/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.data.gen;
import java.awt.RenderingHints.Key;
import java.io.IOException;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.Map.Entry;
import java.util.logging.Logger;
import org.geotools.data.DataAccess;
import org.geotools.data.DataStore;
import org.geotools.data.DefaultResourceInfo;
import org.geotools.data.FeatureListener;
import org.geotools.data.FeatureListenerManager;
import org.geotools.data.FeatureReader;
import org.geotools.data.Query;
import org.geotools.data.QueryCapabilities;
import org.geotools.data.Repository;
import org.geotools.data.ResourceInfo;
import org.geotools.data.Transaction;
import org.geotools.data.gen.info.Generalization;
import org.geotools.data.gen.info.GeneralizationInfo;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.factory.Hints;
import org.geotools.feature.NameImpl;
import org.geotools.feature.simple.SimpleFeatureTypeImpl;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.util.logging.Logging;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.GeometryDescriptor;
import org.opengis.feature.type.Name;
import org.opengis.filter.Filter;
import org.opengis.filter.sort.SortBy;
/**
* @author Christian Mueller
*
* Feature source for a feature type with pregeneralized geometries
*
* This featue store does business as usual with the exception described here
* {@link PreGeneralizedDataStore}
*
*
*
*
*
* @source $URL$
*/
public class PreGeneralizedFeatureSource implements SimpleFeatureSource {
protected FeatureListenerManager listenerManager = new FeatureListenerManager();
protected Repository repository;
protected GeneralizationInfo info;
protected PreGeneralizedDataStore dataStore;
protected Logger log = Logging.getLogger(this.getClass());
private SimpleFeatureSource baseFeatureSource;
private Set<Key> supportedHints;
private Map<Generalization, SimpleFeatureSource> featureSourceCache;
private QueryCapabilities queryCapabilities;
private SimpleFeatureTypeImpl featureTyp;
private Map<Double, int[]> indexMapping;
private DefaultResourceInfo ri = null;
public PreGeneralizedFeatureSource(GeneralizationInfo info, Repository repository,
PreGeneralizedDataStore dataStore) {
this.info = info;
this.repository = repository;
this.dataStore = dataStore;
reset();
}
private void dsNotFoundException(String wsName, String dsName) throws IOException {
String msg = "Data store named " + dsName;
if (wsName != null)
msg += " in workspace " + wsName;
msg += " not found";
throw new IOException(msg);
}
public void reset() {
baseFeatureSource = null;
featureSourceCache = new HashMap<Generalization, SimpleFeatureSource>();
indexMapping = new HashMap<Double, int[]>();
supportedHints = null;
queryCapabilities = null;
featureTyp = null;
}
private SimpleFeatureSource getBaseFeatureSource()
throws IOException {
if (baseFeatureSource != null)
return baseFeatureSource;
DataStore ds = repository.dataStore(new NameImpl(info.getDataSourceNameSpace(), info
.getDataSourceName()));
if (ds == null)
dsNotFoundException(info.getDataSourceNameSpace(), info.getDataSourceName());
baseFeatureSource = ds.getFeatureSource(info.getBaseFeatureName());
// calculate indexMapping
int[] mapping = calculateIndexMapping(baseFeatureSource.getSchema(), info
.getGeomPropertyName(), info.getGeomPropertyName());
indexMapping.put(0.0, mapping);
return baseFeatureSource;
}
private int[] calculateIndexMapping(SimpleFeatureType backendType, String geomProperyName,
String backendGeomPropertyName) throws IOException {
int[] mapping = new int[getSchema().getAttributeCount()];
outer: for (int i = 0; i < mapping.length; i++) {
String attrName = getSchema().getAttributeDescriptors().get(i).getLocalName();
if (attrName.equals(geomProperyName))
attrName = backendGeomPropertyName;
for (int j = 0; j < backendType.getAttributeDescriptors().size(); j++) {
if (backendType.getAttributeDescriptors().get(j).getLocalName().equals(attrName)) {
