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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.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.Const;
/**
* This class represents the type of a local variable or item on stack
* used in the StackMap entries.
*
* @version $Id$
* @see StackMapEntry
* @see StackMap
* @see Const
*/
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(final DataInput file, final ConstantPool constant_pool) throws IOException {
this(file.readByte(), -1, constant_pool);
if (hasIndex()) {
this.index = file.readShort();
}
this.constant_pool = constant_pool;
}
/**
* @param type type tag as defined in the Constants interface
* @param index index to constant pool, or byte code offset
*/
public StackMapType(final byte type, final int index, final ConstantPool constant_pool) {
if ((type < Const.ITEM_Bogus) || (type > Const.ITEM_NewObject)) {
throw new RuntimeException("Illegal type for StackMapType: " + type);
}
this.type = type;
this.index = index;
this.constant_pool = constant_pool;
}
public void setType( final byte t ) {
if ((t < Const.ITEM_Bogus) || (t > Const.ITEM_NewObject)) {
throw new RuntimeException("Illegal type for StackMapType: " + t);
}
type = t;
}
public byte getType() {
return type;
}
public void setIndex( final 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( final 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 == Const.ITEM_Object || type == Const.ITEM_NewObject;
}
private String printIndex() {
if (type == Const.ITEM_Object) {
if (index < 0) {
return ", class=<unknown>";
}
return ", class=" + constant_pool.constantToString(index, Const.CONSTANT_Class);
} else if (type == Const.ITEM_NewObject) {
return ", offset=" + index;
} else {
return "";
}
}
/**
* @return String representation
*/
@Override
public final String toString() {
return "(type=" + Const.getItemName(type) + printIndex() + ")";
}
/**
* @return deep copy of this object
*/
public StackMapType copy() {
try {
return (StackMapType) clone();
} catch (final CloneNotSupportedException e) {
// TODO should this throw?
}
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( final ConstantPool constant_pool ) {
this.constant_pool = constant_pool;
}
}
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