Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/ExternalIndexConverter.java @ 1119:7c4f81f74c47
merged gnv-artifacts
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:00 +0200 |
| parents | f953c9a559d8 |
| children |
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| 1027:fca4b5eb8d2f | 1119:7c4f81f74c47 |
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| 1 /* | |
| 2 * Copyright (c) 2010 by Intevation GmbH | |
| 3 * | |
| 4 * This program is free software under the LGPL (>=v2.1) | |
| 5 * Read the file LGPL.txt coming with the software for details | |
| 6 * or visit http://www.gnu.org/licenses/ if it does not exist. | |
| 7 */ | |
| 8 | |
| 9 package de.intevation.gnv.raster; | |
| 10 | |
| 11 import org.apache.log4j.Logger; | |
| 12 | |
| 13 /** | |
| 14 * Converts the interal color index of a polygon to the external index | |
| 15 * defined by the corresponding palette entry. | |
| 16 * | |
| 17 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 18 */ | |
| 19 public class ExternalIndexConverter | |
| 20 implements JTSMultiPolygonProducer.ValueConverter | |
| 21 { | |
| 22 private static Logger log = Logger.getLogger( | |
| 23 ExternalIndexConverter.class); | |
| 24 | |
| 25 /** | |
| 26 * The palette where to find the color indices. | |
| 27 */ | |
| 28 protected Palette palette; | |
| 29 | |
| 30 /** | |
| 31 * Default constructor. | |
| 32 */ | |
| 33 public ExternalIndexConverter() { | |
| 34 } | |
| 35 | |
| 36 /** | |
| 37 * Constrcutor to create an ExternalIndexConverter with | |
| 38 * a given palette. | |
| 39 * @param palette The palette where to find the color indices. | |
| 40 */ | |
| 41 public ExternalIndexConverter(Palette palette) { | |
| 42 this.palette = palette; | |
| 43 } | |
| 44 | |
| 45 /** | |
| 46 * Maps the color index of a polygon to the external index | |
| 47 * defined by the corresponing palette entry. | |
| 48 * @param value The value to convert | |
| 49 * @return The mapped value or the original value if | |
| 50 * no corresponing palette entry was found. | |
| 51 */ | |
| 52 public Integer convert(Integer value) { | |
| 53 if (value == null) { | |
| 54 return value; | |
| 55 } | |
| 56 | |
| 57 int v = value.intValue(); | |
| 58 | |
| 59 if (v == -1) { | |
| 60 return value; | |
| 61 } | |
| 62 | |
| 63 Palette.Entry entry = palette.getEntryByIndex(v); | |
| 64 | |
| 65 if (entry == null) { | |
| 66 log.warn("cannot find palette entry for index: " + v); | |
| 67 return value; | |
| 68 } | |
| 69 | |
| 70 return Integer.valueOf(entry.getExternalIndex()); | |
| 71 } | |
| 72 } | |
| 73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |