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/*
* 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 javassist.bytecode;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Map;
/**
* <code>NestMembers_attribute</code>.
* It was introduced by JEP-181. See JVMS 4.7.29 for the specification.
*/
public class NestMembersAttribute extends AttributeInfo {
/**
* The name of this attribute <code>"NestMembers"</code>.
*/
public static final String tag = "NestMembers";
NestMembersAttribute(ConstPool cp, int n, DataInputStream in) throws IOException {
super(cp, n, in);
}
private NestMembersAttribute(ConstPool cp, byte[] info) {
super(cp, tag, info);
}
/**
* Makes a copy. Class names are replaced according to the
* given <code>Map</code> object.
*
* @param newCp the constant pool table used by the new copy.
* @param classnames pairs of replaced and substituted
* class names.
*/
@Override
public AttributeInfo copy(ConstPool newCp, Map<String, String> classnames) {
byte[] src = get();
byte[] dest = new byte[src.length];
ConstPool cp = getConstPool();
int n = ByteArray.readU16bit(src, 0);
ByteArray.write16bit(n, dest, 0);
for (int i = 0, j = 2; i < n; ++i, j += 2) {
int index = ByteArray.readU16bit(src, j);
int newIndex = cp.copy(index, newCp, classnames);
ByteArray.write16bit(newIndex, dest, j);
}
return new NestMembersAttribute(newCp, dest);
}
/**
* Returns <code>number_of_classes</code>.
* @return the number of the classes recorded in this attribute.
*/
public int numberOfClasses() {
return ByteArray.readU16bit(info, 0);
}
/** Returns <code>classes[index]</code>.
*
* @param index the index into <code>classes</code>.
* @return the value at the given index in the <code>classes</code> array.
* It is an index into the constant pool.
* The constant pool entry at the returned index is a
* <code>CONSTANT_Class_info</code> structure.
*/
public int memberClass(int index) {
return ByteArray.readU16bit(info, index * 2 + 2);
}
}
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