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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.Map;

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

    private final Class keyClass;

    private final Class valueClass;

    private final Field field;

    private final FactoryResolver factoryResolver;

    public MapFactory(Class keyClass,
                      Class valueClass,
                      Field field,
                      FactoryResolver factoryResolver)
    {
        this.keyClass = keyClass;
        this.valueClass = valueClass;
        this.field = field;
        this.factoryResolver = factoryResolver;
    }

    public Map createObject(String propertyName,
                                  String propertyValue,
                                  PropertyContext propertyContext)
    {
        Map map = createMap();
        ObjectFactory keyObjectFactory = factoryResolver.resolveFactory(keyClass,
                                                                        field);
        ObjectFactory valueObjectFactory = factoryResolver.resolveFactory(valueClass,
                                                                          field);
        if (keyObjectFactory == null || valueObjectFactory == null)
        {
            LOGGER.info("No factory available for map: key factory [{}]   value factory [{}]",
                        keyClass.getCanonicalName(),
                        valueClass.getCanonicalName());
        }
        else
        {
            Map values = parse(propertyName,
                                     propertyValue,
                                     propertyContext,
                                     keyObjectFactory,
                                     valueObjectFactory);
            if (values != null)
            {
                map.putAll(values);
            }
            else
            {
                LOGGER.info("Property value [{}] did not parse into map of type [{}][{}]",
                            new Object[]{
                                    propertyValue,
                                    keyClass.getCanonicalName(),
                                    valueClass.getCanonicalName()});
            }
        }

        return map;
    }

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

    protected abstract Map parse(String propertyName,
                                       String propertyValue,
                                       PropertyContext propertyContext,
                                       ObjectFactory keyObjectFactory,
                                       ObjectFactory valueObjectFactory);

    protected abstract Map createMap();
}