/*
 * Copyright 2007 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.core;

import java.util.Arrays;

/**
 * Default implementation of a service descriptor.
 *
 * @author Erik Brakkee
 */
public class DefaultProvidedInterface implements ProvidedInterface {
	
	private String _name; 
	private Class[] _interfaces;
	private Object _implementation; 
	
	/**
	 * Constructs the descriptor. 
	 * @param aInterface Type of service. 
	 */
	public DefaultProvidedInterface(String aName, Class aInterface) {
		_name = aName; 
		_interfaces = new Class[] { aInterface };  
	}
	
	public DefaultProvidedInterface(String aName, Class[] aInterfaces) {
		_name = aName; 
		_interfaces = Arrays.copyOf(aInterfaces, aInterfaces.length);  
	}

	@Override
	public String getName() {
		return _name;
	}
	
	@Override
	public Class[] getInterfaceTypes() {
		return _interfaces;
	}
	
	@Override
	public void publish(Object aImplementation) {
		_implementation = aImplementation; 	
	}
	
	@Override
	public Object getImplementation() {
		return _implementation; 
	}
	
	@Override
	public boolean equals(Object obj) {
		if ( !(obj instanceof DefaultProvidedInterface)) { 
			return false; 
		}
		DefaultProvidedInterface descr = (DefaultProvidedInterface)obj;
		if ( _interfaces.length != descr._interfaces.length ) { 
			return false; 
		}
		String[] interfaces1 = new String[_interfaces.length];
		String[] interfaces2 = new String[_interfaces.length];
		for (int i = 0; i < _interfaces.length; i++) {  
			interfaces1[i] = _interfaces[i].getName();
			interfaces2[i] = descr._interfaces[i].getName();
		}
		Arrays.sort(interfaces1);
		Arrays.sort(interfaces2);
		return Arrays.equals(interfaces1, interfaces2);
	}

	@Override
	public int hashCode() {
		return _interfaces.hashCode(); 
	}
	
	@Override
	public String toString() {
		StringBuffer buf = new StringBuffer();
		for (Class intf: _interfaces) { 
			buf.append("." + intf.getName());
		}
		return buf.toString();
	}
}