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package org.gvsig.fmap.dal.feature;

import java.util.Iterator;

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

/**

 * This interface represents a container for store transforms.

 *

 * Provides access to transforms by index and by iterator, and also allows

 * adding and removing transforms.

 *

 */

public interface FeatureStoreTransforms {

        /**

         * Returns the FeatureStoreTransform given its index.

         *

         * @param index

         *                         a position in this FeatureStoreTransforms

         *

         * @return

         *                 the FeatureStoreTransform that is stored in the given index.

         */

        public FeatureStoreTransform getTransform(int index);

        /**

         * Adds a FeatureStoreTransform to this container.

         *

         * @param transform

         *                         the FeatureStoreTransform to add

         *

         * @return

         *                 the added FeatureStoreTransform

         *

         * @throws DataException

         */

        public FeatureStoreTransform add(FeatureStoreTransform transform)

                        throws DataException;

        /**

         * Returns the number of FeatureStoreTransforms stored in this container

         *

         * @return

         *                 number of FeatureStoreTransforms stored in this container

         */

        public int size();

        /**

         * Indicates whether this container is empty.

         *

         * @return

         *                 true if this container is empty, false if not

         */

        public boolean isEmpty();

        /**

         * Returns an iterator over this container elements.

         *

         * @return

         *                 an iterator over this container elements.

         */

        public Iterator iterator();

        /**

         * Empties this container.

         *

         */

        public void clear();

        /**

         * Removes the {@link FeatureStoreTransform} given its index.

         *

         * @param index

         *                         the position of the {@link FeatureStoreTransform} to remove.

         * @return

         *                 the removed object

         */

        public Object remove(int index);

        /**

         * Removes the given {@link FeatureStoreTransform}.

         *

         * @param transform

         *                                 {@link FeatureStoreTransform} to remove

         * @return

         *                 true if the transform was successfully removed, false if not.

         */

        public boolean remove(FeatureStoreTransform transform);

        /**

         * Retruns true if any {@link FeatureStoreTransform} make changes of any

         * previous attributes values.<br>

         *

         * If all {@link FeatureStoreTransform} affects only to attributes defition,

         * the {@link FeatureSet} performance can be better.

         *

         * @return

         */

        public boolean isTransformsOriginalValues();

}