/*
    * 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;
  import java.util.Objects;
  
  /**
   * Constant pool entry for a class
   */
  public class CPClass extends ConstantPoolEntry {
  
      private int index;
  
      public String name;
  
      private final CPUTF8 utf8;
  
      private boolean hashCodeComputed;
  
      private int cachedHashCode;
  
      /**
       * Creates a new CPClass
       *
       * @param name        TODO
       * @param globalIndex index in CpBands
       * @throws NullPointerException if name is null
       */
      public CPClass(final CPUTF8 name, final int globalIndex) {
          super(CP_Class, globalIndex);
          this.name = Objects.requireNonNull(name, "name").underlyingString();
          this.utf8 = name;
      }
  
      @Override
      public boolean equals(final Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null || this.getClass() != obj.getClass()) {
              return false;
          }
          final CPClass other = (CPClass) obj;
          return utf8.equals(other.utf8);
      }
  
      private void generateHashCode() {
          hashCodeComputed = true;
          cachedHashCode = utf8.hashCode();
      }
  
      public String getName() {
          return name;
      }
  
      @Override
      protected ClassFileEntry[] getNestedClassFileEntries() {
          return new ClassFileEntry[] { utf8, };
      }
  
      @Override
      public int hashCode() {
          if (!hashCodeComputed) {
              generateHashCode();
          }
          return cachedHashCode;
      }
  
      @Override
      protected void resolve(final ClassConstantPool pool) {
          super.resolve(pool);
          index = pool.indexOf(utf8);
      }
  
      @Override
      public String toString() {
          return "Class: " + getName();
      }
  
      @Override
      protected void writeBody(final DataOutputStream dos) throws IOException {
         dos.writeShort(index);
     }
 }