/*
 * Copyright 2005-2010 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;

/**
 * Default implementation of a service descriptor.
 * 
 * @author Erik Brakkee
 */
public class DefaultProvidedInterface implements ProvidedInterface {
    private String name;

    private Class[] interfaces;

    /**
     * Constructs the descriptor.
     * 
     * @param aInterface
     *            Type of service.
     */
    public DefaultProvidedInterface(String aName, Class aInterface) {
        this(aName, new Class[] { aInterface });
    }

    /**
     * Creates a new DefaultProvidedInterface object.
     * 
     */
    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 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) {
        return this == aObj;

        /*
         * if ( !(aObj instanceof DefaultProvidedInterface)) { return false; }
         * DefaultProvidedInterface provided = (DefaultProvidedInterface)aObj;
         * return
         * getEqualsRepresentation().equals(provided.getEqualsRepresentation());
         */
    }

    @Override
    public int hashCode() {
        return getEqualsRepresentation().hashCode();
    }

    @Override
    public boolean covers(ProvidedInterface aInterface) {
        // TODO do more than just equals.
        if (!(aInterface instanceof DefaultProvidedInterface)) {
            return false;
        }

        return getEqualsRepresentation().equals(
            ((DefaultProvidedInterface) aInterface).getEqualsRepresentation());
    }

    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;
    }
}