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.spi.memory;

import java.util.Iterator;

import java.util.List;

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

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

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

import org.gvsig.fmap.dal.feature.exception.IteratorIndexTooBigException;

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

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

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

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

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

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

import org.gvsig.tools.dispose.Disposable;

import org.gvsig.tools.exception.BaseException;

/**

 * Implementation of {@link FeatureSetProvider} used in

 * {@link AbstractMemoryStoreProvider}

 *

 */

public class MemoryFeatureSet extends AbstractFeatureSetProvider {

        protected List data;

        public MemoryFeatureSet(AbstractFeatureStoreProvider store,

                        FeatureQuery query, FeatureType featureType, List data) {

                super(store, query,

                /*

                 * Comprobar si los attributos solicitados son distintos a los

                 * originales.

                 */

                featureType.equals(store.getStoreServices()

                                .getProviderFeatureType(featureType.getId())) ? null

                                : featureType);

                this.data = data;

                /*

                 * Nota: Como no sabe filtrar ni ordenar ignora el query.

                 */

        }

        public boolean canFilter() {

                return false;

        }

        public boolean canOrder() {

                return false;

        }

        public boolean canIterateFromIndex() {

                return true;

        }

        public long getSize() throws DataException {

                return data.size();

        }

        public boolean isEmpty() throws DataException {

                return data.isEmpty();

        }

        protected void doDispose() throws BaseException {

                //data only has to be deleted when the store.dispose method is called

                //data.clear();

        }

        protected AbstractFeatureProviderIterator createFastIterator(long index)

                        throws DataException {

                return createIterator(index);

        }

        protected AbstractFeatureProviderIterator createIterator(long index)

                        throws DataException {

                if (index > 0 && index >= data.size()) {

                        throw new IteratorIndexTooBigException(index, data.size());

                }

                Iterator iter =

                                index <= 0 ? data.iterator() : data.listIterator((int) index);

                if (getProviderFeatureType() == null) {

                        return new DelegatedDisposableIterator(getStore(), iter);

                } else {

                        return new DelegatedDisposableWrappedIterator(getStore(), iter,

                                        getProviderFeatureType());

                }

        }

        protected class DelegatedDisposableIterator extends

                        AbstractFeatureProviderIterator {

                private Iterator delegated;

                public DelegatedDisposableIterator(FeatureStoreProvider store,

                                Iterator it) {

                        super(store);

                        this.delegated = it;

                }

                protected void internalDispose() {

                        this.delegated = null;

                }

                protected boolean internalHasNext() {

                        return delegated.hasNext();

                }

                protected Object internalNext() {

                        Object x = delegated.next(); 

                        return x;

                }

                public void remove() {

                        throw new UnsupportedOperationException();

                }

                protected void doDispose() throws BaseException {

                        if (delegated instanceof Disposable) {

                                ((Disposable) delegated).dispose();

                        }

                }

        }

        protected class DelegatedDisposableWrappedIterator extends

                        DelegatedDisposableIterator {

                private FeatureType fType;

                public DelegatedDisposableWrappedIterator(

                                FeatureStoreProvider store, Iterator it,

                                FeatureType featureType) {

                        super(store, it);

                        this.fType = featureType;

                }

                protected Object internalNext() {

                    FeatureProvider feature = (FeatureProvider) super.internalNext();

                    if (fType == null) {

                        return feature;

                    } else {

                        return new MemoryFeatureProviderAttributeMapper(

                                feature,

                                this.fType

                        );

                    }

                }

        }

}