Java example source code file (TargetType.java)
The TargetType.java Java example source code/*
* Copyright (c) 2008, 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 com.sun.tools.javac.util.Assert;
/**
* Describes the type of program element an extended annotation (or extended
* compound attribute) targets.
*
* By comparison, a Tree.Kind has enum values for all elements in the AST, and
* it does not provide enough resolution for type arguments (i.e., whether an
* annotation targets a type argument in a local variable, method return type,
* or a typecast).
*
* <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>
*/
// Code duplicated in com.sun.tools.classfile.TypeAnnotation.TargetType
public enum TargetType {
/** For annotations on a class type parameter declaration. */
CLASS_TYPE_PARAMETER(0x00),
/** For annotations on a method type parameter declaration. */
METHOD_TYPE_PARAMETER(0x01),
/** For annotations on the type of an "extends" or "implements" clause. */
CLASS_EXTENDS(0x10),
/** For annotations on a bound of a type parameter of a class. */
CLASS_TYPE_PARAMETER_BOUND(0x11),
/** For annotations on a bound of a type parameter of a method. */
METHOD_TYPE_PARAMETER_BOUND(0x12),
/** For annotations on a field. */
FIELD(0x13),
/** For annotations on a method return type. */
METHOD_RETURN(0x14),
/** For annotations on the method receiver. */
METHOD_RECEIVER(0x15),
/** For annotations on a method parameter. */
METHOD_FORMAL_PARAMETER(0x16),
/** For annotations on a throws clause in a method declaration. */
THROWS(0x17),
/** For annotations on a local variable. */
LOCAL_VARIABLE(0x40, true),
/** For annotations on a resource variable. */
RESOURCE_VARIABLE(0x41, true),
/** For annotations on an exception parameter. */
EXCEPTION_PARAMETER(0x42, true),
/** For annotations on a type test. */
INSTANCEOF(0x43, true),
/** For annotations on an object creation expression. */
NEW(0x44, true),
/** For annotations on a constructor reference receiver. */
CONSTRUCTOR_REFERENCE(0x45, true),
/** For annotations on a method reference receiver. */
METHOD_REFERENCE(0x46, true),
/** For annotations on a typecast. */
CAST(0x47, true),
/** For annotations on a type argument of an object creation expression. */
CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT(0x48, true),
/** For annotations on a type argument of a method call. */
METHOD_INVOCATION_TYPE_ARGUMENT(0x49, true),
/** For annotations on a type argument of a constructor reference. */
CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT(0x4A, true),
/** For annotations on a type argument of a method reference. */
METHOD_REFERENCE_TYPE_ARGUMENT(0x4B, true),
/** For annotations with an unknown target. */
UNKNOWN(0xFF);
private static final int MAXIMUM_TARGET_TYPE_VALUE = 0x4B;
private final int targetTypeValue;
private final boolean isLocal;
private TargetType(int targetTypeValue) {
this(targetTypeValue, false);
}
private TargetType(int targetTypeValue, boolean isLocal) {
if (targetTypeValue < 0
|| targetTypeValue > 255)
Assert.error("Attribute type value needs to be an unsigned byte: " + String.format("0x%02X", targetTypeValue));
this.targetTypeValue = targetTypeValue;
this.isLocal = isLocal;
}
/**
* Returns whether or not this TargetType represents an annotation whose
* target is exclusively a tree in a method body
*
* Note: wildcard bound targets could target a local tree and a class
* member declaration signature tree
*/
public boolean isLocal() {
return isLocal;
}
public int targetTypeValue() {
return this.targetTypeValue;
}
private static final TargetType[] targets;
static {
targets = new TargetType[MAXIMUM_TARGET_TYPE_VALUE + 1];
TargetType[] alltargets = values();
for (TargetType target : alltargets) {
if (target.targetTypeValue != UNKNOWN.targetTypeValue)
targets[target.targetTypeValue] = target;
}
for (int i = 0; i <= MAXIMUM_TARGET_TYPE_VALUE; ++i) {
if (targets[i] == null)
targets[i] = UNKNOWN;
}
}
public static boolean isValidTargetTypeValue(int tag) {
if (tag == UNKNOWN.targetTypeValue)
return true;
return (tag >= 0 && tag < targets.length);
}
public static TargetType fromTargetTypeValue(int tag) {
if (tag == UNKNOWN.targetTypeValue)
return UNKNOWN;
if (tag < 0 || tag >= targets.length)
Assert.error("Unknown TargetType: " + tag);
return targets[tag];
}
}
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