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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
JavaCondition.java | 50% | 75% | 85.7% | 73% |
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1 | package org.drools.semantics.java; | |
2 | ||
3 | /* | |
4 | * $Id: JavaCondition.java,v 1.11.2.2 2005/05/08 00:57:36 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 java.io.Serializable; | |
45 | import java.util.List; | |
46 | import java.util.Map; | |
47 | ||
48 | import javax.naming.ConfigurationException; | |
49 | ||
50 | import org.codehaus.janino.Scanner; | |
51 | import org.drools.rule.Declaration; | |
52 | import org.drools.rule.Rule; | |
53 | import org.drools.spi.Condition; | |
54 | import org.drools.spi.ConditionException; | |
55 | import org.drools.spi.DefaultKnowledgeHelper; | |
56 | import org.drools.spi.KnowledgeHelper; | |
57 | import org.drools.spi.Tuple; | |
58 | ||
59 | /** | |
60 | * Java expression semantics <code>Condition</code>. | |
61 | * | |
62 | * @author <a href="mailto:bob@werken.com">bob@werken.com </a> | |
63 | */ | |
64 | public class JavaCondition | |
65 | implements | |
66 | Serializable, | |
67 | Condition | |
68 | { | |
69 | // ------------------------------------------------------------ | |
70 | // Instance members | |
71 | // ------------------------------------------------------------ | |
72 | ||
73 | private final String originalExpression; | |
74 | ||
75 | private final Rule rule; | |
76 | ||
77 | private final String expression; | |
78 | ||
79 | private final Declaration[] requiredDeclarations; | |
80 | ||
81 | private final String className; | |
82 | ||
83 | private transient Script script; | |
84 | ||
85 | // ------------------------------------------------------------ | |
86 | // Constructors | |
87 | // ------------------------------------------------------------ | |
88 | ||
89 | /** | |
90 | * Construct. | |
91 | * | |
92 | * @param expression | |
93 | * The expression. | |
94 | * @param rule | |
95 | * The rule. | |
96 | * @throws ConfigurationException | |
97 | * If an error occurs while attempting to perform configuration. | |
98 | */ | |
99 | 126 | protected JavaCondition(Rule rule, |
100 | int id, | |
101 | String expression) throws Exception | |
102 | { | |
103 | 126 | this.originalExpression = expression; |
104 | 126 | this.expression = "return (" + expression + ");"; |
105 | 126 | this.rule = rule; |
106 | ||
107 | 126 | JavaExprAnalyzer analyzer = new JavaExprAnalyzer( ); |
108 | 126 | List requiredDecls = analyzer.analyze( expression, |
109 | rule.getParameterDeclarations( ) ); | |
110 | ||
111 | 126 | this.requiredDeclarations = (Declaration[]) requiredDecls.toArray( new Declaration[requiredDecls.size( )] ); |
112 | ||
113 | 126 | this.className = "Condition_" + id; |
114 | 126 | this.script = compile( ); |
115 | } | |
116 | ||
117 | // ------------------------------------------------------------ | |
118 | // Instance methods | |
119 | // ------------------------------------------------------------ | |
120 | ||
121 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
122 | // org.drools.spi.Condition | |
123 | // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | |
124 | ||
125 | /** | |
126 | * Determine if the supplied <code>Tuple</code> is allowed by this | |
127 | * condition. | |
128 | * | |
129 | * @param tuple | |
130 | * The <code>Tuple</code> to test. | |
131 | * | |
132 | * @return <code>true</code> if the <code>Tuple</code> passes this | |
133 | * condition, else <code>false</code>. | |
134 | * | |
135 | * @throws ConditionException | |
136 | * if an error occurs during filtering. | |
137 | */ | |
138 | 39253 | public boolean isAllowed(Tuple tuple) throws ConditionException |
139 | { | |
140 | 39253 | try |
141 | { | |
142 | 39253 | if ( this.script == null ) |
143 | { | |
144 | 0 | this.script = compile( ); |
145 | } | |
146 | 39253 | return this.script.invoke( tuple, |
147 | requiredDeclarations, | |
148 | new DefaultKnowledgeHelper( rule, | |
149 | tuple ), | |
150 | tuple.getWorkingMemory( ).getApplicationDataMap( ) ); | |
151 | } | |
152 | catch ( Scanner.LocatedException e ) | |
153 | { | |
154 | 0 | throw new ConditionException( e, |
155 | this.rule, | |
156 | this.originalExpression ); | |
157 | } | |
158 | catch ( CompilationException e ) | |
159 | { | |
160 | 0 | throw new ConditionException( e.getMessage( ), |
161 | e.getRule( ), | |
162 | e.getText( ) ); | |
163 | } | |
164 | catch ( Exception e ) | |
165 | { | |
166 | 1 | throw new ConditionException( e, |
167 | this.rule, | |
168 | this.originalExpression ); | |
169 | } | |
170 | } | |
171 | ||
172 | /** | |
173 | * Retrieve the <code>Declaration</code> s required for evaluating the | |
174 | * expression. | |
175 | * | |
176 | * @return The required declarations. | |
177 | */ | |
178 | 319 | public Declaration[] getRequiredTupleMembers() |
179 | { | |
180 | 319 | return this.requiredDeclarations; |
181 | } | |
182 | ||
183 | 126 | private Script compile() throws Exception |
184 | { | |
185 | 126 | return (Script) JavaCompiler.compile( this.rule, |
186 | this.className, | |
187 | Script.class, | |
188 | this.expression, | |
189 | this.originalExpression, | |
190 | this.requiredDeclarations ); | |
191 | } | |
192 | ||
193 | // ------------------------------------------------------------ | |
194 | ||
195 | 3818 | public int hashCode() |
196 | { | |
197 | 3818 | return this.originalExpression.hashCode( ); |
198 | } | |
199 | ||
200 | 16 | public boolean equals(Object object) |
201 | { | |
202 | 16 | if ( this == object ) |
203 | { | |
204 | 0 | return true; |
205 | } | |
206 | ||
207 | 16 | if ( object == null || getClass( ) != object.getClass( ) ) |
208 | { | |
209 | 0 | return false; |
210 | } | |
211 | ||
212 | 16 | return this.originalExpression.equals( ((JavaCondition) object).originalExpression ); |
213 | } | |
214 | ||
215 | 0 | public String toString() |
216 | { | |
217 | 0 | return "[Condition: " + this.originalExpression + "]"; |
218 | } | |
219 | ||
220 | public static interface Script | |
221 | { | |
222 | public boolean invoke(Tuple tuple, | |
223 | Declaration[] decls, | |
224 | KnowledgeHelper drools, | |
225 | Map applicationData) throws Exception; | |
226 | } | |
227 | } |
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