterized()
&& (getEnclosingType().contains(elem) || contains(getTypeArguments(), elem)))
|| (isCompound()
&& (supertype_field.contains(elem) || contains(interfaces_field, elem)));
}
public void complete() {
if (tsym.completer != null) tsym.complete();
}
public TypeKind getKind() {
return TypeKind.DECLARED;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitDeclared(this, p);
}
}
public static class ErasedClassType extends ClassType {
public ErasedClassType(Type outer, TypeSymbol tsym) {
super(outer, List.<Type>nil(), tsym);
}
@Override
public boolean hasErasedSupertypes() {
return true;
}
}
// a clone of a ClassType that knows about the alternatives of a union type.
public static class UnionClassType extends ClassType implements UnionType {
final List<? extends Type> alternatives_field;
public UnionClassType(ClassType ct, List<? extends Type> alternatives) {
super(ct.outer_field, ct.typarams_field, ct.tsym);
allparams_field = ct.allparams_field;
supertype_field = ct.supertype_field;
interfaces_field = ct.interfaces_field;
all_interfaces_field = ct.interfaces_field;
alternatives_field = alternatives;
}
public Type getLub() {
return tsym.type;
}
public java.util.List<? extends TypeMirror> getAlternatives() {
return Collections.unmodifiableList(alternatives_field);
}
@Override
public TypeKind getKind() {
return TypeKind.UNION;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitUnion(this, p);
}
}
// a clone of a ClassType that knows about the bounds of an intersection type.
public static class IntersectionClassType extends ClassType implements IntersectionType {
public boolean allInterfaces;
public IntersectionClassType(List<Type> bounds, ClassSymbol csym, boolean allInterfaces) {
super(Type.noType, List.<Type>nil(), csym);
this.allInterfaces = allInterfaces;
Assert.check((csym.flags() & COMPOUND) != 0);
supertype_field = bounds.head;
interfaces_field = bounds.tail;
Assert.check(supertype_field.tsym.completer != null ||
!supertype_field.isInterface(), supertype_field);
}
public java.util.List<? extends TypeMirror> getBounds() {
return Collections.unmodifiableList(getExplicitComponents());
}
public List<Type> getComponents() {
return interfaces_field.prepend(supertype_field);
}
public List<Type> getExplicitComponents() {
return allInterfaces ?
interfaces_field :
getComponents();
}
@Override
public TypeKind getKind() {
return TypeKind.INTERSECTION;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitIntersection(this, p);
}
}
public static class ArrayType extends Type
implements javax.lang.model.type.ArrayType {
public Type elemtype;
public ArrayType(Type elemtype, TypeSymbol arrayClass) {
super(arrayClass);
this.elemtype = elemtype;
}
@Override
public TypeTag getTag() {
return ARRAY;
}
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitArrayType(this, s);
}
public String toString() {
return elemtype + "[]";
}
public boolean equals(Object obj) {
return
this == obj ||
(obj instanceof ArrayType &&
this.elemtype.equals(((ArrayType)obj).elemtype));
}
public int hashCode() {
return (ARRAY.ordinal() << 5) + elemtype.hashCode();
}
public boolean isVarargs() {
return false;
}
public List<Type> allparams() { return elemtype.allparams(); }
public boolean isErroneous() {
return elemtype.isErroneous();
}
public boolean isParameterized() {
return elemtype.isParameterized();
}
@Override
public boolean isReference() {
return true;
}
@Override
public boolean isNullOrReference() {
return true;
}
public boolean isRaw() {
return elemtype.isRaw();
}
public ArrayType makeVarargs() {
return new ArrayType(elemtype, tsym) {
@Override
public boolean isVarargs() {
return true;
}
};
}
public Type map(Mapping f) {
Type elemtype1 = f.apply(elemtype);
if (elemtype1 == elemtype) return this;
else return new ArrayType(elemtype1, tsym);
}
public boolean contains(Type elem) {
return elem == this || elemtype.contains(elem);
}
public void complete() {
elemtype.complete();
}
public Type getComponentType() {
return elemtype;
}
public TypeKind getKind() {
return TypeKind.ARRAY;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitArray(this, p);
}
}
public static class MethodType extends Type implements ExecutableType {
public List<Type> argtypes;
public Type restype;
public List<Type> thrown;
/** The type annotations on the method receiver.
