/*
* 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.impl;
import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;
import org.apache.commons.jelly.DynaTagSupport;
import org.apache.commons.jelly.JellyContext;
import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.Script;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* <p><code>DynamicTag</code> is a tag that is created from
* inside a Jelly script as a Jelly template and will invoke a
* given script, passing in its instantiation attributes
* as variables and will allow the template to invoke its instance body.</p>
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
* @version $Revision: 1.10 $
*/
public class DynamicTag extends DynaTagSupport {
/** The Log to which logging calls will be made. */
private static final Log log = LogFactory.getLog(DynamicTag.class);
/** The template script */
private Script template;
/** The instance attributes */
private Map attributes = new HashMap();
public DynamicTag() {
}
public DynamicTag(Script template) {
this.template = template;
}
// Tag interface
//-------------------------------------------------------------------------
public void doTag(XMLOutput output) throws JellyTagException {
if ( log.isDebugEnabled() ) {
log.debug("Invoking dynamic tag with attributes: " + attributes);
}
attributes.put("org.apache.commons.jelly.body", getBody());
// create new context based on current attributes
JellyContext newJellyContext = context.newJellyContext(attributes);
Map attrMap = new HashMap();
for ( Iterator keyIter = this.attributes.keySet().iterator();
keyIter.hasNext();) {
String key = (String) keyIter.next();
if ( key.endsWith( "Attr" ) ) {
Object value = this.attributes.get( key );
attrMap.put( key, value );
attrMap.put( key.substring( 0, key.length()-4 ), value );
}
}
newJellyContext.setVariable( "attrs", attrMap );
getTemplate().run(newJellyContext, output);
}
// DynaTag interface
//-------------------------------------------------------------------------
public void setAttribute(String name, Object value) {
attributes.put(name, value);
attributes.put(name + "Attr", value);
}
// Properties
//-------------------------------------------------------------------------
/** The template to be executed by this tag which may well
* invoke this instances body from inside the template
*/
public Script getTemplate() {
return template;
}
public void setTemplate(Script template) {
this.template = template;
}
}