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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
JavaExprAnalyzer.java | 100% | 100% | 100% | 100% |
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1 | package org.drools.semantics.java; | |
2 | ||
3 | /* | |
4 | * $Id: JavaExprAnalyzer.java,v 1.2 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 java.io.StringReader; | |
45 | import java.util.ArrayList; | |
46 | import java.util.HashSet; | |
47 | import java.util.Iterator; | |
48 | import java.util.List; | |
49 | import java.util.Set; | |
50 | ||
51 | import org.drools.rule.Declaration; | |
52 | import org.drools.semantics.java.parser.JavaLexer; | |
53 | import org.drools.semantics.java.parser.JavaRecognizer; | |
54 | import org.drools.semantics.java.parser.JavaTreeParser; | |
55 | ||
56 | import antlr.RecognitionException; | |
57 | import antlr.TokenStreamException; | |
58 | import antlr.collections.AST; | |
59 | /** | |
60 | * Expression analyzer. | |
61 | * | |
62 | * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter </a> | |
63 | */ | |
64 | public class JavaExprAnalyzer | |
65 | { | |
66 | // ------------------------------------------------------------ | |
67 | // Constructors | |
68 | // ------------------------------------------------------------ | |
69 | ||
70 | /** | |
71 | * Construct. | |
72 | */ | |
73 | 126 | public JavaExprAnalyzer() |
74 | { | |
75 | // intentionally left blank. | |
76 | } | |
77 | ||
78 | // ------------------------------------------------------------ | |
79 | // Instance methods | |
80 | // ------------------------------------------------------------ | |
81 | ||
82 | /** | |
83 | * Analyze an expression. | |
84 | * | |
85 | * @param expr The expression to analyze. | |
86 | * @param availDecls Total set of declarations available. | |
87 | * | |
88 | * @return The <code>Set</code> of declarations used by the expression. | |
89 | * | |
90 | * @throws TokenStreamException If an error occurs in the lexer. | |
91 | * @throws RecognitionException If an error occurs in the parser. | |
92 | * @throws MissingDeclarationException If the expression requires a | |
93 | * declaration not present in the available declarations. | |
94 | */ | |
95 | 126 | public List analyze( String expr, |
96 | List availDecls ) | |
97 | throws TokenStreamException, RecognitionException, MissingDeclarationException | |
98 | { | |
99 | 126 | JavaLexer lexer = new JavaLexer( new StringReader( expr ) ); |
100 | 126 | JavaRecognizer parser = new JavaRecognizer( lexer ); |
101 | ||
102 | 126 | parser.ruleCondition( ); |
103 | ||
104 | 126 | AST ast = parser.getAST( ); |
105 | ||
106 | 126 | return analyze( availDecls, ast ); |
107 | } | |
108 | ||
109 | /** | |
110 | * Analyze an expression. | |
111 | * | |
112 | * @param availDecls Total set of declarations available. | |
113 | * @param ast The AST for the expression. | |
114 | * | |
115 | * @return The <code>Set</code> of declarations used by the expression. | |
116 | * | |
117 | * @throws RecognitionException If an error occurs in the parser. | |
118 | */ | |
119 | 126 | private List analyze( List availDecls, |
120 | AST ast ) throws RecognitionException | |
121 | { | |
122 | 126 | JavaTreeParser treeParser = new JavaTreeParser( ); |
123 | ||
124 | 126 | treeParser.init( ); |
125 | ||
126 | 126 | treeParser.exprCondition( ast ); |
127 | ||
128 | 126 | Set refs = new HashSet( treeParser.getVariableReferences( ) ); |
129 | ||
130 | 126 | List decls = new ArrayList( ); |
131 | ||
132 | 126 | Iterator declIter = availDecls.iterator( ); |
133 | 126 | Declaration eachDecl; |
134 | ||
135 | 126 | while ( declIter.hasNext( ) ) |
136 | { | |
137 | 285 | eachDecl = ( Declaration ) declIter.next( ); |
138 | ||
139 | 285 | if ( refs.contains( eachDecl.getIdentifier( ) ) ) |
140 | { | |
141 | 203 | decls.add( eachDecl ); |
142 | 203 | refs.remove( eachDecl.getIdentifier( ) ); |
143 | } | |
144 | } | |
145 | ||
146 | /* | |
147 | * if ( ! refs.isEmpty() ) { throw new MissingDeclarationException( | |
148 | * expr, (String) refs.iterator().next() ); } | |
149 | */ | |
150 | 126 | return decls; |
151 | } | |
152 | } |
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