*/
public Type recvtype;
public MethodType(List<Type> argtypes,
Type restype,
List<Type> thrown,
TypeSymbol methodClass) {
super(methodClass);
this.argtypes = argtypes;
this.restype = restype;
this.thrown = thrown;
}
@Override
public TypeTag getTag() {
return METHOD;
}
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitMethodType(this, s);
}
/** The Java source which this type represents.
*
* XXX 06/09/99 iris This isn't correct Java syntax, but it probably
* should be.
*/
public String toString() {
return "(" + argtypes + ")" + restype;
}
public List<Type> getParameterTypes() { return argtypes; }
public Type getReturnType() { return restype; }
public Type getReceiverType() { return recvtype; }
public List<Type> getThrownTypes() { return thrown; }
public boolean isErroneous() {
return
isErroneous(argtypes) ||
restype != null && restype.isErroneous();
}
public Type map(Mapping f) {
List<Type> argtypes1 = map(argtypes, f);
Type restype1 = f.apply(restype);
List<Type> thrown1 = map(thrown, f);
if (argtypes1 == argtypes &&
restype1 == restype &&
thrown1 == thrown) return this;
else return new MethodType(argtypes1, restype1, thrown1, tsym);
}
public boolean contains(Type elem) {
return elem == this || contains(argtypes, elem) || restype.contains(elem) || contains(thrown, elem);
}
public MethodType asMethodType() { return this; }
public void complete() {
for (List<Type> l = argtypes; l.nonEmpty(); l = l.tail)
l.head.complete();
restype.complete();
recvtype.complete();
for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
l.head.complete();
}
public List<TypeVar> getTypeVariables() {
return List.nil();
}
public TypeSymbol asElement() {
return null;
}
public TypeKind getKind() {
return TypeKind.EXECUTABLE;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitExecutable(this, p);
}
}
public static class PackageType extends Type implements NoType {
PackageType(TypeSymbol tsym) {
super(tsym);
}
@Override
public TypeTag getTag() {
return PACKAGE;
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitPackageType(this, s);
}
public String toString() {
return tsym.getQualifiedName().toString();
}
public TypeKind getKind() {
return TypeKind.PACKAGE;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitNoType(this, p);
}
}
public static class TypeVar extends Type implements TypeVariable {
/** The upper bound of this type variable; set from outside.
* Must be nonempty once it is set.
* For a bound, `bound' is the bound type itself.
* Multiple bounds are expressed as a single class type which has the
* individual bounds as superclass, respectively interfaces.
* The class type then has as `tsym' a compiler generated class `c',
* which has a flag COMPOUND and whose owner is the type variable
* itself. Furthermore, the erasure_field of the class
* points to the first class or interface bound.
*/
public Type bound = null;
/** The lower bound of this type variable.
* TypeVars don't normally have a lower bound, so it is normally set
* to syms.botType.
* Subtypes, such as CapturedType, may provide a different value.
*/
public Type lower;
public TypeVar(Name name, Symbol owner, Type lower) {
super(null);
tsym = new TypeVariableSymbol(0, name, this, owner);
this.lower = lower;
}
public TypeVar(TypeSymbol tsym, Type bound, Type lower) {
super(tsym);
this.bound = bound;
this.lower = lower;
}
@Override
public TypeTag getTag() {
return TYPEVAR;
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitTypeVar(this, s);
}
@Override
public Type getUpperBound() {
if ((bound == null || bound.hasTag(NONE)) && this != tsym.type) {
bound = tsym.type.getUpperBound();
}
return bound;
}
int rank_field = -1;
@Override
public Type getLowerBound() {
return lower;
}
public TypeKind getKind() {
return TypeKind.TYPEVAR;
}
public boolean isCaptured() {
return false;
}
@Override
public boolean isReference() {
return true;
}
@Override
public boolean isNullOrReference() {
return true;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitTypeVariable(this, p);
}
}
/** A captured type variable comes from wildcards which can have
* both upper and lower bound. CapturedType extends TypeVar with
* a lower bound.
