/*
* Copyright 2004, 2005, 2006 Odysseus Software GmbH
*
* 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 de.odysseus.calyxo.struts.base;
import java.util.HashMap;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.ModuleConfig;
import org.apache.struts.util.ModuleUtils;
import de.odysseus.calyxo.base.ModuleGroup;
import de.odysseus.calyxo.base.ModuleContext;
import de.odysseus.calyxo.base.ModuleSelector;
import de.odysseus.calyxo.base.ModuleSupport;
/**
* Module group to collect instances of {@link de.odysseus.calyxo.struts.base.StrutsModuleContext}.
*
* @author Christoph Beck
*/
public final class StrutsModuleGroup extends ModuleGroup {
private static final String MODULE_CONTAINER_KEY = "de.odysseus.calyxo.struts.module.container";
/**
* Loookup module container instance
*/
public static final StrutsModuleGroup getInstance(ActionServlet servlet) {
ServletContext context = servlet.getServletContext();
StrutsModuleGroup result = (StrutsModuleGroup)context.getAttribute(MODULE_CONTAINER_KEY);
if (result == null) {
result = new StrutsModuleGroup(ModuleSupport.getInstance(context));
context.setAttribute(MODULE_CONTAINER_KEY, result);
}
return result;
}
private final HashMap prefix2name = new HashMap();
private StrutsModuleGroup(ModuleSupport support) {
super(support);
}
protected ModuleSelector extend(final ModuleSelector delegate) {
return new ModuleSelector() {
public ModuleContext getModuleContext(HttpServletRequest request) {
ModuleConfig config = ModuleUtils.getInstance().getModuleConfig(request);
if (config != null) {
ModuleContext module = getStrutsModuleContext(config);
if (module != null) {
return module;
}
}
return delegate.getModuleContext(request);
}
};
}
public StrutsModuleContext getStrutsModuleContext(ModuleConfig config) {
return getStrutsModuleContext((String)prefix2name.get(config.getPrefix()));
}
public StrutsModuleContext getStrutsModuleContext(String name) {
return (StrutsModuleContext)getModuleContext(name);
}
/* (non-Javadoc)
* @see de.odysseus.calyxo.struts.base.StrutsModuleGroup#add(de.odysseus.calyxo.struts.base.StrutsModuleContext)
*/
public void add(StrutsModuleContext context) throws ServletException {
super.add(context);
prefix2name.put(context.getPrefix(), context.getName());
}
/* (non-Javadoc)
* @see de.odysseus.calyxo.struts.base.StrutsModuleGroup#remove(de.odysseus.calyxo.struts.base.StrutsModuleContext)
*/
public void remove(StrutsModuleContext context) {
super.remove(context);
prefix2name.remove(context.getPrefix());
}
}