/*
    *  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
    *
    *     http://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.forms;
  
  import org.apache.commons.compress.harmony.pack200.Pack200Exception;
  import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
  import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
  import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
  import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
  
  /**
   * This class implements the byte code form for those bytecodes which have class references (and only class references).
   */
  public class ClassRefForm extends ReferenceForm {
  
      protected boolean widened;
  
      public ClassRefForm(final int opcode, final String name, final int[] rewrite) {
          super(opcode, name, rewrite);
      }
  
      public ClassRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
          this(opcode, name, rewrite);
          this.widened = widened;
      }
  
      @Override
      protected int getOffset(final OperandManager operandManager) {
          return operandManager.nextClassRef();
      }
  
      @Override
      protected int getPoolID() {
          return SegmentConstantPool.CP_CLASS;
      }
  
      @Override
      protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
          // If the offset is not zero, proceed normally.
          if (offset != 0) {
              super.setNestedEntries(byteCode, operandManager, offset - 1);
              return;
          }
          // If the offset is 0, ClassRefForms refer to
          // the current class. Add that as the nested class.
          // (This is true for all bc_classref forms in
          // the spec except for multianewarray, which has
          // its own form.)
          final SegmentConstantPool globalPool = operandManager.globalConstantPool();
          // How do I get this class?
          final ClassFileEntry[] nested = { globalPool.getClassPoolEntry(operandManager.getCurrentClass()) };
          byteCode.setNested(nested);
          byteCode.setNestedPositions(new int[][] { { 0, 2 } });
      }
  }