Examples of org.geotools.caching.grid.spatialindex.GridSpatialIndex

Package org.geotools.caching.grid.spatialindex

Examples of org.geotools.caching.grid.spatialindex.GridSpatialIndex

org.geotools.caching.grid.spatialindex.GridSpatialIndex
A grid implementation of SpatialIndex. A grid is a regular division of space, and is implemented as a very simple tree. It has two levels, a top level consisting of one root node, and a bottom level of nodes of the same size forming a grid. Data is either inserted at the top level or at the bottom level, and may be inserted more than once, if data intersects more than one node. If data's shape is too big, it is inserted at the top level. For the grid to be efficient, data should evenly distributed in size and in space, and grid size should twice the mean size of data's shape. @author Christophe Rousson, SoC 2007, CRG-ULAVAL @source $URL$

    TestNode n;
    RegionNodeIdentifier id;
    GridSpatialIndex grid;


    protected void setUp() {
        grid = new GridSpatialIndex(new Region(new double[] { 0, 0 }, new double[] { 1, 1 }), 10,
                MemoryStorage.createInstance(), 200);
        n = new TestNode(grid, new Region(new double[] { 0, 0 }, new double[] { 1, 1 }));
        id = new RegionNodeIdentifier(n);
        store = createStorage();
    }

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     * @param capacity       maximum number of features to cache
     * @param store         the cache storage
     */
    public GridFeatureCache(SimpleFeatureSource fs, ReferencedEnvelope env, int gridsize, int capacity, Storage store){
        super(fs);
        tracker = new GridSpatialIndex(CacheUtil.convert(env), gridsize, store, capacity);
        this.capacity = capacity;


        //lets compare the feature type in the store to the feature type of the current feature source
        //if they differ we need to  clear the cache as the features have changed.
        if (store.getFeatureTypes().size() == 0){

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        return this.cache;
    }
    
    
    public void testRegister() { 
        GridSpatialIndex index = (GridSpatialIndex)((GridFeatureCache)cache).getIndex();
        double tilesize = index.getRootNode().getTileSize();
        Region r = (Region)index.getRootNode().getShape();
        
        //matches all 
        Envelope e = new Envelope(r.getLow(0), r.getHigh(0), r.getLow(1), r.getHigh(1));
        List<Envelope> matches = cache.match(e);
        assertEquals(1, matches.size());

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Related Classes of org.geotools.caching.grid.spatialindex.GridSpatialIndex

org.geotools.caching.grid.featurecache.DiskGridFeatureCacheTest

org.geotools.caching.grid.featurecache.GridFeatureCache

org.geotools.caching.LRUEvictionPolicy

org.geotools.caching.spatialindex.Node

org.geotools.caching.spatialindex.NodeIdentifier

org.geotools.caching.spatialindex.Region

org.geotools.caching.spatialindex.RegionNodeIdentifier

org.geotools.caching.spatialindex.Storage

org.geotools.caching.spatialindex.store.AbstractStorageTest

org.geotools.geometry.jts.ReferencedEnvelope

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