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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
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// Portions Copyright 2024 Payara Foundation and/or its affiliates

package org.glassfish.persistence.common.database;

import com.sun.logging.LogDomains;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.persistence.common.I18NHelper;

/** 
 * @author Mitesh Meswani
 * This class provides helper to load reources into property object.
 *
 */
public class PropertyHelper {

    /** The logger */
    private final static Logger logger = LogDomains.getLogger(
            PropertyHelper.class, LogDomains.JDO_LOGGER);

    /** I18N message handler */
    private final static ResourceBundle messages = I18NHelper.loadBundle(
        "org.glassfish.persistence.common.LogStrings", //NOI18N
         PropertyHelper.class.getClassLoader());

    /**
     * Loads properties list from the specified resource into specified Properties object.
     * @param properties    Properties object to load
     * @param resourceName  Name of resource.
     * @param classLoader   The class loader that should be used to load the resource. If null,primordial
     *                      class loader is used.
     */
    public static void loadFromResource(Properties properties, String resourceName, ClassLoader classLoader)
            throws IOException {
        load(properties, resourceName, false, classLoader);
    }


    /**
     * Loads properties list from the specified file into specified Properties object.
     * @param properties    Properties object to load
     * @param fileName      Fully qualified path name to the file.
     */
    public static void loadFromFile(Properties properties, String fileName)
            throws IOException {
        load(properties, fileName, true, null);
    }

    /**
     * Loads properties list from the specified resource
     * into specified Properties object.
     * @param resourceName	Name of resource. 
     *                      If loadFromFile  is true, this is fully qualified path name to a file.
     *                      param classLoader is ignored.
     *                      If loadFromFile  is false,this is resource name. 
     * @param classLoader   The class loader that should be used to load the resource. If null,primordial
     *                      class loader is used.
     * @param properties	Properties object to load
     * @param loadFromFile  true if resourcename is to be treated as file name.
     */
    private static void load(Properties properties, final String resourceName,
                            final boolean loadFromFile, final ClassLoader classLoader)
                            throws IOException {

        InputStream bin = null;
        InputStream in = null;
        boolean debug = logger.isLoggable(Level.FINE);

        if (debug) {
            Object[] items = new Object[] {resourceName,Boolean.valueOf(loadFromFile)};
            logger.log(Level.FINE, I18NHelper.getMessage(
                    messages, "database.PropertyHelper.load",items)); // NOI18N
        }

        in =  loadFromFile ? openFileInputStream(resourceName) : 
                                openResourceInputStream(resourceName,classLoader);
        if (in == null) {
            throw new IOException(I18NHelper.getMessage(messages,
                    "database.PropertyHelper.failedToLoadResource", resourceName));// NOI18N
        }
        bin = new BufferedInputStream(in);
        try {
            properties.load(bin);
        } finally {
            try {
                bin.close();
            } catch (Exception e) {
                // no action
            }
        }
    }
    
    /**
     * Open fileName as input stream inside doPriviledged block
     */
    private static InputStream openFileInputStream(final String fileName) throws java.io.FileNotFoundException {
        return new FileInputStream(fileName);
    }

    /**
     * Open resourcenName as input stream inside doPriviledged block
     */
    private static InputStream openResourceInputStream(final String resourceName, final ClassLoader classLoader)
            throws FileNotFoundException {
        if (classLoader != null) {
            return classLoader.getResourceAsStream(resourceName);
        }

        return ClassLoader.getSystemResourceAsStream(resourceName);
    }

}