1 /*
2 * ModeShape (http://www.modeshape.org)
3 * See the COPYRIGHT.txt file distributed with this work for information
4 * regarding copyright ownership. Some portions may be licensed
5 * to Red Hat, Inc. under one or more contributor license agreements.
6 * See the AUTHORS.txt file in the distribution for a full listing of
7 * individual contributors.
8 *
9 * ModeShape is free software. Unless otherwise indicated, all code in ModeShape
10 * is licensed to you under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation; either version 2.1 of
12 * the License, or (at your option) any later version.
13 *
14 * ModeShape is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this software; if not, write to the Free
21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
23 */
24 package org.modeshape.graph.query.model;
25
26 import net.jcip.annotations.Immutable;
27 import org.modeshape.common.util.CheckArg;
28
29 /**
30 * A literal value used in a {@link Comparison} constraint.
31 */
32 @Immutable
33 public class Literal extends StaticOperand {
34 private static final long serialVersionUID = 1L;
35
36 private final Object value;
37
38 public Literal( Object value ) {
39 CheckArg.isNotNull(value, "value");
40 this.value = value;
41 }
42
43 /**
44 * @return value
45 */
46 public final Object getValue() {
47 return value;
48 }
49
50 /**
51 * {@inheritDoc}
52 *
53 * @see java.lang.Object#toString()
54 */
55 @Override
56 public String toString() {
57 return Visitors.readable(this);
58 }
59
60 /**
61 * {@inheritDoc}
62 *
63 * @see java.lang.Object#hashCode()
64 */
65 @Override
66 public int hashCode() {
67 return getValue().hashCode();
68 }
69
70 /**
71 * {@inheritDoc}
72 *
73 * @see java.lang.Object#equals(java.lang.Object)
74 */
75 @Override
76 public boolean equals( Object obj ) {
77 if (obj == this) return true;
78 if (obj instanceof Literal) {
79 Literal that = (Literal)obj;
80 return this.value.equals(that.value) || this.value.toString().equals(that.value.toString());
81 }
82 return false;
83 }
84
85 /**
86 * {@inheritDoc}
87 *
88 * @see org.modeshape.graph.query.model.Visitable#accept(org.modeshape.graph.query.model.Visitor)
89 */
90 public void accept( Visitor visitor ) {
91 visitor.visit(this);
92 }
93 }