com.slytechs.utils.factory.FactoryLoader.java Source code

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Here is the source code for com.slytechs.utils.factory.FactoryLoader.java

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/**
 * Copyright (C) 2007 Sly Technologies, Inc. This library is free software; you
 * can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version. This
 * library is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details. You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
package com.slytechs.utils.factory;

import java.util.Formatter;

import org.apache.commons.logging.Log;

/**
 * @author Mark Bednarczyk
 * @author Sly Technologies, Inc.
 */
public class FactoryLoader<T> {

    private final Log logger;

    private final String property;

    private final String defaults;

    private T factory;

    /**
    * @param logger TODO
     * @param property
     * @param defaults
    */
    public FactoryLoader(Log logger, final String property, final String defaults) {
        this.logger = logger;
        this.property = property;
        this.defaults = defaults;

        loadFactoryClass();
    }

    @SuppressWarnings("unchecked")
    public void loadFactoryClass() {
        String path = System.getProperty(property, defaults);

        try {
            factory = (T) Class.forName(path).newInstance();

        } catch (final Exception e) {

            final Formatter out = new Formatter();

            logger.error(out.format("Unable to load factory class [%s]", path).toString());

            //         throw new IllegalStateException(e);
        }
    }

    public T getFactory() {
        return factory;
    }

}