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The JMethod.java Java example source code
/*
* Copyright (c) 1997, 2010, 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.codemodel.internal;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.Collections;
import java.util.Collection;
import com.sun.codemodel.internal.util.ClassNameComparator;
/**
* Java method.
*/
public class JMethod extends JGenerifiableImpl implements JDeclaration, JAnnotatable, JDocCommentable {
/**
* Modifiers for this method
*/
private JMods mods;
/**
* Return type for this method
*/
private JType type = null;
/**
* Name of this method
*/
private String name = null;
/**
* List of parameters for this method's declaration
*/
private final List<JVar> params = new ArrayList();
/**
* Set of exceptions that this method may throw.
* A set instance lazily created.
*/
private Set<JClass> _throws;
/**
* JBlock of statements that makes up the body this method
*/
private JBlock body = null;
private JDefinedClass outer;
/**
* javadoc comments for this JMethod
*/
private JDocComment jdoc = null;
/**
* Variable parameter for this method's varargs declaration
* introduced in J2SE 1.5
*/
private JVar varParam = null;
/**
* Annotations on this variable. Lazily created.
*/
private List<JAnnotationUse> annotations = null;
private boolean isConstructor() {
return type == null;
}
/** To set the default value for the
* annotation member
*/
private JExpression defaultValue = null;
/**
* JMethod constructor
*
* @param mods
* Modifiers for this method's declaration
*
* @param type
* Return type for the method
*
* @param name
* Name of this method
*/
JMethod(JDefinedClass outer, int mods, JType type, String name) {
this.mods = JMods.forMethod(mods);
this.type = type;
this.name = name;
this.outer = outer;
}
/**
* Constructor constructor
*
* @param mods
* Modifiers for this constructor's declaration
*
* @param _class
* JClass containing this constructor
*/
JMethod(int mods, JDefinedClass _class) {
this.mods = JMods.forMethod(mods);
this.type = null;
this.name = _class.name();
this.outer = _class;
}
private Set<JClass> getThrows() {
if(_throws==null)
_throws = new TreeSet<JClass>(ClassNameComparator.theInstance);
return _throws;
}
/**
* Add an exception to the list of exceptions that this
* method may throw.
*
* @param exception
* Name of an exception that this method may throw
*/
public JMethod _throws(JClass exception) {
getThrows().add(exception);
return this;
}
public JMethod _throws(Class<? extends Throwable> exception) {
return _throws(outer.owner().ref(exception));
}
/**
* Returns the list of variable of this method.
*
* @return List of parameters of this method. This list is not modifiable.
*/
public List<JVar> params() {
return Collections.<JVar>unmodifiableList(params);
}
/**
* Add the specified variable to the list of parameters
* for this method signature.
*
* @param type
* JType of the parameter being added
*
* @param name
* Name of the parameter being added
*
* @return New parameter variable
*/
public JVar param(int mods, JType type, String name) {
JVar v = new JVar(JMods.forVar(mods), type, name, null);
params.add(v);
return v;
}
public JVar param(JType type, String name) {
return param(JMod.NONE, type, name);
}
public JVar param(int mods, Class<?> type, String name) {
return param(mods, outer.owner()._ref(type), name);
}
public JVar param(Class<?> type, String name) {
return param(outer.owner()._ref(type), name);
}
/**
* @see #varParam(JType, String)
*/
public JVar varParam(Class<?> type, String name) {
return varParam(outer.owner()._ref(type),name);
}
/**
* Add the specified variable argument to the list of parameters
* for this method signature.
*
* @param type
* Type of the parameter being added.
*
* @param name
* Name of the parameter being added
*
* @return the variable parameter
*
* @throws IllegalStateException
* If this method is called twice.
* varargs in J2SE 1.5 can appear only once in the
* method signature.
*/
public JVar varParam(JType type, String name) {
if (!hasVarArgs()) {
varParam =
new JVar(
JMods.forVar(JMod.NONE),
type.array(),
name,
null);
return varParam;
} else {
throw new IllegalStateException(
"Cannot have two varargs in a method,\n"
+ "Check if varParam method of JMethod is"
+ " invoked more than once");
}
}
/**
* Adds an annotation to this variable.
* @param clazz
* The annotation class to annotate the field with
*/
public JAnnotationUse annotate(JClass clazz){
if(annotations==null)
annotations = new ArrayList<JAnnotationUse>();
JAnnotationUse a = new JAnnotationUse(clazz);
annotations.add(a);
return a;
}
/**
* Adds an annotation to this variable.
