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    private static final int MAGIC = 0xCAFEBABE;
028
029    public int major;
030    public int minor;
031    public ClassConstantPool pool = new ClassConstantPool();
032    public int accessFlags;
033    public int thisClass;
034    public int superClass;
035    public int[] interfaces;
036    public ClassFileEntry[] fields;
037    public ClassFileEntry[] methods;
038    public Attribute[] attributes;
039
040    public void write(final DataOutputStream dos) throws IOException {
041        dos.writeInt(MAGIC);
042        dos.writeShort(minor);
043        dos.writeShort(major);
044        dos.writeShort(pool.size() + 1);
045        for (int i = 1; i <= pool.size(); i++) {
046            ConstantPoolEntry entry;
047            (entry = (ConstantPoolEntry) pool.get(i)).doWrite(dos);
048            // Doubles and longs take up two spaces in the pool, but only one
049            // gets written
050            if (entry.getTag() == ConstantPoolEntry.CP_Double || entry.getTag() == ConstantPoolEntry.CP_Long) {
051                i++;
052            }
053        }
054        dos.writeShort(accessFlags);
055        dos.writeShort(thisClass);
056        dos.writeShort(superClass);
057        dos.writeShort(interfaces.length);
058        for (final int element : interfaces) {
059            dos.writeShort(element);
060        }
061        dos.writeShort(fields.length);
062        for (final ClassFileEntry field : fields) {
063            field.write(dos);
064        }
065        dos.writeShort(methods.length);
066        for (final ClassFileEntry method : methods) {
067            method.write(dos);
068        }
069        dos.writeShort(attributes.length);
070        for (final Attribute attribute : attributes) {
071            attribute.write(dos);
072        }
073    }
074}