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 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.commons.rdf.simple;
19
20 import org.apache.commons.rdf.api.BlankNodeOrIRI;
21 import org.apache.commons.rdf.api.IRI;
22 import org.apache.commons.rdf.api.RDFTerm;
23 import org.apache.commons.rdf.api.Triple;
24
25 import java.util.Objects;
26
27 /**
28 * A simple implementation of Triple.
29 */
30 final class TripleImpl implements Triple {
31
32 private final BlankNodeOrIRI subject;
33 private final IRI predicate;
34 private final RDFTerm object;
35
36 /**
37 * Construct Triple from its constituent parts.
38 * <p>
39 * The objects are not changed. All mapping of BNode objects is done in
40 * {@link SimpleRDF#createTriple(BlankNodeOrIRI, IRI, RDFTerm)}.
41 *
42 * @param subject
43 * subject of triple
44 * @param predicate
45 * predicate of triple
46 * @param object
47 * object of triple
48 */
49 public TripleImpl(final BlankNodeOrIRI subject, final IRI predicate, final RDFTerm object) {
50 this.subject = Objects.requireNonNull(subject);
51 this.predicate = Objects.requireNonNull(predicate);
52 this.object = Objects.requireNonNull(object);
53 }
54
55 @Override
56 public BlankNodeOrIRI getSubject() {
57 return subject;
58 }
59
60 @Override
61 public IRI getPredicate() {
62 return predicate;
63 }
64
65 @Override
66 public RDFTerm getObject() {
67 return object;
68 }
69
70 @Override
71 public String toString() {
72 return getSubject().ntriplesString() + " " + getPredicate().ntriplesString() + " "
73 + getObject().ntriplesString() + " .";
74 }
75
76 @Override
77 public int hashCode() {
78 return Objects.hash(subject, predicate, object);
79 }
80
81 @Override
82 public boolean equals(final Object obj) {
83 if (!(obj instanceof Triple)) {
84 return false;
85 }
86 final Triple other = (Triple) obj;
87 return getSubject().equals(other.getSubject()) && getPredicate().equals(other.getPredicate())
88 && getObject().equals(other.getObject());
89 }
90
91 }