*/
public static class CapturedType extends TypeVar {
public WildcardType wildcard;
public CapturedType(Name name,
Symbol owner,
Type upper,
Type lower,
WildcardType wildcard) {
super(name, owner, lower);
this.lower = Assert.checkNonNull(lower);
this.bound = upper;
this.wildcard = wildcard;
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitCapturedType(this, s);
}
@Override
public boolean isCaptured() {
return true;
}
@Override
public String toString() {
return "capture#"
+ (hashCode() & 0xFFFFFFFFL) % Printer.PRIME
+ " of "
+ wildcard;
}
}
public static abstract class DelegatedType extends Type {
public Type qtype;
public TypeTag tag;
public DelegatedType(TypeTag tag, Type qtype) {
super(qtype.tsym);
this.tag = tag;
this.qtype = qtype;
}
public TypeTag getTag() { return tag; }
public String toString() { return qtype.toString(); }
public List<Type> getTypeArguments() { return qtype.getTypeArguments(); }
public Type getEnclosingType() { return qtype.getEnclosingType(); }
public List<Type> getParameterTypes() { return qtype.getParameterTypes(); }
public Type getReturnType() { return qtype.getReturnType(); }
public Type getReceiverType() { return qtype.getReceiverType(); }
public List<Type> getThrownTypes() { return qtype.getThrownTypes(); }
public List<Type> allparams() { return qtype.allparams(); }
public Type getUpperBound() { return qtype.getUpperBound(); }
public boolean isErroneous() { return qtype.isErroneous(); }
}
/**
* The type of a generic method type. It consists of a method type and
* a list of method type-parameters that are used within the method
* type.
*/
public static class ForAll extends DelegatedType implements ExecutableType {
public List<Type> tvars;
public ForAll(List<Type> tvars, Type qtype) {
super(FORALL, (MethodType)qtype);
this.tvars = tvars;
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitForAll(this, s);
}
public String toString() {
return "<" + tvars + ">" + qtype;
}
public List<Type> getTypeArguments() { return tvars; }
public boolean isErroneous() {
return qtype.isErroneous();
}
public Type map(Mapping f) {
return f.apply(qtype);
}
public boolean contains(Type elem) {
return qtype.contains(elem);
}
public MethodType asMethodType() {
return (MethodType)qtype;
}
public void complete() {
for (List<Type> l = tvars; l.nonEmpty(); l = l.tail) {
((TypeVar)l.head).bound.complete();
}
qtype.complete();
}
public List<TypeVar> getTypeVariables() {
return List.convert(TypeVar.class, getTypeArguments());
}
public TypeKind getKind() {
return TypeKind.EXECUTABLE;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitExecutable(this, p);
}
}
/** A class for inference variables, for use during method/diamond type
* inference. An inference variable has upper/lower bounds and a set
* of equality constraints. Such bounds are set during subtyping, type-containment,
* type-equality checks, when the types being tested contain inference variables.
* A change listener can be attached to an inference variable, to receive notifications
* whenever the bounds of an inference variable change.
*/
public static class UndetVar extends DelegatedType {
/** Inference variable change listener. The listener method is called
* whenever a change to the inference variable's bounds occurs
*/
public interface UndetVarListener {
/** called when some inference variable bounds (of given kinds ibs) change */
void varChanged(UndetVar uv, Set<InferenceBound> ibs);
}
/**
* Inference variable bound kinds
*/
public enum InferenceBound {
/** upper bounds */
UPPER,
/** lower bounds */
LOWER,
/** equality constraints */
EQ;
}
/** inference variable bounds */
protected Map<InferenceBound, List bounds;
/** inference variable's inferred type (set from Infer.java) */
public Type inst = null;
/** number of declared (upper) bounds */
public int declaredCount;
/** inference variable's change listener */
public UndetVarListener listener = null;
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitUndetVar(this, s);
}
public UndetVar(TypeVar origin, Types types) {
super(UNDETVAR, origin);
bounds = new EnumMap<InferenceBound, List(InferenceBound.class);
List<Type> declaredBounds = types.getBounds(origin);
declaredCount = declaredBounds.length();
bounds.put(InferenceBound.UPPER, declaredBounds);
bounds.put(InferenceBound.LOWER, List.<Type>nil());
bounds.put(InferenceBound.EQ, List.<Type>nil());
}
public String toString() {
if (inst != null) return inst.toString();
