D-Net

package eu.dnetlib.xml.database.exist;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.StringReader;

import java.io.StringWriter;

import org.apache.commons.io.IOUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.annotation.Required;

import eu.dnetlib.enabling.tools.BulkResourceImporter;

/**

 * Persistent exist.

 * 

 * TODO: this is copy&paste from TemporaryExistDatase. Refactor common stuff.

 * 

 * @author marko

 * 

 */

public class PersistentExistDatabase extends ExistDatabase {

	/**

	 * logger.

	 */

	private static final Log log = LogFactory.getLog(PersistentExistDatabase.class); // NOPMD by marko on 11/24/08 5:02 PM

	/**

	 * db directory.

	 */

	private transient File dbDirectory;

	/**

	 * this config file will be copied to a newly created temporary directory.

	 */

	private String configTemplate = "default-exist-conf.xml";

	/**

	 * db root path.

	 */

	private String dbRootPath;

	/**

	 * bulk importer.

	 */

	private BulkResourceImporter bulkImporter;

	/**

	 * exist config file.

	 */

	private File existConfigFile;

	/**

	 * true if the database permits execution of java code from xquery.

	 */

	private boolean XQueryJavaEnabled;

	/**

	 * {@inheritDoc}

	 * 

	 * @see eu.dnetlib.xml.database.exist.ExistDatabase#start()

	 */

	@Override

	public void start() {

		log.warn("STARTING PERSISTENT EXIST DATABASE");

		dbDirectory = new File(dbRootPath);

		if (dbDirectory.exists()) {

			bulkImporter.setEnabled(false);

			existConfigFile = new File(dbDirectory, "conf.xml");

			enableJava(existConfigFile, isXQueryJavaEnabled());

			setConfigFile(existConfigFile.getAbsolutePath());

		} else {

			createPersistentDatabase();

		}

		super.start();

	}

	@Override

	public void stop() {

		log.info("shutting down xmldb");

		super.stop();

		log.info("xmldb closed");

	}

	protected void enableJava(final File conf, final boolean enabled) {

		final StringWriter buffer = new StringWriter();

		if (conf.exists()) {

			try {

				IOUtils.copy(new FileReader(conf), buffer);

				final String newConf = patchConfigFileEnableJava(buffer.toString(), enabled);

				if (!newConf.equals(buffer.toString())) {

					FileWriter writer = new FileWriter(conf);

					try {

						IOUtils.copy(new StringReader(newConf), writer);

					} finally {

						writer.close();

					}

				}

			} catch (final FileNotFoundException e) {

				log.warn("cannot patch eXist conf file", e);

			} catch (final IOException e) {

				log.warn("cannot patch eXist conf file", e);

			}

		}

	}

	/**

	 * @param conf

	 *            content of the configuration file

	 * @param enabled

	 *            enabled or disabled

	 * @return new conf file

	 */

	protected String patchConfigFileEnableJava(final String conf, final boolean enabled) {

		return conf.replaceAll("enable-java-binding=\"[^\"]*\"", "enable-java-binding=\"" + (enabled ? "yes" : "no") + "\"");

	}

	/**

	 * create a temporary directory and copy the default configuration file.

	 */

	protected void createPersistentDatabase() {

		log.debug("creating persistent database");

		try {

			new File(dbDirectory, "data").mkdirs();

			final InputStream defaultConf = getClass().getResourceAsStream(getConfigTemplate());

			if (defaultConf == null)

				throw new IOException("cannot find " + getConfigTemplate());

			existConfigFile = new File(dbDirectory, "conf.xml");

			final FileOutputStream confOutput = new FileOutputStream(existConfigFile);

			try {

				IOUtils.copy(defaultConf, confOutput);

			} finally {

				confOutput.close();

			}

			enableJava(existConfigFile, isXQueryJavaEnabled());

			setConfigFile(existConfigFile.getAbsolutePath());

		} catch (final IOException e) {

			log.fatal("creating database dir", e);

			throw new IllegalStateException(e);

		}

		log.debug("created temp database");

	}

	public File getDbDirectory() {

		return dbDirectory;

	}

	public void setDbDirectory(final File dbDirectory) {

		this.dbDirectory = dbDirectory;

	}

	public String getConfigTemplate() {

		return configTemplate;

	}

	public void setConfigTemplate(final String configTemplate) {

		this.configTemplate = configTemplate;

	}

	public BulkResourceImporter getBulkImporter() {

		return bulkImporter;

	}

	@Required

	public void setBulkImporter(final BulkResourceImporter bulkImporter) {

		this.bulkImporter = bulkImporter;

	}

	public File getExistConfigFile() {

		return existConfigFile;

	}

	public void setExistConfigFile(final File existConfigFile) {

		this.existConfigFile = existConfigFile;

	}

	@Required

	public String getDbRootPath() {

		return dbRootPath;

	}

	public void setDbRootPath(final String dbRootPath) {

		this.dbRootPath = dbRootPath;

	}

	public boolean isXQueryJavaEnabled() {

		return XQueryJavaEnabled;

	}

	public void setXQueryJavaEnabled(final boolean xQueryJavaEnabled) {

		XQueryJavaEnabled = xQueryJavaEnabled;

	}

}