001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.commons.compress.harmony.unpack200.bytecode;
020
021import java.io.DataOutputStream;
022import java.io.IOException;
023
024/**
025 * ClassFile is used to represent and write out Java class files.
026 */
027public class ClassFile {
028
029    private static final int MAGIC = 0xCAFEBABE;
030
031    public int major;
032    public int minor;
033    public ClassConstantPool pool = new ClassConstantPool();
034    public int accessFlags;
035    public int thisClass;
036    public int superClass;
037    public int[] interfaces;
038    public ClassFileEntry[] fields;
039    public ClassFileEntry[] methods;
040    public Attribute[] attributes;
041
042    public void write(final DataOutputStream dos) throws IOException {
043        dos.writeInt(MAGIC);
044        dos.writeShort(minor);
045        dos.writeShort(major);
046        dos.writeShort(pool.size() + 1);
047        for (int i = 1; i <= pool.size(); i++) {
048            final ConstantPoolEntry entry;
049            (entry = (ConstantPoolEntry) pool.get(i)).doWrite(dos);
050            // Doubles and longs take up two spaces in the pool, but only one
051            // gets written
052            if (entry.getTag() == ConstantPoolEntry.CP_Double || entry.getTag() == ConstantPoolEntry.CP_Long) {
053                i++;
054            }
055        }
056        dos.writeShort(accessFlags);
057        dos.writeShort(thisClass);
058        dos.writeShort(superClass);
059        dos.writeShort(interfaces.length);
060        for (final int element : interfaces) {
061            dos.writeShort(element);
062        }
063        dos.writeShort(fields.length);
064        for (final ClassFileEntry field : fields) {
065            field.write(dos);
066        }
067        dos.writeShort(methods.length);
068        for (final ClassFileEntry method : methods) {
069            method.write(dos);
070        }
071        dos.writeShort(attributes.length);
072        for (final Attribute attribute : attributes) {
073            attribute.write(dos);
074        }
075    }
076}