Source Code Cross Referenced for VPFFeatureReader.java in  » GIS » GeoTools-2.4.1 » org » geotools » data » vpf » 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.data.vpf 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2004-2006, Geotools Project Managment Committee (PMC)
005:         *
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation; either
009:         *    version 2.1 of the License, or (at your option) any later version.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         *    
016:         *    Created on 13. april 2004, 14:35
017:         */
018:        package org.geotools.data.vpf;
019:
020:        import java.io.File;
021:        import java.io.IOException;
022:        import java.sql.SQLException;
023:        import java.util.HashMap;
024:        import java.util.Iterator;
025:        import java.util.Map;
026:        import java.util.NoSuchElementException;
027:
028:        import org.geotools.data.FeatureReader;
029:        import org.geotools.data.vpf.file.VPFFile;
030:        import org.geotools.data.vpf.file.VPFFileFactory;
031:        import org.geotools.data.vpf.ifc.FCode;
032:        import org.geotools.feature.AttributeType;
033:        import org.geotools.feature.Feature;
034:        import org.geotools.feature.FeatureType;
035:        import org.geotools.feature.IllegalAttributeException;
036:        import org.geotools.feature.type.AnnotationFeatureType;
037:
038:        /**
039:         *
040:         * @author  <a href="mailto:knuterik@onemap.org">Knut-Erik Johnsen</a>, Project OneMap
041:         * @author Chris Holmes, Fulbright.
042:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/unsupported/vpf/src/main/java/org/geotools/data/vpf/VPFFeatureReader.java $
043:         */
044:        public class VPFFeatureReader implements  FeatureReader, FCode {
045:            private boolean hasNext = true;
046:            private boolean nextCalled = true;
047:            private Feature currentFeature = null;
048:            private final VPFFeatureType featureType;
049:
050:            /** Creates a new instance of VPFFeatureReader */
051:            public VPFFeatureReader(VPFFeatureType type) {
052:                this .featureType = type;
053:            }
054:
055:            /* (non-Javadoc)
056:             * @see org.geotools.data.FeatureReader#close()
057:             */
058:            public void close() throws IOException {
059:                reset();
060:            }
061:
062:            /**
063:             * Put together a map of VPF files and their corresponding
064:             * TableRows
065:             * 
066:             * @param file
067:             * @param row
068:             */
069:            private Map generateFileRowMap(VPFFile file, Feature row)
070:                    throws IOException {
071:                String tileFileName = null;
072:                Map rows = new HashMap();
073:                rows.put(file, row);
074:                Iterator joinIter = featureType.getFeatureClass().getJoinList()
075:                        .iterator();
076:                while (joinIter.hasNext()) {
077:                    ColumnPair columnPair = (ColumnPair) joinIter.next();
078:                    VPFFile primaryFile = getVPFFile(columnPair.column1);
079:                    VPFFile joinFile = null;
080:                    joinFile = getVPFFile(columnPair.column2);
081:
082:                    if (!rows.containsKey(joinFile)
083:                            && rows.containsKey(primaryFile)) {
084:                        Feature joinRow = (Feature) rows.get(primaryFile);
085:
086:                        try {
087:                            int joinID = Integer.parseInt(joinRow.getAttribute(
088:                                    columnPair.column1.getName()).toString());
089:                            rows.put(joinFile, getVPFFile(columnPair.column2)
090:                                    .getRowFromId(columnPair.column2.getName(),
091:                                            joinID));
092:                        } catch (NullPointerException exc) {
093:                            // Non-matching joins - just put in a NULL
094:                            rows.put(joinFile, null);
095:                        } catch (IllegalAttributeException exc) {
096:                            // I really don't expect to see this one
097:                            exc.printStackTrace();
098:                            rows.put(joinFile, null);
099:                        }
100:                    }
101:                }
102:                return rows;
103:
104:            }
105:
106:            /* (non-Javadoc)
107:             * @see org.geotools.data.FeatureReader#getFeatureType()
108:             */
109:            public FeatureType getFeatureType() {
110:                return featureType;
111:            }
112:
113:            /* (non-Javadoc)
114:             * @see org.geotools.data.FeatureReader#hasNext()
115:             */
116:            public boolean hasNext() throws IOException {
117:                if (nextCalled) {
118:                    while (readNext())
119:                        ;
120:                    nextCalled = false;
121:                }
122:                return hasNext;
123:            }
124:
125:            /* (non-Javadoc)
126:             * @see org.geotools.data.FeatureReader#next()
127:             */
