001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one or more
003 *  contributor license agreements.  See the NOTICE file distributed with
004 *  this work for additional information regarding copyright ownership.
005 *  The ASF licenses this file to You under the Apache License, Version 2.0
006 *  (the "License"); you may not use this file except in compliance with
007 *  the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 */
017package org.apache.commons.compress.harmony.unpack200.bytecode;
018
019import java.io.DataOutputStream;
020import java.io.IOException;
021
022/**
023 * ClassFile is used to represent and write out Java class files.
024 */
025public class ClassFile {
026
027    public int major;
028    public int minor;
029    private final int magic = 0xCAFEBABE;
030    public ClassConstantPool pool = new ClassConstantPool();
031    public int accessFlags;
032    public int thisClass;
033    public int superClass;
034    public int[] interfaces;
035    public ClassFileEntry[] fields;
036    public ClassFileEntry[] methods;
037    public Attribute[] attributes;
038
039    public void write(final DataOutputStream dos) throws IOException {
040        dos.writeInt(magic);
041        dos.writeShort(minor);
042        dos.writeShort(major);
043        dos.writeShort(pool.size() + 1);
044        for (int i = 1; i <= pool.size(); i++) {
045            ConstantPoolEntry entry;
046            (entry = (ConstantPoolEntry) pool.get(i)).doWrite(dos);
047            // Doubles and longs take up two spaces in the pool, but only one
048            // gets written
049            if (entry.getTag() == ConstantPoolEntry.CP_Double || entry.getTag() == ConstantPoolEntry.CP_Long) {
050                i++;
051            }
052        }
053        dos.writeShort(accessFlags);
054        dos.writeShort(thisClass);
055        dos.writeShort(superClass);
056        dos.writeShort(interfaces.length);
057        for (int i = 0; i < interfaces.length; i++) {
058            dos.writeShort(interfaces[i]);
059        }
060        dos.writeShort(fields.length);
061        for (int i = 0; i < fields.length; i++) {
062            fields[i].write(dos);
063        }
064        dos.writeShort(methods.length);
065        for (int i = 0; i < methods.length; i++) {
066            methods[i].write(dos);
067        }
068        dos.writeShort(attributes.length);
069        for (int i = 0; i < attributes.length; i++) {
070            attributes[i].write(dos);
071        }
072    }
073}