Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/ExternalIndexConverter.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 803
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
f953c9a559d8 Added license file and license headers.
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3 *
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
f953c9a559d8 Added license file and license headers.
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.raster;
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10
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11 import org.apache.log4j.Logger;
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12
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13 /**
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14 * Converts the interal color index of a polygon to the external index
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15 * defined by the corresponding palette entry.
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16 *
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c4156275c1e1 Bring @author javadoc tags in form '@author <a href="john.doe@example.com">John Doe</a>'
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17 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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18 */
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19 public class ExternalIndexConverter
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20 implements JTSMultiPolygonProducer.ValueConverter
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21 {
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22 private static Logger log = Logger.getLogger(
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23 ExternalIndexConverter.class);
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24
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25 /**
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26 * The palette where to find the color indices.
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27 */
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28 protected Palette palette;
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29
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30 /**
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31 * Default constructor.
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32 */
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33 public ExternalIndexConverter() {
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34 }
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35
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36 /**
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37 * Constrcutor to create an ExternalIndexConverter with
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38 * a given palette.
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39 * @param palette The palette where to find the color indices.
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40 */
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41 public ExternalIndexConverter(Palette palette) {
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42 this.palette = palette;
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43 }
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44
802
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45 /**
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46 * Maps the color index of a polygon to the external index
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47 * defined by the corresponing palette entry.
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48 * @param value The value to convert
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49 * @return The mapped value or the original value if
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50 * no corresponing palette entry was found.
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51 */
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52 public Integer convert(Integer value) {
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53 if (value == null) {
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54 return value;
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55 }
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56
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57 int v = value.intValue();
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58
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59 if (v == -1) {
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60 return value;
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61 }
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62
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63 Palette.Entry entry = palette.getEntryByIndex(v);
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64
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65 if (entry == null) {
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66 log.warn("cannot find palette entry for index: " + v);
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67 return value;
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68 }
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69
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70 return Integer.valueOf(entry.getExternalIndex());
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org