Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/ExternalIndexConverter.java @ 875:5e9efdda6894
merged gnv-artifacts/1.0
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:56 +0200 |
| parents | feae2f9d6c6f |
| children | f953c9a559d8 |
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| 722:bb3ffe7d719e | 875:5e9efdda6894 |
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| 1 package de.intevation.gnv.raster; | |
| 2 | |
| 3 import org.apache.log4j.Logger; | |
| 4 | |
| 5 /** | |
| 6 * Converts the interal color index of a polygon to the external index | |
| 7 * defined by the corresponding palette entry. | |
| 8 * | |
| 9 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 10 */ | |
| 11 public class ExternalIndexConverter | |
| 12 implements JTSMultiPolygonProducer.ValueConverter | |
| 13 { | |
| 14 private static Logger log = Logger.getLogger( | |
| 15 ExternalIndexConverter.class); | |
| 16 | |
| 17 /** | |
| 18 * The palette where to find the color indices. | |
| 19 */ | |
| 20 protected Palette palette; | |
| 21 | |
| 22 /** | |
| 23 * Default constructor. | |
| 24 */ | |
| 25 public ExternalIndexConverter() { | |
| 26 } | |
| 27 | |
| 28 /** | |
| 29 * Constrcutor to create an ExternalIndexConverter with | |
| 30 * a given palette. | |
| 31 * @param palette The palette where to find the color indices. | |
| 32 */ | |
| 33 public ExternalIndexConverter(Palette palette) { | |
| 34 this.palette = palette; | |
| 35 } | |
| 36 | |
| 37 /** | |
| 38 * Maps the color index of a polygon to the external index | |
| 39 * defined by the corresponing palette entry. | |
| 40 * @param value The value to convert | |
| 41 * @return The mapped value or the original value if | |
| 42 * no corresponing palette entry was found. | |
| 43 */ | |
| 44 public Integer convert(Integer value) { | |
| 45 if (value == null) { | |
| 46 return value; | |
| 47 } | |
| 48 | |
| 49 int v = value.intValue(); | |
| 50 | |
| 51 if (v == -1) { | |
| 52 return value; | |
| 53 } | |
| 54 | |
| 55 Palette.Entry entry = palette.getEntryByIndex(v); | |
| 56 | |
| 57 if (entry == null) { | |
| 58 log.warn("cannot find palette entry for index: " + v); | |
| 59 return value; | |
| 60 } | |
| 61 | |
| 62 return Integer.valueOf(entry.getExternalIndex()); | |
| 63 } | |
| 64 } | |
| 65 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |