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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.PropertyContext;
import be.objectify.led.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Abstract class for parsing numbers from Strings.
 * 
 * @author Steve Chaloner
 */
public abstract class AbstractNumberFactory extends AbstractObjectFactory
{
    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractNumberFactory.class);

    /**
     * {@inheritDoc}
     */
    public T createObject(String propertyName,
                          String propertyValue,
                          PropertyContext propertyContext)
    {
        T t = null;

        if (!StringUtils.isEmpty(propertyValue))
        {
            try
            {
                t = parse(propertyValue);
            }
            catch (NumberFormatException e)
            {
                LOGGER.error("Unable to parse [{}] to number",
                             propertyValue,
                             e);
            }
        }

        return t;
    }

    /**
     * Parse the property value to extract an object of the correct type from it.
     * 
     * @param propertyValue the source value.  Must not be null
     * @return the parsed value
     */
    protected abstract T parse(String propertyValue);
}