--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/servlet/src/digilib/io/ImageFileset.java	Wed Nov 17 18:17:34 2004 +0100
@@ -0,0 +1,326 @@
+/* ImageFileset -- digilib image file info class.  
+ * Digital Image Library servlet components  
+ * Copyright (C) 2003 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  
+ */
+
+package digilib.io;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Map;
+
+import digilib.image.ImageOps;
+import digilib.image.ImageSize;
+
+/**
+ * @author casties
+ */
+public class ImageFileset extends DigiDirent {
+
+	/** this is an image file */
+	protected static int FILE_CLASS = FileOps.CLASS_IMAGE;
+
+	/** list of files (ImageFile) */
+	private List files;
+
+	/** resolution of the biggest image (DPI) */
+	private float resX = 0;
+
+	/** resolution of the biggest image (DPI) */
+	private float resY = 0;
+
+	/**
+	 * Constructor with a file and hints.
+	 * 
+	 * The hints are expected to contain 'basedirs' and 'scaledfilext' keys.
+	 * 
+	 * @param file
+	 * @param hints
+	 */
+	public ImageFileset(File file, DigiDirectory parent, Map hints) {
+		super(file.getName(), parent);
+		files = new ArrayList(FileOps.getBaseDirs().length);
+		fill(file, hints);
+	}
+
+	/**
+	 * Gets the default File.
+	 * 
+	 */
+	public ImageFile getFile() {
+		return (files != null) ? (ImageFile) files.get(0) : null;
+	}
+
+	/**
+	 * Get the ImageFile at the index.
+	 * 
+	 * 
+	 * @param index
+	 * @return
+	 */
+	public ImageFile get(int index) {
+		return (files != null) ? (ImageFile) files.get(index) : null;
+	}
+
+	/**
+	 * Get the next smaller ImageFile than the given size.
+	 * 
+	 * Returns the ImageFile from the set that has a width and height smaller or
+	 * equal the given size. Returns null if there isn't any smaller image.
+	 * Needs DocuInfo instance to checkFile().
+	 * 
+	 * 
+	 * @param size
+	 * @param info
+	 * @return
+	 */
+	public ImageFile getNextSmaller(ImageSize size) {
+		for (Iterator i = getHiresIterator(); i.hasNext();) {
+			ImageFile f = (ImageFile) i.next();
+			try {
+				ImageOps.checkFile(f);
+				if (f.getSize().isTotallySmallerThan(size)) {
+					return f;
+				}
+			} catch (IOException e) {
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Get the next bigger ImageFile than the given size.
+	 * 
+	 * Returns the ImageFile from the set that has a width or height bigger or
+	 * equal the given size. Returns null if there isn't any bigger image. Needs
+	 * DocuInfo instance to checkFile().
+	 * 
+	 * 
+	 * @param size
+	 * @param info
+	 * @return
+	 */
+	public ImageFile getNextBigger(ImageSize size) {
+		for (ListIterator i = getLoresIterator(); i.hasPrevious();) {
+			ImageFile f = (ImageFile) i.previous();
+			try {
+				ImageOps.checkFile(f);
+				if (f.getSize().isBiggerThan(size)) {
+					return f;
+				}
+			} catch (IOException e) {
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Returns the biggest ImageFile in the set.
+	 * 
+	 * 
+	 * @return
+	 */
+	public ImageFile getBiggest() {
+		return (ImageFile) files.get(0);
+	}
+
+	/**
+	 * Returns the biggest ImageFile in the set.
+	 * 
+	 * 
+	 * @return
+	 */
+	public ImageFile getSmallest() {
+		return (ImageFile) files.get(files.size() - 1);
+	}
+
+	/**
+	 * Get an Iterator for this Fileset starting at the highest resolution
+	 * images.
+	 * 
+	 * 
+	 * @return
+	 */
+	public ListIterator getHiresIterator() {
+		return files.listIterator();
+	}
+
+	/**
+	 * Get an Iterator for this Fileset starting at the lowest resolution
+	 * images.
+	 * 
+	 * The Iterator starts at the last element, so you have to use it backwards
+	 * with hasPrevious() and previous().
+	 * 
+	 * 
+	 * @return
+	 */
+	public ListIterator getLoresIterator() {
+		return files.listIterator(files.size());
+	}
+
+	/**
+	 * Fill the ImageFileset with files from different base directories.