else return qtype + "?";
}
@Override
public boolean isPartial() {
return true;
}
@Override
public Type baseType() {
if (inst != null) return inst.baseType();
else return this;
}
/** get all bounds of a given kind */
public List<Type> getBounds(InferenceBound... ibs) {
ListBuffer<Type> buf = new ListBuffer<>();
for (InferenceBound ib : ibs) {
buf.appendList(bounds.get(ib));
}
return buf.toList();
}
/** get the list of declared (upper) bounds */
public List<Type> getDeclaredBounds() {
ListBuffer<Type> buf = new ListBuffer<>();
int count = 0;
for (Type b : getBounds(InferenceBound.UPPER)) {
if (count++ == declaredCount) break;
buf.append(b);
}
return buf.toList();
}
/** internal method used to override an undetvar bounds */
public void setBounds(InferenceBound ib, List<Type> newBounds) {
bounds.put(ib, newBounds);
}
/** add a bound of a given kind - this might trigger listener notification */
public final void addBound(InferenceBound ib, Type bound, Types types) {
addBound(ib, bound, types, false);
}
protected void addBound(InferenceBound ib, Type bound, Types types, boolean update) {
Type bound2 = toTypeVarMap.apply(bound).baseType();
List<Type> prevBounds = bounds.get(ib);
for (Type b : prevBounds) {
//check for redundancy - use strict version of isSameType on tvars
//(as the standard version will lead to false positives w.r.t. clones ivars)
if (types.isSameType(b, bound2, true) || bound == qtype) return;
}
bounds.put(ib, prevBounds.prepend(bound2));
notifyChange(EnumSet.of(ib));
}
//where
Type.Mapping toTypeVarMap = new Mapping("toTypeVarMap") {
@Override
public Type apply(Type t) {
if (t.hasTag(UNDETVAR)) {
UndetVar uv = (UndetVar)t;
return uv.inst != null ? uv.inst : uv.qtype;
} else {
return t.map(this);
}
}
};
/** replace types in all bounds - this might trigger listener notification */
public void substBounds(List<Type> from, List to, Types types) {
List<Type> instVars = from.diff(to);
//if set of instantiated ivars is empty, there's nothing to do!
if (instVars.isEmpty()) return;
final EnumSet<InferenceBound> boundsChanged = EnumSet.noneOf(InferenceBound.class);
UndetVarListener prevListener = listener;
try {
//setup new listener for keeping track of changed bounds
listener = new UndetVarListener() {
public void varChanged(UndetVar uv, Set<InferenceBound> ibs) {
boundsChanged.addAll(ibs);
}
};
for (Map.Entry<InferenceBound, List _entry : bounds.entrySet()) {
InferenceBound ib = _entry.getKey();
List<Type> prevBounds = _entry.getValue();
ListBuffer<Type> newBounds = new ListBuffer<>();
ListBuffer<Type> deps = new ListBuffer<>();
//step 1 - re-add bounds that are not dependent on ivars
for (Type t : prevBounds) {
if (!t.containsAny(instVars)) {
newBounds.append(t);
} else {
deps.append(t);
}
}
//step 2 - replace bounds
bounds.put(ib, newBounds.toList());
//step 3 - for each dependency, add new replaced bound
for (Type dep : deps) {
addBound(ib, types.subst(dep, from, to), types, true);
}
}
} finally {
listener = prevListener;
if (!boundsChanged.isEmpty()) {
notifyChange(boundsChanged);
}
}
}
private void notifyChange(EnumSet<InferenceBound> ibs) {
if (listener != null) {
listener.varChanged(this, ibs);
}
}
public boolean isCaptured() {
return false;
}
}
/**
* This class is used to represent synthetic captured inference variables
* that can be generated during nested generic method calls. The only difference
* between these inference variables and ordinary ones is that captured inference
* variables cannot get new bounds through incorporation.
*/
public static class CapturedUndetVar extends UndetVar {
public CapturedUndetVar(CapturedType origin, Types types) {
super(origin, types);
if (!origin.lower.hasTag(BOT)) {
bounds.put(InferenceBound.LOWER, List.of(origin.lower));
}
}
@Override
public void addBound(InferenceBound ib, Type bound, Types types, boolean update) {
if (update) {
//only change bounds if request comes from substBounds
super.addBound(ib, bound, types, update);
}
}
@Override
public boolean isCaptured() {
return true;
}
}
/** Represents NONE.
*/
public static class JCNoType extends Type implements NoType {
public JCNoType() {
super(null);
}
@Override
public TypeTag getTag() {
return NONE;
}
@Override
public TypeKind getKind() {
return TypeKind.NONE;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitNoType(this, p);
}
@Override
public boolean isCompound() { return false; }
}
/** Represents VOID.
