/*
 * Copyright (c) 2000, 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

/*
 * @(#)UserProperties.java	1.7 06/27/07
 */

package com.sun.messaging.jmq.admin.util;

import java.io.*;
import java.util.Properties;
import com.sun.messaging.jmq.admin.resources.AdminResources;

/**
 * This class can be used to save user property files. This class can be subclassed for use in any application requiring
 * loading/saving of user preferences.
 *
 * <P>
 * It has a default directory location of:
 * 
 * <PRE>
 *  &lt;value of user.home property&gt;/.imq/admin
 * </PRE>
 * 
 * and a default file name of "admin.properties".
 *
 * <P>
 * The name of the property file and directory can be configured.
 *
 * <P>
 * If the property file does not exist when a save is attempted, it will be created (including the directory hierarchy).
 */

public class UserProperties extends Properties {
    private static AdminResources ar = Globals.getAdminResources();

    private final static String JMQPREFSROOT = ".imq";
    private final static String JMQADMINROOT = "admin";

    private String fileName, dirName;

    /**
     * Instantiate a UserProperties object.
     */
    public UserProperties() {
        super();

        String userHome = System.getProperty("user.home");

        fileName = "admin.properties";
        dirName = userHome + File.separator + JMQPREFSROOT + File.separator + JMQADMINROOT;
    }

    /**
     * Set save file name. The default for this is "admin.properties"
     *
     * @param fileName The filename to use when saving this property object.
     */
    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    /**
     * Get absolute save file name.
     *
     * @return fileName The absolute path to the file used when saving this property object.
     */
    public String getAbsoluteFileName() {
        String absFileName = dirName + File.separator + fileName;

        return (absFileName);
    }

    /**
     * Set save directory name. The default for this is:
     * 
     * <PRE>
     *  &lt;value of user.home property&gt;/.imq/admin
     * </PRE>
     *
     * @param dirName The directory name to use when saving this property object.
     */
    public void setDirName(String dirName) {
        this.dirName = dirName;
    }

    /**
     * Loads properties from file.
     * <P>
     * This method will load the properties from the file specified via setFileName() or the default if none was specified.
     * The directory used here is the one specified by setDirName() or a default if none was specified.
     */
    public void load() throws UserPropertiesException, SecurityException {
        String absFileName = dirName + File.separator + fileName, errStr;
        File propFile;

        propFile = new File(absFileName);

        if (!propFile.exists()) {
            /*
             * UserPropertiesException upe; errStr = "Property file:\n" + propFile.getAbsolutePath() + "\n" + "does not exist.";
             * 
             * upe = new UserPropertiesException(errStr); throw (upe);
             */
            return;
        }

        if (!propFile.canRead()) {
            UserPropertiesException upe;
            upe = new UserPropertiesException(ar.getString(ar.E_PROPFILE_NOT_READABLE, propFile.getAbsolutePath()));
            throw (upe);
        }

        loadFile(propFile);
    }

    private void loadFile(File propFile) throws UserPropertiesException {
        FileInputStream fis;

        try {
            fis = new FileInputStream(propFile);

            load(fis);
        } catch (Exception ex) {
            UserPropertiesException upe;
            upe = new UserPropertiesException(ar.getString(ar.E_FAILED_TO_OPEN_PROPFILE, propFile.getAbsolutePath(), ex.toString()));
            throw (upe);
        }
    }

    /**
     * Saves properties to file.
     * <P>
     * This method will save the properties to the file specified via setFileName() or the default if none was specified.
     * The directory used here is the one specified by setDirName() or a default if none was specified.
     */
    public void save() throws UserPropertiesException, SecurityException {
        String absFileName = dirName + File.separator + fileName;
        File propDir, propFile;

        propDir = new File(dirName);
        propFile = new File(absFileName);

        if (propFile.exists()) {
            if (!propFile.canWrite()) {
                UserPropertiesException upe;
                upe = new UserPropertiesException(ar.getString(ar.E_PROPFILE_NOT_WRITEABLE, propFile.getAbsolutePath()));

                throw (upe);
            }
        } else {
            if (propDir.exists()) {
                if (!propDir.canWrite()) {
                    UserPropertiesException upe;
                    upe = new UserPropertiesException(ar.getString(ar.E_CANNOT_CREATE_PROPFILE, propFile.getAbsolutePath()));

                    throw (upe);
                }
            } else {
                propDir.mkdirs();
            }
        }

        try {
            FileOutputStream fos = new FileOutputStream(propFile);

            store(fos, null);
        } catch (IOException ioe) {
            UserPropertiesException upe;
            upe = new UserPropertiesException(ar.getString(ar.E_FAILED_TO_WRITE_PROPFILE, propFile.getAbsolutePath(), ioe.toString()));
            throw (upe);
        }
    }
}
