1 package org.drools.semantics.python;
2
3 /*
4 $Id: ExprCondition.java,v 1.3 2003/03/25 19:47:32 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.smf.ConfigurableCondition;
50 import org.drools.spi.ConditionException;
51 import org.drools.spi.Tuple;
52 import org.python.core.PyException;
53
54 /*** Python expression semantics <code>Condition</code>.
55 *
56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
57 *
58 * @version $Id: ExprCondition.java,v 1.3 2003/03/25 19:47:32 tdiesler Exp $
59 */
60 public class ExprCondition extends Eval implements ConfigurableCondition
61 {
62 // ------------------------------------------------------------
63 // Constructors
64 // ------------------------------------------------------------
65
66 /*** Construct.
67 *
68 * @param expr The expression.
69 */
70 public ExprCondition(String expr)
71 {
72 setExpression( expr );
73 }
74
75 /*** Construct, partially.
76 */
77 public ExprCondition()
78 {
79 // intentionally left blank.
80 }
81
82 // ------------------------------------------------------------
83 // Instance methods
84 // ------------------------------------------------------------
85
86 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
87 // org.drools.spi.Condition
88 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
89
90 /*** Determine if the supplied <code>Tuple</code> is allowed
91 * by this condition.
92 *
93 * @param tuple The <code>Tuple</code> to test.
94 *
95 * @return <code>true</code> if the <code>Tuple</code>
96 * passes this condition, else <code>false</code>.
97 *
98 * @throws ConditionException if an error occurs during filtering.
99 */
100 public boolean isAllowed(Tuple tuple) throws ConditionException
101 {
102 try
103 {
104 Object answer = evaluate( tuple );
105
106 if ( ! ( answer instanceof Number ) )
107 {
108 throw new NonBooleanExprException( getExpression() );
109 }
110
111 return ( ( ((Number)answer).intValue() == 0 )
112 ? false
113 : true
114 );
115 }
116 catch (PyException e)
117 {
118 throw new ConditionException( e );
119 }
120 }
121
122 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
123 // java.lang.String
124 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
125
126 /*** Produce a debug string.
127 *
128 * @return The debug string.
129 */
130 public String toString()
131 {
132 return "[ExprCondition: expr=" + getExpression() + "]";
133 }
134 }
This page was automatically generated by Maven