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* DO NOT REMOVE OR ALTER!
*/
/*
* 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.
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package com.sun.org.apache.bcel.internal.classfile;
import com.sun.org.apache.bcel.internal.Constants;
import java.io.*;
/**
* This class represents a stack map attribute used for
* preverification of Java classes for the Java 2 Micro Edition
* (J2ME). This attribute is used by the KVM and contained
* within the Code attribute of a method. See CLDC specification
* 5.3.1.2
*
* @author M. Dahm
* @see Code
* @see StackMapEntry
* @see StackMapType
*/
public final class StackMap extends Attribute implements Node {
private int map_length;
private StackMapEntry[] map; // Table of stack map entries
/*
* @param name_index Index of name
* @param length Content length in bytes
* @param map Table of stack map entries
* @param constant_pool Array of constants
*/
public StackMap(int name_index, int length, StackMapEntry[] map,
ConstantPool constant_pool)
{
super(Constants.ATTR_STACK_MAP, name_index, length, constant_pool);
setStackMap(map);
}
/**
* Construct object from file stream.
* @param name_index Index of name
* @param length Content length in bytes
* @param file Input stream
* @throws IOException
* @param constant_pool Array of constants
*/
StackMap(int name_index, int length, DataInputStream file,
ConstantPool constant_pool) throws IOException
{
this(name_index, length, (StackMapEntry[])null, constant_pool);
map_length = file.readUnsignedShort();
map = new StackMapEntry[map_length];
for(int i=0; i < map_length; i++)
map[i] = new StackMapEntry(file, constant_pool);
}
/**
* Dump line number table attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
public final void dump(DataOutputStream file) throws IOException
{
super.dump(file);
file.writeShort(map_length);
for(int i=0; i < map_length; i++)
map[i].dump(file);
}
/**
* @return Array of stack map entries
*/
public final StackMapEntry[] getStackMap() { return map; }
/**
* @param map Array of stack map entries
*/
public final void setStackMap(StackMapEntry[] map) {
this.map = map;
map_length = (map == null)? 0 : map.length;
}
/**
* @return String representation.
*/
public final String toString() {
StringBuffer buf = new StringBuffer("StackMap(");
for(int i=0; i < map_length; i++) {
buf.append(map[i].toString());
if(i < map_length - 1)
buf.append(", ");
}
buf.append(')');
return buf.toString();
}
/**
* @return deep copy of this attribute
*/
public Attribute copy(ConstantPool constant_pool) {
StackMap c = (StackMap)clone();
c.map = new StackMapEntry[map_length];
for(int i=0; i < map_length; i++)
c.map[i] = map[i].copy();
c.constant_pool = constant_pool;
return c;
}
/**
* 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
*/
public void accept(Visitor v) {
v.visitStackMap(this);
}
public final int getMapLength() { return map_length; }
}