/*
* 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.store;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.geotools.data.FeatureLocking;
import org.geotools.data.FeatureReader;
import org.geotools.data.FeatureWriter;
import org.geotools.data.FilteringFeatureWriter;
import org.geotools.data.InProcessLockingManager;
import org.geotools.data.LockingManager;
import org.geotools.data.Query;
import org.geotools.data.Transaction;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureStore;
import org.geotools.factory.Hints;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.NameImpl;
import org.geotools.filter.identity.FeatureIdImpl;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.Name;
import org.opengis.filter.Filter;
import org.opengis.filter.identity.FeatureId;
/**
* Abstract implementation of FeatureStore.
* <p>
* List its base class {@link ContentFeatureSource}, this feature store works off
* of operations provided by {@link FeatureCollection}.
* </p>
* <p>
* The {@link #addFeatures(SimpleFeatureCollection)} method is used to add features to
* the feature store. The method should return the "persistent" feature id's
* which are generated after the feature has been added to persistent storage.
* Often the persistent fid is different from the fid specified by the actual
* feature being inserted. For this reason {@link SimpleFeature#getUserData()} is
* used to report back persistent fids. It is up to the implementor of the
* feature collection to report this value back after a feature has been inserted.
* As an example, consider an implementation of {@link FeatureCollection#add(Object)}.
* <pre>
* boolean add( Object o ) {
* SimpleFeature feature = (SimpleFeature) o;
*
* //1.add the feature to storage
* ...
*
* //2. derive the persistent fid
* String fid = ...;
*
* //3. set the user data
* feature.getUserData().put( "fid", fid );
*
* }
* </pre>
* </p>
*
* @author Justin Deoliveira, The Open Planning Project
*
*
*
*
* @source $URL$
*/
public abstract class ContentFeatureStore extends ContentFeatureSource implements
SimpleFeatureStore,
FeatureLocking<SimpleFeatureType, SimpleFeature> {
/**
* writer flags
*/
protected final int WRITER_ADD = ContentDataStore.WRITER_ADD;
protected final int WRITER_UPDATE = ContentDataStore.WRITER_UPDATE;
/**
* Creates the content feature store.
*
* @param entry The entry for the feature store.
* @param query The defining query.
*/
public ContentFeatureStore(ContentEntry entry,Query query) {
super(entry,query);
}
/**
* Returns a writer over features specified by a filter.
*
* @param filter The filter
*/
public final FeatureWriter<SimpleFeatureType, SimpleFeature> getWriter( Filter filter ) throws IOException {
return getWriter( filter, WRITER_ADD | WRITER_UPDATE );
}
/**
* Returns a writer over features specified by a filter.
*
* @param filter The filter
* @param flags flags specifying writing mode
*/
public final FeatureWriter<SimpleFeatureType, SimpleFeature> getWriter( Filter filter, int flags ) throws IOException {
return getWriter( new Query( getSchema().getTypeName(), filter ), flags );
}
/**
* Returns a writer over features specified by a query.
*
* @param query The query
*/
public final FeatureWriter<SimpleFeatureType, SimpleFeature> getWriter( Query query ) throws IOException {
return getWriter( query, WRITER_ADD | WRITER_UPDATE );
}
/**
* Returns a writer over features specified by a query.
*
* @param query The query
* @param flags flags specifying writing mode
*/
public final FeatureWriter<SimpleFeatureType, SimpleFeature> getWriter( Query query, int flags ) throws IOException {
query = joinQuery( query );
query = resolvePropertyNames(query);
FeatureWriter<SimpleFeatureType, SimpleFeature> writer;
if (!canTransact() && transaction != null && transaction != Transaction.AUTO_COMMIT) {
DiffTransactionState state = (DiffTransactionState) getTransaction().getState(getEntry());
FeatureReader<SimpleFeatureType, SimpleFeature> reader = getReader(query);
writer = new DiffContentFeatureWriter(this, state.getDiff(), reader);
} else {
writer = getWriterInternal(query, flags);
// events
if (!canEvent()){
writer = new EventContentFeatureWriter(this, writer );
}
// filtering
if (!canFilter()) {
if (query.getFilter() != null && query.getFilter() != Filter.INCLUDE) {
writer = new FilteringFeatureWriter(writer, query.getFilter());
}
}
// Use InProcessLockingManager to assert write locks?
if (!canLock()) {
LockingManager lockingManager = getDataStore().getLockingManager();
writer = ((InProcessLockingManager) lockingManager).checkedWriter(writer,
transaction);
}
}
// Finished
return writer;
}
/**
*
* Subclass method for returning a native writer from the datastore.
