Metacat

/**

 *  '$RCSfile$'

 *    Purpose: A Class that implements properties methods for metacat

 *             skins

 *  Copyright: 2008 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Michael Daigle

 *

 *   '$Author: daigle $'

 *     '$Date: 2008-10-09 09:53:18 -0700 (Thu, 09 Oct 2008) $'

 * '$Revision: 4429 $'

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.service;

import java.io.IOException;

import java.util.HashMap;

import java.util.Set;

import java.util.Vector;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.xml.transform.TransformerException;

import org.apache.log4j.Logger;

import edu.ucsb.nceas.metacat.util.SkinUtil;

import edu.ucsb.nceas.metacat.util.UtilException;

import edu.ucsb.nceas.utilities.FileUtil;

import edu.ucsb.nceas.utilities.GeneralPropertyException;

import edu.ucsb.nceas.utilities.PropertiesMetaData;

import edu.ucsb.nceas.utilities.PropertyNotFoundException;

import edu.ucsb.nceas.utilities.SortedProperties;

/**

 * A suite of utility classes for the skin configuration utility

 */

public class SkinPropertyService implements ServiceInterface {

	private static SkinPropertyService skinService = null;

	private static boolean bypassAlreadyChecked = false;

	private static String SKIN_DIR = null;

	private static String BACKUP_DIR = null;

	private static Vector<String> skinNames = null;

	private static HashMap<String, SortedProperties> skinPropertiesMap = null;	

	private static HashMap<String, SortedProperties> skinBackupPropertiesMap = null;

	private static HashMap<String, PropertiesMetaData> skinMetaDataMap = null;

	private static Logger logMetacat = Logger.getLogger(SkinPropertyService.class);

	/**

	 * private constructor since this is a singleton

	 * 

	 * @param servletContext the context we will use to get relative paths

	 */

	private SkinPropertyService(ServletContext servletContext) throws ServiceException {

		try {

			initialize(servletContext);

		} catch (GeneralPropertyException gpe) {

			throw new ServiceException(

					"Properties problem while initializing PropertyService: "

							+ gpe.getMessage());

		} catch (IOException ioe) {

			throw new ServiceException("I/O Problem while initializing PropertyService: "

					+ ioe.getMessage());

		}

	}

	/**

	 * Get the single instance of SkinPropertyService.

	 * 

	 * @param servletContext the context we will use to get relative paths

	 * @return the single instance of SkinPropertyService

	 */

	public static SkinPropertyService getInstance(ServletContext servletContext) throws ServiceException {

		if (skinService == null) {

			skinService = new SkinPropertyService(servletContext);

		}

		return skinService;

	}

	/**

	 * Initialize the singleton.

	 * 

	 * @param servletContext

	 *            the context we will use to get relative paths

	 */

	private void initialize(ServletContext servletContext) throws IOException,

			GeneralPropertyException {

		logMetacat.debug("Initializing SkinService");

		SKIN_DIR = "/style/skins";

		BACKUP_DIR = PropertyService.getBackupDir();

		skinNames = SkinUtil.getSkinNames();

		skinPropertiesMap = new HashMap<String, SortedProperties>();

		skinBackupPropertiesMap = new HashMap<String, SortedProperties>();

		skinMetaDataMap = new HashMap<String, PropertiesMetaData>();

		try {

			for (String skinName : skinNames) {

				String propertyFilePath = servletContext.getRealPath(SKIN_DIR)

						+ FileUtil.getFS() + skinName + FileUtil.getFS() + skinName

						+ ".properties";

				SortedProperties skinProperties = new SortedProperties(propertyFilePath);

				skinProperties.load();

				skinPropertiesMap.put(skinName, skinProperties);

				String metaDataFilePath = servletContext.getRealPath(SKIN_DIR)

						+ FileUtil.getFS() + skinName + FileUtil.getFS() + skinName

						+ ".properties.metadata.xml";

