org.apache.myfaces.custom.aliasbean.AliasBeansScope Maven / Gradle / Ivy
/*
* 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.custom.aliasbean;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.faces.FacesException;
import javax.faces.component.ContextCallback;
import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.FacesEvent;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFComponent;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspProperties;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspProperty;
import org.apache.myfaces.shared_tomahawk.component.BindingAware;
import org.apache.myfaces.shared_tomahawk.util.RestoreStateUtils;
/**
* Holds several aliases that are configured by aliasBean tags.
*
* The aliasBean tag must enclose all the components that are within the scope
* of the alias. When multiple aliasas are defined, this makes the page structure
* very clumsy; for example defining 5 aliases means the content must be nested
* 5 indentation levels deep. This tag instead allows the content block to be
* wrapped in just one AliasBeansScope tag, and then have AliasBean tags with
* empty bodies added as direct children of this component. The scope of the AliasBean
* tag still starts when the tag begins, but instead of ending when the tag ends
* the scope of the nested AliasBean tags extends to the end of this component.
*
*
* @author Sylvain Vieujot (latest modification by $Author: lu4242 $)
* @version $Revision: 1082663 $ $Date: 2011-03-17 14:47:10 -0500 (Thu, 17 Mar 2011) $
*/
@JSFComponent(
name = "t:aliasBeansScope",
tagClass = "org.apache.myfaces.custom.aliasbean.AliasBeansScopeTag",
tagHandler = "org.apache.myfaces.custom.aliasbean.AliasBeansScopeTagHandler")
@JSFJspProperties(properties={
@JSFJspProperty(
name = "rendered",
returnType = "boolean",
tagExcluded = true),
@JSFJspProperty(
name = "binding",
returnType = "java.lang.String",
tagExcluded = true)
})
public class AliasBeansScope extends UIComponentBase implements BindingAware
{
static final Log log = LogFactory.getLog(AliasBeansScope.class);
public static final String COMPONENT_TYPE = "org.apache.myfaces.AliasBeansScope";
public static final String COMPONENT_FAMILY = "javax.faces.Data";
private ArrayList _aliases = new ArrayList();
transient FacesContext _context = null;
void addAlias(Alias alias)
{
_aliases.add(alias);
}
public String getFamily()
{
return COMPONENT_FAMILY;
}
public String getRendererType() {
return null;
}
public Object saveState(FacesContext context)
{
log.debug("saveState");
_context = context;
return super.saveState(context);
}
public void restoreState(FacesContext context, Object state)
{
log.debug("restoreState");
_context = context;
super.restoreState(context, state);
}
public Object processSaveState(FacesContext context)
{
if (context == null)
throw new NullPointerException("context");
if (isTransient())
return null;
makeAliases(context);
Map facetMap = null;
for (Iterator it = getFacets().entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = (Map.Entry) it.next();
if (facetMap == null)
facetMap = new HashMap();
UIComponent component = (UIComponent) entry.getValue();
if (!component.isTransient())
{
facetMap.put(entry.getKey(), component.processSaveState(context));
}
}
List childrenList = null;
if (getChildCount() > 0)
{
for (Iterator it = getChildren().iterator(); it.hasNext();)
{
UIComponent child = (UIComponent) it.next();
if (!child.isTransient())
{
if (childrenList == null)
childrenList = new ArrayList(getChildCount());
childrenList.add(child.processSaveState(context));
}
}
}
removeAliases(context);
return new Object[]{saveState(context), facetMap, childrenList};
}
public void processRestoreState(FacesContext context, Object state)
{
if (context == null)
throw new NullPointerException("context");
Object myState = ((Object[]) state)[0];
restoreState(context, myState);
makeAliases(context);
Map facetMap = (Map) ((Object[]) state)[1];
for (Iterator it = getFacets().entrySet().iterator(); it.hasNext();)
{
Map.Entry entry = (Map.Entry) it.next();
Object facetState = facetMap.get(entry.getKey());
if (facetState != null)
{
((UIComponent) entry.getValue()).processRestoreState(context, facetState);
}
else
{
context.getExternalContext().log("No state found to restore facet " + entry.getKey());
}
}
List childrenList = (List) ((Object[]) state)[2];
if (getChildCount() > 0)
{
int idx = 0;
for (Iterator it = getChildren().iterator(); it.hasNext();)
{
UIComponent child = (UIComponent) it.next();
Object childState = childrenList.get(idx++);
if (childState != null)
{
child.processRestoreState(context, childState);
}
else
{
context.getExternalContext().log("No state found to restore child of component " + getId());
}
}
}
removeAliases(context);
}
public void processValidators(FacesContext context)
{
log.debug("processValidators");
makeAliases(context);
super.processValidators(context);
removeAliases(context);
}
public void processDecodes(FacesContext context)
{
log.debug("processDecodes");
makeAliases(context);
super.processDecodes(context);
removeAliases(context);
}
public void processUpdates(FacesContext context)
{
log.debug("processUpdates");
makeAliases(context);
super.processUpdates(context);
removeAliases(context);
}
public void encodeBegin(FacesContext context) throws IOException
{
log.debug("encodeBegin");
makeAliases(context);
}
public void encodeEnd(FacesContext context)
{
log.debug("encodeEnd");
removeAliases(context);
}
public void queueEvent(FacesEvent event)
{
super.queueEvent(new FacesEventWrapper(event, this));
}
public void broadcast(FacesEvent event) throws AbortProcessingException
{
makeAliases();
if (event instanceof FacesEventWrapper)
{
FacesEvent originalEvent = ((FacesEventWrapper) event).getWrappedFacesEvent();
originalEvent.getComponent().broadcast(originalEvent);
}
else
{
super.broadcast(event);
}
removeAliases();
}
void makeAliases(FacesContext context)
{
_context = context;
makeAliases();
}
private void makeAliases()
{
for (Iterator i = _aliases.iterator(); i.hasNext();)
((Alias) i.next()).make(_context);
}
void removeAliases(FacesContext context)
{
_context = context;
removeAliases();
}
private void removeAliases()
{
for (Iterator i = _aliases.iterator(); i.hasNext();)
((Alias) i.next()).remove(_context);
}
public void handleBindings()
{
makeAliases(getFacesContext());
RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(getFacesContext(), this, true);
removeAliases(getFacesContext());
}
@Override
public boolean invokeOnComponent(FacesContext context, String clientId,
ContextCallback callback) throws FacesException
{
makeAliases(getFacesContext());
try
{
return super.invokeOnComponent(context, clientId, callback);
}
finally
{
removeAliases(getFacesContext());
}
}
}
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