/**
* 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.nuxeo.theme.jsf.facelets;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.el.ELException;
import javax.el.VariableMapper;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletException;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagConfig;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.nuxeo.ecm.platform.ui.web.util.BaseURL;
import org.nuxeo.theme.ApplicationType;
import org.nuxeo.theme.Manager;
import org.nuxeo.theme.NegotiationDef;
import org.nuxeo.theme.jsf.negotiation.JSFNegotiator;
import org.nuxeo.theme.negotiation.NegotiationException;
import org.nuxeo.theme.types.TypeFamily;
import com.sun.faces.facelets.FaceletContextImplBase;
import com.sun.faces.facelets.TemplateClient;
import com.sun.faces.facelets.el.VariableMapperWrapper;
import com.sun.faces.facelets.tag.TagHandlerImpl;
import com.sun.faces.facelets.tag.ui.DefineHandler;
import com.sun.faces.facelets.tag.ui.ParamHandler;
/**
* @author Jacob Hookom
* @version $Id: CompositionHandler.java,v 1.15 2009/02/02 22:58:59 driscoll
* Exp $
*/
public final class CompositionHandler extends TagHandlerImpl implements
TemplateClient {
private static final Log log = LogFactory.getLog(CompositionHandler.class);
public static final String Name = "theme";
protected final Map<String, DefineHandler> handlers;
protected final TagAttribute strategyAttribute;
protected final ParamHandler[] params;
static {
Manager.initializeProtocols();
}
/**
* @param config
*/
public CompositionHandler(TagConfig config) {
super(config);
handlers = new HashMap<String, DefineHandler>();
Iterator<DefineHandler> itr = this.findNextByType(DefineHandler.class);
DefineHandler d = null;
while (itr.hasNext()) {
d = itr.next();
this.handlers.put(d.getName(), d);
log.debug(tag + " found Define[" + d.getName() + "]");
}
final List paramC = new ArrayList();
itr = this.findNextByType(ParamHandler.class);
while (itr.hasNext()) {
paramC.add(itr.next());
}
if (paramC.size() > 0) {
this.params = new ParamHandler[paramC.size()];
for (int i = 0; i < this.params.length; i++) {
this.params[i] = (ParamHandler) paramC.get(i);
}
} else {
this.params = null;
}
strategyAttribute = getAttribute("strategy");
}
/*
* (non-Javadoc)
* @see
* com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext,
* javax.faces.component.UIComponent)
*/
@Override
public void apply(FaceletContext ctxObj, UIComponent parent)
throws IOException, FacesException, FaceletException, ELException {
FaceletContextImplBase ctx = (FaceletContextImplBase) ctxObj;
VariableMapper orig = ctx.getVariableMapper();
if (this.params != null) {
VariableMapper vm = new VariableMapperWrapper(orig);
ctx.setVariableMapper(vm);
for (int i = 0; i < this.params.length; i++) {
this.params[i].apply(ctx, parent);
}
}
ctx.extendClient(this);
try {
final FacesContext facesContext = ctx.getFacesContext();
// Get the negotiation strategy
final ExternalContext external = facesContext.getExternalContext();
final Map<String, Object> requestMap = external.getRequestMap();
final String root = external.getRequestContextPath();
final ApplicationType application = (ApplicationType) Manager.getTypeRegistry().lookup(
TypeFamily.APPLICATION, root);
String strategy = null;
if (application != null) {
final NegotiationDef negotiation = application.getNegotiation();
if (negotiation != null) {
requestMap.put("org.nuxeo.theme.default.theme",
negotiation.getDefaultTheme());
requestMap.put("org.nuxeo.theme.default.engine",
negotiation.getDefaultEngine());
requestMap.put("org.nuxeo.theme.default.perspective",
negotiation.getDefaultPerspective());
strategy = negotiation.getStrategy();
}
}
// override startegy if defined
if (strategyAttribute != null) {
strategy = strategyAttribute.getValue(ctx);
}
String contextPath = BaseURL.getContextPath();
if (strategy == null) {
log.error("Could not obtain the negotiation strategy for "
+ root);
external.redirect(contextPath
+ "/nxthemes/error/negotiationStrategyNotSet.faces");
} else {
try {
final String spec = new JSFNegotiator(strategy,
facesContext,
(HttpServletRequest) external.getRequest()).getSpec();
final URL themeUrl = new URL(spec);
requestMap.put("org.nuxeo.theme.url", themeUrl);
ctx.includeFacelet(parent, themeUrl);
} catch (NegotiationException e) {
log.error("Could not get default negotiation settings.", e);
external.redirect(contextPath
+ "/nxthemes/error/negotiationDefaultValuesNotSet.faces");
}
}
} finally {
ctx.popClient(this);
ctx.setVariableMapper(orig);
}
}
@Override
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 = this.handlers.get(name);
if (handler != null) {
handler.applyDefinition(ctx, parent);
return true;
} else {
return false;
}
} else {
this.nextHandler.apply(ctx, parent);
return true;
}
}
}