/*
    * 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.ArrayList;
  import java.util.List;
  
  /**
   * Inner classes class file attribute
   */
  public class InnerClassesAttribute extends Attribute {
  
      private static final class InnerClassesEntry {
  
          CPClass innerClassInfo;
          CPClass outerClassInfo;
          CPUTF8 innerClassName;
  
          int innerClassInfoIndex = -1;
          int outerClassInfoIndex = -1;
          int innerNameIndex = -1;
          int innerClassAccessFlags = -1;
  
          InnerClassesEntry(final CPClass innerClass, final CPClass outerClass, final CPUTF8 innerName, final int flags) {
              this.innerClassInfo = innerClass;
              this.outerClassInfo = outerClass;
              this.innerClassName = innerName;
              this.innerClassAccessFlags = flags;
          }
  
          /**
           * Determine the indices of the things in the receiver which point to elements of the ClassConstantPool
           *
           * @param pool ClassConstantPool which holds the CPClass and CPUTF8 objects.
           */
          public void resolve(final ClassConstantPool pool) {
              if (innerClassInfo != null) {
                  innerClassInfo.resolve(pool);
                  innerClassInfoIndex = pool.indexOf(innerClassInfo);
              } else {
                  innerClassInfoIndex = 0;
              }
  
              if (innerClassName != null) {
                  innerClassName.resolve(pool);
                  innerNameIndex = pool.indexOf(innerClassName);
              } else {
                  innerNameIndex = 0;
              }
  
              if (outerClassInfo != null) {
                  outerClassInfo.resolve(pool);
                  outerClassInfoIndex = pool.indexOf(outerClassInfo);
              } else {
                  outerClassInfoIndex = 0;
              }
          }
  
          public void write(final DataOutputStream dos) throws IOException {
              dos.writeShort(innerClassInfoIndex);
              dos.writeShort(outerClassInfoIndex);
              dos.writeShort(innerNameIndex);
              dos.writeShort(innerClassAccessFlags);
          }
  
      }
  
      private static CPUTF8 attributeName;
  
      public static void setAttributeName(final CPUTF8 cpUTF8Value) {
          attributeName = cpUTF8Value;
      }
  
      private final List<InnerClassesEntry> innerClasses = new ArrayList<>();
      private final List<ConstantPoolEntry> nestedClassFileEntries = new ArrayList<>();
  
      public InnerClassesAttribute(final String name) {
          super(attributeName);
          nestedClassFileEntries.add(getAttributeName());
      }
  
     public void addInnerClassesEntry(final CPClass innerClass, final CPClass outerClass, final CPUTF8 innerName, final int flags) {
         if (innerClass != null) {
             nestedClassFileEntries.add(innerClass);
         }
         if (outerClass != null) {
             nestedClassFileEntries.add(outerClass);
         }
         if (innerName != null) {
             nestedClassFileEntries.add(innerName);
         }
         addInnerClassesEntry(new InnerClassesEntry(innerClass, outerClass, innerName, flags));
     }
 
     private void addInnerClassesEntry(final InnerClassesEntry innerClassesEntry) {
         innerClasses.add(innerClassesEntry);
     }
 
     @Override
     public boolean equals(final Object obj) {
         if (this == obj) {
             return true;
         }
         if (!super.equals(obj) || this.getClass() != obj.getClass()) {
             return false;
         }
         final InnerClassesAttribute other = (InnerClassesAttribute) obj;
         if (getAttributeName() == null) {
             if (other.getAttributeName() != null) {
                 return false;
             }
         } else if (!getAttributeName().equals(other.getAttributeName())) {
             return false;
         }
         return true;
     }
 
     @Override
     protected int getLength() {
         return 2 + (2 + 2 + 2 + 2) * innerClasses.size();
     }
 
     @Override
     protected ClassFileEntry[] getNestedClassFileEntries() {
         return nestedClassFileEntries.toArray(NONE);
     }
 
     @Override
     public int hashCode() {
         final int PRIME = 31;
         int result = super.hashCode();
         result = PRIME * result + (getAttributeName() == null ? 0 : getAttributeName().hashCode());
         return result;
     }
 
     @Override
     protected void resolve(final ClassConstantPool pool) {
         super.resolve(pool);
         for (final InnerClassesEntry entry : innerClasses) {
             entry.resolve(pool);
         }
     }
 
     @Override
     public String toString() {
         return "InnerClasses: " + getAttributeName();
     }
 
     @Override
     protected void writeBody(final DataOutputStream dos) throws IOException {
         dos.writeShort(innerClasses.size());
 
         for (final InnerClassesEntry entry : innerClasses) {
             entry.write(dos);
         }
     }
 }