/*
 * Copyright 2008 the original author or authors.
 * 
 * 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 org.wamblee.system.adapters;

import org.wamblee.system.core.RequiredInterface;
import org.wamblee.system.core.Scope;

/**
 * Value provider that provides a value through a required interface.
 *  
 * @author Erik Brakkee
 */
public class RequiredInterfaceProvider implements ValueProvider {
	
	private RequiredInterface _required; 
	
	/**
	 * Constructs the provider 
	 * @param aRequired Required interface. 
	 */
	public RequiredInterfaceProvider(RequiredInterface aRequired) { 
		_required = aRequired; 
	}
	
	@Override
	public Object getValue(Scope aScope) {
		return aScope.getInterfaceImplementation(_required.getProvider(), Object.class);
	}
	
	public RequiredInterface getRequiredInterface() {
		return _required;
	}

}