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


01:        /*
02:         *    GeoTools - OpenSource mapping toolkit
03:         *    http://geotools.org
04:         *    (C) 2002-2006, GeoTools Project Managment Committee (PMC)
05:         *
06:         *    This library is free software; you can redistribute it and/or
07:         *    modify it under the terms of the GNU Lesser General Public
08:         *    License as published by the Free Software Foundation;
09:         *    version 2.1 of the License.
10:         *
11:         *    This library is distributed in the hope that it will be useful,
12:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14:         *    Lesser General Public License for more details.
15:         */
16:        package org.geotools.caching;
17:
18:        import org.geotools.data.FeatureSource;
19:        import org.geotools.data.Query;
20:
21:        import org.geotools.feature.Feature;
22:        import org.geotools.feature.FeatureCollection;
23:        import org.geotools.feature.SchemaException;
24:
25:        import java.io.IOException;
26:
27:        /** Provides an indexed store where to keep features
28:         * on behalf of a DataCache.
29:         * Features are likely to be stored by ID, but
30:         * indexation can be used to speed the lookup of features in the cache.
31:         * Implementation will choose the indexation method that fits best with the purpose of the cache.
32:         * An index instance should store only one type of feature.
33:         *
34:         * @author Christophe Rousson, SoC 2007, CRG-ULAVAL
35:         *
36:         */
37:        public interface FeatureIndex extends FeatureSource {
38:            /** Store a Feature in the index.
39:             *
40:             * @param f the feature to store
41:             */
42:            public abstract void add(Feature f);
43:
44:            /** Get a feature by its ID.
45:             *
46:             * @param featureID the id of the feature to retrieve.
47:             * @return
48:             */
49:            public abstract Feature get(String featureID);
50:
51:            /** Delete a feature from the index.
52:             *
53:             * @param featureID the id of the feature to remove.
54:             */
55:            public abstract void remove(String featureID);
56:
57:            /** Delete all features from the index.
58:             *
59:             */
60:            public abstract void clear();
61:
62:            /* (non-Javadoc)
63:             * @see org.geotools.data.FeatureSource#getFeatures(org.geotools.data.Query)
64:             */
65:            public abstract FeatureCollection getFeatures(Query q)
66:                    throws IOException;
67:
68:            /** Return a FeatureSource from where to get the features yielded by query q.
69:             *
70:             * @param q the query defining the view, ie a selection of the features in the index.
71:             * @return
72:             */
73:            public abstract FeatureSource getView(Query q)
74:                    throws SchemaException;
75:        }
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