bundles/org.simantics.g2d/src/org/simantics/g2d/image/impl/ImageBundleFactory.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.g2d.image.impl;
  13
  14 import java.net.URL;
  15
  16 import org.eclipse.core.runtime.FileLocator;
  17 import org.eclipse.core.runtime.IPath;
  18 import org.eclipse.core.runtime.Path;
  19 import org.eclipse.core.runtime.Platform;
  20 import org.osgi.framework.Bundle;
  21 import org.simantics.g2d.image.Image;
  22 import org.simantics.g2d.image.ImageUtils;
  23 import org.simantics.utils.datastructures.cache.IFactory;
  24
  25 /**
  26  * Lazy initialization of bundle resources.
  27  * This class is capable of opening .svg .png .jpg etc files.
  28  *
  29  * @See {@link ImageUtils}
  30  * @author Toni Kalajainen
  31  */
  32 public class ImageBundleFactory extends ImageURLFactory implements IFactory<Image> {
  33
  34         private static URL _resolveFilename(String filename)
  35         throws RuntimeException
  36         {
  37                 IPath p = new Path(filename);
  38                 String bundleId = p.segment(0);
  39                 IPath bundlePath = p.removeFirstSegments(1);
  40                 Bundle bundle = Platform.getBundle(bundleId);
  41                 URL url = FileLocator.find(bundle, bundlePath, null);
  42                 if (url==null)
  43                 throw new RuntimeException("File '" + bundlePath + "' not found in bundle '" + bundleId + "'");
  44                 return url;
  45         }
  46
  47         public ImageBundleFactory(String filename)
  48         throws RuntimeException
  49         {
  50                 super(_resolveFilename(filename));
  51         }
  52
  53 }