/**
* 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.jsr250;
import java.lang.annotation.Annotation;
import java.lang.reflect.Member;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import com.google.inject.Binding;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.ProvisionException;
import com.google.inject.TypeLiteral;
import com.google.inject.name.Names;
import org.apache.camel.guice.inject.Injectors;
import org.apache.camel.guice.support.AnnotationMemberProviderSupport;
/**
* A useful base class for any provider which looks up values by name
* annotations or named entries in OSGi
*
* @version
*/
public abstract class NamedProviderSupport<A extends Annotation> extends
AnnotationMemberProviderSupport<A> {
@Inject
private Injector injector;
private Context context;
public Context getContext() {
return context;
}
@Inject(optional = true)
public void setContext(Context context) {
this.context = context;
}
protected Object provideObjectFromNamedBindingOrJndi(
TypeLiteral<?> requiredType, String name) {
Binding<?> binding = Injectors.getBinding(injector,
Key.get(requiredType, Names.named(name)));
if (binding != null) {
return binding.getProvider().get();
}
// TODO we may want to try avoid the dependency on JNDI classes
// for better operation in GAE?
try {
if (context == null) {
context = new InitialContext();
}
return context.lookup(name);
} catch (NamingException e) {
throw new ProvisionException("Failed to find name '" + name
+ "' in JNDI. Cause: " + e, e);
}
}
/**
* if no valid name is present on the annotation then use the member name
*/
protected String getValueName(String nameFromAnnotation, Member member) {
if (nameFromAnnotation == null || nameFromAnnotation.length() == 0) {
nameFromAnnotation = member.getName();
}
if (nameFromAnnotation == null || nameFromAnnotation.length() == 0) {
throw new IllegalArgumentException("No name defined");
}
return nameFromAnnotation;
}
}