Source Code Cross Referenced for ImagePyramidFormat.java in  » GIS » GeoTools-2.4.1 » org » geotools » gce » imagepyramid » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.gce.imagepyramid 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Geotools 2 - OpenSource mapping toolkit
003:         * (C) 2006, Geotools Project Managment Committee (PMC)
004:         *
005:         *    This library is free software; you can redistribute it and/or
006:         *    modify it under the terms of the GNU Lesser General Public
007:         *    License as published by the Free Software Foundation; either
008:         *    version 2.1 of the License, or (at your option) any later version.
009:         *
010:         *    This library is distributed in the hope that it will be useful,
011:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         *    Lesser General Public License for more details.
014:         *
015:         *    You should have received a copy of the GNU Lesser General Public
016:         *    License along with this library; if not, write to the Free Software
017:         *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018:         */
019:        package org.geotools.gce.imagepyramid;
020:
021:        import java.awt.Color;
022:        import java.io.BufferedInputStream;
023:        import java.io.File;
024:        import java.io.FileInputStream;
025:        import java.io.IOException;
026:        import java.io.RandomAccessFile;
027:        import java.net.MalformedURLException;
028:        import java.net.URL;
029:        import java.net.URLDecoder;
030:        import java.util.HashMap;
031:        import java.util.Properties;
032:        import java.util.logging.Level;
033:        import java.util.logging.Logger;
034:
035:        import org.geotools.coverage.grid.io.AbstractGridFormat;
036:        import org.geotools.coverage.grid.io.imageio.GeoToolsWriteParams;
037:        import org.geotools.data.DataSourceException;
038:        import org.geotools.data.PrjFileReader;
039:        import org.geotools.factory.Hints;
040:        import org.geotools.parameter.DefaultParameterDescriptor;
041:        import org.geotools.parameter.DefaultParameterDescriptorGroup;
042:        import org.geotools.parameter.ParameterGroup;
043:        import org.opengis.coverage.grid.Format;
044:        import org.opengis.coverage.grid.GridCoverageReader;
045:        import org.opengis.coverage.grid.GridCoverageWriter;
046:        import org.opengis.parameter.GeneralParameterDescriptor;
047:        import org.opengis.referencing.FactoryException;
048:        import org.opengis.referencing.crs.CoordinateReferenceSystem;
049:
050:        /**
051:         * This class implements the basic format capabilities for a coverage format.
052:         * 
053:         * @author Simone Giannecchini (simboss)
054:         */
055:        public final class ImagePyramidFormat extends AbstractGridFormat
056:                implements  Format {
057:
058:            /** Logger. */
059:            private final static Logger LOGGER = org.geotools.util.logging.Logging
060:                    .getLogger("org.geotools.gce.imagepyramid");
061:
062:            /** Control the transparency of the output coverage. */
063:            public static final DefaultParameterDescriptor OUTPUT_TRANSPARENT_COLOR = new DefaultParameterDescriptor(
064:                    "OutputTransparentColor", Color.class, null, null);
065:
066:            /** Control the type of the final mosaic. */
067:            public static final DefaultParameterDescriptor FADING = new DefaultParameterDescriptor(
068:                    "Fading", Boolean.class, null, Boolean.FALSE);
069:
070:            /** Control the transparency of the output coverage. */
071:            public static final DefaultParameterDescriptor INPUT_TRANSPARENT_COLOR = new DefaultParameterDescriptor(
072:                    "InputTransparentColor", Color.class, null, null);
073:
074:            /** Control the thresholding on the input coverage */
075:            public static final DefaultParameterDescriptor INPUT_IMAGE_THRESHOLD_VALUE = new DefaultParameterDescriptor(
076:                    "InputImageThresholdValue", Double.class, null, new Double(
077:                            Double.NaN));
078:
079:            /**
080:             * Creates an instance and sets the metadata.
