--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlet/src/digilib/image/ImageOps.java	Fri Oct 15 16:59:47 2004 +0200
@@ -0,0 +1,112 @@
+/* ImageOps -- convenience methods for images
+
+ Digital Image Library servlet components
+
+ Copyright (C) 2004 Robert Casties (robcast@mail.berlios.de)
+
+ This program is free software; you can redistribute  it and/or modify it
+ under  the terms of  the GNU General  Public License as published by the
+ Free Software Foundation;  either version 2 of the  License, or (at your
+ option) any later version.
+ 
+ Please read license.txt for the full details. A copy of the GPL
+ may be found at http://www.gnu.org/copyleft/lgpl.html
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+ * Created on 13.10.2004
+ */
+package digilib.image;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.util.Iterator;
+
+import javax.imageio.ImageIO;
+import javax.imageio.ImageReader;
+import javax.imageio.stream.ImageInputStream;
+
+import org.apache.log4j.Logger;
+import org.marcoschmidt.image.ImageInfo;
+
+import digilib.io.FileOpException;
+import digilib.io.FileOps;
+import digilib.io.ImageFile;
+import digilib.io.ImageFileset;
+
+/**
+ * convenience methods for images
+ * 
+ * @author casties
+ */
+public class ImageOps {
+
+	private static Logger logger = Logger.getLogger(ImageOps.class);
+
+	/** Check image size and type and store in ImageFile f */
+	public static boolean checkFile(ImageFile imgf) throws IOException {
+		// fileset to store the information
+		ImageFileset imgfs = imgf.getParent();
+		File f = imgf.getFile();
+		if (f == null) {
+			throw new IOException("File not found!");
+		}
+		RandomAccessFile raf = new RandomAccessFile(f, "r");
+		// set up ImageInfo object
+		ImageInfo iif = new ImageInfo();
+		iif.setInput(raf);
+		iif.setCollectComments(false);
+		iif.setDetermineImageNumber(false);
+		logger.debug("identifying (ImageInfo) " + f);
+		// try with ImageInfo first
+		if (iif.check()) {
+			ImageSize d = new ImageSize(iif.getWidth(), iif.getHeight());
+			imgf.setSize(d);
+			imgf.setMimetype(iif.getMimeType());
+			//logger.debug("  format:"+iif.getFormatName());
+			if (imgfs != null) {
+				imgfs.setAspect(d);
+			}
+			raf.close();
+			iif = null;
+		} else {
+			iif = null;
+			logger.debug("identifying (ImageIO) " + f);
+			/*
+			 * else use ImageReader
+			 */
+			ImageInputStream istream = ImageIO.createImageInputStream(raf);
+			Iterator readers = ImageIO.getImageReaders(istream);
+			if ((readers == null) || (!readers.hasNext())) {
+				throw new FileOpException("ERROR: unknown image file format!");
+			}
+			ImageReader reader = (ImageReader) readers.next();
+			/* are there more readers? */
+			logger.debug("ImageIO: this reader: " + reader.getClass());
+			while (readers.hasNext()) {
+				logger.debug("ImageIO: next reader: "
+						+ readers.next().getClass());
+			}
+			reader.setInput(istream);
+			ImageSize d = new ImageSize(reader.getWidth(0), reader.getHeight(0));
+			imgf.setSize(d);
+			//String t = reader.getFormatName();
+			String t = FileOps.mimeForFile(f);
+			imgf.setMimetype(t);
+			//logger.debug("  format:"+t);
+			if (imgfs != null) {
+				imgfs.setAspect(d);
+			}
+			// dispose the reader to free resources
+			reader.dispose();
+			raf.close();
+			reader = null;
+		}
+		logger.debug("image size: " + imgf.getSize());
+		return true;
+	}
+
+}