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org.apache.commons.jelly.tags.dynabean.SetTag	63%	92%

1		/*
2		* Copyright 2002,2004 The Apache Software Foundation.
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License");
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*/
16		package org.apache.commons.jelly.tags.dynabean;
17
18		import java.util.Map;
19
20		import org.apache.commons.beanutils.BeanUtils;
21		import org.apache.commons.jelly.JellyTagException;
22		import org.apache.commons.jelly.TagSupport;
23		import org.apache.commons.jelly.XMLOutput;
24		import org.apache.commons.jelly.expression.Expression;
25		import org.apache.commons.logging.Log;
26		import org.apache.commons.logging.LogFactory;
27
28		/** A tag which sets a variable from the result of an expression
29		*
30		* @author Theo Niemeijer
31		* @version 1.0
32		*/
33		public class SetTag extends TagSupport {
34
35		/** The Log to which logging calls will be made. */
36	6	private static final Log log = LogFactory.getLog(SetTag.class);
37
38		/** The variable name to export. */
39		private String var;
40
41		/** The variable scope to export */
42		private String scope;
43
44		/** The expression to evaluate. */
45		private Expression value;
46
47		/** The target object on which to set a property. */
48		private Object target;
49
50		/** The name of the property to set on the target object. */
51		private String property;
52
53	21	public SetTag() {
54	21	}
55
56		// Tag interface
57		//-------------------------------------------------------------------------
58		public void doTag(XMLOutput output) throws JellyTagException {
59	21	Object answer = null;
60	21	if ( value != null ) {
61	21	answer = value.evaluate(context);
62		}
63		else {
64	0	answer = getBodyText();
65		}
66
67		// Assume that if a var name and a property is given then
68		// var is the name of an object in the context
69	21	if (( var != null )
70		&& ( property != null)
71		&& ( target == null ))
72		{
73		// Get object from context
74	21	if ( scope != null ) {
75	0	target = context.getVariable(var, scope);
76		}
77		else {
78	21	target = context.getVariable(var);
79		}
80
81	21	if (target != null) {
82	21	var = null;
83		}
84		}
85
86	21	if ( var != null ) {
87
88
89	0	if ( scope != null ) {
90	0	context.setVariable(var, scope, answer);
91		}
92		else {
93	0	context.setVariable(var, answer);
94		}
95		}
96		else {
97	21	if ( target == null ) {
98	0	throw new JellyTagException( "Either a 'var' or a 'target' attribute must be defined for this tag" );
99		}
100	21	if ( property == null ) {
101	0	throw new JellyTagException( "You must define a 'property' attribute if you specify a 'target'" );
102		}
103	21	setPropertyValue( target, property, answer );
104		}
105	21	}
106
107		// Properties
108		//-------------------------------------------------------------------------
109		/** Sets the variable name to define for this expression
110		*/
111		public void setVar(String var) {
112	21	this.var = class="keyword">var;
113	21	}
114
115		/**
116		* Sets the variable scope for this variable. For example setting this value to 'parent' will
117		* set this value in the parent scope. When Jelly is run from inside a Servlet environment
118		* then other scopes will be available such as 'request', 'session' or 'application'.
119		*
120		* Other applications may implement their own custom scopes.
121		*/
122		public void setScope(String scope) {
123	0	this.scope = scope;
124	0	}
125
126		/** Sets the expression to evaluate. */
127		public void setValue(Expression value) {
128	21	this.value = value;
129	21	}
130
131		/** Sets the target object on which to set a property. */
132		public void setTarget(Object target) {
133	0	this.target = target;
134	0	}
135
136		/** Sets the name of the property to set on the target object. */
137		public void setProperty(String property) {
138	21	this.property = property;
139	21	}
140
141		// Implementation methods
142		//-------------------------------------------------------------------------
143		protected void setPropertyValue( Object target, String property, Object value ) {
144		try {
145	21	if ( target instanceof Map ) {
146	0	Map map = (Map) target;
147	0	map.put( property, value );
148		}
149		else {
150	21	BeanUtils.setProperty( target, property, value );
151		}
152		}
153	0	catch (Exception e) {
154	0	log.error( "Failed to set the property: " + property + " on bean: " + target + " to value: " + value + " due to exception: " + e, e );
155	21	}
156	21	}
157
158		}

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