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.property.basic;
25
26 import java.util.UUID;
27 import net.jcip.annotations.Immutable;
28 import org.modeshape.common.text.TextEncoder;
29 import org.modeshape.graph.property.Path;
30 import org.modeshape.graph.property.Reference;
31
32 /**
33 * A {@link Reference} implementation that uses a single {@link UUID} as the pointer.
34 */
35 @Immutable
36 public class StringReference implements Reference {
37
38 /**
39 */
40 private static final long serialVersionUID = 2299467578161645109L;
41 private/*final*/String id;
42 private/*final*/boolean isWeak;
43
44 public StringReference( String id ) {
45 this.id = id;
46 this.isWeak = false;
47 }
48
49 public StringReference( String id,
50 boolean weak ) {
51 this.id = id;
52 this.isWeak = weak;
53 }
54
55 /**
56 * {@inheritDoc}
57 *
58 * @see org.modeshape.graph.property.Reference#isWeak()
59 */
60 public boolean isWeak() {
61 return isWeak;
62 }
63
64 /**
65 * {@inheritDoc}
66 */
67 public String getString() {
68 return this.id;
69 }
70
71 /**
72 * {@inheritDoc}
73 */
74 public String getString( TextEncoder encoder ) {
75 if (encoder == null) encoder = Path.DEFAULT_ENCODER;
76 return encoder.encode(getString());
77 }
78
79 /**
80 * {@inheritDoc}
81 */
82 public int compareTo( Reference that ) {
83 if (this == that) return 0;
84 if (this.isWeak()) {
85 if (!that.isWeak()) return -1;
86 } else {
87 if (that.isWeak()) return 1;
88 }
89 if (that instanceof StringReference) {
90 return this.id.compareTo(((StringReference)that).getString());
91 }
92 return this.getString().compareTo(that.getString());
93 }
94
95 /**
96 * {@inheritDoc}
97 */
98 @Override
99 public boolean equals( Object obj ) {
100 if (obj == this) return true;
101 if (obj instanceof Reference) {
102 Reference that = (Reference)obj;
103 return this.isWeak() == that.isWeak() && this.getString().equals(that.getString());
104 }
105 return super.equals(obj);
106 }
107
108 /**
109 * {@inheritDoc}
110 */
111 @Override
112 public String toString() {
113 return this.id;
114 }
115
116 }