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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   https://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
20  
21  import org.apache.commons.compress.harmony.pack200.Pack200Exception;
22  import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
23  import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
24  import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
25  import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
26  
27  /**
28   * Abstract superclass of those classes which look up init methods (these are class specific methods). They use getInitMethodPoolEntry to find the methods.
29   */
30  public abstract class InitMethodReferenceForm extends ClassSpecificReferenceForm {
31  
32      /**
33       * Constructs a new instance with the specified opcode, name, operandType and rewrite.
34       *
35       * @param opcode  index corresponding to the opcode's value.
36       * @param name    String printable name of the opcode.
37       * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
38       */
39      public InitMethodReferenceForm(final int opcode, final String name, final int[] rewrite) {
40          super(opcode, name, rewrite);
41      }
42  
43      @Override
44      protected abstract String context(OperandManager operandManager);
45  
46      @Override
47      protected int getOffset(final OperandManager operandManager) {
48          return operandManager.nextInitRef();
49      }
50  
51      @Override
52      protected int getPoolID() {
53          return SegmentConstantPool.CP_METHOD;
54      }
55  
56      @Override
57      protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
58          final SegmentConstantPool globalPool = operandManager.globalConstantPool();
59          final ClassFileEntry[] nested = { globalPool.getInitMethodPoolEntry(SegmentConstantPool.CP_METHOD, offset, context(operandManager)) };
60          byteCode.setNested(nested);
61          byteCode.setNestedPositions(new int[][] { { 0, 2 } });
62      }
63  }