*/
public static class JCVoidType extends Type implements NoType {
public JCVoidType() {
super(null);
}
@Override
public TypeTag getTag() {
return VOID;
}
@Override
public TypeKind getKind() {
return TypeKind.VOID;
}
@Override
public boolean isCompound() { return false; }
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitNoType(this, p);
}
@Override
public boolean isPrimitiveOrVoid() {
return true;
}
}
static class BottomType extends Type implements NullType {
public BottomType() {
super(null);
}
@Override
public TypeTag getTag() {
return BOT;
}
@Override
public TypeKind getKind() {
return TypeKind.NULL;
}
@Override
public boolean isCompound() { return false; }
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitNull(this, p);
}
@Override
public Type constType(Object value) {
return this;
}
@Override
public String stringValue() {
return "null";
}
@Override
public boolean isNullOrReference() {
return true;
}
}
public static class ErrorType extends ClassType
implements javax.lang.model.type.ErrorType {
private Type originalType = null;
public ErrorType(Type originalType, TypeSymbol tsym) {
super(noType, List.<Type>nil(), null);
this.tsym = tsym;
this.originalType = (originalType == null ? noType : originalType);
}
public ErrorType(ClassSymbol c, Type originalType) {
this(originalType, c);
c.type = this;
c.kind = ERR;
c.members_field = new Scope.ErrorScope(c);
}
@Override
public TypeTag getTag() {
return ERROR;
}
@Override
public boolean isPartial() {
return true;
}
@Override
public boolean isReference() {
return true;
}
@Override
public boolean isNullOrReference() {
return true;
}
public ErrorType(Name name, TypeSymbol container, Type originalType) {
this(new ClassSymbol(PUBLIC|STATIC|ACYCLIC, name, null, container), originalType);
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitErrorType(this, s);
}
public Type constType(Object constValue) { return this; }
public Type getEnclosingType() { return this; }
public Type getReturnType() { return this; }
public Type asSub(Symbol sym) { return this; }
public Type map(Mapping f) { return this; }
public boolean isGenType(Type t) { return true; }
public boolean isErroneous() { return true; }
public boolean isCompound() { return false; }
public boolean isInterface() { return false; }
public List<Type> allparams() { return List.nil(); }
public List<Type> getTypeArguments() { return List.nil(); }
public TypeKind getKind() {
return TypeKind.ERROR;
}
public Type getOriginalType() {
return originalType;
}
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitError(this, p);
}
}
public static class AnnotatedType extends Type
implements
javax.lang.model.type.ArrayType,
javax.lang.model.type.DeclaredType,
javax.lang.model.type.PrimitiveType,
javax.lang.model.type.TypeVariable,
javax.lang.model.type.WildcardType {
/** The type annotations on this type.
*/
private List<Attribute.TypeCompound> typeAnnotations;
/** The underlying type that is annotated.
*/
private Type underlyingType;
protected AnnotatedType(List<Attribute.TypeCompound> typeAnnotations,
Type underlyingType) {
super(underlyingType.tsym);
this.typeAnnotations = typeAnnotations;
this.underlyingType = underlyingType;
Assert.check(typeAnnotations != null && typeAnnotations.nonEmpty(),
"Can't create AnnotatedType without annotations: " + underlyingType);
Assert.check(!underlyingType.isAnnotated(),
"Can't annotate already annotated type: " + underlyingType +
"; adding: " + typeAnnotations);
}
@Override
public TypeTag getTag() {
return underlyingType.getTag();
}
@Override
public boolean isAnnotated() {
return true;
}
@Override
public List<Attribute.TypeCompound> getAnnotationMirrors() {
return typeAnnotations;
}
@Override
public TypeKind getKind() {
return underlyingType.getKind();
}
@Override
public Type unannotatedType() {
return underlyingType;
}
@Override
public <R,S> R accept(Type.Visitor v, S s) {
return v.visitAnnotatedType(this, s);
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return underlyingType.accept(v, p);
}
@Override
public Type map(Mapping f) {
underlyingType.map(f);
return this;
}
@Override
public Type constType(Object constValue) { return underlyingType.constType(constValue); }
@Override
public Type getEnclosingType() { return underlyingType.getEnclosingType(); }
@Override
public Type getReturnType() { return underlyingType.getReturnType(); }
@Override
public List<Type> getTypeArguments() { return underlyingType.getTypeArguments(); }
@Override
public List<Type> getParameterTypes() { return underlyingType.getParameterTypes(); }
