ExplicitInjectors.java

package com.lonepulse.icklebot.injector.explicit;

/*
 * #%L
 * IckleBot
 * %%
 * Copyright (C) 2013 Lonepulse
 * %%
 * 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.
 * #L%
 */

import android.app.Activity;
import android.app.Application;
import android.util.Log;

import com.lonepulse.icklebot.injector.InjectionException;
import com.lonepulse.icklebot.injector.Injector;

/**
 * <p>Maintains a set of {@link Injector} <i>singletons</i> which are used 
 * by any {@link Activity} which implements the {@link Activity}.</p>
 * 
 * @version 1.1.1
 * <br><br>
 * @author <a href="mailto:lahiru@lonepulse.com">Lahiru Sahan Jayasinghe</a>
 */
public enum ExplicitInjectors implements Injector {

	/**
	 * <p>This {@link Injector} is responsible for injecting the 
	 * <i>configuration</i> of an {@link Activity}.</p>
	 * 
	 * @since 1.0.0
	 */
	CONFIGURATION(new ExplicitConfigurationInjector()),
	
	/**
	 * <p>This {@link Injector} is responsible for injecting the 
	 * {@link Application} instance.</p>
	 * 
	 * <p>Injection will succeed with a custom {@link Application} 
	 * extension as well; for example:</p>
	 * 
	 * <pre>@InjectApplication<br>MyApplication myApplication;</pre>
	 * 
	 * @since 1.0.0
	 */
	APPLICATION(new ExplicitApplicationInjector()),
	
	/**
	 * <p>This {@link Injector} is responsible for injecting the 
	 * <i>layout</i> of an {@link Activity}.</p>
	 * 
	 * @since 1.0.0
	 */
	LAYOUT(new ExplicitLayoutInjector()),
	
	/**
	 * <p>This {@link Injector} is responsible for injecting the 
	 * <i>resources</i> of an {@link Activity}.</p>
	 * 
	 * @since 1.0.0
	 */
	RESOURCES(new ExplicitResourceInjector()),
	
	/**
	 * <p>This {@link Injector} is responsible for injecting any 
	 * <i>System Services</i> in an {@link Activity}.</p>
	 * 
	 * @since 1.0.0
	 */
	SYSTEM_SERVICES(new ExplicitSystemServiceInjector()),
	
	/**
	 * <p>This {@link Injector} is responsible for injecting any 
	 * <i>Ickle Services</i> in an {@link Activity}.</p>
	 * 
	 * @since 1.1.1
	 */
	ICKLE_SERVICES(new ExplicitIckleServiceInjector()),
	
	/**
	 * <p>This {@link Injector} is responsible for injecting any 
	 * <i>POJOs</i> in an {@link Activity}.</p>
	 * 
	 * @since 1.0.0
	 */
	POJOS(new ExplicitPojoInjector());
	
	
	/**
	 * <p>The wrapped {@link Injector} <i>singleton</i>.</p>
	 * 
	 * @since 1.0.0
	 */
	private Injector injector;
	
	/**
	 * <p>A parameterized constructor which initializes the 
	 * {@link #injector}.</p>
	 * 
	 * @param injector
	 * 			populates {@link #injector}
	 * <br><br>
	 * @since 1.0.0
	 */
	private ExplicitInjectors(Injector injector) {
		
		this.injector = injector;
	}

	/**
	 * <p>Delegate for invoking the {@link #injector}'s 
	 * {@link Injector#inject(com.lonepulse.icklebot.injector.Injector.Configuration))} 
	 * service.</p>
	 * 
	 * @since 1.0.0
	 */
	@Override
	public void inject(Configuration config) throws InjectionException {
		
		try {
			
			injector.inject(config);
		}
		catch(Exception e) {
			
			StringBuilder stringBuilder = new StringBuilder();
			
			stringBuilder.append("Injection using ");
			stringBuilder.append(injector.getClass().getName());
			stringBuilder.append(" failed on activity ");
			stringBuilder.append(config.getContext().getClass().getName());
			stringBuilder.append(". ");
			
			Log.e(getClass().getName(), stringBuilder.toString(), e);
		}
	}
}