Source Code Cross Referenced for SubFeatureCollection.java in  » GIS » GeoTools-2.4.1 » org » geotools » feature » collection » 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.feature.collection 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2005-2006, 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;
009:         *    version 2.1 of the License.
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:        package org.geotools.feature.collection;
017:
018:        import java.io.IOException;
019:        import java.util.Iterator;
020:
021:        import org.geotools.data.FeatureReader;
022:        import org.geotools.data.collection.DelegateFeatureReader;
023:        import org.geotools.factory.CommonFactoryFinder;
024:        import org.geotools.feature.CollectionListener;
025:        import org.geotools.feature.Feature;
026:        import org.geotools.feature.FeatureCollection;
027:        import org.geotools.feature.FeatureIterator;
028:        import org.geotools.feature.FeatureList;
029:        import org.geotools.feature.FeatureType;
030:        import org.geotools.feature.IllegalAttributeException;
031:        import org.geotools.feature.visitor.FeatureVisitor;
032:        import org.geotools.geometry.jts.ReferencedEnvelope;
033:        import org.opengis.filter.Filter;
034:        import org.opengis.filter.FilterFactory;
035:        import org.opengis.filter.sort.SortBy;
036:        import org.geotools.util.ProgressListener;
037:
038:        import com.vividsolutions.jts.geom.Envelope;
039:        import com.vividsolutions.jts.geom.Geometry;
040:
041:        /**
042:         * Used as a reasonable default implementation for subCollection.
043:         * <p>
044:         * Note: to implementors, this is not optimal, please do your own
045:         * thing - your users will thank you.
046:         * </p>
047:         * 
048:         * @author Jody Garnett, Refractions Research, Inc.
049:         *
050:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/main/src/main/java/org/geotools/feature/collection/SubFeatureCollection.java $
051:         */
052:        public class SubFeatureCollection extends AbstractResourceCollection
053:                implements  FeatureCollection {
054:            /** Filter */
055:            protected Filter filter;
056:
057:            /** Origional Collection */
058:            protected FeatureCollection collection;
059:            protected FeatureState state;
060:            protected FilterFactory ff = CommonFactoryFinder
061:                    .getFilterFactory(null);
062:
063:            public SubFeatureCollection(FeatureCollection collection) {
064:                this (collection, null);
065:            }
066:
067:            public SubFeatureCollection(FeatureCollection collection,
068:                    Filter subfilter) {
069:                if (subfilter != null && subfilter.equals(Filter.EXCLUDE)) {
070:                    throw new IllegalArgumentException(
071:                            "A subcollection with Filter.EXCLUDE is a null operation");
072:                }
073:                if (subfilter != null && subfilter.equals(Filter.INCLUDE)) {
074:                    throw new IllegalArgumentException(
075:                            "A subcollection with Filter.INCLUDE should be a FeatureCollectionEmpty");
076:                }
077:                if (subfilter != null
078:                        && (collection instanceof  SubFeatureCollection)) {
079:                    SubFeatureCollection filtered = (SubFeatureCollection) collection;
080:                    this .collection = filtered.collection;
081:                    this .filter = ff.and(filtered.filter(), subfilter);
082:                } else {
083:                    this .collection = collection;
084:                    this .filter = subfilter;
085:                }
086:                state = new SubFeatureState(this .collection, this );
087:            }
088:
089:            protected Filter filter() {
090:                if (filter == null) {
091:                    filter = createFilter();
092:                }
093:                return filter;
094:            }
095:
096:            /** Override to implement subsetting */
097:            protected Filter createFilter() {
098:                return Filter.INCLUDE;
099:            }
100:
101:            public FeatureType getFeatureType() {
102:                return state.getFeatureType();
103:            }
104:
105:            public FeatureIterator features() {
106:                return new DelegateFeatureIterator(this , iterator());
107:            }
108:
109:            public void closeIterator(Iterator iterator) {
110:                if (iterator == null)
111:                    return;
112:
113:                if (iterator instanceof  FilteredIterator) {
114:                    FilteredIterator filtered = (FilteredIterator) iterator;
115:                    filtered.close();
116:                }
117:            }
118:
119:            public void close(FeatureIterator close) {
120:                if (close != null)
121:                    close.close();
122:            }
123:
124:            //
125:            // Feature methods
126:            //
127:            public String getID() {
128:                return state.getId();
129:            }
130:
131:            public ReferencedEnvelope getBounds() {
132:                return ReferencedEnvelope.reference(state.getBounds());
