/**
 * 
 * Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
 * 
 * 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.apache.tuscany.core.builder.impl;

import org.apache.tuscany.core.builder.ObjectFactory;
import org.apache.tuscany.core.injection.ObjectCreationException;

import java.lang.reflect.Array;
import java.util.List;

/**
 * Resolves targets configured in a multiplicity by delegating to object factories and returning an
 * <code>Array</code> containing object instances 
 * 
 * @version $Rev$ $Date$
 */
public class ArrayMultiplicityObjectFactory implements ObjectFactory<Object> {

    private ObjectFactory[] factories;

    private Class interfaceType;

    public ArrayMultiplicityObjectFactory(Class interfaceType, List<ObjectFactory> factories) {
        assert (interfaceType != null) : "Interface type was null";
        assert (factories != null) : "Object factories were null";
        this.interfaceType = interfaceType;
        this.factories = factories.toArray(new ObjectFactory[factories.size()]);
    }

    public Object getInstance() throws ObjectCreationException {
        Object array = Array.newInstance(interfaceType, factories.length);
        for (int i = 0; i < factories.length; i++) {
            Array.set(array, i, factories[i].getInstance());
        }
        return array;
    }

}