/*
    * 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.Collections;
  import java.util.List;
  import java.util.Objects;
  
  /**
   * Superclass for member constant pool entries, such as fields or methods.
   */
  public class CPMember extends ClassFileEntry {
  
      List<Attribute> attributes;
      short flags;
      CPUTF8 name;
      transient int nameIndex;
      protected final CPUTF8 descriptor;
      transient int descriptorIndex;
  
      /**
       * Constructs a new CPMember.
       *
       * @param name       TODO
       * @param descriptor TODO
       * @param flags      TODO
       * @param attributes TODO
       * @throws NullPointerException if name or descriptor is null
       */
      public CPMember(final CPUTF8 name, final CPUTF8 descriptor, final long flags, final List<Attribute> attributes) {
          this.name = Objects.requireNonNull(name, "name");
          this.descriptor = Objects.requireNonNull(descriptor, "descriptor");
          this.flags = (short) flags;
          this.attributes = attributes == null ? Collections.EMPTY_LIST : attributes;
      }
  
      @Override
      protected void doWrite(final DataOutputStream dos) throws IOException {
          dos.writeShort(flags);
          dos.writeShort(nameIndex);
          dos.writeShort(descriptorIndex);
          final int attributeCount = attributes.size();
          dos.writeShort(attributeCount);
          for (int i = 0; i < attributeCount; i++) {
              final Attribute attribute = attributes.get(i);
              attribute.doWrite(dos);
          }
      }
  
      @Override
      public boolean equals(final Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null || getClass() != obj.getClass()) {
              return false;
          }
          final CPMember other = (CPMember) obj;
          return Objects.equals(attributes, other.attributes)
                  && Objects.equals(descriptor, other.descriptor)
                  && flags == other.flags
                  && Objects.equals(name, other.name);
      }
  
      @Override
      protected ClassFileEntry[] getNestedClassFileEntries() {
          final int attributeCount = attributes.size();
          final ClassFileEntry[] entries = new ClassFileEntry[attributeCount + 2];
          entries[0] = name;
          entries[1] = descriptor;
          for (int i = 0; i < attributeCount; i++) {
              entries[i + 2] = attributes.get(i);
          }
          return entries;
      }
  
      @Override
      public int hashCode() {
          final int PRIME = 31;
          int result = 1;
          result = PRIME * result + attributes.hashCode();
         result = PRIME * result + descriptor.hashCode();
         result = PRIME * result + flags;
         result = PRIME * result + name.hashCode();
         return result;
     }
 
     @Override
     protected void resolve(final ClassConstantPool pool) {
         super.resolve(pool);
         nameIndex = pool.indexOf(name);
         descriptorIndex = pool.indexOf(descriptor);
         attributes.forEach(attribute -> attribute.resolve(pool));
     }
 
     @Override
     public String toString() {
         return "CPMember: " + name + "(" + descriptor + ")";
     }
 
 }