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/* gvSIG. Geographic Information System of the Valencian Government

 *

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

 * of the Valencian Gobernment (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 {DiSiD Technologies}  {Create Parameter object to define queries}

 */

package org.gvsig.fmap.dal;

import java.util.HashMap;

import java.util.Map;

import org.gvsig.tools.persistence.AbstractPersistenceManager;

import org.gvsig.tools.persistence.PersistenceException;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

/**

 * Defines the properties of a collection of data, as a result of a query

 * through a DataStore.

 * <p>

 * The scala parameter can be used by the DataStore as a hint about the quality

 * or resolution of the data needed to view or operate with the data returned.

 * As an example, it may use the scala to return only a representative subset of

 * the data, or maybe to return Data with less detail, like a point or a line

 * instead of a polygon.

 * </p>

 *

 * @author <a href="mailto:cordin@disid.com">C?sar Ordi?ana</a>

 */

public class DataQuery implements Persistent {

    private double scale;

    private Map attributes = new HashMap();

    /**

     * Empty constructor.

     */

    public DataQuery() {

        super();

    }

    /**

     * Constructor with an scale.

     *

     * @param scale

     *            the scale for the data

     */

    public DataQuery(double scale) {

        super();

        this.scale = scale;

    }

    /**

     * Returns the scale.

     *

     * @return the scale

     */

    public double getScale() {

        return scale;

    }

    /**

     * Sets the scale.

     *

     * @param scale

     *            the scale to set

     */

    public void setScale(double scale) {

        this.scale = scale;

    }

    /**

     * Returns the value of an attribute.

     *

     * @param name

     *            of the attribute

     * @return the attribute value

     */

    public Object getAttribute(String name) {

        return attributes.get(name);

    }

    /**

     * Sets the value of an attribute.

     *

     * @param name

     *            of the attribute

     * @param value

     *            for the attribute

     */

    public void setAttribute(String name, Object value) {

        attributes.put(name, value);

    }

        public PersistentState getState() throws PersistenceException {

                return AbstractPersistenceManager.getState(this);

        }

        public void loadState(PersistentState state) throws PersistenceException {

                // FIXME: falta por terminar de implementar

                state.set("scale", scale);

        }

        public void setState(PersistentState state) throws PersistenceException {

                // FIXME: falta por terminar de implementar

                this.scale = state.getDouble("scale");

        }

}