/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.clerezza.rdf.core.impl;
import org.apache.clerezza.rdf.core.NonLiteral;
import org.apache.clerezza.rdf.core.Resource;
import org.apache.clerezza.rdf.core.Triple;
import org.apache.clerezza.rdf.core.UriRef;
/**
*
* @author reto
*/
public class TripleImpl implements Triple {
private final NonLiteral subject;
private final UriRef predicate;
private final Resource object;
/**
* Creates a new <code>TripleImpl</code>.
*
* @param subject the subject.
* @param predicate the predicate.
* @param object the object.
* @throws IllegalArgumentException if an attribute is <code>null</code>.
*/
public TripleImpl(NonLiteral subject, UriRef predicate, Resource object) {
if (subject == null) {
throw new IllegalArgumentException("Invalid subject: null");
} else if (predicate == null) {
throw new IllegalArgumentException("Invalid predicate: null");
} else if (object == null) {
throw new IllegalArgumentException("Invalid object: null");
}
this.subject = subject;
this.predicate = predicate;
this.object = object;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (!(obj instanceof Triple)) {
return false;
}
final Triple other = (Triple) obj;
if (!this.subject.equals(other.getSubject())) {
return false;
}
if (!this.predicate.equals(other.getPredicate())) {
return false;
}
if (!this.object.equals(other.getObject())) {
return false;
}
return true;
}
@Override
public int hashCode() {
return (subject.hashCode() >> 1) ^ subject.hashCode() ^ (subject.hashCode() << 1);
}
@Override
public NonLiteral getSubject() {
return subject;
}
public UriRef getPredicate() {
return predicate;
}
public Resource getObject() {
return object;
}
@Override
public String toString() {
return subject + " " + predicate + " " + object + ".";
}
}