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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