/*
 * 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.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.UUID;


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

	@Override
	public String getName() {
		return _name;
	}
	
	@Override
	public Class[] getInterfaceTypes() {
		return _interfaces;
	}
	
	@Override
	public String getUniqueId() {
		return _uniqueId;
	}
	
	@Override
	public void publish(Object aImplementation, Scope aScope) {
		aScope.publishInterface(this, aImplementation);
	}
	
	@Override
	public String toString() {
		StringBuffer buf = new StringBuffer();
		buf.append(getName());
		buf.append(":");
		for (Class intf: _interfaces) { 
			buf.append(" " + intf.getName());
		}
		return buf.toString();
	}
	
	@Override
	public boolean equals(Object aObj) {
	    if ( !(aObj instanceof DefaultProvidedInterface)) { 
	        return false; 
	    }
	    DefaultProvidedInterface provided = (DefaultProvidedInterface)aObj; 
	    return getEqualsRepresentation().equals(provided.getEqualsRepresentation());
	}
	
	@Override
	public int hashCode() {
	    return getEqualsRepresentation().hashCode();
	}
	
	
	private String getEqualsRepresentation() { 
	    List<String> result = new ArrayList<String>(); 
	    for (Class cls: _interfaces) { 
	        result.add(cls.getName());
	    }
	    Collections.sort(result); 
	    String value = ""; 
	    for (String str: result) { 
	        value += ":" + str; 
	    }
	    return value; 
	}
}