/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
package com.sun.org.apache.bcel.internal.generic;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.io.*;
import com.sun.org.apache.bcel.internal.util.ByteSequence;
/**
* LDC - Push item from constant pool.
*
* <PRE>Stack: ... -> ..., item</PRE>
*
* @version $Id: LDC.java,v 1.1.2.1 2005/07/31 23:45:08 jeffsuttor Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public class LDC extends CPInstruction
implements PushInstruction, ExceptionThrower, TypedInstruction {
/**
* Empty constructor needed for the Class.newInstance() statement in
* Instruction.readInstruction(). Not to be used otherwise.
*/
LDC() {}
public LDC(int index) {
super(com.sun.org.apache.bcel.internal.Constants.LDC_W, index);
setSize();
}
// Adjust to proper size
protected final void setSize() {
if(index <= com.sun.org.apache.bcel.internal.Constants.MAX_BYTE) { // Fits in one byte?
opcode = com.sun.org.apache.bcel.internal.Constants.LDC;
length = 2;
} else {
opcode = com.sun.org.apache.bcel.internal.Constants.LDC_W;
length = 3;
}
}
/**
* Dump instruction as byte code to stream out.
* @param out Output stream
*/
public void dump(DataOutputStream out) throws IOException {
out.writeByte(opcode);
if(length == 2)
out.writeByte(index);
else // Applies for LDC_W
out.writeShort(index);
}
/**
* Set the index to constant pool and adjust size.
*/
public final void setIndex(int index) {
super.setIndex(index);
setSize();
}
/**
* Read needed data (e.g. index) from file.
*/
protected void initFromFile(ByteSequence bytes, boolean wide)
throws IOException
{
length = 2;
index = bytes.readUnsignedByte();
}
public Object getValue(ConstantPoolGen cpg) {
com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(index);
switch(c.getTag()) {
case com.sun.org.apache.bcel.internal.Constants.CONSTANT_String:
int i = ((com.sun.org.apache.bcel.internal.classfile.ConstantString)c).getStringIndex();
c = cpg.getConstantPool().getConstant(i);
return ((com.sun.org.apache.bcel.internal.classfile.ConstantUtf8)c).getBytes();
case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Float:
return new Float(((com.sun.org.apache.bcel.internal.classfile.ConstantFloat)c).getBytes());
case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Integer:
return new Integer(((com.sun.org.apache.bcel.internal.classfile.ConstantInteger)c).getBytes());
default: // Never reached
throw new RuntimeException("Unknown or invalid constant type at " + index);
}
}
public Type getType(ConstantPoolGen cpg) {
switch(cpg.getConstantPool().getConstant(index).getTag()) {
case com.sun.org.apache.bcel.internal.Constants.CONSTANT_String: return Type.STRING;
case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Float: return Type.FLOAT;
case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Integer: return Type.INT;
default: // Never reached
throw new RuntimeException("Unknown or invalid constant type at " + index);
}
}
public Class[] getExceptions() {
return com.sun.org.apache.bcel.internal.ExceptionConstants.EXCS_STRING_RESOLUTION;
}
/**
* Call corresponding visitor method(s). The order is:
* Call visitor methods of implemented interfaces first, then
* call methods according to the class hierarchy in descending order,
* i.e., the most specific visitXXX() call comes last.
*
* @param v Visitor object
*/
public void accept(Visitor v) {
v.visitStackProducer(this);
v.visitPushInstruction(this);
v.visitExceptionThrower(this);
v.visitTypedInstruction(this);
v.visitCPInstruction(this);
v.visitLDC(this);
}
}