View Javadoc
1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
18  
19  import org.apache.commons.compress.harmony.pack200.Pack200Exception;
20  import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
21  import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
22  import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
23  import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
24  
25  /**
26   * This class implements the byte code form for those bytecodes which have string references (and only string references).
27   */
28  public class StringRefForm extends SingleByteReferenceForm {
29  
30      public StringRefForm(final int opcode, final String name, final int[] rewrite) {
31          super(opcode, name, rewrite);
32      }
33  
34      public StringRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
35          this(opcode, name, rewrite);
36          this.widened = widened;
37      }
38  
39      @Override
40      protected int getOffset(final OperandManager operandManager) {
41          return operandManager.nextStringRef();
42      }
43  
44      @Override
45      protected int getPoolID() {
46          return SegmentConstantPool.CP_STRING;
47      }
48  
49      @Override
50      protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
51          final SegmentConstantPool globalPool = operandManager.globalConstantPool();
52          final ClassFileEntry[] nested = { globalPool.getValue(getPoolID(), offset) };
53          byteCode.setNested(nested);
54          if (widened) {
55              byteCode.setNestedPositions(new int[][] { { 0, 2 } });
56          } else {
57              byteCode.setNestedPositions(new int[][] { { 0, 1 } });
58          }
59      }
60  }