081:             */
082:            public ImagePyramidFormat() {
083:                setInfo();
084:            }
085:
086:            /**
087:             * Sets the metadata information for this format
088:             */
089:            private void setInfo() {
090:                HashMap info = new HashMap();
091:
092:                info.put("name", "ImagePyramid");
093:                info.put("description", "Image pyramidal plugin");
094:                info.put("vendor", "Geotools");
095:                info.put("docURL", "");
096:                info.put("version", "1.0");
097:                mInfo = info;
098:
099:                // reading parameters
100:                readParameters = new ParameterGroup(
101:                        new DefaultParameterDescriptorGroup(mInfo,
102:                                new GeneralParameterDescriptor[] {
103:                                        READ_GRIDGEOMETRY2D,
104:                                        INPUT_TRANSPARENT_COLOR,
105:                                        INPUT_IMAGE_THRESHOLD_VALUE,
106:                                        OUTPUT_TRANSPARENT_COLOR }));
107:
108:                // reading parameters
109:                writeParameters = null;
110:            }
111:
112:            /**
113:             * Retrieves a reader for this source object in case the provided source can
114:             * be read using this plugin.
115:             * 
116:             * @param source
117:             *            Object
118:             * @return An {@link ImagePyramidReader} if the provided object can be read
119:             *         using this plugin or null.
120:             */
121:            public GridCoverageReader getReader(Object source) {
122:                return getReader(source, null);
123:            }
124:
125:            /**
126:             * This methods throw an {@link UnsupportedOperationException} because this
127:             * plugiin si read only.
128:             */
129:            public GridCoverageWriter getWriter(Object destination) {
130:                throw new UnsupportedOperationException(
131:                        "This plugin is a read only plugin!");
132:            }
133:
134:            /**
135:             * @see org.geotools.data.coverage.grid.AbstractGridFormat#accepts(Object
136:             *      input)
137:             */
138:            public boolean accepts(Object source) {
139:                try {
140:
141:                    File sourceFile;
142:                    // /////////////////////////////////////////////////////////////////////
143:                    //
144:                    // Check source
145:                    //
146:                    // /////////////////////////////////////////////////////////////////////
147:                    if (source instanceof  File)
148:                        sourceFile = (File) source;
149:                    else if (source instanceof  URL) {
150:
151:                        final URL sourceURL = (URL) source;
152:                        if (sourceURL.getProtocol() != "file")
153:                            return false;
154:
155:                        final String temp = URLDecoder.decode(sourceURL
156:                                .getFile(), "UTF8");
157:
158:                        sourceFile = new File(temp);
159:                    } else if (source instanceof  String) {
160:                        sourceFile = new File((String) source);
161:                        if (!sourceFile.exists())
162:                            return false;
163:                    } else
164:                        return false;
165:                    // ///////////////////////////////////////////////////////////////////
166:                    //
167:                    // Trying to load informations
168:                    //
169:                    //
170:                    // ///////////////////////////////////////////////////////////////////
171:                    // //
172:                    //
173:                    // get the crs if able to
174:                    //
175:                    // //
176:                    String fileName = sourceFile.getAbsolutePath();
177:                    final int index = fileName.lastIndexOf('.');
178:                    if (index != -1)
179:                        fileName = fileName.substring(0, index);
180:                    PrjFileReader crsReader;
181:                    try {
182:                        crsReader = new PrjFileReader(new RandomAccessFile(
183:                                new StringBuffer(fileName).append(".prj")
184:                                        .toString(), "r").getChannel());
185:                    } catch (FactoryException e) {
186:                        if (LOGGER.isLoggable(Level.FINE))
187:                            LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
188:                        throw new DataSourceException(e);
189:                    }
190:                    CoordinateReferenceSystem tempcrs = crsReader
191:                            .getCoordinateReferenceSystem();
192:                    if (tempcrs == null) {
193:                        // use the default crs
194:                        tempcrs = AbstractGridFormat.getDefaultCRS();
195:                        LOGGER
196:                                .log(
197:                                        Level.FINE,
198:                                        new StringBuffer(
199:                                                "Unable to find a CRS for this coverage, using a default one: ")
