/*
* Copyright 2012 Jason Miller
*
* 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 jj.configuration;
import javax.inject.Inject;
import com.google.inject.Binder;
import com.google.inject.Injector;
import com.google.inject.Provider;
/**
* does a little funky dance so as to provide
* injectable configuration objects
*
* @author jason
*
*/
public class ConfigurationObjectBinder {
private final Binder binder;
public ConfigurationObjectBinder(final Binder binder) {
this.binder = binder;
}
public <T> void to(final Class<T> configurationInterface) {
assert configurationInterface.isInterface() : "configuration objects must be interfaces";
Provider<T> provider = new Provider<T>() {
@Inject ConfigurationObjectImplementation configurationObjectImplementation;
@Inject Injector injector;
@Override
public T get() {
return injector.getInstance(configurationObjectImplementation.implementationClassFor(configurationInterface));
}
};
binder.requestInjection(provider);
binder.bind(configurationInterface).toProvider(provider);
}
}