tikhomirov@520: /*
tikhomirov@520:  * Copyright (c) 2012 TMate Software Ltd
tikhomirov@520:  *  
tikhomirov@520:  * This program is free software; you can redistribute it and/or modify
tikhomirov@520:  * it under the terms of the GNU General Public License as published by
tikhomirov@520:  * the Free Software Foundation; version 2 of the License.
tikhomirov@520:  *
tikhomirov@520:  * This program is distributed in the hope that it will be useful,
tikhomirov@520:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@520:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@520:  * GNU General Public License for more details.
tikhomirov@520:  *
tikhomirov@520:  * For information on how to redistribute this software under
tikhomirov@520:  * the terms of a license other than GNU General Public License
tikhomirov@520:  * contact TMate Software at support@hg4j.com
tikhomirov@520:  */
tikhomirov@520: package org.tmatesoft.hg.internal;
tikhomirov@520: 
tikhomirov@520: import java.util.ArrayList;
tikhomirov@520: import java.util.HashMap;
tikhomirov@520: import java.util.List;
tikhomirov@520: import java.util.Map;
tikhomirov@520: 
tikhomirov@520: import org.tmatesoft.hg.util.Adaptable;
tikhomirov@520: 
tikhomirov@520: /**
tikhomirov@520:  * Implementation of {@link Adaptable} that allows to add ("plug")
tikhomirov@520:  * adapters as needed
tikhomirov@520:  * 
tikhomirov@520:  * @author Artem Tikhomirov
tikhomirov@520:  * @author TMate Software Ltd.
tikhomirov@520:  */
tikhomirov@520: public class AdapterPlug implements Adaptable {
tikhomirov@520: 	private final Map<Class<?>, Object> adapters = new HashMap<Class<?>, Object>();
tikhomirov@520: 	private final List<Class<?>> adapterUses = new ArrayList<Class<?>>();
tikhomirov@520: 	
tikhomirov@520: 	public <T> void attachAdapter(Class<T> adapterClass, T instance) {
tikhomirov@520: 		adapters.put(adapterClass, instance);
tikhomirov@520: 	}
tikhomirov@520: 
tikhomirov@520: 	public <T> T getAdapter(Class<T> adapterClass) {
tikhomirov@520: 		Object instance = adapters.get(adapterClass);
tikhomirov@520: 		if (instance != null) {
tikhomirov@520: 			adapterUses.add(adapterClass);
tikhomirov@520: 			return adapterClass.cast(instance);
tikhomirov@520: 		}
tikhomirov@520: 		return null;
tikhomirov@520: 	}
tikhomirov@520: 	
tikhomirov@520: 	public int getAdapterUse(Class<?> adapterClass) {
tikhomirov@520: 		int uses = 0;
tikhomirov@520: 		for (Class<?> c : adapterUses) {
tikhomirov@520: 			if (c == adapterClass) {
tikhomirov@520: 				uses++;
tikhomirov@520: 			}
tikhomirov@520: 		}
tikhomirov@520: 		return uses;
tikhomirov@520: 	}
tikhomirov@520: }