1 package org.drools.semantics.java;
2
3 /*
4 $Id: ExprCondition.java,v 1.9 2003/03/25 19:47:29 tdiesler 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.rule.Declaration;
50 import org.drools.smf.ConfigurableCondition;
51 import org.drools.smf.ConfigurationException;
52 import org.drools.spi.ConditionException;
53 import org.drools.spi.Tuple;
54
55 /*** Java expression semantics <code>Condition</code>.
56 *
57 * @author <a href="mailto:bob@werken.com">bob@werken.com</a>
58 *
59 * @version $Id: ExprCondition.java,v 1.9 2003/03/25 19:47:29 tdiesler Exp $
60 */
61 public class ExprCondition extends Expr implements ConfigurableCondition
62 {
63 // ------------------------------------------------------------
64 // Constructors
65 // ------------------------------------------------------------
66
67 /*** Construct, partially.
68 *
69 * @see Expr#configure
70 */
71 public ExprCondition()
72 {
73 // intentionally left blank.
74 }
75
76 /*** Construct.
77 *
78 * @param expr The expression.
79 * @param availDecls The available declarations.
80 *
81 * @throws ConfigurationException If an error occurs while
82 * attempting to perform configuration.
83 */
84 public ExprCondition(String expr,
85 Declaration[] availDecls) throws ConfigurationException
86 {
87 super( expr,
88 availDecls );
89 }
90
91 // ------------------------------------------------------------
92 // Instance methods
93 // ------------------------------------------------------------
94
95 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
96 // org.drools.spi.Condition
97 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
98
99 /*** Determine if the supplied <code>Tuple</code> is allowed
100 * by this condition.
101 *
102 * @param tuple The <code>Tuple</code> to test.
103 *
104 * @return <code>true</code> if the <code>Tuple</code>
105 * passes this condition, else <code>false</code>.
106 *
107 * @throws ConditionException if an error occurs during filtering.
108 */
109 public boolean isAllowed(Tuple tuple) throws ConditionException
110 {
111 try
112 {
113 Object result = evaluate( tuple );
114
115 if ( result instanceof Boolean )
116 {
117 return ((Boolean)result).booleanValue();
118 }
119 }
120 catch (Exception e)
121 {
122 throw new ConditionException( e );
123 }
124
125 throw new NonBooleanExprException( getExpression() );
126 }
127
128 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
129 // java.lang.Object
130 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
131
132 /*** Produce a debug string.
133 *
134 * @return The debug string.
135 */
136 public String toString()
137 {
138 return "[ExprCondition: expr=" + getExpression() + "]";
139 }
140 }
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