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org.primefaces.behavior.base.AbstractBehaviorHandler Maven / Gradle / Ivy
/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.behavior.base;
import java.beans.BeanDescriptor;
import java.beans.BeanInfo;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.component.behavior.ClientBehaviorBase;
import javax.faces.component.behavior.ClientBehaviorHolder;
import javax.faces.context.FacesContext;
import javax.faces.view.AttachedObjectHandler;
import javax.faces.view.AttachedObjectTarget;
import javax.faces.view.BehaviorHolderAttachedObjectHandler;
import javax.faces.view.BehaviorHolderAttachedObjectTarget;
import javax.faces.view.facelets.ComponentHandler;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagException;
import javax.faces.view.facelets.TagHandler;
import org.primefaces.behavior.ajax.AjaxBehaviorHandler;
import org.primefaces.context.RequestContext;
public abstract class AbstractBehaviorHandler
extends TagHandler implements BehaviorHolderAttachedObjectHandler {
private final TagAttribute event;
public AbstractBehaviorHandler(TagConfig config) {
super(config);
this.event = this.getAttribute("event");
}
public void apply(FaceletContext faceletContext, UIComponent parent) throws IOException {
if (!ComponentHandler.isNew(parent)) {
return;
}
String eventName = getEventName();
if (UIComponent.isCompositeComponent(parent)) {
boolean tagApplied = false;
if (parent instanceof ClientBehaviorHolder) {
applyAttachedObject(faceletContext, parent);
tagApplied = true;
}
BeanInfo componentBeanInfo = (BeanInfo) parent.getAttributes().get(UIComponent.BEANINFO_KEY);
if (null == componentBeanInfo) {
throw new TagException(tag, "Composite component does not have BeanInfo attribute");
}
BeanDescriptor componentDescriptor = componentBeanInfo.getBeanDescriptor();
if (null == componentDescriptor) {
throw new TagException(tag, "Composite component BeanInfo does not have BeanDescriptor");
}
List targetList = (List)componentDescriptor.getValue(AttachedObjectTarget.ATTACHED_OBJECT_TARGETS_KEY);
if (null == targetList && !tagApplied) {
throw new TagException(tag, "Composite component does not support behavior events");
}
boolean supportedEvent = false;
for (AttachedObjectTarget target : targetList) {
if (target instanceof BehaviorHolderAttachedObjectTarget) {
BehaviorHolderAttachedObjectTarget behaviorTarget = (BehaviorHolderAttachedObjectTarget) target;
if ((null != eventName && eventName.equals(behaviorTarget.getName()))
|| (null == eventName && behaviorTarget.isDefaultEvent())) {
supportedEvent = true;
break;
}
}
}
if(supportedEvent) {
// Workaround to implementation specific composite component handlers
FacesContext context = FacesContext.getCurrentInstance();
if (context.getExternalContext().getApplicationMap().containsKey("com.sun.faces.ApplicationAssociate")) {
addAttachedObjectHandlerToMojarra(parent);
}
else {
addAttachedObjectHandlerToMyFaces(parent, faceletContext);
}
}
else {
if (!tagApplied) {
throw new TagException(tag, "Composite component does not support event " + eventName);
}
}
}
else if (parent instanceof ClientBehaviorHolder) {
applyAttachedObject(faceletContext, parent);
}
else {
throw new TagException(this.tag, "Unable to attach behavior to non-ClientBehaviorHolder parent");
}
}
public String getEventName() {
if (event == null) {
return null;
}
if (event.isLiteral()) {
return event.getValue();
} else {
FaceletContext faceletContext = getFaceletContext(FacesContext.getCurrentInstance());
ValueExpression expression = event.getValueExpression(faceletContext, String.class);
return (String) expression.getValue(faceletContext);
}
}
protected abstract E createBehavior(FaceletContext ctx, String eventName);
protected void setBehaviorAttribute(FaceletContext ctx, E behavior, TagAttribute attr, Class type) {
if (attr != null) {
String attributeName = attr.getLocalName();
if (attr.isLiteral()) {
behavior.setLiteral(attributeName, attr.getObject(ctx, type));
} else {
behavior.setValueExpression(attributeName, attr.getValueExpression(ctx, type));
}
}
}
protected FaceletContext getFaceletContext(FacesContext context) {
FaceletContext faceletContext = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
if (faceletContext == null) {
faceletContext = (FaceletContext) context.getAttributes().get("com.sun.faces.facelets.FACELET_CONTEXT");
}
return faceletContext;
}
public void applyAttachedObject(FacesContext context, UIComponent parent) {
FaceletContext faceletContext = getFaceletContext(context);
applyAttachedObject(faceletContext, parent);
}
public void applyAttachedObject(FaceletContext faceletContext, UIComponent parent) {
ClientBehaviorHolder holder = (ClientBehaviorHolder) parent;
String eventName = getEventName();
if (null == eventName) {
eventName = holder.getDefaultEventName();
if (null == eventName) {
throw new TagException(this.tag, "Event attribute could not be determined: " + eventName);
}
} else {
Collection eventNames = holder.getEventNames();
if (!eventNames.contains(eventName)) {
throw new TagException(this.tag, "Event:" + eventName + " is not supported.");
}
}
ClientBehaviorBase behavior = createBehavior(faceletContext, eventName);
holder.addClientBehavior(eventName, behavior);
}
public String getFor() {
return null;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mojarra ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
protected static String MOJARRA_ATTACHED_OBJECT_HANDLERS_KEY = "javax.faces.RetargetableHandlers";
protected static String MOJARRA_22_ATTACHED_OBJECT_HANDLERS_KEY = "javax.faces.view.AttachedObjectHandlers";
protected void addAttachedObjectHandlerToMojarra(UIComponent component) {
String key = MOJARRA_ATTACHED_OBJECT_HANDLERS_KEY;
if (RequestContext.getCurrentInstance().getApplicationContext().getConfig().isAtLeastJSF22())
{
key = MOJARRA_22_ATTACHED_OBJECT_HANDLERS_KEY;
}
Map attrs = component.getAttributes();
List result = (List) attrs.get(key);
if (result == null) {
result = new ArrayList();
attrs.put(key, result);
}
result.add(this);
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ MyFaces ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
protected static Method MYFACES_GET_COMPOSITION_CONTEXT_INSTANCE;
protected static Method MYFACES_ADD_ATTACHED_OBJECT_HANDLER;
protected void addAttachedObjectHandlerToMyFaces(UIComponent component, FaceletContext ctx) {
try {
if (MYFACES_GET_COMPOSITION_CONTEXT_INSTANCE == null || MYFACES_ADD_ATTACHED_OBJECT_HANDLER == null) {
Class clazz = Class.forName("org.apache.myfaces.view.facelets.FaceletCompositionContext");
MYFACES_GET_COMPOSITION_CONTEXT_INSTANCE = clazz.getDeclaredMethod("getCurrentInstance", FaceletContext.class);
MYFACES_ADD_ATTACHED_OBJECT_HANDLER = clazz.getDeclaredMethod("addAttachedObjectHandler", UIComponent.class, AttachedObjectHandler.class);
}
Object faceletCompositionContextInstance = MYFACES_GET_COMPOSITION_CONTEXT_INSTANCE.invoke(null, ctx);
MYFACES_ADD_ATTACHED_OBJECT_HANDLER.invoke(faceletCompositionContextInstance, component, this);
}
catch (Exception ex) {
Logger.getLogger(AjaxBehaviorHandler.class.getName()).log(Level.SEVERE, "Could not add AttachedObjectHandler to MyFaces!", ex);
}
}
}
