/*
    * 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
    *
   *   https://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.commons.compress.harmony.unpack200.bytecode;
  
  import java.io.DataOutputStream;
  import java.io.IOException;
  
  /**
   * ClassFile is used to represent and write out Java class files.
   */
  public class ClassFile {
  
      private static final int MAGIC = 0xCAFEBABE;
  
      public int major;
      public int minor;
      public ClassConstantPool pool = new ClassConstantPool();
      public int accessFlags;
      public int thisClass;
      public int superClass;
      public int[] interfaces;
      public ClassFileEntry[] fields;
      public ClassFileEntry[] methods;
      public Attribute[] attributes;
  
      public void write(final DataOutputStream dos) throws IOException {
          dos.writeInt(MAGIC);
          dos.writeShort(minor);
          dos.writeShort(major);
          dos.writeShort(pool.size() + 1);
          for (int i = 1; i <= pool.size(); i++) {
              final ConstantPoolEntry entry;
              (entry = (ConstantPoolEntry) pool.get(i)).doWrite(dos);
              // Doubles and longs take up two spaces in the pool, but only one
              // gets written
              if (entry.getTag() == ConstantPoolEntry.CP_Double || entry.getTag() == ConstantPoolEntry.CP_Long) {
                  i++;
              }
          }
          dos.writeShort(accessFlags);
          dos.writeShort(thisClass);
          dos.writeShort(superClass);
          dos.writeShort(interfaces.length);
          for (final int element : interfaces) {
              dos.writeShort(element);
          }
          dos.writeShort(fields.length);
          for (final ClassFileEntry field : fields) {
              field.write(dos);
          }
          dos.writeShort(methods.length);
          for (final ClassFileEntry method : methods) {
              method.write(dos);
          }
          dos.writeShort(attributes.length);
          for (final Attribute attribute : attributes) {
              attribute.write(dos);
          }
      }
  }