+	 * 
+	 * 
+	 * @param dirs
+	 *            list of base directories
+	 * @param imf
+	 *            file (from first base dir)
+	 * @param hints
+	 * 
+	 */
+	void fill(File imf, Map hints) {
+		File[][] scaledirs = (File[][]) hints.get(FileOps.HINT_BASEDIRS);
+		File[] bd = FileOps.getBaseDirs();
+		int nb = bd.length;
+		if (scaledirs == null) {
+			// read all scaled directories
+			scaledirs = new File[nb][];
+			for (int i = 1; i < nb; i++) {
+				// check basedir + digilib path
+				File d = FileOps.getRealFile(bd[i], parent.getDLPath());
+				scaledirs[i] = d.listFiles();
+			}
+			hints.put(FileOps.HINT_BASEDIRS, scaledirs);
+		}
+		// add the first ImageFile to the ImageFileset
+		files.add(new ImageFile(imf));
+		// iterate the remaining base directories
+		for (int dirIdx = 1; dirIdx < nb; dirIdx++) {
+			if (scaledirs[dirIdx] == null) {
+				continue;
+			}
+			// find the file in the directory
+			File fn = FileOps.findFile(imf, scaledirs[dirIdx]);
+			if (fn == null) {
+				continue;
+			}
+			if (FileOps.classForFile(fn) == FileOps.CLASS_IMAGE) {
+				// add to the fileset
+				files.add(new ImageFile(fn));
+			}
+		}
+	}
+
+	/**
+	 * Reads metadata and sets resolution in resX and resY.
+	 * 
+	 */
+	public void readMeta() {
+		if (isMetaRead) {
+			return;
+		}
+		// read the metadata file
+		super.readMeta();
+		if (meta == null) {
+			// try directory metadata
+			meta = parent.getMeta();
+			if (meta == null) {
+				// no metadata available
+				isMetaRead = true;
+				return;
+			}
+		}
+		isMetaRead = true;
+		String s;
+		float dpi = 0;
+		float dpix = 0;
+		float dpiy = 0;
+		float sizex = 0;
+		float sizey = 0;
+		float pixx = 0;
+		float pixy = 0;
+		// DPI is valid for X and Y
+		if (meta.containsKey("original-dpi")) {
+			try {
+				dpi = Float.parseFloat((String) meta.get("original-dpi"));
+			} catch (NumberFormatException e) {
+			}
+			if (dpi != 0) {
+				resX = dpi;
+				resY = dpi;
+				return;
+			}
+		}
+		// DPI-X and DPI-Y
+		if (meta.containsKey("original-dpi-x")
+				&& meta.containsKey("original-dpi-y")) {
+			try {
+				dpix = Float.parseFloat((String) meta.get("original-dpi-x"));
+				dpiy = Float.parseFloat((String) meta.get("original-dpi-y"));
+			} catch (NumberFormatException e) {
+			}
+			if ((dpix != 0) && (dpiy != 0)) {
+				resX = dpix;
+				resY = dpiy;
+				return;
+			}
+		}
+		// SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y
+		if (meta.containsKey("original-size-x")
+				&& meta.containsKey("original-size-y")
+				&& meta.containsKey("original-pixel-x")
+				&& meta.containsKey("original-pixel-y")) {
+			try {
+				sizex = Float.parseFloat((String) meta.get("original-size-x"));
+				sizey = Float.parseFloat((String) meta.get("original-size-y"));
+				pixx = Float.parseFloat((String) meta.get("original-pixel-x"));
+				pixy = Float.parseFloat((String) meta.get("original-pixel-y"));
+			} catch (NumberFormatException e) {
+			}
+			if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) {
+				resX = pixx / (sizex * 100 / 2.54f);
+				resY = pixy / (sizey * 100 / 2.54f);
+				return;
+			}
+		}
+	}
+
+	/**
+	 * Returns the aspect ratio of the images.
+	 * 
+	 * @return
+	 */
+	public float getAspect() {
+		for (Iterator i = files.iterator(); i.hasNext();) {
+			ImageFile f = (ImageFile) i.next();
+			ImageSize s = f.getSize();
+			if (s != null) {
+				return s.getAspect();
+			}
+		}
+		return 0f;
+	}
+
+	/**
+	 * @return
+	 */
+	public float getResX() {
+		return resX;
+	}
+
+	/**
+	 * @return
+	 */
+	public float getResY() {
+		return resY;
+	}
+
+}
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