scouter.javassist.bytecode.EnclosingMethodAttribute Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package scouter.javassist.bytecode;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Map;
import scouter.javassist.bytecode.AttributeInfo;
import scouter.javassist.bytecode.ByteArray;
import scouter.javassist.bytecode.ConstPool;
import scouter.javassist.bytecode.MethodInfo;
/**
* EnclosingMethod_attribute.
*/
public class EnclosingMethodAttribute extends AttributeInfo {
/**
* The name of this attribute "EnclosingMethod".
*/
public static final String tag = "EnclosingMethod";
EnclosingMethodAttribute(ConstPool cp, int n, DataInputStream in)
throws IOException
{
super(cp, n, in);
}
/**
* Constructs an EnclosingMethod attribute.
*
* @param cp a constant pool table.
* @param className the name of the innermost enclosing class.
* @param methodName the name of the enclosing method.
* @param methodDesc the descriptor of the enclosing method.
*/
public EnclosingMethodAttribute(ConstPool cp, String className,
String methodName, String methodDesc) {
super(cp, tag);
int ci = cp.addClassInfo(className);
int ni = cp.addNameAndTypeInfo(methodName, methodDesc);
byte[] bvalue = new byte[4];
bvalue[0] = (byte)(ci >>> 8);
bvalue[1] = (byte)ci;
bvalue[2] = (byte)(ni >>> 8);
bvalue[3] = (byte)ni;
set(bvalue);
}
/**
* Constructs an EnclosingMethod attribute.
* The value of method_index is set to 0.
*
* @param cp a constant pool table.
* @param className the name of the innermost enclosing class.
*/
public EnclosingMethodAttribute(ConstPool cp, String className) {
super(cp, tag);
int ci = cp.addClassInfo(className);
int ni = 0;
byte[] bvalue = new byte[4];
bvalue[0] = (byte)(ci >>> 8);
bvalue[1] = (byte)ci;
bvalue[2] = (byte)(ni >>> 8);
bvalue[3] = (byte)ni;
set(bvalue);
}
/**
* Returns the value of class_index.
*/
public int classIndex() {
return ByteArray.readU16bit(get(), 0);
}
/**
* Returns the value of method_index.
*/
public int methodIndex() {
return ByteArray.readU16bit(get(), 2);
}
/**
* Returns the name of the class specified by class_index.
*/
public String className() {
return getConstPool().getClassInfo(classIndex());
}
/**
* Returns the method name specified by method_index.
* If the method is a class initializer (static constructor),
* {@link MethodInfo#nameClinit} is returned.
*/
public String methodName() {
ConstPool cp = getConstPool();
int mi = methodIndex();
if (mi == 0)
return MethodInfo.nameClinit;
else {
int ni = cp.getNameAndTypeName(mi);
return cp.getUtf8Info(ni);
}
}
/**
* Returns the method descriptor specified by method_index.
*/
public String methodDescriptor() {
ConstPool cp = getConstPool();
int mi = methodIndex();
int ti = cp.getNameAndTypeDescriptor(mi);
return cp.getUtf8Info(ti);
}
/**
* Makes a copy. Class names are replaced according to the
* given Map object.
*
* @param newCp the constant pool table used by the new copy.
* @param classnames pairs of replaced and substituted
* class names.
*/
public AttributeInfo copy(ConstPool newCp, Map classnames) {
if (methodIndex() == 0)
return new EnclosingMethodAttribute(newCp, className());
else
return new EnclosingMethodAttribute(newCp, className(),
methodName(), methodDescriptor());
}
}