*
* @param clazz
* The annotation class to annotate the field with
*/
public JAnnotationUse annotate(Class <? extends Annotation> clazz){
return annotate(owner().ref(clazz));
}
public <W extends JAnnotationWriter> W annotate2(Class clazz) {
return TypedAnnotationWriter.create(clazz,this);
}
public Collection<JAnnotationUse> annotations() {
if (annotations == null)
annotations = new ArrayList<JAnnotationUse>();
return Collections.unmodifiableList(annotations);
}
/**
* Check if there are any varargs declared
* for this method signature.
*/
public boolean hasVarArgs() {
return this.varParam!=null;
}
public String name() {
return name;
}
/**
* Changes the name of the method.
*/
public void name(String n) {
this.name = n;
}
/**
* Returns the return type.
*/
public JType type() {
return type;
}
/**
* Overrides the return type.
*/
public void type(JType t) {
this.type = t;
}
/**
* Returns all the parameter types in an array.
* @return
* If there's no parameter, an empty array will be returned.
*/
public JType[] listParamTypes() {
JType[] r = new JType[params.size()];
for (int i = 0; i < r.length; i++)
r[i] = params.get(i).type();
return r;
}
/**
* Returns the varags parameter type.
* @return
* If there's no vararg parameter type, null will be returned.
*/
public JType listVarParamType() {
if (varParam != null)
return varParam.type();
else
return null;
}
/**
* Returns all the parameters in an array.
* @return
* If there's no parameter, an empty array will be returned.
*/
public JVar[] listParams() {
return params.toArray(new JVar[params.size()]);
}
/**
* Returns the variable parameter
* @return
* If there's no parameter, null will be returned.
*/
public JVar listVarParam() {
return varParam;
}
/**
* Returns true if the method has the specified signature.
*/
public boolean hasSignature(JType[] argTypes) {
JVar[] p = listParams();
if (p.length != argTypes.length)
return false;
for (int i = 0; i < p.length; i++)
if (!p[i].type().equals(argTypes[i]))
return false;
return true;
}
/**
* Get the block that makes up body of this method
*
* @return Body of method
*/
public JBlock body() {
if (body == null)
body = new JBlock();
return body;
}
/**
* Specify the default value for this annotation member
* @param value
* Default value for the annotation member
*
*/
public void declareDefaultValue(JExpression value){
this.defaultValue = value;
}
/**
* Creates, if necessary, and returns the class javadoc for this
* JDefinedClass
*
* @return JDocComment containing javadocs for this class
*/
public JDocComment javadoc() {
if (jdoc == null)
jdoc = new JDocComment(owner());
return jdoc;
}
public void declare(JFormatter f) {
if (jdoc != null)
f.g(jdoc);
if (annotations != null){
for (JAnnotationUse a : annotations)
f.g(a).nl();
}
f.g(mods);
// declare the generics parameters
super.declare(f);
if (!isConstructor())
f.g(type);
f.id(name).p('(').i();
// when parameters are printed in new lines, we want them to be indented.
// there's a good chance no newlines happen, too, but just in case it does.
boolean first = true;
for (JVar var : params) {
if (!first)
f.p(',');
if(var.isAnnotated())
f.nl();
f.b(var);
first = false;
}
if (hasVarArgs()) {
if (!first)
f.p(',');
f.g(varParam.type().elementType());
f.p("... ");
f.id(varParam.name());
}
f.o().p(')');
if (_throws!=null && !_throws.isEmpty()) {
f.nl().i().p("throws").g(_throws).nl().o();
}
if (defaultValue != null) {
f.p("default ");
f.g(defaultValue);
}
if (body != null) {
f.s(body);
} else if (
!outer.isInterface() && !outer.isAnnotationTypeDeclaration() && !mods.isAbstract() && !mods.isNative()) {
// Print an empty body for non-native, non-abstract methods
f.s(new JBlock());
} else {
f.p(';').nl();
}
}
/**
* @return
* the current modifiers of this method.
* Always return non-null valid object.
*/
public JMods mods() {
return mods;
}
/**
* @deprecated use {@link #mods()}
*/
public JMods getMods() {
return mods;
}
protected JCodeModel owner() {
return outer.owner();
}
}
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