128:            public Feature next() throws IOException,
129:                    IllegalAttributeException, NoSuchElementException {
130:                nextCalled = true;
131:                return currentFeature;
132:            }
133:
134:            /**
135:             * Read a row and determine if it matches the feature type
136:             * Three possibilities here:
137:             * row is null -- hasNext = false, do not try again
138:             * row matches -- hasNext = true, do not try again
139:             * row does not match -- hasNext is undefined because we must try again
140:             * @return Whether we need to read again
141:             */
142:            private boolean readNext() throws IOException {
143:                boolean result = true;
144:                VPFFile file = (VPFFile) featureType.getFeatureClass()
145:                        .getFileList().get(0);
146:                hasNext = false;
147:                Feature row = null;
148:                try {
149:                    if (file.hasNext()) {
150:                        row = file.readFeature();
151:                    }
152:                } catch (IOException exc1) {
153:                    // TODO Auto-generated catch block
154:                    exc1.printStackTrace();
155:                } catch (IllegalAttributeException exc1) {
156:                    // TODO Auto-generated catch block
157:                    exc1.printStackTrace();
158:                }
159:                if ((row == null)) {
160:                    hasNext = false;
161:                    result = false;
162:                }
163:                // Exclude objects with a different FACC Code
164:                else if (featureType.getFaccCode() != null) {
165:                    try {
166:                        Object temp = null;
167:                        for (int i = 0; temp == null
168:                                && i < ALLOWED_FCODE_ATTRIBUTES.length; i++) {
169:                            temp = row
170:                                    .getAttribute(ALLOWED_FCODE_ATTRIBUTES[i]);
171:                        }
172:                        String faccCode = temp.toString().trim();
173:                        if (featureType.getFaccCode().equals(faccCode)) {
174:                            retrieveObject(file, row);
175:                            hasNext = true;
176:                            result = false;
177:                        }
178:                    } catch (RuntimeException exc) {
179:                        // Ignore this case because it typically means the f_code is invalid
180:                    }
181:                }
182:                return result;
183:            }
184:
185:            /** 
186:             * Get the values from all of the columns
187:             * based on their presence (or absense) in the rows
188:             *
189:             * Potential cases:
190:             * simple column
191:             * join column
192:             * non-matching join
193:             * null value
194:             * geometry
195:             * 
196:             * @param file the file
197:             * @param row the row
198:             *
199:             */
200:            private void retrieveObject(VPFFile file, Feature row)
201:                    throws IOException {
202:                VPFFile secondFile = null;
203:                VPFColumn column = null;
204:                Map rows = generateFileRowMap(file, row);
205:                AttributeType[] attributes = featureType.getFeatureClass()
206:                        .getAttributeTypes();
207:                Object[] values = new Object[featureType.getAttributeCount()];
208:                Object value = null;
209:                String featureId = null;
210:                // Pass 1 - identify the feature identifier
211:                for (int inx = 0; inx < attributes.length; inx++) {
212:                    // I am thinking it is probably safer to look this up 
213:                    // by column name than by position, but if it breaks,
214:                    // it is easy enough to change
215:                    if (attributes[inx].getName().equals("id")) {
216:                        value = row.getAttribute(inx);
217:                        if (value != null) {
218:                            featureId = value.toString();
219:                        }
220:                        break;
221:                    }
222:                }
223:                try {
224:                    currentFeature = featureType.create(values, featureId);
225:                } catch (IllegalAttributeException exc) {
226:                    // This shouldn't happen since everything should be nillable
227:                    exc.printStackTrace();
228:                }
229:
230:                // Pass 2 - get the attributes, including the geometry
231:                for (int inx = 0; inx < attributes.length; inx++) {
232:                    try {
233:                        if (attributes[inx]
234:                                .getName()
235:                                .equals(
236:                                        AnnotationFeatureType.ANNOTATION_ATTRIBUTE_NAME)) {
237:                            try {
238:                                //TODO: are we sure this is the intended action? Hard-coding an attribute to "nam"?
