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   */
18  package org.apache.bcel.generic;
19  
20  import java.io.DataOutputStream;
21  import java.io.IOException;
22  
23  import org.apache.bcel.classfile.ConstantUtf8;
24  import org.apache.bcel.classfile.ElementValue;
25  import org.apache.bcel.classfile.EnumElementValue;
26  
27  /**
28   * @since 6.0
29   */
30  public class EnumElementValueGen extends ElementValueGen
31  {
32      // For enum types, these two indices point to the type and value
33      private int typeIdx;
34  
35      private int valueIdx;
36  
37      /**
38       * This ctor assumes the constant pool already contains the right type and
39       * value - as indicated by typeIdx and valueIdx. This ctor is used for
40       * deserialization
41       */
42      protected EnumElementValueGen(final int typeIdx, final int valueIdx,
43              final ConstantPoolGen cpool)
44      {
45          super(ElementValueGen.ENUM_CONSTANT, cpool);
46          if (super.getElementValueType() != ENUM_CONSTANT) {
47              throw new RuntimeException(
48                      "Only element values of type enum can be built with this ctor - type specified: " + super.getElementValueType());
49          }
50          this.typeIdx = typeIdx;
51          this.valueIdx = valueIdx;
52      }
53  
54      /**
55       * Return immutable variant of this EnumElementValue
56       */
57      @Override
58      public ElementValue getElementValue()
59      {
60          System.err.println("Duplicating value: " + getEnumTypeString() + ":"
61                  + getEnumValueString());
62          return new EnumElementValue(super.getElementValueType(), typeIdx, valueIdx,
63                  getConstantPool().getConstantPool());
64      }
65  
66      public EnumElementValueGen(final ObjectType t, final String value, final ConstantPoolGen cpool)
67      {
68          super(ElementValueGen.ENUM_CONSTANT, cpool);
69          typeIdx = cpool.addUtf8(t.getSignature());// was addClass(t);
70          valueIdx = cpool.addUtf8(value);// was addString(value);
71      }
72  
73      public EnumElementValueGen(final EnumElementValue value, final ConstantPoolGen cpool,
74              final boolean copyPoolEntries)
75      {
76          super(ENUM_CONSTANT, cpool);
77          if (copyPoolEntries)
78          {
79              typeIdx = cpool.addUtf8(value.getEnumTypeString());// was
80                                                                  // addClass(value.getEnumTypeString());
81              valueIdx = cpool.addUtf8(value.getEnumValueString()); // was
82                                                                      // addString(value.getEnumValueString());
83          }
84          else
85          {
86              typeIdx = value.getTypeIndex();
87              valueIdx = value.getValueIndex();
88          }
89      }
90  
91      @Override
92      public void dump(final DataOutputStream dos) throws IOException
93      {
94          dos.writeByte(super.getElementValueType()); // u1 type of value (ENUM_CONSTANT == 'e')
95          dos.writeShort(typeIdx); // u2
96          dos.writeShort(valueIdx); // u2
97      }
98  
99      @Override
100     public String stringifyValue()
101     {
102         final ConstantUtf8 cu8 = (ConstantUtf8) getConstantPool().getConstant(valueIdx);
103         return cu8.getBytes();
104         // ConstantString cu8 =
105         // (ConstantString)getConstantPool().getConstant(valueIdx);
106         // return
107         // ((ConstantUtf8)getConstantPool().getConstant(cu8.getStringIndex())).getBytes();
108     }
109 
110     // BCELBUG: Should we need to call utility.signatureToString() on the output
111     // here?
112     public String getEnumTypeString()
113     {
114         // Constant cc = getConstantPool().getConstant(typeIdx);
115         // ConstantClass cu8 =
116         // (ConstantClass)getConstantPool().getConstant(typeIdx);
117         // return
118         // ((ConstantUtf8)getConstantPool().getConstant(cu8.getNameIndex())).getBytes();
119         return ((ConstantUtf8) getConstantPool().getConstant(typeIdx))
120                 .getBytes();
121         // return Utility.signatureToString(cu8.getBytes());
122     }
123 
124     public String getEnumValueString()
125     {
126         return ((ConstantUtf8) getConstantPool().getConstant(valueIdx)).getBytes();
127         // ConstantString cu8 =
128         // (ConstantString)getConstantPool().getConstant(valueIdx);
129         // return
130         // ((ConstantUtf8)getConstantPool().getConstant(cu8.getStringIndex())).getBytes();
131     }
132 
133     public int getValueIndex()
134     {
135         return valueIdx;
136     }
137 
138     public int getTypeIndex()
139     {
140         return typeIdx;
141     }
142 }