Source Code Cross Referenced for IndexView.java in  » GIS » GeoTools-2.4.1 » org » geotools » caching » impl » 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.caching.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2002-2006, 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.caching.impl;
017:
018:        import com.vividsolutions.jts.geom.Envelope;
019:
020:        import org.geotools.caching.FeatureIndex;
021:
022:        import org.geotools.data.DataStore;
023:        import org.geotools.data.DefaultQuery;
024:        import org.geotools.data.FeatureListener;
025:        import org.geotools.data.FeatureSource;
026:        import org.geotools.data.Query;
027:
028:        import org.geotools.feature.FeatureCollection;
029:        import org.geotools.feature.FeatureType;
030:
031:        import org.opengis.filter.Filter;
032:
033:        import java.io.IOException;
034:
035:        /** Associates a FeatureIndex with a query.
036:         * This is used to get a view from the index,
037:         * ie. a subset of the features containes in the index.
038:         *
039:         * If more features are added to the underlying FeatureIndex,
040:         * after instance is created, instance will reflect new set,
041:         * as it delegates actual process to the FeatureIndex.
042:         *
043:         * @task implements private method : Query restrict(Query q)
044:         *
045:         * @author Christophe Rousson, SoC 2007, CRG-ULAVAL
046:         *
047:         */
048:        public class IndexView implements  FeatureSource {
049:            private final FeatureIndex index;
050:            private final Query view;
051:
052:            /** Associates FeatureIndex with Query.
053:             *
054:             * @param index a FeatureIndex
055:             * @param q Query
056:             */
057:            public IndexView(FeatureIndex index, Query q) {
058:                this .index = index;
059:                this .view = q;
060:            }
061:
062:            /** Creates a dummy view with all features,
063:             * yielding all features within the FeatureIndex
064:             *
065:             * @param index FeatureIndex on which to build the view.
066:             *
067:             */
068:            public IndexView(FeatureIndex index) {
069:                this (index, Query.ALL);
070:            }
071:
072:            /********************************************************
073:             **
074:             ** Next methods delegate process to FeatureIndex.
075:             **
076:             ********************************************************/
077:            public void addFeatureListener(FeatureListener arg0) {
078:                // TODO Auto-generated method stub
079:            }
080:
081:            public Envelope getBounds() throws IOException {
082:                // TODO Auto-generated method stub
083:                return index.getBounds(view);
084:            }
085:
086:            public Envelope getBounds(Query q) throws IOException {
087:                // TODO Auto-generated method stub
088:                return index.getBounds(restrict(q));
089:            }
090:
091:            public int getCount(Query q) throws IOException {
092:                // TODO Auto-generated method stub
093:                return index.getCount(restrict(q));
094:            }
095:
096:            public DataStore getDataStore() {
097:                // TODO Auto-generated method stub
098:                return index.getDataStore();
099:            }
100:
101:            /* (non-Javadoc)
102:             * @see org.geotools.data.FeatureSource#getFeatures()
103:             *
104:             * Get FeatureCollection associated with view from the FeatureIndex.
105:             *
106:             */
107:            public FeatureCollection getFeatures() throws IOException {
108:                // TODO Auto-generated method stub
109:                return index.getFeatures(view);
110:            }
111:
112:            public FeatureCollection getFeatures(Query q) throws IOException {
113:                return index.getFeatures(restrict(q));
114:            }
115:
116:            public FeatureCollection getFeatures(Filter f) throws IOException {
117:                // TODO Auto-generated method stub
118:                return index.getFeatures(new DefaultQuery("", f));
119:            }
120:
121:            public FeatureType getSchema() {
122:                return index.getSchema();
123:            }
124:
125:            public void removeFeatureListener(FeatureListener arg0) {
126:                // TODO Auto-generated method stub
127:            }
128:
129:            /** Actually does nothing,
130:             * but ideally would return a new query
131:             * defined by ((view query) AND (input query))
132:             *
133:             * @param q a Query
134:             * @return new Query
135:             */
136:            private Query restrict(Query q) {
137:                // TODO combine view query and new query
138:                return q;
139:            }
140:        }
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