				PropertiesMetaData skinMetaData = new PropertiesMetaData(metaDataFilePath);

				skinMetaDataMap.put(skinName, skinMetaData);

				String backupPropertyFilePath = 

					BACKUP_DIR + FileUtil.getFS() + skinName + ".properties.backup";

				SortedProperties skinBackupProperties = 

					new SortedProperties(backupPropertyFilePath);

				skinBackupProperties.load();

				skinBackupPropertiesMap.put(skinName, skinBackupProperties);

			}

		} catch (TransformerException te) {

			throw new GeneralPropertyException(te.getMessage());

		}

	}

	/**

	 * Utility method to get a property value from the properties file for

	 * a specific skin.

	 * 

	 * @param skinName the skin for which we want to retrieve the property

	 * @param propertyName

	 *            the name of the property requested

	 * @return the String value for the property

	 */

	public static String getProperty(String skinName, String propertyName)

			throws PropertyNotFoundException {

		SortedProperties skinProperties = skinPropertiesMap.get(skinName);

		if (skinProperties == null) {

			throw new PropertyNotFoundException("There is not property map for " + skinName);

		}

		return skinProperties.getProperty(propertyName);

	}

	/**

     * Get a set of all property names for a given skin.

     * 

     * @param skinName the skin for which we want to retrieve the property

     * names

     * @return Set of property names  

     */

    public static Vector<String> getPropertyNames(String skinName) throws PropertyNotFoundException {   

		SortedProperties skinProperties = skinPropertiesMap.get(skinName);

		if (skinProperties == null) {

			throw new PropertyNotFoundException("There is not property map for " + skinName);

		}

    	return skinProperties.getPropertyNames();

    }

	/**

	 * Get a Set of all property names that start with the groupName prefix.

	 * 

	 * @param groupName

	 *            the prefix of the keys to search for.

	 * @return Vector of property names

	 */

    public static Vector<String> getPropertyNamesByGroup(String skinName, String groupName) throws PropertyNotFoundException {  

		SortedProperties skinProperties = skinPropertiesMap.get(skinName);

		if (skinProperties == null) {

			throw new PropertyNotFoundException("There is not property map for " + skinName);

		}

    	return skinProperties.getPropertyNamesByGroup(groupName);

    }

	/**

	 * Get the main backup properties file. These are configurable properties that

	 * are stored outside the metacat install directories so the user does not

	 * need to re-enter all the configuration information every time they do an

	 * upgrade.

	 * 

	 * @return a SortedProperties object with the backup properties

	 */

	public static HashMap<String, SortedProperties> getProperties() {

		return skinPropertiesMap;

	}

	/**

	 * Get the main backup properties file. These are configurable properties that

	 * are stored outside the metacat install directories so the user does not

	 * need to re-enter all the configuration information every time they do an

	 * upgrade.

	 * 

	 * @return a SortedProperties object with the backup properties

	 */

	public static SortedProperties getProperties(String skinName) {

		return skinPropertiesMap.get(skinName);

	}

	/**

	 * Get the main backup properties file. These are configurable properties that

	 * are stored outside the metacat install directories so the user does not

	 * need to re-enter all the configuration information every time they do an

	 * upgrade.

	 * 

	 * @return a SortedProperties object with the backup properties

	 */

	public static HashMap<String, SortedProperties> getBackupProperties() {

		return skinBackupPropertiesMap;

	}

	/**

	 * Get the main backup properties file. These are configurable properties that

	 * are stored outside the metacat install directories so the user does not

	 * need to re-enter all the configuration information every time they do an

	 * upgrade.

	 * 

	 * @return a SortedProperties object with the backup properties

	 */

	public static SortedProperties getBackupProperties(String skinName) {

		return skinBackupPropertiesMap.get(skinName);

	}

	/**

	 * Get the main properties metadata. This is retrieved from an xml file that

	 * describes the attributes of configurable properties.

