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