org.freedesktop.wallpapers.DefaultWallpaperService.java Source code

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Here is the source code for org.freedesktop.wallpapers.DefaultWallpaperService.java

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/**
 * SSHTOOLS Limited licenses this file to you 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.
 */
package org.freedesktop.wallpapers;

import java.io.IOException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSelectInfo;
import org.apache.commons.vfs2.FileSelector;
import org.freedesktop.themes.AbstractThemeService;
import org.freedesktop.util.Log;

/**
 * Default implementations of an {@link WallpaperService}.
 */
public class DefaultWallpaperService extends AbstractThemeService<Wallpaper> implements WallpaperService {

    protected Collection<Wallpaper> scanBase(FileObject base) throws IOException {
        List<Wallpaper> themes = new ArrayList<Wallpaper>();
        for (FileObject dir : listImages(base)) {
            try {
                themes.add(new Wallpaper(dir));
            } catch (IOException ioe) {
                Log.warn("Invalid wallpaper directory " + dir.getName().getPath() + ". " + ioe.getMessage());
            } catch (ParseException ioe) {
                Log.warn("Invalid wallpaper definition in " + dir.getName().getPath() + ". " + ioe.getMessage());
            }
        }
        return themes;
    }

    protected FileObject[] listImages(FileObject dir) throws IOException {
        FileSelector fileFilter = new ImageSelector();
        FileObject[] files = dir.findFiles(fileFilter);
        if (files == null) {
            throw new IOException("Directory could not be read.");
        }
        return files;
    }

    protected final class ImageSelector implements FileSelector {

        public boolean includeFile(FileSelectInfo info) throws Exception {
            String name = info.getFile().getName().getBaseName().toLowerCase();
            return name.endsWith(".jpg") || name.endsWith(".png") || name.endsWith(".gif");
        }

        public boolean traverseDescendents(FileSelectInfo info) throws Exception {
            return info.getDepth() == 0;
        }
    }
}