|
|||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
GroovyCondition.java | 25% | 64% | 63.6% | 56.8% |
|
1 | package org.drools.semantics.groovy; | |
2 | ||
3 | /* | |
4 | * $Id: GroovyCondition.java,v 1.5 2005/02/04 02:13:38 mproctor 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 that the | |
10 | * following conditions are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain copyright statements and | |
13 | * notices. Redistributions must also contain a copy of this document. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
16 | * this list of conditions and the following disclaimer in the documentation | |
17 | * and/or other materials provided with the distribution. | |
18 | * | |
19 | * 3. The name "drools" must not be used to endorse or promote products derived | |
20 | * from this Software without prior written permission of The Werken Company. | |
21 | * For written permission, please contact bob@werken.com. | |
22 | * | |
23 | * 4. Products derived from this Software may not be called "drools" nor may | |
24 | * "drools" appear in their names without prior written permission of The Werken | |
25 | * Company. "drools" is a registered trademark of The Werken Company. | |
26 | * | |
27 | * 5. Due credit should be given to The Werken Company. | |
28 | * (http://drools.werken.com/). | |
29 | * | |
30 | * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS'' | |
31 | * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
32 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
33 | * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE | |
34 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
35 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
36 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
39 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
40 | * POSSIBILITY OF SUCH DAMAGE. | |
41 | * | |
42 | */ | |
43 | ||
44 | import groovy.lang.Binding; | |
45 | ||
46 | import java.util.Iterator; | |
47 | import java.util.NoSuchElementException; | |
48 | ||
49 | import org.drools.rule.Declaration; | |
50 | import org.drools.rule.Rule; | |
51 | import org.drools.spi.Condition; | |
52 | import org.drools.spi.ConditionException; | |
53 | import org.drools.spi.Tuple; | |
54 | ||
55 | /** | |
56 | * Groovy expression semantics <code>Condition</code>. | |
57 | * | |
58 | * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter </a> | |
59 | * @author <a href="mailto:james@coredevelopers.net">James Strachan </a> | |
60 | */ | |
61 | public class GroovyCondition extends GroovyInterp implements Condition | |
62 | { | |
63 | // ------------------------------------------------------------ | |
64 | // Instance members | |
65 | // ------------------------------------------------------------ | |
66 | ||
67 | /** Required declarations. */ | |
68 | private Declaration[] requiredDeclarations; | |
69 | ||
70 | // ------------------------------------------------------------ | |
71 | // Constructors | |
72 | // ------------------------------------------------------------ | |
73 | ||
74 | /** | |
75 | * Construct. | |
76 | */ | |
77 | 21 | public GroovyCondition( String text, |
78 | Rule rule ) throws Exception | |
79 | { | |
80 | 21 | super( text, |
81 | rule ); | |
82 | ||
83 | 21 | GroovyExprAnalyzer analyzer = new GroovyExprAnalyzer( ); |
84 | ||
85 | 21 | this.requiredDeclarations = analyzer.analyze( getText( ), |
86 | rule.getParameterDeclarations( ) ); | |
87 | } | |
88 | ||
89 | // ------------------------------------------------------------ | |
90 | // Instance methods | |
91 | // ------------------------------------------------------------ | |
92 | ||
93 | /** | |
94 | * Evaluate. | |
95 | * | |
96 | * @param tuple Tuple containing variable bindings. | |
97 | * @return The result of evaluation. | |
98 | */ | |
99 | 21 | public Object evaluate( Tuple tuple ) |
100 | { | |
101 | 21 | Binding dict = setUpDictionary( tuple, declarationIterator( ) ); |
102 | ||
103 | 21 | return evaluate( dict ); |
104 | } | |
105 | ||
106 | /** | |
107 | * Evaluate. | |
108 | * | |
109 | * @param locals The evaluation dictionary. | |
110 | * @return The result of evaluation. | |
111 | */ | |
112 | 21 | protected Object evaluate( Binding locals ) |
113 | { | |
114 | //ScriptContext globals = new ScriptContext(); | |
115 | 21 | getCode( ).setBinding( locals ); |
116 | 21 | return getCode( ).run( ); |
117 | } | |
118 | ||
119 | /** | |
120 | * Retrieve the array of <code>Declaration</code> s required by this condition to perform its duties. | |
121 | * | |
122 | * @return The array of <code>Declarations</code> expected on incoming <code>Tuples</code>. | |
123 | */ | |
124 | 0 | public Declaration[] getRequiredTupleMembers() |
125 | { | |
126 | 0 | return this.requiredDeclarations; |
127 | } | |
128 | ||
129 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
130 | // org.drools.spi.Condition | |
131 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
132 | ||
133 | /** | |
134 | * Determine if the supplied <code>Tuple</code> is allowed by this | |
135 | * condition. | |
136 | * | |
137 | * @param tuple The <code>Tuple</code> to test. | |
138 | * | |
139 | * @return <code>true</code> if the <code>Tuple</code> passes this | |
140 | * condition, else <code>false</code>. | |
141 | * | |
142 | * @throws ConditionException if an error occurs during filtering. | |
143 | */ | |
144 | 21 | public boolean isAllowed( Tuple tuple ) throws ConditionException |
145 | { | |
146 | 21 | try |
147 | { | |
148 | 21 | Object answer = evaluate( tuple ); |
149 | ||
150 | 20 | if ( !( answer instanceof Boolean ) ) |
151 | { | |
152 | 0 | throw new NonBooleanExprException( getText( ) ); |
153 | } | |
154 | ||
155 | 20 | return ( ( Boolean ) answer ).booleanValue( ); |
156 | } | |
157 | catch ( RuntimeException e ) | |
158 | { | |
159 | 1 | throw new ConditionException( e, |
160 | getRule( ), | |
161 | getText( ) ); | |
162 | } | |
163 | } | |
164 | ||
165 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
166 | ||
167 | 0 | public int hashCode() |
168 | { | |
169 | 0 | return this.getText( ).hashCode( ); |
170 | } | |
171 | ||
172 | 0 | public boolean equals( Object object ) |
173 | { | |
174 | 0 | if ( this == object ) |
175 | { | |
176 | 0 | return true; |
177 | } | |
178 | ||
179 | 0 | if ( object == null || getClass( ) != object.getClass( ) ) |
180 | { | |
181 | 0 | return false; |
182 | } | |
183 | ||
184 | 0 | return this.getText().equals( ( ( GroovyInterp ) object ).getText( ) ); |
185 | } | |
186 | ||
187 | /** | |
188 | * GroovyInterp needs a declaration iterator. | |
189 | * BlockConsequence uses the Iterator from Set. | |
190 | * So we emulate Iterator here so GroovyInterp can be used for both. | |
191 | * @return | |
192 | */ | |
193 | 21 | public Iterator declarationIterator( ) |
194 | { | |
195 | 21 | return new Iterator() |
196 | { | |
197 | private int index=0; | |
198 | ||
199 | 0 | public void remove() |
200 | { | |
201 | //null; | |
202 | } | |
203 | ||
204 | 59 | public boolean hasNext() |
205 | { | |
206 | 59 | return (index < requiredDeclarations.length); |
207 | } | |
208 | ||
209 | 19 | public Object next() |
210 | { | |
211 | 19 | if ( !hasNext( ) ) |
212 | { | |
213 | 0 | throw new NoSuchElementException( ); |
214 | } | |
215 | 19 | return requiredDeclarations[this.index++]; |
216 | } | |
217 | ||
218 | }; | |
219 | } | |
220 | } |
|