/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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.apache.cocoon.forms.util;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.ServiceSelector;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.cocoon.components.LifecycleHelper;
/**
* A very simple ServiceSelector for ThreadSafe services.
*
* @version $Id: SimpleServiceSelector.java,v 1.2 2004/04/15 18:09:03 bruno Exp $
*/
public class SimpleServiceSelector extends AbstractLogEnabled implements ServiceSelector, Configurable, LogEnabled,
Serviceable, Disposable, Contextualizable {
private final String hintShortHand;
private final Class componentClass;
private Map components = new HashMap();
private ServiceManager serviceManager;
private Context context;
public SimpleServiceSelector(String hintShortHand, Class componentClass) {
this.hintShortHand = hintShortHand;
this.componentClass = componentClass;
}
public void service(ServiceManager serviceManager) throws ServiceException {
this.serviceManager = serviceManager;
}
public void contextualize(Context context) throws ContextException {
this.context = context;
}
public void configure(Configuration configuration) throws ConfigurationException {
Configuration[] componentConfs = configuration.getChildren(hintShortHand);
for (int i = 0; i < componentConfs.length; i++) {
String name = componentConfs[i].getAttribute("name");
String src = componentConfs[i].getAttribute("src");
Class clazz = null;
try {
clazz = Class.forName(src);
} catch (ClassNotFoundException e) {
throw new ConfigurationException("Class not found: " + src + ", declared at " + componentConfs[i].getLocation(), e);
}
if (!componentClass.isAssignableFrom(clazz))
throw new ConfigurationException("The class \"" + src + "\" is of an incorrect type, it should implement or exted " + componentClass.getName());
Object component = null;
try {
component = clazz.newInstance();
LifecycleHelper lifecycleHelper = new LifecycleHelper(getLogger(), context, serviceManager, null, componentConfs[i]);
lifecycleHelper.setupComponent(component);
} catch (Exception e) {
throw new ConfigurationException("Error creating " + hintShortHand + " declared at " + componentConfs[i].getLocation(), e);
}
components.put(name, component);
}
}
public Object select(Object hint) throws ServiceException {
if (!isSelectable(hint))
throw new ServiceException((String)hint, "Non-existing component for this hint");
String stringHint = (String)hint;
return components.get(stringHint);
}
public boolean isSelectable(Object hint) {
String stringHint = (String)hint;
return components.containsKey(stringHint);
}
public void release(Object o) {
}
public void dispose() {
Iterator serviceIt = components.values().iterator();
while (serviceIt.hasNext()) {
Object service = serviceIt.next();
if (service instanceof Disposable) {
try {
((Disposable)service).dispose();
} catch (Exception e) {
getLogger().error("Error disposing service " + service, e);
}
}
}
}
}