* <p>
* It is important to note that if the native writer intends to handle any
* of the following natively:
* <ul>
* <li>reprojection</li>
* <li>filtering</li>
* <li>max feature limiting</li>
* <li>sorting</li>
* <li>locking</li>
* </ul>
* Then it <b>*must*</b> set the corresponding flags to <code>true</code>:
* <ul>
* <li>{@link #canReproject()}</li>
* <li>{@link #canFilter()}</li>
* <li>{@link #canLimit()}</li>
* <li>{@link #canSort()}</li>
* <li>{@link #canLock()}</li>
* </ul>
* </p>
* @param query Query
* @param flags See {@link #WRITER_ADD} and {@link #WRITER_UPDATE}
*/
protected abstract FeatureWriter<SimpleFeatureType, SimpleFeature> getWriterInternal( Query query, int flags )
throws IOException;
/**
* Adds a collection of features to the store.
* <p>
* This method operates by getting an appending feature writer and writing
* all the features in <tt>collection</tt> to it. Directly after a feature
* is written its id is obtained and added to the returned set.
* </p>
*/
public List<FeatureId> addFeatures(Collection collection)
throws IOException {
// gather up id's
List<FeatureId> ids = new LinkedList<FeatureId>();
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = getWriterAppend();
try {
for ( Iterator f = collection.iterator(); f.hasNext(); ) {
FeatureId id = addFeature((SimpleFeature) f.next(), writer);
ids.add( id );
}
} finally {
writer.close();
}
return ids;
}
/**
* Adds a collection of features to the store.
* <p>
* This method calls through to {@link #addFeatures(Collection)}.
* </p>
* @param featureCollection
*/
public List<FeatureId> addFeatures(FeatureCollection<SimpleFeatureType,SimpleFeature> featureCollection)
throws IOException {
// gather up id's
List<FeatureId> ids = new LinkedList<FeatureId>();
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = getWriterAppend();
FeatureIterator<SimpleFeature> f = featureCollection.features();
try {
while (f.hasNext()) {
SimpleFeature feature = (SimpleFeature) f.next();
FeatureId id = addFeature(feature, writer);
ids.add( id );
}
} finally {
writer.close();
f.close();
}
return ids;
}
/**
* Utility method that ensures we are going to write only in append mode
* @return
* @throws IOException
*/
private FeatureWriter<SimpleFeatureType, SimpleFeature> getWriterAppend() throws IOException {
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = getWriter( Filter.INCLUDE, WRITER_ADD );
while(writer.hasNext()) {
writer.next();
}
return writer;
}
FeatureId addFeature(SimpleFeature feature, FeatureWriter<SimpleFeatureType, SimpleFeature> writer) throws IOException {
// grab next feature and populate it
// JD: worth a note on how we do this... we take a "pull" approach
// because the raw schema we are inserting into may not match the
// schema of the features we are inserting
SimpleFeature toWrite = writer.next();
for ( int i = 0; i < toWrite.getType().getAttributeCount(); i++ ) {
String name = toWrite.getType().getDescriptor(i).getLocalName();
toWrite.setAttribute( name, feature.getAttribute(name));
}
// copy over the user data
if(feature.getUserData().size() > 0) {
toWrite.getUserData().putAll(feature.getUserData());
}
// pass through the fid if the user asked so
boolean useExisting = Boolean.TRUE.equals(feature.getUserData().get(Hints.USE_PROVIDED_FID));
if(getQueryCapabilities().isUseProvidedFIDSupported() && useExisting) {
((FeatureIdImpl) toWrite.getIdentifier()).setID(feature.getID());
}
//perform the write
writer.write();
// copy any metadata from the feature that was actually written
feature.getUserData().putAll( toWrite.getUserData() );
// add the id to the set of inserted
FeatureId id = toWrite.getIdentifier();
return id;
}
/**
* Sets the feature of the source.