200:                                                .append(tempcrs.toWKT())
201:                                                .toString());
202:                    }
203:                    //
204:                    // ///////////////////////////////////////////////////////////////////
205:                    //
206:                    // Load properties file with information about levels and envelope
207:                    //
208:                    //
209:                    // ///////////////////////////////////////////////////////////////////
210:                    // property file
211:                    final Properties properties = new Properties();
212:                    try {
213:                        properties.load(new BufferedInputStream(
214:                                new FileInputStream(sourceFile)));
215:                    } catch (Exception e) {
216:                        return false;
217:                    }
218:
219:                    // load the envelope
220:                    final String envelope = properties
221:                            .getProperty("Envelope2D");
222:                    if (envelope == null)
223:                        return false;
224:                    String[] pairs = envelope.split(" ");
225:                    final double cornersV[][] = new double[2][2];
226:                    String pair[];
227:                    for (int i = 0; i < 2; i++) {
228:                        pair = pairs[i].split(",");
229:                        cornersV[i][0] = Double.parseDouble(pair[0]);
230:                        cornersV[i][1] = Double.parseDouble(pair[1]);
231:                    }
232:
233:                    // overviews dir
234:                    int numOverviews = Integer.parseInt(properties
235:                            .getProperty("LevelsNum")) - 1;
236:
237:                    // resolutions levels
238:                    final String levels = properties.getProperty("Levels");
239:                    pairs = levels.split(" ");
240:                    double[][] overViewResolutions = numOverviews > 1 ? new double[numOverviews][2]
241:                            : null;
242:                    pair = pairs[0].split(",");
243:                    double[] highestRes = new double[2];
244:                    highestRes[0] = Double.parseDouble(pair[0]);
245:                    highestRes[1] = Double.parseDouble(pair[1]);
246:                    for (int i = 1; i < numOverviews + 1; i++) {
247:                        pair = pairs[i].split(",");
248:                        overViewResolutions[i - 1][0] = Double
249:                                .parseDouble(pair[0]);
250:                        overViewResolutions[i - 1][1] = Double
251:                                .parseDouble(pair[1]);
252:                    }
253:
254:                    // name
255:                    if (properties.getProperty("Name") == null)
256:                        return false;
257:
258:                    return true;
259:                } catch (IOException e) {
260:                    if (LOGGER.isLoggable(Level.FINE))
261:                        LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
262:                    return false;
263:
264:                } catch (NumberFormatException e) {
265:                    if (LOGGER.isLoggable(Level.FINE))
266:                        LOGGER.log(Level.FINE, e.getLocalizedMessage(), e);
267:                    return false;
268:                }
269:
270:            }
271:
272:            /**
273:             * Retrieves a reader for this source object in case the provided source can
274:             * be read using this plugin.
275:             * 
276:             * @param source
277:             *            Object
278:             * @param hints
279:             *            {@link Hints} to control the reader behaviour.
280:             * @return An {@link ImagePyramidReader} if the provided object can be read
281:             *         using this plugin or null.
282:             */
283:            public GridCoverageReader getReader(Object source, Hints hints) {
284:                try {
285:
286:                    return new ImagePyramidReader(source, hints);
287:                } catch (MalformedURLException e) {
288:                    if (LOGGER.isLoggable(Level.SEVERE))
289:                        LOGGER
290:                                .severe(new StringBuffer(
291:                                        "impossible to get a reader for the provided source. The error is ")
292:                                        .append(e.getLocalizedMessage())
293:                                        .toString());
294:                    return null;
295:                } catch (IOException e) {
296:                    if (LOGGER.isLoggable(Level.SEVERE))
297:                        LOGGER
298:                                .severe(new StringBuffer(
299:                                        "impossible to get a reader for the provided source. The error is ")
300:                                        .append(e.getLocalizedMessage())
301:                                        .toString());
302:                    return null;
303:                }
304:            }
305:
306:            /**
307:             * Throw an exception since this plugin is readonly.
308:             * 
309:             * @return nothing.
310:             */
311:            public GeoToolsWriteParams getDefaultImageIOWriteParameters() {
312:                throw new UnsupportedOperationException("Unsupported method.");
313:            }
314:
315:        }
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