org.odlabs.wiquery.core.commons.WiQueryInitializer.java Source code

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Here is the source code for org.odlabs.wiquery.core.commons.WiQueryInitializer.java

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/*
 * Copyright (c) 2009 WiQuery team
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.odlabs.wiquery.core.commons;

import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import org.apache.wicket.Application;
import org.apache.wicket.IInitializer;
import org.apache.wicket.MetaDataKey;
import org.apache.wicket.util.lang.Objects;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * $Id: WiQueryInitializer.java 563 2010-11-21 20:50:37Z roche.jul@gmail.com $
 * 
 * <p>
 * {@link IInitializer} to retrieve settings for wiQuery
 * </p>
 * 
 * @author Julien Roche
 * @since 1.1
 */
public class WiQueryInitializer implements IInitializer {
    /**
     * Meta data for {@link WiQueryInstantiationListener}.
     */
    public static final MetaDataKey<WiQuerySettings> WIQUERY_INSTANCE_KEY = new MetaDataKey<WiQuerySettings>() {
        private static final long serialVersionUID = 1L;
    };

    /** Logger */
    private static final Logger LOGGER = LoggerFactory.getLogger(WiQueryInitializer.class);

    /**
     * {@inheritDoc}
     * 
     * @see org.apache.wicket.IInitializer#init(org.apache.wicket.Application)
     */
    public void init(Application application) {
        application.addPostComponentOnBeforeRenderListener(new WiQueryRenderingListener());

        // check for IWiQuerySettings on the application
        WiQuerySettings settings = application instanceof IWiQuerySettings
                ? ((IWiQuerySettings) application).getWiQuerySettings()
                : null;
        application.setMetaData(WIQUERY_INSTANCE_KEY, settings == null ? new WiQuerySettings() : settings);

        // IWiQueryInitializer treatments
        retrieveAndCallInitializers(application, settings);
    }

    private IWiQueryInitializer getIWiQueryInitializer(String className) {
        if (className == null) {
            return null;
        }

        return (IWiQueryInitializer) Objects.newInstance(className);
    }

    /**
     * Method finding and calling the {@link IWiQueryInitializer}
     */
    private void retrieveAndCallInitializers(Application application, WiQuerySettings wiQuerySettings) {
        InputStream in = null;
        Iterator<URL> resources = null;
        IWiQueryInitializer wiQueryInitializer;
        List<IWiQueryInitializer> initializers = new ArrayList<IWiQueryInitializer>();
        Properties properties = null;
        URL url = null;

        try {
            resources = application.getApplicationSettings().getClassResolver().getResources("wiquery.properties");
            while (resources.hasNext()) {
                try {
                    url = resources.next();
                    LOGGER.info("Find the wiQuery initializer:", url.toString());

                    properties = new Properties();
                    in = url.openStream();
                    properties.load(in);

                    wiQueryInitializer = getIWiQueryInitializer(properties.getProperty("initializer"));

                    if (wiQueryInitializer != null) {
                        initializers.add(wiQueryInitializer);
                    }

                    wiQueryInitializer = getIWiQueryInitializer(
                            properties.getProperty(application.getName() + "-initializer"));

                    if (wiQueryInitializer != null) {
                        initializers.add(wiQueryInitializer);
                    }

                } finally {
                    if (in != null) {
                        in.close();
                    }
                }
            }
        } catch (Exception e) {
            LOGGER.error("Unable to load initializers file", e);
        }

        if (initializers.size() > 0) {
            for (IWiQueryInitializer initializer : initializers) {
                LOGGER.info("[" + application.getName() + "] init: " + initializer);
                initializer.init(application, wiQuerySettings);
            }
        }
    }
}