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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.factory.object;

import be.objectify.led.FactoryResolver;
import be.objectify.led.ObjectFactory;
import be.objectify.led.PropertyContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.util.Collection;
import java.util.Set;

/**
 * @author Steve Chaloner
 */
public abstract class SetFactory extends AbstractObjectFactory
{
    private static final Logger LOGGER = LoggerFactory.getLogger(SetFactory.class);

    private final Class clazz;

    private final Field field;

    private final FactoryResolver factoryResolver;

    public SetFactory(Class clazz,
                       Field field,
                       FactoryResolver factoryResolver)
    {
        this.clazz = clazz;
        this.field = field;
        this.factoryResolver = factoryResolver;
    }

    public Set createObject(String propertyName,
                               String propertyValue,
                               PropertyContext propertyContext)
    {
        Set set = createSet();
        ObjectFactory objectFactory = factoryResolver.resolveFactory(clazz,
                                                                     field);
        if (objectFactory == null)
        {
            LOGGER.info("No factory available for type [{}]",
                        clazz.getCanonicalName());
        }
        else
        {
            Collection values = parse(propertyName,
                                         propertyValue,
                                         propertyContext,
                                         objectFactory);
            if (values != null)
            {
                set.addAll(values);
            }
            else
            {
                LOGGER.info("Property value [{}] did not parse into collection of type [{}]",
                            propertyValue,
                            clazz.getCanonicalName());
            }
        }

        return set;
    }

    public Class getBoundClass()
    {
        return Set.class;
    }

    protected abstract Collection parse(String propertyName,
                                           String propertyValue,
                                           PropertyContext propertyContext,
                                           ObjectFactory objectFactory);

    protected abstract Set createSet();
}