/**
* Copyright (C) 2006 Google Inc.
*
* 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.guiceyfruit.jndi;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.Scopes;
import java.util.Hashtable;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;
import org.guiceyfruit.Injectors;
import org.guiceyfruit.jndi.internal.JndiContext;
/**
* A factory of the Guice JNDI provider which creates an injector from all the available modules
* specified in the space separated {@link Injectors#MODULE_CLASS_NAMES} property. <p/> For more
* details of how this JNDI provider works see <a href="http://code.google.com/p/camel-extra/wiki/GuiceJndi">the
* wiki documentation</a>
*
* @version $Revision: 656978 $
*/
public class GuiceInitialContextFactory implements InitialContextFactory {
public static final String NAME_PREFIX = "org.guiceyfruit.jndi/";
/**
* Creates a new context with the given environment.
*
* @param environment the environment, must not be <tt>null</tt>
* @return the created context.
* @throws NamingException is thrown if creation failed.
*/
public Context getInitialContext(final Hashtable environment) throws NamingException {
try {
// lets avoid infinite recursion with a provider creating an InitialContext by binding the
// singleton initial context into the injector
Injector injector = Injectors.createInjector(environment, new AbstractModule() {
protected void configure() {
bind(Context.class).toProvider(new Provider<Context>() {
@Inject
Injector injector;
public Context get() {
JndiContext context = new JndiContext(environment);
Properties jndiNames = createJndiNamesProperties(environment);
try {
JndiBindings.bindInjectorAndBindings(context, injector, jndiNames);
return context;
}
catch (NamingException e) {
throw new ProvisionException("Failed to create JNDI bindings. Reason: " + e, e);
}
}
}).in(Scopes.SINGLETON);
}
});
return injector.getInstance(Context.class);
}
catch (Exception e) {
NamingException exception = new NamingException(e.getMessage());
exception.initCause(e);
throw exception;
}
}
/**
* Creates a properties object containing all of the values whose keys start with {@link
* #NAME_PREFIX} with the prefix being removed on the key
*
* @return a properties object
*/
private Properties createJndiNamesProperties(Hashtable environment) {
Set<Map.Entry> set = environment.entrySet();
Properties answer = new Properties();
for (Entry entry : set) {
String key = entry.getKey().toString();
if (key.startsWith(NAME_PREFIX)) {
String name = key.substring(NAME_PREFIX.length());
Object value = entry.getValue();
answer.put(name, value);
}
}
return answer;
}
}