/*
* Copyright 2002,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.jelly.tags.core;
import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.TagSupport;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.jelly.expression.Expression;
import org.xml.sax.SAXException;
/** A tag which evaluates an expression
*
* @tag out
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 155420 $
*/
public class ExprTag extends TagSupport {
/** The expression to evaluate. */
private Expression value;
public ExprTag() {
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws JellyTagException {
if (value != null) {
String text = value.evaluateAsString(context);
if (text != null) {
try {
output.write(text);
}
catch (SAXException e) {
throw new JellyTagException("could not write the XMLOutput",e);
}
}
}
}
// Properties
//-------------------------------------------------------------------------
/**
* Sets the Jexl expression to evaluate.
*
* @required true
*/
public void setValue(Expression value) {
this.value = value;
}
}
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