org.apache.tomcat.util.bcel.classfile.StackMapTable Maven / Gradle / Ivy
/*
* 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.tomcat.util.bcel.classfile;
import java.io.DataInputStream;
import java.io.IOException;
/**
* 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
*
* @version $Id: StackMapTable.java 1397988 2012-10-14 01:00:48Z markt $
* @author M. Dahm
* @see Code
* @see StackMapEntry
* @see StackMapType
*/
public final class StackMapTable extends Attribute {
private static final long serialVersionUID = -2931695092763099621L;
private int map_length;
private StackMapTableEntry[] 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 StackMapTable(int name_index, int length, StackMapTableEntry[] map, ConstantPool constant_pool) {
super(name_index, length, constant_pool);
setStackMapTable(map);
}
/**
* Construct object from file stream.
* @param name_index Index of name
* @param length Content length in bytes
* @param file Input stream
* @param constant_pool Array of constants
* @throws IOException
*/
StackMapTable(int name_index, int length, DataInputStream file, ConstantPool constant_pool)
throws IOException {
this(name_index, length, (StackMapTableEntry[]) null, constant_pool);
map_length = file.readUnsignedShort();
map = new StackMapTableEntry[map_length];
for (int i = 0; i < map_length; i++) {
map[i] = new StackMapTableEntry(file);
}
}
/**
* @param map Array of stack map entries
*/
public final void setStackMapTable( StackMapTableEntry[] map ) {
this.map = map;
map_length = (map == null) ? 0 : map.length;
}
}