/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.myfaces.tobago.facelets;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.el.LegacyValueBinding;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagAttributeException;
import com.sun.facelets.tag.TagConfig;
import com.sun.facelets.tag.TagException;
import com.sun.facelets.tag.TagHandler;
import org.apache.myfaces.tobago.compat.FacesUtils;
import org.apache.myfaces.tobago.event.TabChangeListener;
import org.apache.myfaces.tobago.event.TabChangeSource;
import org.apache.myfaces.tobago.util.FacesVersion;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import java.io.IOException;
/*
* Date: 20.04.2006
* Time: 18:14:11
*/
public class TabChangeListenerHandler extends TagHandler {
private Class listenerType;
private final TagAttribute type;
private final TagAttribute binding;
public TabChangeListenerHandler(TagConfig config) {
super(config);
binding = getAttribute("binding");
type = getAttribute("type");
if (type != null) {
if (!type.isLiteral()) {
throw new TagAttributeException(tag, type, "Must be literal");
}
try {
this.listenerType = Class.forName(type.getValue());
} catch (Exception e) {
throw new TagAttributeException(tag, type, e);
}
}
}
public void apply(FaceletContext faceletContext, UIComponent parent)
throws IOException, FacesException, ELException {
if (parent instanceof TabChangeSource) {
// only process if parent was just created
if (parent.getParent() == null) {
TabChangeSource changeSource = (TabChangeSource) parent;
TabChangeListener listener = null;
ValueExpression valueExpression = null;
if (binding != null) {
valueExpression = binding.getValueExpression(faceletContext, TabChangeListener.class);
listener = (TabChangeListener) valueExpression.getValue(faceletContext);
}
if (listener == null) {
try {
listener = (TabChangeListener) listenerType.newInstance();
} catch (Exception e) {
throw new TagAttributeException(tag, type, e.getCause());
}
if (valueExpression != null) {
valueExpression.setValue(faceletContext, listener);
}
}
if (valueExpression != null) {
if (FacesVersion.supports12()) {
FacesUtils.addBindingOrExpressionTabChangeListener(changeSource, type.getValue(), valueExpression);
} else {
FacesUtils.addBindingOrExpressionTabChangeListener(changeSource, type.getValue(),
new LegacyValueBinding(valueExpression));
}
} else {
changeSource.addTabChangeListener(listener);
}
}
} else {
throw new TagException(tag, "Parent is not of type TabChangeSource, type is: " + parent);
}
}
}