Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/ExternalIndexConverter.java @ 949:11d8cc2deb92 1.0

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merged doc/1.0
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:13:58 +0200
parents feae2f9d6c6f
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 import org.apache.log4j.Logger;
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4
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5 /**
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6 * Converts the interal color index of a polygon to the external index
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7 * defined by the corresponding palette entry.
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8 *
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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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9 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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10 */
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11 public class ExternalIndexConverter
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12 implements JTSMultiPolygonProducer.ValueConverter
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13 {
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14 private static Logger log = Logger.getLogger(
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15 ExternalIndexConverter.class);
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17 /**
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18 * The palette where to find the color indices.
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19 */
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20 protected Palette palette;
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21
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22 /**
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23 * Default constructor.
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24 */
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25 public ExternalIndexConverter() {
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26 }
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27
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28 /**
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29 * Constrcutor to create an ExternalIndexConverter with
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30 * a given palette.
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31 * @param palette The palette where to find the color indices.
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32 */
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33 public ExternalIndexConverter(Palette palette) {
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34 this.palette = palette;
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35 }
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36
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37 /**
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38 * Maps the color index of a polygon to the external index
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39 * defined by the corresponing palette entry.
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40 * @param value The value to convert
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41 * @return The mapped value or the original value if
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42 * no corresponing palette entry was found.
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43 */
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44 public Integer convert(Integer value) {
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45 if (value == null) {
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46 return value;
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47 }
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49 int v = value.intValue();
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50
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51 if (v == -1) {
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52 return value;
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53 }
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54
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55 Palette.Entry entry = palette.getEntryByIndex(v);
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56
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57 if (entry == null) {
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58 log.warn("cannot find palette entry for index: " + v);
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59 return value;
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60 }
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61
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62 return Integer.valueOf(entry.getExternalIndex());
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63 }
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64 }
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65 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org