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1 /* DocuImage -- General image interface class implementation
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2001, 2002 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 */
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20
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21 package digilib.image;
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22
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23 import java.io.*;
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24 import javax.servlet.ServletResponse;
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25
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26 import digilib.*;
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27 import digilib.io.*;
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28
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29 /** Simple abstract implementation of the <code>DocuImage</code> interface.
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30 *
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31 * This implementation provides basic functionality for the utility methods like
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32 * <code>SetUtils</code>, and <code>getKnownFileTypes</code>. Image methods like
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33 * <code>loadImage</code>, <code>writeImage</code>, <code>getWidth</code>,
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34 * <code>getHeight</code> and <code>cropAndScale</code> must be implemented by
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35 * derived classes.
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36 */
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37 public abstract class DocuImageImpl implements DocuImage {
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38
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39 /** Internal utils object. */
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40 protected Utils util = null;
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41
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42 /** Default constructor. */
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43 public DocuImageImpl() {
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44 util = new Utils();
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45 }
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46
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47 /** Contructor taking an utils object.
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48 *
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49 * @param u Utils object.
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50 */
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51 public DocuImageImpl(Utils u) {
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52 util = u;
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53 }
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54
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55 /** Set local Utils object.
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56 *
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57 * @param u Utils object.
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58 */
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59 public void setUtils(Utils u) {
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60 util = u;
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61 }
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62
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63 /** Internal knownFileTypes. */
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64 protected String[] knownFileTypes = {"jpg", "png", "gif", "tiff"};
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65
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66 /** Returns the list of image file types known to the DocuImage implementation.
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67 *
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68 * @return List of image file types. Strings are standard file extensions.
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69 */
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70 public String[] getKnownFileTypes() {
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71 return knownFileTypes;
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72 }
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73
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74
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75 public abstract void loadImage(File f) throws FileOpException;
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76 public abstract void writeImage(String mt, ServletResponse res) throws FileOpException;
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77 public abstract int getWidth();
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78 public abstract int getHeight();
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79 public abstract void cropAndScale(int x_off, int y_off, int width, int height, float scale, int qual) throws ImageOpException;
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80 }
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