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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/taglibs/bsf/src/java/org/apache/commons/jelly/tags/bsf/BSFExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $ 3 * $Revision: 1.1 $ 4 * $Date: 2002/05/21 07:58:55 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights 11 * reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. The end-user documentation included with the redistribution, if 26 * any, must include the following acknowlegement: 27 * "This product includes software developed by the 28 * Apache Software Foundation (http://www.apache.org/)." 29 * Alternately, this acknowlegement may appear in the software itself, 30 * if and wherever such third-party acknowlegements normally appear. 31 * 32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 33 * Foundation" must not be used to endorse or promote products derived 34 * from this software without prior written permission. For written 35 * permission, please contact apache@apache.org. 36 * 37 * 5. Products derived from this software may not be called "Apache" 38 * nor may "Apache" appear in their names without prior written 39 * permission of the Apache Group. 40 * 41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * ==================================================================== 54 * 55 * This software consists of voluntary contributions made by many 56 * individuals on behalf of the Apache Software Foundation. For more 57 * information on the Apache Software Foundation, please see 58 * <http://www.apache.org/>;. 59 * 60 * $Id: BSFExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.tags.bsf; 63 64 import com.ibm.bsf.BSFEngine; 65 import com.ibm.bsf.BSFException; 66 import com.ibm.bsf.BSFManager; 67 68 import java.io.File; 69 70 import org.apache.commons.jelly.expression.Expression; 71 import org.apache.commons.jelly.expression.ExpressionFactory; 72 73 import org.apache.commons.logging.Log; 74 import org.apache.commons.logging.LogFactory; 75 76 /*** Represents a factory of BSF expressions 77 * 78 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 79 * @version $Revision: 1.1 $ 80 */ 81 public class BSFExpressionFactory implements ExpressionFactory { 82 83 /*** The logger of messages */ 84 private Log log = LogFactory.getLog( getClass() ); 85 86 private String language = "javascript"; 87 private BSFManager manager; 88 private BSFEngine engine; 89 private JellyContextRegistry registry = new JellyContextRegistry(); 90 91 public BSFExpressionFactory() { 92 } 93 94 // Properties 95 //------------------------------------------------------------------------- 96 97 /*** @return the BSF language to be used */ 98 public String getLanguage() { 99 return language; 100 } 101 102 public void setLanguage(String language) { 103 this.language = language; 104 } 105 106 /*** @return the BSF Engine to be used by this expression factory */ 107 public BSFEngine getBSFEngine() throws BSFException { 108 if ( engine == null ) { 109 engine = createBSFEngine(); 110 } 111 return engine; 112 } 113 114 public void setBSFEngine(BSFEngine engine) { 115 this.engine = engine; 116 } 117 118 public BSFManager getBSFManager() { 119 if ( manager == null ) { 120 manager = createBSFManager(); 121 manager.setObjectRegistry( registry ); 122 } 123 return manager; 124 } 125 126 public void setBSFManager(BSFManager manager) { 127 this.manager = manager; 128 manager.setObjectRegistry( registry ); 129 } 130 131 // ExpressionFactory interface 132 //------------------------------------------------------------------------- 133 public Expression createExpression(String text) throws Exception { 134 return new BSFExpression( text, getBSFEngine(), getBSFManager(), registry ); 135 } 136 137 // Implementation methods 138 //------------------------------------------------------------------------- 139 140 /*** Factory method */ 141 protected BSFEngine createBSFEngine() throws BSFException { 142 return getBSFManager().loadScriptingEngine( getLanguage() ); 143 } 144 145 /*** Factory method */ 146 protected BSFManager createBSFManager() { 147 BSFManager answer = new BSFManager(); 148 return answer; 149 } 150 }

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