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/*
* 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.generic;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.classfile.Constant;
import org.apache.bcel.classfile.ConstantClass;
import org.apache.bcel.classfile.ConstantPool;
import org.apache.bcel.util.ByteSequence;
/**
* Abstract super class for instructions that use an index into the
* constant pool such as LDC, INVOKEVIRTUAL, etc.
*
* @see ConstantPoolGen
* @see LDC
* @see INVOKEVIRTUAL
*
* @version $Id$
*/
public abstract class CPInstruction extends Instruction implements TypedInstruction,
IndexedInstruction {
/**
* @deprecated (since 6.0) will be made private; do not access directly, use getter/setter
*/
@Deprecated
protected int index; // index to constant pool
/**
* Empty constructor needed for Instruction.readInstruction.
* Not to be used otherwise.
*/
CPInstruction() {
}
/**
* @param index to constant pool
*/
protected CPInstruction(final short opcode, final int index) {
super(opcode, (short) 3);
setIndex(index);
}
/**
* Dump instruction as byte code to stream out.
* @param out Output stream
*/
@Override
public void dump( final DataOutputStream out ) throws IOException {
out.writeByte(super.getOpcode());
out.writeShort(index);
}
/**
* Long output format:
*
* <name of opcode> "["<opcode number>"]"
* "("<length of instruction>")" "<"< constant pool index>">"
*
* @param verbose long/short format switch
* @return mnemonic for instruction
*/
@Override
public String toString( final boolean verbose ) {
return super.toString(verbose) + " " + index;
}
/**
* @return mnemonic for instruction with symbolic references resolved
*/
@Override
public String toString( final ConstantPool cp ) {
final Constant c = cp.getConstant(index);
String str = cp.constantToString(c);
if (c instanceof ConstantClass) {
str = str.replace('.', '/');
}
return org.apache.bcel.Const.getOpcodeName(super.getOpcode()) + " " + str;
}
/**
* Read needed data (i.e., index) from file.
* @param bytes input stream
* @param wide wide prefix?
*/
@Override
protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
setIndex(bytes.readUnsignedShort());
super.setLength(3);
}
/**
* @return index in constant pool referred by this instruction.
*/
@Override
public final int getIndex() {
return index;
}
/**
* Set the index to constant pool.
* @param index in constant pool.
*/
@Override
public void setIndex( final int index ) { // TODO could be package-protected?
if (index < 0) {
throw new ClassGenException("Negative index value: " + index);
}
this.index = index;
}
/** @return type related with this instruction.
*/
@Override
public Type getType( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
String name = cp.getConstantString(index, org.apache.bcel.Const.CONSTANT_Class);
if (!name.startsWith("[")) {
name = "L" + name + ";";
}
return Type.getType(name);
}
}
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