@Override
public Type getReceiverType() { return underlyingType.getReceiverType(); }
@Override
public List<Type> getThrownTypes() { return underlyingType.getThrownTypes(); }
@Override
public Type getUpperBound() { return underlyingType.getUpperBound(); }
@Override
public Type getLowerBound() { return underlyingType.getLowerBound(); }
@Override
public boolean isErroneous() { return underlyingType.isErroneous(); }
@Override
public boolean isCompound() { return underlyingType.isCompound(); }
@Override
public boolean isInterface() { return underlyingType.isInterface(); }
@Override
public List<Type> allparams() { return underlyingType.allparams(); }
@Override
public boolean isPrimitive() { return underlyingType.isPrimitive(); }
@Override
public boolean isPrimitiveOrVoid() { return underlyingType.isPrimitiveOrVoid(); }
@Override
public boolean isNumeric() { return underlyingType.isNumeric(); }
@Override
public boolean isReference() { return underlyingType.isReference(); }
@Override
public boolean isNullOrReference() { return underlyingType.isNullOrReference(); }
@Override
public boolean isPartial() { return underlyingType.isPartial(); }
@Override
public boolean isParameterized() { return underlyingType.isParameterized(); }
@Override
public boolean isRaw() { return underlyingType.isRaw(); }
@Override
public boolean isFinal() { return underlyingType.isFinal(); }
@Override
public boolean isSuperBound() { return underlyingType.isSuperBound(); }
@Override
public boolean isExtendsBound() { return underlyingType.isExtendsBound(); }
@Override
public boolean isUnbound() { return underlyingType.isUnbound(); }
@Override
public String toString() {
// This method is only used for internal debugging output.
// See
// com.sun.tools.javac.code.Printer.visitAnnotatedType(AnnotatedType, Locale)
// for the user-visible logic.
if (typeAnnotations != null &&
!typeAnnotations.isEmpty()) {
return "(" + typeAnnotations.toString() + " :: " + underlyingType.toString() + ")";
} else {
return "({} :: " + underlyingType.toString() +")";
}
}
@Override
public boolean contains(Type t) { return underlyingType.contains(t); }
@Override
public Type withTypeVar(Type t) {
// Don't create a new AnnotatedType, as 'this' will
// get its annotations set later.
underlyingType = underlyingType.withTypeVar(t);
return this;
}
// TODO: attach annotations?
@Override
public TypeSymbol asElement() { return underlyingType.asElement(); }
// TODO: attach annotations?
@Override
public MethodType asMethodType() { return underlyingType.asMethodType(); }
@Override
public void complete() { underlyingType.complete(); }
@Override
public TypeMirror getComponentType() { return ((ArrayType)underlyingType).getComponentType(); }
// The result is an ArrayType, but only in the model sense, not the Type sense.
public Type makeVarargs() {
return ((ArrayType) underlyingType).makeVarargs().annotatedType(typeAnnotations);
}
@Override
public TypeMirror getExtendsBound() { return ((WildcardType)underlyingType).getExtendsBound(); }
@Override
public TypeMirror getSuperBound() { return ((WildcardType)underlyingType).getSuperBound(); }
}
public static class UnknownType extends Type {
public UnknownType() {
super(null);
}
@Override
public TypeTag getTag() {
return UNKNOWN;
}
@Override
public <R, P> R accept(TypeVisitor v, P p) {
return v.visitUnknown(this, p);
}
@Override
public boolean isPartial() {
return true;
}
}
/**
* A visitor for types. A visitor is used to implement operations
* (or relations) on types. Most common operations on types are
* binary relations and this interface is designed for binary
* relations, that is, operations of the form
* Type × S ? R.
* <!-- In plain text: Type x S -> R -->
*
* @param <R> the return type of the operation implemented by this
* visitor; use Void if no return type is needed.
* @param <S> the type of the second argument (the first being the
* type itself) of the operation implemented by this visitor; use
* Void if a second argument is not needed.
*/
public interface Visitor<R,S> {
R visitClassType(ClassType t, S s);
R visitWildcardType(WildcardType t, S s);
R visitArrayType(ArrayType t, S s);
R visitMethodType(MethodType t, S s);
R visitPackageType(PackageType t, S s);
R visitTypeVar(TypeVar t, S s);
R visitCapturedType(CapturedType t, S s);
R visitForAll(ForAll t, S s);
R visitUndetVar(UndetVar t, S s);
R visitErrorType(ErrorType t, S s);
R visitAnnotatedType(AnnotatedType t, S s);
R visitType(Type t, S s);
}
}
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