/*
 * 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.core;

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * A set of interfaces that cannot be changed with useful added functionality. 
 * 
 * @author Erik Brakkee
 *
 * @param <T>
 */
public class ReadOnlyNamedInterfaces<T extends NamedInterface> implements Iterable<T> {

    private Class<T> _type; 
    private List<T> _interfaces; 

    public ReadOnlyNamedInterfaces(Class<T> aType, List<T> aInterfaces) {
        _type = aType; 
        _interfaces = Collections.unmodifiableList(aInterfaces); 
    }
    
    /**
     * @return Number of interfaces. 
     */
    public int size() { 
        return _interfaces.size();
    }
 
    /**
     * Gets the interface at a given index. 
     * @param aIndex Index of the interface to return. 
     * @return Interface.
     */
    public T get(int aIndex) { 
        return _interfaces.get(aIndex);
    }
    
    /**
     * Gets the interface with a specific name. 
     * @param aName Interface name. 
     * @return Interface. 
     */
    public T get(String aName) { 
        for (T intf: _interfaces) { 
            if ( intf.getName().equals(aName)) { 
                return intf; 
            }
        }
        return null; 
    }
    
    @Override
    public Iterator<T> iterator() {
        return _interfaces.iterator();
    }
    
    /**
     * Converts the interfaces to an array. 
     * @return List of interfaces in an array. 
     */
    public T[] toArray() { 
        T[] storage = (T[])Array.newInstance(_type, _interfaces.size());
        return _interfaces.toArray(storage);
    }
}