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1 package org.drools.semantics.python; 2 3 /* 4 $Id: Interp.java,v 1.5 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.rule.Declaration; 50 import org.drools.spi.ObjectType; 51 import org.drools.spi.Tuple; 52 import org.python.core.*; 53 import org.python.parser.ast.modType; 54 import org.python.util.PythonInterpreter; 55 56 import java.util.Hashtable; 57 import java.util.Iterator; 58 import java.util.Set; 59 60 /*** Base class for Jython interpreter-based Python semantic components. 61 * 62 * @see Eval 63 * @see Exec 64 * 65 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 66 * 67 * @version $Id: Interp.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $ 68 */ 69 public class Interp 70 { 71 // ------------------------------------------------------------ 72 // Class Initialization 73 // ------------------------------------------------------------ 74 75 /*** Ensure jpython gets initialized. 76 */ 77 static 78 { 79 // throw it away. we only need it for setting up 80 // system state. 81 new PythonInterpreter(); 82 } 83 84 // ------------------------------------------------------------ 85 // Instance members 86 // ------------------------------------------------------------ 87 88 /*** Interp. */ 89 // private PythonInterpreter interp; 90 91 /*** Interpreted text. */ 92 private String text; 93 94 /*** The code. */ 95 private PyCode code; 96 97 /*** The AST node. */ 98 private modType node; 99 100 // ------------------------------------------------------------ 101 // Constructors 102 // ------------------------------------------------------------ 103 104 /*** Construct. 105 */ 106 protected Interp() 107 { 108 this.text = null; 109 } 110 111 // ------------------------------------------------------------ 112 // Instance methods 113 // ------------------------------------------------------------ 114 115 /*** Retrieve the text to evaluate. 116 * 117 * @return The text to evaluate. 118 */ 119 public String getText() 120 { 121 return this.text; 122 } 123 124 /*** Set the text to evaluate. 125 * 126 * @param text The text. 127 * @param type The type ("exec" or "eval"). 128 */ 129 protected void setText(String text, 130 String type) 131 { 132 this.text = text; 133 134 this.node = (modType) parser.parse( text, type ); 135 this.code = Py.compile( this.node, 136 "<jython>"); 137 } 138 139 /*** Retrieve the AST node. 140 * 141 * @return The node. 142 */ 143 public modType getNode() 144 { 145 return this.node; 146 } 147 148 /*** Retrieve the compiled code. 149 * 150 * @return The code. 151 */ 152 protected PyCode getCode() 153 { 154 return this.code; 155 } 156 157 /*** Configure a <code>PyDictionary</code> using a <code>Tuple</code> 158 * for variable bindings. 159 * 160 * @param tuple Tuple containing variable bindings. 161 * 162 * @return The dictionary 163 */ 164 protected PyDictionary setUpDictionary(Tuple tuple) 165 { 166 Hashtable table = new Hashtable(); 167 168 Set decls = tuple.getDeclarations(); 169 170 Iterator declIter = decls.iterator(); 171 Declaration eachDecl = null; 172 173 ObjectType objectType = null; 174 175 PyDictionary dict = new PyDictionary(); 176 177 while ( declIter.hasNext() ) 178 { 179 eachDecl = (Declaration) declIter.next(); 180 181 dict.setdefault( new PyString( eachDecl.getIdentifier().intern() ), 182 Py.java2py( tuple.get( eachDecl ) ) ); 183 } 184 185 return dict; 186 } 187 }

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