Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

*

* 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 2

* 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.

*

*/

/*

* AUTHORS (In addition to CIT):

* 2008 {{Company}}   {{Task}}

*/

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.DataStore;

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

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

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

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.FeatureType;

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.exception.BaseException;

import org.gvsig.tools.visitor.Visitor;

public class IndexFeatureSet implements FeatureSet, FeatureSetProvider {

        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, oid);

                        try {

                                return store.getFeatureByReference(ref);

                        } catch (DataException e) {

                                throw new ReadRuntimeException(store.getName(), 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

                                        .createFeatureData(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, oid);

                                FeatureProvider data = storeProvider

                                                .getFeatureDataByReference((FeatureReferenceProviderServices) ref);

                                feature.setData(data);

                                return feature;

                        } catch (DataException e) {

                                throw new ReadRuntimeException(store.getName(), 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.getFeatureStore();

                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 {

                if (store.isEditing()) {

                        return this.iterator(index);

                }

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

        }

        public DisposableIterator fastIterator() throws DataException {

                if (store.isEditing()) {

                        return this.iterator();

                }

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

        }

        public long getSize() throws DataException {

                return featureReferences.getSize();

        }

        public boolean isEmpty() throws DataException {

                return featureReferences.isEmpty();

        }

        public DisposableIterator iterator() throws DataException {

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

        }

        public DisposableIterator iterator(long index) throws DataException {

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

        }

        public void delete(Feature feature) throws DataException {

                index.delete(feature);

                store.delete(feature);

        }

        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.insert(feature);

        }

        public void update(EditableFeature feature) throws DataException {

                store.update(feature);

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

                index.delete(feature);

                index.insert(feature);

        }

        public void dispose() {

        }

        public boolean isFromStore(DataStore store) {

                return this.store.equals(store);

        }

        public void accept(Visitor visitor) throws BaseException {

                DisposableIterator iterator = iterator();

                while (iterator.hasNext()) {

                        Feature feature = (Feature) iterator.next();

                        visitor.visit(feature);

                }

                iterator.dispose();

        }

}