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):

* 2009 IVER T.I   {{Task}}

*/

package org.gvsig.fmap.dal.store.jdbc;

import java.util.NoSuchElementException;

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

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

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

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

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

import org.gvsig.tools.exception.BaseException;

/**

 * @author jmvivo

 *

 */

public class JDBCIterator extends AbstractFeatureProviderIterator {

        protected int resultSetID;

        protected Boolean hasNext = null;

        protected FeatureType featureType;

        protected JDBCSetProvider set;

        protected JDBCIterator(JDBCStoreProvider store, JDBCSetProvider set,

                        FeatureType featureType,

                        int resulsetID) throws DataException {

                super(store);

                this.resultSetID = resulsetID;

                this.featureType = featureType;

                this.set = set;

                this.hasNext = null;

                if (this.set != null && resulsetID >= 0){

                this.set.addResulsetReference(resulsetID);

                }

        }

        private JDBCStoreProvider getJDBCStoreProvider() {

                return (JDBCStoreProvider) getFeatureStoreProvider();

        }

    public final Object next() {

        try {

            getDataStoreProvider().open();

        } catch (OpenException e) {

            throw new RuntimeException(e);

        }

        return internalNext();

    }

    public final boolean hasNext() {

        return internalHasNext();

    }

        @Override

        protected boolean internalHasNext() {

                if (hasNext == null) {

                        try {

                                if (getJDBCStoreProvider().resulsetNext(resultSetID)) {

                                        hasNext = Boolean.TRUE;

                                } else {

                                        hasNext = Boolean.FALSE;

                                        this.close();

                                }

                        } catch (DataException e) {

                                // FIXME Exception

                                throw new RuntimeException(e);

                        }

                }

                return hasNext.booleanValue();

        }

        @Override

        protected Object internalNext() {

                if (!hasNext()) {

                        throw new NoSuchElementException();

                }

                FeatureProvider data;

                try {

                        data = getFeatureProvider();

                } catch (DataException e) {

                        // FIXME Exception

                        throw new RuntimeException(e);

                }

                hasNext = null;

                return data;

        }

        public void remove() {

                throw new UnsupportedOperationException();

        }

        protected FeatureProvider createFeatureProvider() throws DataException {

                return getFeatureStoreProvider().createFeatureProvider(featureType);

        }

        protected FeatureProvider getFeatureProvider() throws DataException {

                FeatureProvider data = createFeatureProvider();

                getJDBCStoreProvider().loadFeatureProvider(data, resultSetID);

                return data;

        }

        @Override

        protected void doDispose() throws BaseException {

                if (resultSetID >= 0){

                        this.close();

                }

                this.featureType = null;

        }

        protected void close() {

                try {

                        this.set.removeResulsetReference(resultSetID);

                        getJDBCStoreProvider().closeResulset(resultSetID);

                        resultSetID = -1;

                } catch (DataException e) {

                        throw new RuntimeException(e);

                }

        }

}