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/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
package com.sun.org.apache.bcel.internal.classfile;
/* ====================================================================
* 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.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* 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 com.sun.org.apache.bcel.internal.Constants;
import java.io.*;
/**
* This class represents the type of a local variable or item on stack
* used in the StackMap entries.
*
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
* @see StackMapEntry
* @see StackMap
* @see Constants
*/
public final class StackMapType implements Cloneable {
private byte type;
private int index = -1; // Index to CONSTANT_Class or offset
private ConstantPool constant_pool;
/**
* Construct object from file stream.
* @param file Input stream
* @throws IOException
*/
StackMapType(DataInputStream file, ConstantPool constant_pool) throws IOException
{
this(file.readByte(), -1, constant_pool);
if(hasIndex())
setIndex(file.readShort());
setConstantPool(constant_pool);
}
/**
* @param type type tag as defined in the Constants interface
* @param index index to constant pool, or byte code offset
*/
public StackMapType(byte type, int index, ConstantPool constant_pool) {
setType(type);
setIndex(index);
setConstantPool(constant_pool);
}
public void setType(byte t) {
if((t < Constants.ITEM_Bogus) || (t > Constants.ITEM_NewObject))
throw new RuntimeException("Illegal type for StackMapType: " + t);
type = t;
}
public byte getType() { return type; }
public void setIndex(int t) { index = t; }
/** @return index to constant pool if type == ITEM_Object, or offset
* in byte code, if type == ITEM_NewObject, and -1 otherwise
*/
public int getIndex() { return index; }
/**
* Dump type entries to file.
*
* @param file Output file stream
* @throws IOException
*/
public final void dump(DataOutputStream file) throws IOException
{
file.writeByte(type);
if(hasIndex())
file.writeShort(getIndex());
}
/** @return true, if type is either ITEM_Object or ITEM_NewObject
*/
public final boolean hasIndex() {
return ((type == Constants.ITEM_Object) ||
(type == Constants.ITEM_NewObject));
}
private String printIndex() {
if(type == Constants.ITEM_Object)
return ", class=" + constant_pool.constantToString(index, Constants.CONSTANT_Class);
else if(type == Constants.ITEM_NewObject)
return ", offset=" + index;
else
return "";
}
/**
* @return String representation
*/
public final String toString() {
return "(type=" + Constants.ITEM_NAMES[type] + printIndex() + ")";
}
/**
* @return deep copy of this object
*/
public StackMapType copy() {
try {
return (StackMapType)clone();
} catch(CloneNotSupportedException e) {}
return null;
}
/**
* @return Constant pool used by this object.
*/
public final ConstantPool getConstantPool() { return constant_pool; }
/**
* @param constant_pool Constant pool to be used for this object.
*/
public final void setConstantPool(ConstantPool constant_pool) {
this.constant_pool = constant_pool;
}
}
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