ThumbnailCacheProvider.java

package org.jwildfire.create.tina.swing;

import java.io.File;

import javax.swing.JLabel;

import org.jwildfire.base.Prefs;
import org.jwildfire.base.Tools;
import org.jwildfire.image.SimpleImage;
import org.jwildfire.io.ImageReader;
import org.jwildfire.io.ImageWriter;

public class ThumbnailCacheProvider {

  private static final String JAVA_IO_TMPDIR = "java.io.tmpdir";
  private static final String JWILDFIRE_DRAWER = "j-wildfire";

  public static SimpleImage getThumbnail(ThumbnailCacheKey pCacheKey, int pWidth) {
    File file = new File(rootDrawer, pCacheKey.getCacheKey(pWidth) + "." + Tools.FILEEXT_PNG);
    return tryReadImage(pWidth, file);
  }

  public static SimpleImage getThumbnail(ThumbnailCacheKey pCacheKey, int pWidth, int pHeight) {
    File file = new File(rootDrawer, pCacheKey.getCacheKey(pWidth, pHeight) + "." + Tools.FILEEXT_PNG);
    return tryReadImage(pWidth, pHeight, file);
  }

  public static SimpleImage getThumbnail(ThumbnailCacheKey pCacheKey, int pWidth, int pHeight, int pQuality) {
    File file = new File(rootDrawer, pCacheKey.getCacheKey(pWidth, pHeight, pQuality) + "." + Tools.FILEEXT_PNG);
    return tryReadImage(pWidth, pHeight, file);
  }

  private static SimpleImage tryReadImage(int pWidth, int pHeight, File pFile) {
    if (pFile.exists()) {
      try {
        SimpleImage img = new ImageReader(new JLabel()).loadImage(pFile.getAbsolutePath());
        if (img != null && img.getImageWidth() == pWidth && img.getImageHeight() == pHeight) {
          return img;
        }
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }
    }
    return null;
  }

  private static SimpleImage tryReadImage(int pWidth, File pFile) {
    if (pFile.exists()) {
      try {
        SimpleImage img = new ImageReader(new JLabel()).loadImage(pFile.getAbsolutePath());
        if (img != null && img.getImageWidth() == pWidth) {
          return img;
        }
      }
      catch (Exception ex) {
        ex.printStackTrace();
      }
    }
    return null;
  }

  public static void storeThumbnail(ThumbnailCacheKey pCacheKey, int pWidth, SimpleImage pThumbnail) {
    File file = new File(rootDrawer, pCacheKey.getCacheKey(pWidth) + "." + Tools.FILEEXT_PNG);
    tryWriteImage(pThumbnail, file);
  }

  public static void storeThumbnail(ThumbnailCacheKey pCacheKey, int pWidth, int pHeight, SimpleImage pThumbnail) {
    File file = new File(rootDrawer, pCacheKey.getCacheKey(pWidth, pHeight) + "." + Tools.FILEEXT_PNG);
    tryWriteImage(pThumbnail, file);
  }

  public static void storeThumbnail(ThumbnailCacheKey pCacheKey, int pWidth, int pHeight, int pQuality, SimpleImage pThumbnail) {
    File file = new File(rootDrawer, pCacheKey.getCacheKey(pWidth, pHeight, pQuality) + "." + Tools.FILEEXT_PNG);
    tryWriteImage(pThumbnail, file);
  }

  private static File rootDrawer;

  static {
    String path = Prefs.getPrefs().getThumbnailPath();
    if (path == null || path.length() == 0) {
      rootDrawer = new File(System.getProperty(JAVA_IO_TMPDIR), JWILDFIRE_DRAWER);
    }
    else {
      rootDrawer = new File(path);
    }
    if (!rootDrawer.exists()) {
      if (!rootDrawer.mkdirs()) {
        rootDrawer = new File(System.getProperty(JAVA_IO_TMPDIR));
        if (!rootDrawer.exists()) {
          rootDrawer.mkdirs();
        }
      }
    }
  }

  private static void tryWriteImage(SimpleImage pThumbnail, File pFile) {
    try {
      new ImageWriter().saveAsPNG(pThumbnail, pFile.getAbsolutePath());
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

}