1 package org.drools.reteoo.impl;
2
3 /*
4 $Id: TerminalNodeImpl.java,v 1.3 2002/08/10 19:16:17 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.reteoo.TerminalNode;
52 import org.drools.reteoo.TupleSource;
53 import org.drools.rule.Rule;
54
55 /*** Leaf Rete-OO node responsible for enacting <code>Action</code>s
56 * on a matched <code>Rule</code>.
57 *
58 * @see org.drools.rule.Rule
59 * @see org.drools.spi.Action
60 *
61 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
62 */
63 public class TerminalNodeImpl implements TerminalNode, TupleSinkImpl
64 {
65 // ------------------------------------------------------------
66 // Instance members
67 // ------------------------------------------------------------
68
69 /*** Total-ordering priority of this terminal node for rule-firings. */
70 private int priority;
71
72 /*** The rule to invoke upon match. */
73 private Rule rule;
74
75 // ------------------------------------------------------------
76 // Constructors
77 // ------------------------------------------------------------
78
79 /*** Construct.
80 *
81 * @param inputSource The parent tuple source.
82 * @param rule The rule.
83 * @param priority The priority.
84 */
85 public TerminalNodeImpl(TupleSource inputSource,
86 Rule rule,
87 int priority)
88 {
89 this.rule = rule;
90
91 this.priority = priority;
92
93 if ( inputSource != null )
94 {
95 ((TupleSourceImpl)inputSource).setTupleSink( this );
96 }
97 }
98
99 // ------------------------------------------------------------
100 // Instance methods
101 // ------------------------------------------------------------
102
103 /*** Retrieve the priority
104 *
105 * @return The priority.
106 */
107 public int getPriority()
108 {
109 return this.priority;
110 }
111
112 /*** Retrieve the <code>Action</code> associated with
113 * this node.
114 *
115 * @return The <code>Action</code> associated with
116 * this node.
117 */
118 public Rule getRule()
119 {
120 return this.rule;
121 }
122
123 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
124 // org.drools.impl.TupleSink
125 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
126
127 /*** Assert a new <code>Tuple</code>.
128 *
129 * @param tuple The <code>Tuple</code> being asserted.
130 * @param workingMemory The working memory seesion.
131 *
132 * @throws AssertionException If an error occurs while asserting.
133 */
134 public void assertTuple(ReteTuple tuple,
135 WorkingMemory workingMemory) throws AssertionException
136 {
137 AgendaImpl agenda = (AgendaImpl) workingMemory.getAgenda();
138
139 agenda.addToAgenda( tuple,
140 getRule(),
141 getPriority() );
142 }
143
144 /*** Retract tuples.
145 *
146 * @param key The tuple key.
147 * @param workingMemory The working memory seesion.
148 */
149 public void retractTuples(TupleKey key,
150 WorkingMemory workingMemory)
151 {
152 AgendaImpl agenda = (AgendaImpl) workingMemory.getAgenda();
153
154 agenda.removeFromAgenda( key,
155 getRule() );
156 }
157
158 /*** Modify tuples.
159 *
160 * @param trigger The root fact object.
161 * @param newTuples Modification replacement tuples.
162 * @param workingMemory The working memory session.
163 */
164 public void modifyTuples(Object trigger,
165 TupleSet newTuples,
166 WorkingMemory workingMemory)
167 {
168 AgendaImpl agenda = (AgendaImpl) workingMemory.getAgenda();
169
170 agenda.modifyAgenda( trigger,
171 newTuples,
172 getRule(),
173 getPriority() );
174 }
175 }
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