mapping[i] = j;
continue outer;
}
}
throw new IOException("No attribute " + attrName + " found in "
+ backendType.getTypeName());
}
return mapping;
}
public void addFeatureListener(FeatureListener listener) {
listenerManager.addFeatureListener(this, listener);
}
public ReferencedEnvelope getBounds() throws IOException {
return getBounds(Query.ALL);
}
public ReferencedEnvelope getBounds(Query query) throws IOException {
// SimpleFeatureSource fs = getFeatureSourceFor(query);
// Query newQuery=getProxyObject(query, fs);
// return fs.getBounds(newQuery);
Query newQuery = getProxyObject(query, getBaseFeatureSource());
return getBaseFeatureSource().getBounds(newQuery);
}
public int getCount(Query query) throws IOException {
// SimpleFeatureSource fs = getFeatureSourceFor(query);
// Query newQuery=getProxyObject(query, fs);
// return fs.getCount(newQuery);
Query newQuery = getProxyObject(query, getBaseFeatureSource());
return getBaseFeatureSource().getCount(newQuery);
}
public DataAccess<SimpleFeatureType, SimpleFeature> getDataStore() {
return dataStore;
}
public SimpleFeatureCollection getFeatures() throws IOException {
return new PreGeneralizedFeatureCollection(getBaseFeatureSource().getFeatures(),
getSchema(), indexMapping.get(0.0), info.getGeomPropertyName(), info
.getGeomPropertyName());
}
public SimpleFeatureCollection getFeatures(Filter filter)
throws IOException {
return new PreGeneralizedFeatureCollection(getBaseFeatureSource().getFeatures(filter),
getSchema(), indexMapping.get(0.0), info.getGeomPropertyName(), info
.getGeomPropertyName());
}
public SimpleFeatureCollection getFeatures(Query query)
throws IOException {
SimpleFeatureSource fs = getFeatureSourceFor(query);
Query newQuery = getProxyObject(query, fs);
Generalization di = info.getGeneralizationForDistance(getRequestedDistance(query));
if (di != null)
logDistanceInfo(di);
return new PreGeneralizedFeatureCollection(fs.getFeatures(newQuery), getSchema(),
indexMapping.get(di == null ? 0.0 : di.getDistance()), info.getGeomPropertyName(),
getBackendGeometryName(fs));
}
public FeatureReader<SimpleFeatureType, SimpleFeature> getFeatureReader(Query query,
Transaction transaction) throws IOException {
SimpleFeatureSource fs = getFeatureSourceFor(query);
Query newQuery = getProxyObject(query, fs);
DataAccess<SimpleFeatureType, SimpleFeature> access = fs.getDataStore();
if (access instanceof DataStore) {
FeatureReader<SimpleFeatureType, SimpleFeature> backendReader = ((DataStore) access)
.getFeatureReader(newQuery, transaction);
String backendGeometryPropertyName = getBackendGeometryName(fs);
Generalization di = info.getGeneralizationForDistance(getRequestedDistance(query));
if (di != null)
logDistanceInfo(di);
return new PreGeneralizedFeatureReader(getSchema(), indexMapping.get(di == null ? 0.0
: di.getDistance()), backendReader, info.getGeomPropertyName(),
backendGeometryPropertyName);
}
return null;
}
public ResourceInfo getInfo() {
if (ri != null)
return ri;
try {
ri = new DefaultResourceInfo(); // copy from basefeature
ri.setBounds(getBaseFeatureSource().getBounds());
if (getBaseFeatureSource().getSchema().getGeometryDescriptor() != null)
ri.setCRS(getBaseFeatureSource().getSchema().getGeometryDescriptor()
.getCoordinateReferenceSystem());
ri.setDescription(getBaseFeatureSource().getInfo().getDescription());
// TODO, causes URI Exception
// ri.setSchema(getBaseFeatureSource().getInfo().getSchema());
ri.setTitle(getBaseFeatureSource().getInfo().getTitle());
ri.setName(getName().getLocalPart());
Set<String> keyWords = new TreeSet<String>();
keyWords.addAll(getBaseFeatureSource().getInfo().getKeywords());
keyWords.add("pregeneralized)");
ri.setKeywords(keyWords);
} catch (IOException ex) {
ri = null;
throw new RuntimeException(ex);
}
return ri;
}
public Name getName() {
return new NameImpl(dataStore.getNamespace() == null ? null : dataStore.getNamespace()
.toString(), info.getFeatureName());
}
/*
* (non-Javadoc)