239:                                currentFeature.setAttribute(inx, "nam");
240:                            } catch (IllegalAttributeException exc) {
241:                                exc.printStackTrace();
242:                            }
243:                            continue;
244:                        }
245:                        column = (VPFColumn) attributes[inx];
246:                        value = null;
247:                        secondFile = getVPFFile(column);
248:                        Feature tempRow = (Feature) rows.get(secondFile);
249:                        if (tempRow != null) {
250:                            value = tempRow.getAttribute(column.getName());
251:                            if (column.isAttemptLookup()) {
252:                                try {
253:                                    // Attempt to perform a lookup and conversion
254:                                    String featureClassName = getVPFFile(column)
255:                                            .getFileName();
256:                                    String intVdtFileName = featureType
257:                                            .getFeatureClass()
258:                                            .getDirectoryName().concat(
259:                                                    File.separator).concat(
260:                                                    "int.vdt");
261:                                    VPFFile intVdtFile = VPFFileFactory
262:                                            .getInstance().getFile(
263:                                                    intVdtFileName);
264:                                    Iterator intVdtIter = intVdtFile
265:                                            .readAllRows().iterator();
266:                                    while (intVdtIter.hasNext()) {
267:                                        Feature intVdtRow = (Feature) intVdtIter
268:                                                .next();
269:                                        if (intVdtRow.getAttribute("table")
270:                                                .toString().trim().equals(
271:                                                        featureClassName)
272:                                                && (Short.parseShort(intVdtRow
273:                                                        .getAttribute("value")
274:                                                        .toString()) == Short
275:                                                        .parseShort(value
276:                                                                .toString()) && (intVdtRow
277:                                                        .getAttribute(
278:                                                                "attribute")
279:                                                        .toString().trim()
280:                                                        .equals(column
281:                                                                .getName())))) {
282:                                            value = intVdtRow.getAttribute(
283:                                                    "description").toString()
284:                                                    .trim();
285:                                            break;
286:                                        }
287:                                    }
288:                                    // If there is a problem, forget about mapping and continue
289:                                } catch (IOException exc) {
290:                                } catch (RuntimeException exc) {
291:                                }
292:                            }
293:                        }
294:                        try {
295:                            currentFeature.setAttribute(inx, value);
296:                        } catch (ArrayIndexOutOfBoundsException exc) {
297:                            // TODO Auto-generated catch block
298:                            exc.printStackTrace();
299:                        } catch (IllegalAttributeException exc) {
300:                            // TODO Auto-generated catch block
301:                            exc.printStackTrace();
302:                        }
303:                    } catch (ClassCastException exc2) {
304:                        try {
305:                            // This is the area geometry case
306:                            featureType
307:                                    .getFeatureClass()
308:                                    .getGeometryFactory()
309:                                    .createGeometry(featureType, currentFeature);
310:                        } catch (IllegalAttributeException exc) {
311:                            // TODO Auto-generated catch block
312:                            exc.printStackTrace();
313:                        } catch (SQLException exc) {
314:                            // TODO Auto-generated catch block
315:                            exc.printStackTrace();
316:                        }
317:                    }
318:                }
319:
320:            }
321:
322:            /**
323:             * Returns the VPFFile for a particular column.
324:             * It will only find the first match, but that should be okay
325:             * because duplicate columns will cause even bigger problems elsewhere.
326:             * @param column the column to search for 
327:             * @return the VPFFile that owns this column
328:             */
329:            private VPFFile getVPFFile(AttributeType column) {
330:                VPFFile result = null;
331:                VPFFile temp;
332:                Iterator iter = featureType.getFeatureClass().getFileList()
333:                        .iterator();
334:                while (iter.hasNext()) {
335:                    temp = (VPFFile) iter.next();
336:                    if ((temp != null) && (temp.find(column) >= 0)) {
337:                        result = temp;
338:                        break;
339:                    }
340:                }
341:                return result;
342:            }
343:
344:            /**
345:             * Need to reset the stream for the next time Resets the iterator by
346:             * resetting the stream.
347:             * 
348:             */
349:            public void reset() {
350:                VPFFile file = (VPFFile) featureType.getFeatureClass()
351:                        .getFileList().get(0);
352:                file.reset();
353:                VPFFileFactory.getInstance().reset();
354:            }
355:        }
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