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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;
20  
21  import java.util.Objects;
22  
23  /**
24   * Abstract superclass for constant pool constant entries such as numbers or Strings
25   */
26  public abstract class CPConstant extends ConstantPoolEntry {
27  
28      private final Object value;
29  
30      /**
31       * Constructs a new CPConstant.
32       *
33       * @param tag         TODO
34       * @param value       TODO
35       * @param globalIndex index in CpBands
36       * @throws NullPointerException if value is null
37       */
38      public CPConstant(final byte tag, final Object value, final int globalIndex) {
39          super(tag, globalIndex);
40          this.value = Objects.requireNonNull(value, "value");
41      }
42  
43      @Override
44      public boolean equals(final Object obj) {
45          if (this == obj) {
46              return true;
47          }
48          if (obj == null || this.getClass() != obj.getClass()) {
49              return false;
50          }
51          final CPConstant other = (CPConstant) obj;
52          return Objects.equals(value, other.value);
53      }
54  
55      /**
56       * Gets the value.
57       *
58       * @return the value.
59       */
60      protected Object getValue() {
61          return value;
62      }
63  
64      @Override
65      public int hashCode() {
66          return Objects.hash(value);
67      }
68  }