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

import java.util.Properties;

/**
 * Default implementation of {@link PropertyContext} which
 *
 * @author Steve Chaloner
 */
public class DefaultPropertyContext implements PropertyContext
{
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultPropertyContext.class);

    private final Properties properties = new Properties();

    public DefaultPropertyContext(Properties... properties)
    {
        ContractUtils.nonNull(properties, "properties");

        for (Properties propertiesInstance : properties)
        {
            this.properties.putAll(propertiesInstance);
        }
    }

    /** {@inheritDoc} */
    public String getValue(String propertyName)
    {
        String value = null;

        if (properties.containsKey(propertyName))
        {
            value = properties.getProperty(propertyName);
        }

        String property = System.getProperty(propertyName);
        if (!StringUtils.isEmpty(property))
        {
            value = property;
        }

        if (value != null)
        {
            LOGGER.debug("Found value [{}] for property [{}]",
                         value,
                         propertyName);
        }

        return value;
    }
}