Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.dal.feature.impl;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.exception.ReadRuntimeException;

import org.gvsig.fmap.dal.feature.EditableFeature;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureReference;

import org.gvsig.fmap.dal.feature.FeatureSet;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.impl.featureset.AbstractFeatureSet;

import org.gvsig.fmap.dal.feature.spi.FeatureProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureReferenceProviderServices;

import org.gvsig.fmap.dal.feature.spi.FeatureSetProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureStoreProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureStoreProviderServices;

import org.gvsig.fmap.dal.feature.spi.LongList;

import org.gvsig.fmap.dal.feature.spi.index.FeatureIndexProviderServices;

import org.gvsig.tools.dispose.DisposableIterator;

public class IndexFeatureSet

    extends AbstractFeatureSet

    implements FeatureSet, FeatureSetProvider, Iterable<Feature> {

        LongList featureReferences = null;

        FeatureStoreProvider storeProvider = null;

        FeatureStoreProviderServices store = null;

        FeatureIndexProviderServices index = null;

        List featureTypes = null;

        public class IndexIterator implements DisposableIterator {

                Iterator it = null;

                public IndexIterator(Iterator it) {

                        this.it = it;

                }

                public boolean hasNext() {

                        return it.hasNext();

                }

                public Object next() {

                        Object oid = it.next();

                        FeatureReference ref = new DefaultFeatureReference(store

                                        .getFeatureStore(), oid);

                        try {

                                return store.getFeatureStore().getFeatureByReference(ref);

                        } catch (DataException e) {

                                throw new ReadRuntimeException(store.getName(),oid, e);

                        }

                }

                public void remove() {

                        throw new UnsupportedOperationException();

                }

                public void dispose() {

                        this.it = null;

                }

        }

        public class FastIndexIterator implements DisposableIterator {

                Iterator it = null;

                DefaultFeature feature = null;

                public FastIndexIterator(Iterator it) throws DataException {

                        this.it = it;

                        feature = (DefaultFeature) store.createFeature(storeProvider

                                        .createFeatureProvider(index.getFeatureType()));

                }

                public boolean hasNext() {

                        return it.hasNext();

                }

                public Object next() {

                        Object oid = it.next();

                        try {

                                //                                Long longer=new Long(((Integer)oid).longValue());

                                FeatureReference ref = new DefaultFeatureReference(store

                                                .getFeatureStore(), oid);

                                FeatureProvider data = storeProvider

                                                .getFeatureProviderByReference((FeatureReferenceProviderServices) ref);

                                feature.setData(data);

                                return feature;

                        } catch (DataException e) {

                                throw new ReadRuntimeException(store.getName(),oid, e);

                        }

                }

                public void remove() {

                        throw new UnsupportedOperationException();

                }

                public void dispose() {

                        this.it = null;

                        this.feature = null;

                }

        }

        public IndexFeatureSet(FeatureIndexProviderServices index, LongList featureReferences) {

                this.featureReferences = featureReferences;

                this.store = index.getFeatureStoreProviderServices();

                this.storeProvider = store.getProvider();

                this.index = index;

        }

        public boolean canFilter() {

                return false;

        }

        public boolean canIterateFromIndex() {

                return true;

        }

        public boolean canOrder() {

                return false;

        }

    public DisposableIterator fastIterator(long index) throws DataException {

        return fastIterator(index, 0);

    }

    public DisposableIterator fastIterator(long index, long elements) throws DataException {

        if (store.getFeatureStore().isEditing()) {

            return this.iterator(index, elements);

        }

        return new FastIndexIterator(this.featureReferences.iterator(index));

    }

        public long getSize() throws DataException {

                return featureReferences.getSize();

        }

        public boolean isEmpty() throws DataException {

                return featureReferences.isEmpty();

        }

        public DisposableIterator iterator(long index) throws DataException {

                return new IndexIterator(this.featureReferences.iterator(index));

        }

        public DisposableIterator iterator(long index, long elements) throws DataException {

                return new IndexIterator(this.featureReferences.iterator(index));

        }

        public void delete(Feature feature) throws DataException {

                index.delete(feature);

                store.getFeatureStore().delete(feature);

        }

        @Override

        public void commitChanges() throws DataException {

            store.getFeatureStore().commitChanges();

        }

        public FeatureType getDefaultFeatureType() {

                return index.getFeatureType();

        }

        public List getFeatureTypes() {

                List types = new ArrayList();

                types.add(index.getFeatureType());

                return Collections.unmodifiableList(types);

        }

        public void insert(EditableFeature feature) throws DataException {

                index.insert(feature);

                store.getFeatureStore().insert(feature);

        }

        public void update(EditableFeature feature) throws DataException {

                store.getFeatureStore().update(feature);

                // we need to re-index the feature, since its shape might have changed

                index.delete(feature);

                index.insert(feature);

        }

        public void dispose() {

        }

    @Override

    public FeatureStore getFeatureStore() {

        return this.store.getFeatureStore();

    }

}