133:            }
134:
135:            public Geometry getDefaultGeometry() {
136:                return state.getDefaultGeometry();
137:            }
138:
139:            public void setDefaultGeometry(Geometry g)
140:                    throws IllegalAttributeException {
141:                state.setDefaultGeometry(g);
142:            }
143:
144:            public void addListener(CollectionListener listener)
145:                    throws NullPointerException {
146:                state.addListener(listener);
147:            }
148:
149:            public void removeListener(CollectionListener listener)
150:                    throws NullPointerException {
151:                state.removeListener(listener);
152:            }
153:
154:            public FeatureCollection getParent() {
155:                return state.getParent();
156:            }
157:
158:            public void setParent(FeatureCollection collection) {
159:                state.setParent(collection);
160:            }
161:
162:            public Object[] getAttributes(Object[] attributes) {
163:                return state.getAttributes(attributes);
164:            }
165:
166:            public Object getAttribute(String xPath) {
167:                return state.getAttribute(xPath);
168:            }
169:
170:            public Object getAttribute(int index) {
171:                return state.getAttribute(index);
172:            }
173:
174:            public void setAttribute(int position, Object val)
175:                    throws IllegalAttributeException,
176:                    ArrayIndexOutOfBoundsException {
177:                state.setAttribute(position, val);
178:            }
179:
180:            public int getNumberOfAttributes() {
181:                return state.getNumberOfAttributes();
182:            }
183:
184:            public void setAttribute(String xPath, Object attribute)
185:                    throws IllegalAttributeException {
186:                state.setAttribute(xPath, attribute);
187:            }
188:
189:            //
190:            //
191:            //
192:            public FeatureCollection subCollection(Filter filter) {
193:                if (filter.equals(Filter.INCLUDE)) {
194:                    return this ;
195:                }
196:                if (filter.equals(Filter.EXCLUDE)) {
197:                    // TODO implement EmptyFeatureCollection( schema )
198:                }
199:                return new SubFeatureCollection(this , filter);
200:            }
201:
202:            public int size() {
203:                int count = 0;
204:                Iterator i = null;
205:                try {
206:                    for (i = iterator(); i.hasNext(); count++)
207:                        i.next();
208:                } finally {
209:                    close(i);
210:                }
211:                return count;
212:            }
213:
214:            public boolean isEmpty() {
215:                Iterator iterator = iterator();
216:                try {
217:                    return !iterator.hasNext();
218:                } finally {
219:                    close(iterator);
220:                }
221:            }
222:
223:            public Iterator openIterator() {
224:                return new FilteredIterator(collection, filter());
225:            }
226:
227:            public FeatureType getSchema() {
228:                return collection.getSchema();
229:            }
230:
231:            /**
232:             * Accepts a visitor, which then visits each feature in the collection.
233:             * @throws IOException 
234:             */
235:            public void accepts(FeatureVisitor visitor,
236:                    ProgressListener progress) throws IOException {
237:                Iterator iterator = null;
238:                // if( progress == null ) progress = new NullProgressListener();
239:                try {
240:                    float size = size();
241:                    float position = 0;
242:                    progress.started();
243:                    for (iterator = iterator(); !progress.isCanceled()
244:                            && iterator.hasNext(); progress.progress(position++
245:                            / size)) {
246:                        try {
247:                            Feature feature = (Feature) iterator.next();
248:                            visitor.visit(feature);
249:                        } catch (Exception erp) {
250:                            progress.exceptionOccurred(erp);
251:                        }
252:                    }
253:                } finally {
254:                    progress.complete();
255:                    close(iterator);
256:                }
257:            }
258:
259:            public FeatureReader reader() throws IOException {
260:                return new DelegateFeatureReader(getSchema(), features());
261:            }
262:
263:            public int getCount() throws IOException {
264:                return size();
265:            }
266:
267:            public FeatureCollection collection() throws IOException {
268:                return this ;
269:            }
270:
271:            public FeatureList sort(SortBy order) {
272:                return null;
273:            }
274:
275:            public void purge() {
276:                collection.purge();
277:            }
278:        }
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