1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.db.impl.graph;
14 import org.simantics.db.Resource;
15 import org.simantics.db.Statement;
16 import org.simantics.db.impl.ResourceImpl;
17 import org.simantics.db.impl.support.ResourceSupport;
19 public final class InternalStatement implements Statement, Comparable<Statement> {
21 final ResourceSupport support;
26 public InternalStatement(ResourceSupport support, final int s, final int p, final int o) {
27 this.support = support;
34 public Resource getSubject() {
35 return new ResourceImpl(support, s);
39 public Resource getPredicate() {
40 return new ResourceImpl(support, p);
44 public Resource getObject() {
45 return new ResourceImpl(support, o);
49 public boolean isAsserted(Resource subject) {
50 return ((ResourceImpl)subject).id != s;
54 final public int hashCode() {
55 return 41 * ( 31 * s + p) + o;
58 final private int id(Resource r) {
59 return ((ResourceImpl)r).id;
63 public boolean equals(Object object) {
66 else if (object == null)
68 else if (!(object instanceof Statement))
70 Statement r = (Statement)object;
71 return s == id(r.getSubject()) && p == id(r.getPredicate()) && o== id(r.getObject());
75 public int compareTo(Statement other) {
76 int result = compare(s,id(other.getSubject()));
77 if(result != 0) return result;
78 result = compare(p,id(other.getPredicate()));
79 if(result != 0) return result;
80 return compare(o,id(other.getObject()));
83 private int compare(int x, int y) {
84 return (x < y) ? -1 : ((x == y) ? 0 : 1);