	 * 

	 * @return a PropertiesMetaData object with the main properties metadata

	 */

	public static HashMap<String, PropertiesMetaData> getMetaData() {

		return skinMetaDataMap;

	}

	/**

	 * Get the main properties metadata. This is retrieved from an xml file that

	 * describes the attributes of configurable properties.

	 * 

	 * @return a PropertiesMetaData object with the main properties metadata

	 */

	public static PropertiesMetaData getMetaData(String skinName) {

		return skinMetaDataMap.get(skinName);

	}

	/**

	 * Utility method to set a property value both in memory and to the

	 * properties file

	 * 

	 * @param propertyName

	 *            the name of the property requested

	 * @param newValue

	 *            the new value for the property

	 */

	public static void setProperty(String skinName, String propertyName, String newValue) throws IOException, GeneralPropertyException {

		SortedProperties skinProperties = skinPropertiesMap.get(skinName);

		if (skinProperties == null) {

			throw new GeneralPropertyException("There is not property map for " + skinName);

		}

		skinProperties.setProperty(propertyName, newValue);

		skinProperties.store();

	}

	/**

	 * Utility method to set a property value in memory. This will NOT cause the

	 * property to be written to disk. Use this method to set multiple

	 * properties in a row without causing excessive I/O. You must call

	 * persistProperties() once you're done setting properties to have them

	 * written to disk.

	 * 

	 * @param propertyName

	 *            the name of the property requested

	 * @param newValue

	 *            the new value for the property

	 */

	public static void setPropertyNoPersist(String skinName, String propertyName, String newValue) throws GeneralPropertyException {

		SortedProperties skinProperties = skinPropertiesMap.get(skinName);

		if (skinProperties == null) {

			throw new GeneralPropertyException("There is not property map for " + skinName);

		}

		skinProperties.setPropertyNoPersist(propertyName, newValue);

	}

	/**

	 * Save the properties to a properties file. Note, the 

	 * order and comments will be preserved.

	 */

	public static void persistProperties(String skinName) throws IOException, GeneralPropertyException {

		SortedProperties skinProperties = skinPropertiesMap.get(skinName);

		if (skinProperties == null) {

			throw new GeneralPropertyException("There is not property map for " + skinName);

		}

		skinProperties.store();

	}

	/**

	 * Save the properties to a properties file. Note, the order and comments

	 * will be preserved.

	 */

	public static void persistAllProperties() throws IOException,

			GeneralPropertyException {

		for (String skinName : skinNames) {

			persistProperties(skinName);

		}

	}

	/**

	 * Writes out backup configurable properties to a file.

	 */

	public static void persistBackupProperties(String skinName, ServletContext servletContext)

			throws GeneralPropertyException {

		String metaDataFilePath = servletContext.getRealPath(SKIN_DIR) + FileUtil.getFS()

				+ skinName + FileUtil.getFS() + skinName + ".properties.metadata.xml";

		String backupPropertyFilePath = 

			BACKUP_DIR + FileUtil.getFS() + skinName + ".properties.backup";

		// Use the metadata to extract configurable properties from the 

		// overall properties list, and store those properties.

		try {

			SortedProperties backupProperties = 

				new SortedProperties(backupPropertyFilePath);

			// Populate the backup properties for main metacat properties using

			// the associated metadata file

			PropertiesMetaData mainMetadata = new PropertiesMetaData(metaDataFilePath);

			Set<String> mainKeySet = mainMetadata.getKeys();

			for (String propertyKey : mainKeySet) {

				backupProperties.addProperty(propertyKey, getProperty(skinName, propertyKey));

			}

			// store the properties to file

			backupProperties.store();

		} catch (TransformerException te) {

			throw new GeneralPropertyException("Could not transform backup properties xml: "

					+ te.getMessage());

		} catch (IOException ioe) {

			throw new GeneralPropertyException("Could not backup configurable properties: "

					+ ioe.getMessage());

		}

	}

	/**

	 * Gets the backup properties directory

	 * 

	 * TODO MCD figure out how to expand this.  At least for Windows

	 * 

	 * @return a string which holds the name of the backup directory. returns

	 *         null if directory could not be created.

