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Apache Commons Bytecode Engineering Library
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.Const;
/**
* This class is derived from Attribute and records the nest host of the nest
* to which the current class or interface claims to belong.
* There may be at most one NestHost attribute in a ClassFile structure.
*
* @see Attribute
*/
public final class NestHost extends Attribute {
private int host_class_index;
/**
* Initializes from another object. Note that both objects use the same
* references (shallow copy). Use copy() for a physical copy.
*/
public NestHost(final NestHost c) {
this(c.getNameIndex(), c.getLength(), c.getHostClassIndex(), c.getConstantPool());
}
/**
* @param name_index Index in constant pool
* @param length Content length in bytes
* @param host_class_index Host class index
* @param constant_pool Array of constants
*/
public NestHost(final int name_index, final int length, final int host_class_index,
final ConstantPool constant_pool) {
super(Const.ATTR_NEST_MEMBERS, name_index, length, constant_pool);
this.host_class_index = host_class_index;
}
/**
* Constructs object from input stream.
* @param name_index Index in constant pool
* @param length Content length in bytes
* @param input Input stream
* @param constant_pool Array of constants
* @throws IOException
*/
NestHost(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException {
this(name_index, length, 0, constant_pool);
host_class_index = input.readUnsignedShort();
}
/**
* Called by objects that are traversing the nodes of the tree implicitely
* defined by the contents of a Java class. I.e., the hierarchy of methods,
* fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
@Override
public void accept( final Visitor v ) {
v.visitNestHost(this);
}
/**
* Dumps NestHost attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException if an I/O error occurs.
*/
@Override
public void dump( final DataOutputStream file ) throws IOException {
super.dump(file);
file.writeShort(host_class_index);
}
/**
* @return index into constant pool of host class name.
*/
public int getHostClassIndex() {
return host_class_index;
}
/**
* @param host_class_index the host class index
*/
public void setHostClassIndex( final int host_class_index ) {
this.host_class_index = host_class_index;
}
/**
* @return String representation
*/
@Override
public String toString() {
final StringBuilder buf = new StringBuilder();
buf.append("NestHost: ");
final String class_name = super.getConstantPool().getConstantString(host_class_index, Const.CONSTANT_Class);
buf.append(Utility.compactClassName(class_name, false));
return buf.toString();
}
/**
* @return deep copy of this attribute
*/
@Override
public Attribute copy( final ConstantPool _constant_pool ) {
final NestHost c = (NestHost) clone();
c.setConstantPool(_constant_pool);
return c;
}
}
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