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/**
 * Copyright (C) 2010 Daniel Manzke 
 *
 * 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 de.devsurf.injection.guice.scanner;

import java.lang.annotation.Annotation;

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.name.Names;

import de.devsurf.injection.guice.DynamicModule;

/**
 * Utility which can be used, to keep your Code clean of Guice Dependencies.
 * 
 * @author Daniel Manzke
 * 
 */
public class InjectionUtil {
    private Injector injector;

    public static InjectionUtil create(Class scanner,
	    String... packages) {
	Injector startupInjector = Guice.createInjector(StartupModule.create(scanner, packages));
	DynamicModule dynamicModule = startupInjector.getInstance(DynamicModule.class);

	InjectionUtil util = new InjectionUtil();
	util.injector = Guice.createInjector(dynamicModule);

	return util;
    }

    public  T lookup(Class key) {
	return injector.getInstance(key);
    }

    public  T lookup(Class key, String name) {
	return injector.getInstance(Key.get(key, Names.named(name)));
    }

    public  T lookup(Class key, Class annotation) {
	return injector.getInstance(Key.get(key, annotation));
    }
}