1 package org.drools.reteoo.impl;
2
3 /*
4 $Id: JoinNodeInput.java,v 1.5 2002/08/27 23:57:45 bob Exp $
5
6 Copyright 2002 (C) The Werken Company. All Rights Reserved.
7
8 Redistribution and use of this software and associated documentation
9 ("Software"), with or without modification, are permitted provided
10 that the following conditions are met:
11
12 1. Redistributions of source code must retain copyright
13 statements and notices. Redistributions must also contain a
14 copy of this document.
15
16 2. Redistributions in binary form must reproduce the
17 above copyright notice, this list of conditions and the
18 following disclaimer in the documentation and/or other
19 materials provided with the distribution.
20
21 3. The name "drools" must not be used to endorse or promote
22 products derived from this Software without prior written
23 permission of The Werken Company. For written permission,
24 please contact bob@werken.com.
25
26 4. Products derived from this Software may not be called "drools"
27 nor may "drools" appear in their names without prior written
28 permission of The Werken Company. "drools" is a registered
29 trademark of The Werken Company.
30
31 5. Due credit should be given to The Werken Company.
32 (http://drools.werken.com/).
33
34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS
35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
45 OF THE POSSIBILITY OF SUCH DAMAGE.
46
47 */
48
49 import org.drools.WorkingMemory;
50 import org.drools.AssertionException;
51 import org.drools.RetractionException;
52 import org.drools.FactException;
53
54 /*** Input <code>TupleSinkImpl</code> for a <code>JoinNodeImpl</code>.
55 *
56 * @see JoinNodeImpl
57 *
58 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
59 */
60 class JoinNodeInput implements TupleSinkImpl
61 {
62 // ------------------------------------------------------------
63 // Constants
64 // ------------------------------------------------------------
65
66 /*** Left-side input. */
67 static final int LEFT = 41;
68
69 /*** Right-side input. */
70 static final int RIGHT = 42;
71
72 // ------------------------------------------------------------
73 // Instance members
74 // ------------------------------------------------------------
75
76 /*** Join node. */
77 private JoinNodeImpl joinNode;
78
79 /*** Side. */
80 private int side;
81
82 // ------------------------------------------------------------
83 // Constructors
84 // ------------------------------------------------------------
85
86 /*** Construct.
87 *
88 * @param joinNode Join node.
89 * @param side Side marker.
90 */
91 JoinNodeInput(JoinNodeImpl joinNode,
92 int side)
93 {
94 this.joinNode = joinNode;
95 this.side = side;
96 }
97
98 // ------------------------------------------------------------
99 // Instance methods
100 // ------------------------------------------------------------
101
102 /*** Retrieve the side marker.
103 *
104 * @return The side marker.
105 */
106 int getSide()
107 {
108 return this.side;
109 }
110
111 /*** Retrieve the destination join node.
112 *
113 * @return The join node.
114 */
115 JoinNodeImpl getJoinNode()
116 {
117 return this.joinNode;
118 }
119
120 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
121 // org.drools.reteoo.impl.TupleSinkImpl
122 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
123
124 /*** Assert a new <code>Tuple</code>.
125 *
126 * @param tuple The <code>Tuple</code> being asserted.
127 * @param workingMemory The working memory seesion.
128 *
129 * @throws AssertionException If an error occurs while asserting.
130 */
131 public void assertTuple(ReteTuple tuple,
132 WorkingMemory workingMemory) throws AssertionException
133 {
134 if ( this.side == LEFT )
135 {
136 getJoinNode().assertLeftTuple( tuple,
137 workingMemory );
138 }
139 else
140 {
141 getJoinNode().assertRightTuple( tuple,
142 workingMemory );
143 }
144 }
145
146 /*** Retract tuples.
147 *
148 * @param key The tuple key.
149 * @param workingMemory The working memory seesion.
150 *
151 * @throws RetractionException If an error occurs while retracting.
152 */
153 public void retractTuples(TupleKey key,
154 WorkingMemory workingMemory) throws RetractionException
155 {
156 getJoinNode().retractTuples( key,
157 workingMemory );
158 }
159
160 /*** Modify tuples.
161 *
162 * @param trigger The root fact object.
163 * @param newTuples Modification replacement tuples.
164 * @param workingMemory The working memory session.
165 *
166 * @throws FactException If an error occurs while modifying.
167 */
168 public void modifyTuples(Object trigger,
169 TupleSet newTuples,
170 WorkingMemory workingMemory) throws FactException
171 {
172 if ( this.side == LEFT )
173 {
174 getJoinNode().modifyLeftTuples( trigger,
175 newTuples,
176 workingMemory );
177 }
178 else
179 {
180 getJoinNode().modifyRightTuples( trigger,
181 newTuples,
182 workingMemory );
183 }
184 }
185 }
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