1 /*
2 * $Header: $
3 * $Revision: 1.0 $
4 * $Date: $
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
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35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
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40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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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: $
61 */
62 package org.apache.commons.jelly.tags.dynabean;
63
64 import java.io.Writer;
65 import java.util.HashMap;
66 import java.util.Map;
67
68 import org.apache.commons.beanutils.BeanUtils;
69
70 import org.apache.commons.jelly.JellyContext;
71 import org.apache.commons.jelly.JellyException;
72 import org.apache.commons.jelly.Script;
73 import org.apache.commons.jelly.TagSupport;
74 import org.apache.commons.jelly.XMLOutput;
75 import org.apache.commons.jelly.expression.Expression;
76
77 import org.apache.commons.logging.Log;
78 import org.apache.commons.logging.LogFactory;
79
80 import org.apache.commons.beanutils.*;
81
82 /*** A tag which sets a variable from the result of an expression
83 *
84 * @author Theo Niemeijer
85 * @version 1.0
86 */
87 public class SetTag extends TagSupport {
88
89 /*** The Log to which logging calls will be made. */
90 private static final Log log = LogFactory.getLog(SetTag.class);
91
92 /*** The variable name to export. */
93 private String var;
94
95 /*** The variable scope to export */
96 private String scope;
97
98 /*** The expression to evaluate. */
99 private Expression value;
100
101 /*** The target object on which to set a property. */
102 private Object target;
103
104 /*** The name of the property to set on the target object. */
105 private String property;
106
107 public SetTag() {
108 }
109
110 // Tag interface
111 //-------------------------------------------------------------------------
112 public void doTag(XMLOutput output) throws Exception {
113 Object answer = null;
114 if ( value != null ) {
115 answer = value.evaluate(context);
116 }
117 else {
118 answer = getBodyText();
119 }
120
121 // Assume that if a var name and a property is given then
122 // var is the name of an object in the context
123 if (( var != null )
124 && ( property != null)
125 && ( target == null ))
126 {
127 // Get object from context
128 if ( scope != null ) {
129 target = context.getVariable(var, scope);
130 }
131 else {
132 target = context.getVariable(var);
133 }
134
135 if (target != null) {
136 var = null;
137 }
138 }
139
140 if ( var != null ) {
141
142
143 if ( scope != null ) {
144 context.setVariable(var, scope, answer);
145 }
146 else {
147 context.setVariable(var, answer);
148 }
149 }
150 else {
151 if ( target == null ) {
152 throw new JellyException( "Either a 'var' or a 'target' attribute must be defined for this tag" );
153 }
154 if ( property == null ) {
155 throw new JellyException( "You must define a 'property' attribute if you specify a 'target'" );
156 }
157 setPropertyValue( target, property, answer );
158 }
159 }
160
161 // Properties
162 //-------------------------------------------------------------------------
163 /*** Sets the variable name to define for this expression
164 */
165 public void setVar(String var) {
166 this.var = var;
167 }
168
169 /***
170 * Sets the variable scope for this variable. For example setting this value to 'parent' will
171 * set this value in the parent scope. When Jelly is run from inside a Servlet environment
172 * then other scopes will be available such as 'request', 'session' or 'application'.
173 *
174 * Other applications may implement their own custom scopes.
175 */
176 public void setScope(String scope) {
177 this.scope = scope;
178 }
179
180 /*** Sets the expression to evaluate. */
181 public void setValue(Expression value) {
182 this.value = value;
183 }
184
185 /*** Sets the target object on which to set a property. */
186 public void setTarget(Object target) {
187 this.target = target;
188 }
189
190 /*** Sets the name of the property to set on the target object. */
191 public void setProperty(String property) {
192 this.property = property;
193 }
194
195 // Implementation methods
196 //-------------------------------------------------------------------------
197 protected void setPropertyValue( Object target, String property, Object value ) throws Exception {
198 try {
199 if ( target instanceof Map ) {
200 Map map = (Map) target;
201 map.put( property, value );
202 }
203 else {
204 BeanUtils.setProperty( target, property, value );
205 }
206 }
207 catch (Exception e) {
208 log.error( "Failed to set the property: " + property + " on bean: " + target + " to value: " + value + " due to exception: " + e, e );
209 }
210 }
211
212 }
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