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objectify-led is a small Java library for binding object or class properties at runtime using annotations, reducing boilerplate code. Values can be taken from the System, from properties files, any arbitrary source in fact, and automatically set on properties.

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/*
 * Copyright 2009-2010 Steve Chaloner
 *
 * 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 be.objectify.led;

import java.lang.reflect.Field;

/**
 * Resolves {@link ObjectFactory} instances through checking for an {@link ObjectFactory} for the required class,
 * followed by a {@link TypeFactory} if no object factory is defined.
 *
 * @author Steve Chaloner
 * @version , 
 */
public class DefaultFactoryResolver implements FactoryResolver
{
    private final ObjectFactoryRegistry objectFactoryRegistry;

    private final TypeFactoryRegistry typeFactoryRegistry;

    public DefaultFactoryResolver()
    {
        this(new ObjectFactoryRegistry(),
             new TypeFactoryRegistry());
    }

    public DefaultFactoryResolver(ObjectFactoryRegistry objectFactoryRegistry)
    {
        this(objectFactoryRegistry,
             new TypeFactoryRegistry());
    }

    public DefaultFactoryResolver(TypeFactoryRegistry typeFactoryRegistry)
    {
        this(new ObjectFactoryRegistry(),
             typeFactoryRegistry);
    }

    public DefaultFactoryResolver(ObjectFactoryRegistry objectFactoryRegistry,
                                  TypeFactoryRegistry typeFactoryRegistry)
    {
        this.objectFactoryRegistry = objectFactoryRegistry;
        this.typeFactoryRegistry = typeFactoryRegistry;
    }

    public ObjectFactory resolveFactory(Class type,
                                        Field field)
    {
        ObjectFactory objectFactory = objectFactoryRegistry.getFactory(type);
        if (objectFactory == null)
        {
            GenericTypes genericTypes = field.getAnnotation(GenericTypes.class);
            TypeFactory factory = typeFactoryRegistry.getFactory(type);
            if (factory != null)
            {
                objectFactory = factory.createObjectFactory(factory.determineClassType(type,
                                                                                       genericTypes),
                                                            field);
            }
        }

        return objectFactory;
    }
}