* <p>
* This method operates by first clearing the contents of the feature
* store ({@link #removeFeatures(Filter)}), and then obtaining an appending
* feature writer and writing all features from <tt>reader</tt> to it.
* </p>
*/
public final void setFeatures(FeatureReader <SimpleFeatureType, SimpleFeature> reader) throws IOException {
//remove features
removeFeatures( Filter.INCLUDE );
//grab a feature writer for insert
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = getWriter( Filter.INCLUDE, WRITER_ADD );
try {
while( reader.hasNext() ) {
SimpleFeature feature = reader.next();
// grab next feature and populate it
// JD: worth a note on how we do this... we take a "pull" approach
// because the raw schema we are inserting into may not match the
// schema of the features we are inserting
SimpleFeature toWrite = writer.next();
for ( int i = 0; i < toWrite.getType().getAttributeCount(); i++ ) {
String name = toWrite.getType().getDescriptor(i).getLocalName();
toWrite.setAttribute( name, feature.getAttribute(name));
}
//perform the write
writer.write();
}
}
finally {
writer.close();
}
}
public void modifyFeatures(AttributeDescriptor[] type, Object[] value, Filter filter)
throws IOException {
Name attributeNames[] = new Name[ type.length ];
for( int i=0; i < type.length; i ++){
attributeNames[i] = type[i].getName();
}
modifyFeatures( attributeNames, value, filter );
}
/**
* Modifies/updates the features of the store which match the specified filter.
* <p>
* This method operates by obtaining an updating feature writer based on the
* specified <tt>filter</tt> and writing the updated values to it.
* </p>
* <p>
* The <tt>filter</tt> must not be <code>null</code>, in this case this method
* will throw an {@link IllegalArgumentException}.
* </p>
*/
public void modifyFeatures(Name[] type, Object[] value, Filter filter)
throws IOException {
if ( filter == null ) {
String msg = "Must specify a filter, must not be null.";
throw new IllegalArgumentException( msg );
}
filter = resolvePropertyNames(filter);
//grab a feature writer
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = getWriter( filter, WRITER_UPDATE );
try {
while( writer.hasNext() ) {
SimpleFeature toWrite = writer.next();
for ( int i = 0; i < type.length; i++ ) {
toWrite.setAttribute( type[i], value[i] );
}
writer.write();
}
}
finally {
writer.close();
}
}
final public void modifyFeatures(String name, Object attributeValue, Filter filter)
throws IOException {
modifyFeatures(new Name[] { new NameImpl(name), }, new Object[] { attributeValue, }, filter);
}
final public void modifyFeatures(String[] names, Object[] values, Filter filter) throws IOException {
Name attributeNames[] = new Name[names.length];
for (int i = 0; i < names.length; i++) {
attributeNames[i] = new NameImpl(names[i]);
}
modifyFeatures(attributeNames, values, filter);
}
/**
* Calls through to {@link #modifyFeatures(Name[], Object[], Filter)}.
*/
public final void modifyFeatures(AttributeDescriptor type, Object value, Filter filter)
throws IOException {
modifyFeatures( new Name[]{ type.getName() }, new Object[]{ value }, filter );
}
/**
* Calls through to {@link #modifyFeatures(Name[], Object[], Filter)}.
*/
public final void modifyFeatures(Name name, Object value, Filter filter)
throws IOException {
modifyFeatures( new Name[]{ name }, new Object[]{ value }, filter );
}
/**
* Removes the features from the store which match the specified filter.
* <p>
* This method operates by obtaining an updating feature writer based on
* the specified <tt>filter</tt> and removing every feature from it.
* </p>
* <p>
* The <tt>filter</tt> must not be <code>null</code>, in this case this method
* will throw an {@link IllegalArgumentException}.
* </p>
*/
public void removeFeatures(Filter filter) throws IOException {
if ( filter == null ) {
String msg = "Must specify a filter, must not be null.";
throw new IllegalArgumentException( msg );
}
filter = resolvePropertyNames(filter);
//grab a feature writer
FeatureWriter<SimpleFeatureType, SimpleFeature> writer = getWriter( filter, WRITER_UPDATE );
try {
//remove everything
while( writer.hasNext() ) {
writer.next();
writer.remove();
}
}
finally {
writer.close();
}
}
}