	 */

	public static String getBackupDir() {

		return "/var/metacat/.metacat";

	}

	/**

	 * Reports whether properties are fully configured.

	 * 

	 * @return a boolean that is true if properties are not unconfigured and

	 *         false otherwise

	 */

	public static boolean areSkinsConfigured() throws UtilException {

		try {

			return !PropertyService.getProperty("configutil.skinsConfigured").equals(

					PropertyService.UNCONFIGURED);

		} catch (PropertyNotFoundException pnfe) {

			throw new UtilException("Could not determine if skins are configured: "

					+ pnfe.getMessage());

		}

	}

	/**

	 * Take input from the user in an HTTP request about an property to be changed

	 * and update the metacat property file with that new value if it has

	 * changed from the value that was originally set.

	 * 

	 * @param request

	 *            that was generated by the user

	 * @param response

	 *            to send output back to the user

	 * @param propertyName

	 *            the name of the property to be checked and set

	 */

	public static void checkAndSetProperty(HttpServletRequest request, String skinName, String propertyName) 

			throws GeneralPropertyException {

		String newValue = request.getParameter(skinName + "." + propertyName);

		checkAndSetProperty(newValue, skinName, propertyName); 

	}

	/**

	 * Check user input against existing value

	 * and update the metacat property file with that new value if it has

	 * changed from the value that was originally set.

	 * 

	 * @param newValue

	 *            the value that was returned by the form

	 * @param skinname

	 *            the skin that we are checking

	 * @param propertyName

	 *            the name of the property to be checked and set

	 */

	public static void checkAndSetProperty(String newValue, String skinName, String propertyName) 

			throws GeneralPropertyException {

		String oldValue = SkinPropertyService.getProperty(skinName, propertyName);

		if (newValue != null && !newValue.equals(oldValue)) {

			SkinPropertyService.setPropertyNoPersist(skinName, propertyName, newValue);

		}

	}

	/**

	 * Reports whether the metacat configuration utility should be run.  

	 * Returns false if  

	 *   -- dev.runConfiguration=false and

	 *   -- backup properties file exists

	 * Note that dev.runConfiguration should only be set to false when

	 * reinstalling the same version of the application in developement.

	 * 

	 * @return a boolean that is false if dev.runConfiguration is false and 

	 * the backup properties file exists.  

	 */

	public static boolean bypassConfiguration() {

		boolean bypass = false;

		// We only want to go through the check once to see if we want to

		// bypass the configuration.  We don't want to run through all of

		// this every time  we hit metacat. 

		if (bypassAlreadyChecked) {

			return bypass;

		}

		try {		

			// check how dev.runConfiguration is set in metacat.properties

			String strRunConfiguration = PropertyService.getProperty("dev.runConfiguration");

			bypass = !(Boolean.parseBoolean(strRunConfiguration));

			// if the deb.runConfiguration is true, return false here.

			if (!bypass) {

				bypassAlreadyChecked = true;

				return false;

			}

			// the system is bypassing the configuration utility. We need to

			// get the backup properties and replace existing properties with

			// backup values.  We do this for main and org properties.

			for (String skinName : skinNames) {

				SortedProperties backupProperties = getBackupProperties(skinName);

				Vector<String> backupPropertyNames = 

					backupProperties.getPropertyNames();

				for (String backupPropertyName : backupPropertyNames) {

					String value = backupProperties.getProperty(backupPropertyName);

					backupProperties.setPropertyNoPersist(backupPropertyName, value);

				}

				backupProperties.store();

			}

		} catch (PropertyNotFoundException pnfe) {

			logMetacat.error("Could not find property: " + pnfe.getMessage());

		} catch (GeneralPropertyException gpe) {

			logMetacat.error("General property error: " + gpe.getMessage());

		}

		bypassAlreadyChecked = true;

		return bypass;

	}

}