/**
* 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.camel.guice.jndi;
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 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 org.apache.camel.guice.inject.Injectors;
import org.apache.camel.guice.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
*/
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
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
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;
}
}