*
* @see org.geotools.data.FeatureSource#getQueryCapabilities() A query capabilitiy is supported
* only if ALL backend feature sources support it
*/
public QueryCapabilities getQueryCapabilities() {
if (queryCapabilities != null)
return queryCapabilities;
queryCapabilities = new QueryCapabilities() {
@Override
public boolean isOffsetSupported() {
try {
if (!getBaseFeatureSource().getQueryCapabilities().isOffsetSupported())
return false;
for (Generalization di : info.getGeneralizations()) {
SimpleFeatureSource fs = getFeatureSourceFor(di);
if (!fs.getQueryCapabilities().isOffsetSupported())
return false;
}
return true;
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
@Override
public boolean isReliableFIDSupported() {
try {
if (!getBaseFeatureSource().getQueryCapabilities().isReliableFIDSupported())
return false;
for (Generalization di : info.getGeneralizations()) {
SimpleFeatureSource fs = getFeatureSourceFor(di);
if (!fs.getQueryCapabilities().isReliableFIDSupported())
return false;
}
return true;
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
@Override
public boolean supportsSorting(SortBy[] arg0) {
try {
if (!getBaseFeatureSource().getQueryCapabilities().supportsSorting(arg0))
return false;
for (Generalization di : info.getGeneralizations()) {
SimpleFeatureSource fs = getFeatureSourceFor(di);
if (!fs.getQueryCapabilities().supportsSorting(arg0))
return false;
}
return true;
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
};
return queryCapabilities;
}
/*
* (non-Javadoc)
*
* @see org.geotools.data.FeatureSource#getSchema() Schema derived from base feature schema 1)
* all generalized geom attributes removed 2) the default gemoetry propery is taken from
* the config
*/
public SimpleFeatureType getSchema() {
if (featureTyp != null)
return featureTyp;
try {
SimpleFeatureType baseType = getBaseFeatureSource().getSchema();
List<AttributeDescriptor> attrDescrs = new ArrayList<AttributeDescriptor>();
outer: for (AttributeDescriptor descr : baseType.getAttributeDescriptors()) {
for (Generalization di : info.getGeneralizations()) {
if (di.getDataSourceName().equals(info.getDataSourceName())) { // same
// datasource
if (di.getFeatureName().equals(baseType.getName().getLocalPart())) { // same
// feature
if (di.getGeomPropertyName().equals(descr.getName().getLocalPart())) // is
// gneralized
// geom
continue outer;
}
}
}
attrDescrs.add(descr);
}
GeometryDescriptor geomDescr = (GeometryDescriptor) baseType.getDescriptor(info
.getGeomPropertyName());
featureTyp = new SimpleFeatureTypeImpl(new NameImpl(
dataStore.getNamespace() == null ? null : dataStore.getNamespace().toString(),
info.getFeatureName()), attrDescrs, geomDescr, false, null, null, baseType
.getDescription());
} catch (IOException ex) {
throw new RuntimeException(ex);
}
return featureTyp;
}
/*
* (non-Javadoc)
*
* @see org.geotools.data.FeatureSource#getSupportedHints() Calculates the supported hints as
* intersection of the the generalized features and adds Hints.GEOMETRY_DISTANCE
*/
public Set<Key> getSupportedHints() {
if (supportedHints != null)
return supportedHints;
Set<Key> hints = new HashSet<Key>();
// calculate the supported hints, which is the intersection of supported Hints for all
// feature sources
try {
hints.addAll(getBaseFeatureSource().getSupportedHints()); // start with base feature
// source
for (Generalization di : info.getGeneralizations()) {
SimpleFeatureSource fs = getFeatureSourceFor(di);
hints.retainAll(fs.getSupportedHints());
}
} catch (IOException ex) {
throw new RuntimeException(ex);
}
;
hints.add(Hints.GEOMETRY_DISTANCE); // always supported
supportedHints = Collections.unmodifiableSet(hints);
return supportedHints;
}
public void removeFeatureListener(FeatureListener listener) {
listenerManager.removeFeatureListener(this, listener);
}
/**
* @param requestedDistance
* @return the proper feature source for the given distance
*/
private SimpleFeatureSource getFeatureSourceFor(
