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/**
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* '$RCSfile$'
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* Copyright: 2003 Regents of the University of California.
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*
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* Author: Matthew Perry
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* '$Date: 2011-01-21 15:08:31 -0800 (Fri, 21 Jan 2011) $'
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* '$Revision: 5829 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.spatial;
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import org.geotools.data.shapefile.ShapefileDataStore;
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import org.geotools.data.FeatureStore;
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import org.geotools.data.DefaultTransaction;
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import org.geotools.data.Transaction;
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import org.geotools.filter.CompareFilter;
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import org.geotools.filter.FilterFactory;
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import org.geotools.filter.FilterFactoryFinder;
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import org.geotools.filter.IllegalFilterException;
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import org.geotools.feature.FeatureCollection;
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import org.geotools.feature.FeatureCollections;
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import org.opengis.feature.simple.SimpleFeature;
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import org.opengis.feature.simple.SimpleFeatureType;
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import org.apache.log4j.Logger;
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import java.io.File;
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import java.io.IOException;
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import java.net.URI;
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import java.net.URL;
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import java.net.MalformedURLException;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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/**
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* Class providing direct read/write access to the
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* persistent spatial cache.
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*/
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public class SpatialDataset {
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private static SpatialFeatureSchema featureSchema = new SpatialFeatureSchema();
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private static ShapefileDataStore polygonStore = null;
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private static ShapefileDataStore pointStore = null;
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private static FeatureStore featureStore = null;
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//public String polygonShpUri = PropertyService.getProperty("certPath") + "data/metacat_shps/data_bounds.shp";
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//public String pointShpUri = PropertyService.getProperty("certPath")+ "data/metacat_shps/data_points.shp";
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FeatureCollection polygonCollection = FeatureCollections.newCollection();
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FeatureCollection pointCollection = FeatureCollections.newCollection();
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private static Logger log =
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Logger.getLogger(SpatialDataset.class.getName());
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/**
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* empty constructor for SpatialDataset
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*/
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public SpatialDataset() throws IOException {
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polygonStore = new ShapefileDataStore( (new File( featureSchema.polygonShpUri)).toURL() );
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pointStore = new ShapefileDataStore( (new File( featureSchema.pointShpUri)).toURL() );
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}
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/**
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* Adds a new feature (from a SpatialDocument)
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* This is faster than insertOrUpdate but
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* relying on this method might cause duplication
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* of docids in the spatial cache. Therefore, its really only useful when
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* regenerating the entire cache.
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*
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* @param geomType The kind of feature to be added. Currently "polygon" and "point" supported.
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* @param feature The geotools feature to be added to the spatial cache.
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*/
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public void add( String geomType, SimpleFeature feature ) {
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if( geomType.equals("polygon") ) {
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// Check if feature actually is a multipolygon
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if( feature != null)
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polygonCollection.add( feature );
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} else if( geomType.equals("point") ) {
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// Check if feature actually is a multipoint
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if( feature != null)
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pointCollection.add( feature );
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}
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}
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/**
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* Deletes given docid from the spatial cache.
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*
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* @param geomType The kind of feature to be added. Currently "polygon" and "point" supported.
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* @param docid The document to be deleted from the spatial cache.
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*/
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public void delete( String geomType, String docid ) throws IOException {
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FilterFactory filterFactory = FilterFactoryFinder.createFilterFactory();
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CompareFilter filter = null;
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FeatureStore fStore = null;
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ShapefileDataStore dStore = null;
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try {
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// Create the filter
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filter = filterFactory.createCompareFilter(CompareFilter.COMPARE_EQUALS);
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filter.addLeftValue(filterFactory.createAttributeExpression("docid"));
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filter.addRightValue(filterFactory.createLiteralExpression(docid));
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} catch (IllegalFilterException e) {
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e.printStackTrace();
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throw new IOException(e.getMessage());
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}
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if( geomType.equals("polygon") ) {
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deleteFromDataStore(polygonStore, filter, docid);
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}else if( geomType.equals("point") ) {
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deleteFromDataStore(pointStore, filter, docid);
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}
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else
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{
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throw new IOException("Unkown Geo Type "+geomType);
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}
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}
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/*
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* Delete a feature from given spatail data store
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*/
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private void deleteFromDataStore(ShapefileDataStore dStore, CompareFilter filter, String docid)
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throws IOException
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{
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if (dStore != null && filter != null)
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{
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synchronized(dStore)
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{
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// Begin new transaction
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Transaction t = new DefaultTransaction("handle");
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t.putProperty( "updating spatial cache", new Integer(7) );
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String lockId = "SpatialDataset.delete";
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FeatureStore fStore = (FeatureStore) dStore.getFeatureSource(dStore.getTypeNames()[0]);
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try {
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if (fStore != null)
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{
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// Initiate the transaction
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fStore.setTransaction( t );
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t.addAuthorization( lockId );
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// Remove old feature
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fStore.removeFeatures( filter );
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// Commit changes to shapefile
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t.commit();
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log.info(" Delete docid " + docid + " from spatial cache");
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}
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else
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{
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log.error("Feature store is null");
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}
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} catch (MalformedURLException e) {
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e.printStackTrace();
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t.rollback(); // cancel opperations
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} catch (IOException e) {
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e.printStackTrace();
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t.rollback(); // cancel opperations
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} finally {
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// Close out the transaction
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t.close();
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}
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}
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}
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else if (dStore == null)
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{
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log.error("Shape file store is null");
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}
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}
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/**
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* Either inserts or updates the spatial cache with the new
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* spatial document depending on if it currently exists.
