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1   /*
2    * Copyright (c) 2007, James Leigh All rights reserved.
3    * 
4    * Redistribution and use in source and binary forms, with or without
5    * modification, are permitted provided that the following conditions are met:
6    * 
7    * - Redistributions of source code must retain the above copyright notice, this
8    *   list of conditions and the following disclaimer.
9    * - Redistributions in binary form must reproduce the above copyright notice,
10   *   this list of conditions and the following disclaimer in the documentation
11   *   and/or other materials provided with the distribution. 
12   * - Neither the name of the openrdf.org nor the names of its contributors may
13   *   be used to endorse or promote products derived from this software without
14   *   specific prior written permission.
15   * 
16   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26   * POSSIBILITY OF SUCH DAMAGE.
27   * 
28   */
29  package org.openrdf.elmo.sesame;
30  
31  import info.aduna.iteration.CloseableIteration;
32  
33  import org.openrdf.elmo.exceptions.ElmoPersistException;
34  import org.openrdf.elmo.sesame.helpers.PropertyChanger;
35  import org.openrdf.elmo.sesame.roles.SesameEntity;
36  import org.openrdf.model.Resource;
37  import org.openrdf.model.Statement;
38  import org.openrdf.model.Value;
39  import org.openrdf.repository.RepositoryException;
40  import org.openrdf.repository.contextaware.ContextAwareConnection;
41  
42  /**
43   * A set for a given getResource(), predicate.
44   * 
45   * @author James Leigh
46   * 
47   * @param <E>
48   */
49  public class InverseSesameProperty<E> extends SesameProperty<E> {
50  
51  	public InverseSesameProperty(SesameEntity bean, PropertyChanger property) {
52  		super(bean, property);
53  	}
54  
55  	@Override
56  	public boolean add(Object o) {
57  		Value val = getValue(o);
58  		if (contains(val))
59  			return false;
60  		ContextAwareConnection conn = getConnection();
61  		try {
62  			add(conn, (Resource) val, getResource());
63  		} catch (RepositoryException e) {
64  			throw new ElmoPersistException(e);
65  		}
66  		return true;
67  	}
68  
69  	@Override
70  	public boolean remove(Object o) {
71  		Value val = getValue(o);
72  		if (!contains(val))
73  			return false;
74  		ContextAwareConnection conn = getConnection();
75  		try {
76  			remove(conn, (Resource) val, getResource());
77  		} catch (RepositoryException e) {
78  			throw new ElmoPersistException(e);
79  		}
80  		return true;
81  	}
82  
83  	@Override
84  	public boolean contains(Object o) {
85  		Value val = getValue(o);
86  		ContextAwareConnection conn = getConnection();
87  		try {
88  			return conn.hasStatement((Resource) val, getURI(), getResource());
89  		} catch (RepositoryException e) {
90  			throw new ElmoPersistException(e);
91  		}
92  	}
93  
94  	@Override
95  	@SuppressWarnings("unchecked")
96  	E createInstance(Statement stmt) {
97  		Value value = stmt.getSubject();
98  		return (E) getManager().getInstance(value);
99  	}
100 
101 	@Override
102 	CloseableIteration<? extends Statement, RepositoryException> getStatements()
103 			throws RepositoryException {
104 		ContextAwareConnection conn = getConnection();
105 		return conn.getStatements(null, getURI(), getResource());
106 	}
107 
108 }