it.tidalwave.geo.viewer.impl.spi.DefaultResourceCache Maven / Gradle / Ivy

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/***********************************************************************************************************************
 *
 * forceTen - open source geography
 * Copyright (C) 2007-2012 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://forceten.tidalwave.it
 * SCM: https://bitbucket.org/tidalwave/forceten-src
 *
 **********************************************************************************************************************/
package it.tidalwave.geo.viewer.impl.spi;

import javax.annotation.Nonnull;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.net.URI;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.openide.util.Parameters;
import it.tidalwave.util.logging.Logger;
import it.tidalwave.geo.viewer.role.CacheLocationProvider;
import it.tidalwave.geo.viewer.spi.ResourceCache;
import it.tidalwave.util.NotFoundException;

/***********************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 **********************************************************************************************************************/
public class DefaultResourceCache implements ResourceCache // extends TileCache
  {
    private static final String CLASS = DefaultResourceCache.class.getName();
    private static final Logger logger = Logger.getLogger(CLASS);

    private File cacheFolder;

    @Inject
    private CacheLocationProvider cacheSettings;

    /*******************************************************************************************************************
     *
     * {@inheritDoc}
     *
     ******************************************************************************************************************/
    @Override
    public BufferedImage findImage (final URI uri)
      throws IOException, NotFoundException
      {
        logger.fine("get(%s)", uri);
        File file = getFile(uri);

        if (file.exists() && file.canRead())
          {
            try
              {
                logger.finest(">>>> locally cached at %s", file);
                return ImageIO.read(file);
              }
            catch (IOException e)
              {
                logger.throwing(CLASS, "put()", e);
              }
          }
        
        throw new NotFoundException(uri.toString());
      }

    /*******************************************************************************************************************
     *
     * {@inheritDoc}
     *
     ******************************************************************************************************************/
    @Override
    public synchronized void storeImage (final @Nonnull URI uri, final @Nonnull byte[] buffer)
      {
        Parameters.notNull("uri", uri);
        Parameters.notNull("buffer", buffer);

        logger.fine("storeImage(%s, %d)", uri, buffer.length);
        FileOutputStream fos = null;

        try
          {
            final File file = getFile(uri);
            logger.finest(">>>> locally caching at %s", file);
            fos = new FileOutputStream(file);
            fos.write(buffer);
          }
        catch (IOException e)
          {
            logger.throwing(CLASS, "storeImage()", e);
          }
        finally
          {
            IOUtils.closeQuietly(fos);
          }
      }

    /*******************************************************************************************************************
     *
     * {@inheritDoc}
     *
     ******************************************************************************************************************/
    @Override @Nonnull
    public URI findCachedResourceUri (final @Nonnull URI uri)
      throws NotFoundException
      {
        logger.fine("findCachedResourceUri(%s)", uri);

        try
          {
            final File file = getFile(uri);
            logger.finer(">>>> cached file %s does %sexist", file, file.exists() ? "" : "not ");

            if (!file.exists())
              {
                throw new NotFoundException(uri.toString());
              }

            final URI url = file.toURI();
            logger.finer(">>>> returning %s", url);
            return url;
          }
        catch (IOException e)
          {
            throw new NotFoundException(uri.toString() + " - " + e);
          }
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    private File getFile (final URI uri)
      throws IOException
      {
        String prefix = "";

        // FIXME - use regex matchers and make them registrable
        if (uri.toString().startsWith("http://tile.openstreetmap.org"))
          {
            prefix = "OSM/";
          }
        else if (uri.toString().contains("ortho.tiles.virtualearth.net/tiles/a"))
          {
            prefix = "MVE/a/";
          }
        else if (uri.toString().contains("ortho.tiles.virtualearth.net/tiles/h"))
          {
            prefix = "MVE/h/";
          }
        else if (uri.toString().contains("ortho.tiles.virtualearth.net/tiles/r"))
          {
            prefix = "MVE/r/";
          }
        // END FIXME

        final String fileName = NameMangler.mangle(uri.toString());
        final File file = new File(cacheFolder, prefix + fileName);
        FileUtils.forceMkdir(file.getParentFile());
        return file;
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    @PostConstruct
    @SuppressWarnings("PMD.UnusedPrivateMethod") @edu.umd.cs.findbugs.annotations.SuppressWarnings("UPM_UNCALLED_PRIVATE_METHOD")
    private void initialize()
      {
        this.cacheFolder = cacheSettings.getCacheFolder();
        logger.info(">>>> cacheFolder: " + cacheFolder);
        try
          {
            FileUtils.forceMkdir(cacheFolder);
          }
        catch (IOException e)
          {
            logger.severe("Cannot create cache folder: %s", cacheFolder);
          }
      }
  }