/**
* 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.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import javax.naming.Context;
import javax.naming.NamingException;
import com.google.inject.Binding;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Provider;
import com.google.inject.name.Named;
import org.apache.camel.guice.jndi.internal.Classes;
/**
* @version
*/
public final class JndiBindings {
private JndiBindings() {
//Helper class
}
/**
* Binds the given injector and its binding providers to the given JNDI
* context using <a
* href="http://code.google.com/p/camel-extra/wiki/GuiceJndi">this mapping
* mechanism</a>.
* <p/>
* This will expose all of the bindings providers to JNDI along with any
* bindings which are annotated with {@link JndiBind} or {@link @Named} to
* the given JNDI context.
*
* @param context
* the context to export objects to
* @param injector
* the injector used to find the bindings
*/
public static void bindInjectorAndBindings(Context context,
Injector injector, Properties jndiNames) throws NamingException {
// lets find all the exported bindings
Set<Entry<Key<?>, Binding<?>>> entries = injector.getBindings()
.entrySet();
for (Entry<Key<?>, Binding<?>> entry : entries) {
Key<?> key = entry.getKey();
Binding<?> binding = entry.getValue();
Annotation annotation = key.getAnnotation();
Type type = key.getTypeLiteral().getType();
JndiBind jndiBind = null;
if (type instanceof Class) {
Class<?> aClass = (Class<?>) type;
jndiBind = aClass.getAnnotation(JndiBind.class);
}
if (annotation instanceof JndiBind) {
jndiBind = (JndiBind) annotation;
}
String jndiName = null;
if (jndiBind != null) {
jndiName = jndiBind.value();
}
if (jndiName == null) {
if (annotation instanceof Named) {
Named named = (Named) annotation;
String name = named.value();
jndiName = type.toString() + "/" + name;
} else if (type instanceof Class<?>) {
Class<?> aClass = (Class<?>) type;
if (annotation == null) {
jndiName = aClass.getName();
} else {
jndiName = aClass.getName() + annotation;
}
}
}
if (jndiName != null) {
Object value = binding.getProvider();
if (value != null) {
context.bind(jndiName, value);
}
}
}
for (Entry<Object, Object> entry : jndiNames.entrySet()) {
String jndiName = entry.getKey().toString();
String expression = entry.getValue().toString();
Provider<?> provider = getProviderForExpression(injector,
expression);
if (provider != null) {
context.bind(jndiName, provider);
}
}
}
static Provider<?> getProviderForExpression(Injector injector,
String expression) {
// TODO we could support more complex expressions
// like 'className/name' to map to @Named annotations
// or even 'className@annotationType(values) etc
try {
Class<?> type = Classes.loadClass(expression,
JndiBindings.class.getClassLoader());
return injector.getProvider(type);
} catch (ClassNotFoundException e) {
return null;
}
}
}