Double requestedDistance) throws IOException {
if (requestedDistance == null || requestedDistance == 0)
return getBaseFeatureSource();
Generalization di = info.getGeneralizationForDistance(requestedDistance);
return getFeatureSourceFor(di);
}
private SimpleFeatureSource getFeatureSourceFor(Generalization di)
throws IOException {
if (di == null)
return getBaseFeatureSource();
SimpleFeatureSource fs = featureSourceCache.get(di);
if (fs != null)
return fs;
DataStore ds = repository.dataStore(new NameImpl(di.getDataSourceNameSpace(), di
.getDataSourceName()));
if (ds == null)
dsNotFoundException(di.getDataSourceNameSpace(), di.getDataSourceName());
fs = ds.getFeatureSource(di.getFeatureName());
featureSourceCache.put(di, fs);
// calculate indexMapping
int[] mapping = calculateIndexMapping(fs.getSchema(), info.getGeomPropertyName(), di
.getGeomPropertyName());
indexMapping.put(di.getDistance(), mapping);
return fs;
}
private Double getRequestedDistance(Query query) {
Double result = (Double) query.getHints().get(Hints.GEOMETRY_DISTANCE);
if (result == null) {
log.warning("No hint for geometry distance in query, fallback to base feature" );
}
else {
log.info("Hint geometry distance: "+result);
}
return result;
}
private SimpleFeatureSource getFeatureSourceFor(Query query)
throws IOException {
Double distance = getRequestedDistance(query);
String geomPropertyName = info.getGeomPropertyName(); // the geometry for which we have
// generalizations
String[] queryProperyNames = query.getPropertyNames();
if (queryProperyNames != null) {
for (String prop : queryProperyNames) { // check if geom property name was specified in
// the query
if (prop.equals(geomPropertyName))
return getFeatureSourceFor(distance);
}
} else { // we have Query.ALL
return getFeatureSourceFor(distance);
}
// no geometry in the query for which generalizations are present.
return getBaseFeatureSource();
}
/**
* @param query
* the query object
* @param fs
* the backend feature surce
* @return Proxy modified for backend feature source
*
* create a proxy for the origianl query object 1) typeName has to be changed to backend type
* name 2) geometry property name has tob be changed to backend geometry property name
*
*/
private String getBackendGeometryName(SimpleFeatureSource fs) {
// look for the backend geom property name
for (Entry<Generalization, SimpleFeatureSource> entry : featureSourceCache
.entrySet()) {
if (entry.getValue() == fs) {
return entry.getKey().getGeomPropertyName();
}
}
return info.getGeomPropertyName(); // use prop name from base feature source
}
protected Query getProxyObject(Query query, SimpleFeatureSource fs) {
String baseGeomPropertyName = info.getGeomPropertyName(); // generalized geom property
String backendGeomPropertyName = getBackendGeometryName(fs);
String[] originalPropNames = query.getPropertyNames();
String[] newPropNames;
if (originalPropNames == Query.ALL_NAMES) {
newPropNames = new String[getSchema().getAttributeCount()];
for (int i = 0; i < newPropNames.length; i++) {
AttributeDescriptor attrDescr = getSchema().getAttributeDescriptors().get(i);
newPropNames[i] = attrDescr.getLocalName().equals(baseGeomPropertyName) ? backendGeomPropertyName
: attrDescr.getLocalName();
}
} else {
newPropNames = new String[originalPropNames.length];
for (int i = 0; i < newPropNames.length; i++) {
newPropNames[i] = originalPropNames[i].equals(baseGeomPropertyName) ? backendGeomPropertyName
: originalPropNames[i];
}
}
Query newQuery = new Query(query);
newQuery.setTypeName(fs.getName().getLocalPart());
newQuery.setPropertyNames(newPropNames);
return newQuery;
}
protected void logDistanceInfo(Generalization di) {
StringBuffer buff = new StringBuffer("Using generalizsation: ");
buff.append(di.getDataSourceName()).append(" ");
buff.append(di.getFeatureName()).append(" ");
buff.append(di.getGeomPropertyName()).append(" ");
buff.append(di.getDistance());
log.info(buff.toString());
}
}