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* Docid is also passed in for quicker searching.
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*
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* @param geomType The kind of feature to be added. Currently "polygon" and "point" supported.
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* @param feature The geotools feature to be added to the spatial cache.
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* @param docid The document id to be inserted or updated. Used to filter for existing features.
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*/
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public void insertOrUpdate( String geomType, SimpleFeature feature, String docid ) throws IOException {
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FeatureCollection fColl = FeatureCollections.newCollection();
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FilterFactory filterFactory = FilterFactoryFinder.createFilterFactory();
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CompareFilter filter = null;
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FeatureStore fStore = null;
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ShapefileDataStore dStore = null;
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// Explain why geotools fails to create the projection info from the shapefile
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//log.info( " The '.prj' errors below are related to a geotools bug " +
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// " (http://jira.codehaus.org/browse/GEOT-604) and can be ignored");
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try {
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// Create the filter
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filter = filterFactory.createCompareFilter(CompareFilter.COMPARE_EQUALS);
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filter.addLeftValue(filterFactory.createAttributeExpression("docid"));
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filter.addRightValue(filterFactory.createLiteralExpression(docid));
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} catch (IllegalFilterException e) {
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e.printStackTrace();
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throw new IOException(e.getMessage());
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}
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if( geomType.equals("polygon") ) {
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log.debug("SpatialDataset.insertOrUpdate - inserting or updating polygon store");
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insertOrUpdateDataStore(polygonStore,filter, feature, fColl, docid);
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} else if( geomType.equals("point") ) {
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log.debug("SpatialDataset.insertOrUpdate - inserting or updating point store");
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insertOrUpdateDataStore(pointStore,filter, feature, fColl, docid);
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}else{
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throw new IOException("Unkown Geo Type "+geomType);
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}
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}
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/*
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* Insert or update new feature in shape file
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*/
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private void insertOrUpdateDataStore(ShapefileDataStore dStore, CompareFilter filter, SimpleFeature feature,
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FeatureCollection fColl, String docid) throws IOException
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{
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if (dStore != null && filter != null && feature != null && fColl != null)
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{
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synchronized(dStore)
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{
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// Begin new transaction
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Transaction t = new DefaultTransaction("handle");
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t.putProperty( "updating spatial cache", new Integer(7) );
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String lockId = "SpatialDataset.insertOrUpdate";
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try {
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FeatureStore fStore = (FeatureStore) dStore.getFeatureSource(dStore.getTypeNames()[0]);
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if( fStore != null) {
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// Initiate the transaction
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fStore.setTransaction( t );
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t.addAuthorization( lockId );
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// Remove old feature
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fStore.removeFeatures( filter );
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// Create new feature collection then add it to feature Store
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fColl.add( feature );
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fStore.addFeatures(fColl);
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// Commit changes to shapefile
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t.commit();
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log.info(" Insert or Update docid " + docid + " from spatial cache");
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}
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else
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{
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log.error("Feature store is null");
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}
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} catch (MalformedURLException e) {
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e.printStackTrace();
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t.rollback(); // cancel operations
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} catch (IOException e) {
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e.printStackTrace();
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t.rollback(); // cancel operations
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} catch (Exception e) {
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e.printStackTrace();
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t.rollback(); // cancel operations
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} finally {
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// Close out the transaction
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t.close();
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}
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}
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}
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else if (dStore == null)
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{
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log.error("Shape file store is null");
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}
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}
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/**
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* Saves the SpatialDataset object to the spatial cache.
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*/
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public void save() {
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// Save Polygons
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try {
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//URL anURL = (new File( featureSchema.polygonShpUri )).toURL();
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//ShapefileDataStore polygonDatastore = new ShapefileDataStore(anURL);
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if (polygonStore != null)
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{
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synchronized(polygonStore)
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{
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SimpleFeatureType polygonType = featureSchema.getPolygonFeatureType();
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polygonStore.createSchema( polygonType );
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FeatureStore polygonFeatureStore = (FeatureStore) polygonStore.getFeatureSource( polygonType.getTypeName() );
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polygonFeatureStore.addFeatures( polygonCollection );
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log.info(" ---- Polygons saved to " + featureSchema.polygonShpUri );
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}
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}
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else
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{
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log.error("Couldn't find the polygon shape file store");
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}
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} catch(java.net.MalformedURLException e) {
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log.error("Malformed URL Exception : "+e);
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} catch(java.io.IOException e) {
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log.error("IO Exception : "+e);
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331
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}
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// Save Points
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try {
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//URL anURL = (new File( featureSchema.pointShpUri )).toURL();
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//ShapefileDataStore pointDatastore = new ShapefileDataStore(anURL);
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if (pointStore != null)
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{
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synchronized(pointStore)
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{
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SimpleFeatureType pointsType = featureSchema.getPointFeatureType();
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pointStore.createSchema( pointsType );
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FeatureStore pointFeatureStore = (FeatureStore) pointStore.getFeatureSource( pointsType.getTypeName() );
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pointFeatureStore.addFeatures( pointCollection );
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log.info(" ---- Polygons saved to " + featureSchema.pointShpUri );
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}
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}
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else
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{
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log.error("Couldn't find the shape point file store");
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}
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} catch(java.net.MalformedURLException e) {
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log.error("Malformed URL Exception : "+e);
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} catch(java.io.IOException e) {
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log.error("IO Exception : "+e);
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}
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}
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359
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361
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}
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