/**
* Licensed under the Common Development and Distribution License,
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.sun.com/cddl/
*
* 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 com.sun.facelets.tag;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import javax.el.ELException;
import javax.el.VariableMapper;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.TemplateClient;
import com.sun.facelets.el.VariableMapperWrapper;
import com.sun.facelets.tag.ui.DefineHandler;
/**
* A Tag that is specified in a FaceletFile. Takes all attributes specified and
* sets them on the FaceletContext before including the targeted Facelet file.
*
* @author Jacob Hookom
* @version $Id: UserTagHandler.java,v 1.11 2007/09/24 16:15:49 youngm Exp $
*/
final class UserTagHandler extends TagHandler implements TemplateClient {
protected final TagAttribute[] vars;
protected final URL location;
protected final Map handlers;
/**
* @param config
*/
public UserTagHandler(TagConfig config, URL location) {
super(config);
this.vars = this.tag.getAttributes().getAll();
this.location = location;
Iterator itr = this.findNextByType(DefineHandler.class);
if (itr.hasNext()) {
handlers = new HashMap();
DefineHandler d = null;
while (itr.hasNext()) {
d = (DefineHandler) itr.next();
this.handlers.put(d.getName(), d);
}
} else {
handlers = null;
}
}
/**
* Iterate over all TagAttributes and set them on the FaceletContext's
* VariableMapper, then include the target Facelet. Finally, replace the old
* VariableMapper.
*
* @see TagAttribute#getValueExpression(FaceletContext, Class)
* @see VariableMapper
* @see com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext,
* javax.faces.component.UIComponent)
*/
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException, FacesException, FaceletException, ELException {
VariableMapper orig = ctx.getVariableMapper();
// setup a variable map
if (this.vars.length > 0) {
VariableMapper varMapper = new VariableMapperWrapper(orig);
for (int i = 0; i < this.vars.length; i++) {
varMapper.setVariable(this.vars[i].getLocalName(), this.vars[i]
.getValueExpression(ctx, Object.class));
}
ctx.setVariableMapper(varMapper);
}
// eval include
try {
ctx.pushClient(this);
ctx.includeFacelet(parent, this.location);
} catch (FileNotFoundException e) {
throw new TagException(this.tag, e.getMessage());
} finally {
// make sure we undo our changes
ctx.popClient(this);
ctx.setVariableMapper(orig);
}
}
public boolean apply(FaceletContext ctx, UIComponent parent, String name) throws IOException, FacesException, FaceletException, ELException {
if (name != null) {
if (this.handlers == null) {
return false;
}
DefineHandler handler = (DefineHandler) this.handlers.get(name);
if (handler != null) {
handler.applyDefinition(ctx, parent);
return true;
} else {
return false;
}
} else {
this.nextHandler.apply(ctx, parent);
return true;
}
}
}