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/* 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 {DiSiD Technologies}  {Implement data selection}

 */

package org.gvsig.fmap.dal.feature.impl;

import java.lang.ref.Reference;

import java.util.Collections;

import java.util.HashSet;

import java.util.Iterator;

import java.util.Set;

import org.gvsig.fmap.dal.DataStore;

import org.gvsig.fmap.dal.DataStoreNotification;

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

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

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

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

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

import org.gvsig.fmap.dal.feature.impl.undo.FeatureCommandsStack;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dispose.impl.AbstractDisposable;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.lang.Cloneable;

import org.gvsig.tools.observer.Observable;

import org.gvsig.tools.observer.Observer;

import org.gvsig.tools.observer.impl.BaseWeakReferencingObservable;

import org.gvsig.tools.observer.impl.DelegateWeakReferencingObservable;

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

import org.gvsig.tools.visitor.Visitor;

/**

 * Default implementation of a FeatureReferenceSelection, based on the usage of

 * a java.util.Set to store individual selected or not selected

 * FeatureReferences, depending on the usage of the {@link #reverse()} method.

 *

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

 */

public class DefaultFeatureReferenceSelection extends AbstractDisposable

                implements FeatureReferenceSelection {

        public static final String DYNCLASS_PERSISTENT_NAME =

                        "DefaultFeatureReferenceSelection";

    protected SelectionData selectionData = new SelectionData();

    private FeatureStore featureStore;

    private FeatureSelectionHelper helper;

        private DelegateWeakReferencingObservable delegateObservable =

                        new DelegateWeakReferencingObservable(this);

        /**

         * Creates a new Selection with the total size of Features from which the

         * selection will be performed.

         *

         * @param featureStore

         *            the FeatureStore of the selected FeatureReferences

         * @throws DataException

         *             if there is an error while getting the total number of

         *             Features of the Store.

         */

    public DefaultFeatureReferenceSelection(DefaultFeatureStore featureStore)

            throws DataException {

        super();

        this.featureStore = featureStore;

        this.helper = new DefaultFeatureSelectionHelper(featureStore);

        selectionData.setTotalSize(featureStore.getFeatureCount());

    }

    /**

     * Creates a new Selection with the total size of Features from which the

     * selection will be performed.

     *

     * @param featureStore

     *            the FeatureStore of the selected FeatureReferences

     * @param helper

     *            to get some information of the Store

     * @throws DataException

     *             if there is an error while getting the total number of

     *             Features of the Store.

     */

    public DefaultFeatureReferenceSelection(FeatureStore featureStore,

            FeatureSelectionHelper helper)

            throws DataException {

        super();

        this.featureStore = featureStore;

        this.helper = helper;

        selectionData.setTotalSize(featureStore.getFeatureCount());

    }

        /**

         * Constructor used by the persistence manager. Don't use directly. After to

         * invoke this method, the persistence manager calls the the method

         * {@link #loadFromState(PersistentState)} to set the values of the internal

         * attributes that this class needs to work.

         */

        public DefaultFeatureReferenceSelection() {

                super();

        }

    public boolean select(FeatureReference reference) {

        return select(reference, true);

    }

    /**

     * @see #select(FeatureReference)

     * @param undoable

     *            if the action must be undoable

     */

    public boolean select(FeatureReference reference, boolean undoable) {

        if (reference == null) {

            throw new IllegalArgumentException("reference");

        }

        if (isSelected(reference)) {

            return false;

        }

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().select(this, reference);

        }

        boolean change = false;

        if (selectionData.isReversed()) {

            change = selectionData.remove(reference);

        } else {

            change = selectionData.add(reference);

        }

        if (change) {

            notifyObservers(DataStoreNotification.SELECTION_CHANGE);

        }

        return change;

    }

    public boolean deselect(FeatureReference reference) {

        return deselect(reference, true);

    }

    /**

     * @see #deselect(FeatureReference)

     * @param undoable

     *            if the action must be undoable

     */

    public boolean deselect(FeatureReference reference, boolean undoable) {

        if (!isSelected(reference)) {

            return false;

        }

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().deselect(this, reference);

        }

        boolean change = false;

        if (selectionData.isReversed()) {

            change = selectionData.add(reference);

        } else {

            change = selectionData.remove(reference);

        }

        if (change) {

            notifyObservers(DataStoreNotification.SELECTION_CHANGE);

        }

        return change;

    }

    public void selectAll() throws DataException {

        selectAll(true);

    }

    /**

     * @see #selectAll()

     * @param undoable

     *            if the action must be undoable

     */

    public void selectAll(boolean undoable) throws DataException {

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().startComplex("_selectionSelectAll");

            getCommands().selectAll(this);

        }

        if (!selectionData.isReversed()) {

            selectionData.setReversed(true);

        }

        clearFeatureReferences();

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().endComplex();

        }

        notifyObservers(DataStoreNotification.SELECTION_CHANGE);

    }

    public void deselectAll() throws DataException {

        deselectAll(true);

    }

    /**

     * @see #deselectAll()

     * @param undoable

     *            if the action must be undoable

     */

    public void deselectAll(boolean undoable) throws DataException {

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().startComplex("_selectionDeselectAll");

            getCommands().deselectAll(this);

        }

        if (selectionData.isReversed()) {

            selectionData.setReversed(false);

        }

        clearFeatureReferences();

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().endComplex();

        }

        notifyObservers(DataStoreNotification.SELECTION_CHANGE);

    }

    public boolean isSelected(FeatureReference reference) {

        if (selectionData.isReversed()) {

            return !selectionData.contains(reference);

        } else {

            return selectionData.contains(reference);

        }

    }

    public void reverse() {

        reverse(true);

    }

    /**

     * @see #reverse()

     * @param undoable

     *            if the action must be undoable

     */

    public void reverse(boolean undoable) {

        if (undoable && getFeatureStore().isEditing()) {

            getCommands().selectionReverse(this);

        }

        selectionData.setReversed(!selectionData.isReversed());

        notifyObservers(DataStoreNotification.SELECTION_CHANGE);

    }

    public long getSelectedCount() {

        if (selectionData.isReversed()) {

                return selectionData.getTotalSize() - selectionData.getSize()

                        + helper.getFeatureStoreDeltaSize();

        } else {

            return selectionData.getSize();

        }

    }

    public Iterator referenceIterator() {

        return Collections.unmodifiableSet(selectionData.getSelected())

                .iterator();

    }

        protected void doDispose() throws BaseException {

                delegateObservable.deleteObservers();

                deselectAll(false);

    }

    public boolean isFromStore(DataStore store) {

        return featureStore.equals(store);

    }

    public void accept(Visitor visitor) throws BaseException {

        for (Iterator iter = selectionData.getSelected().iterator(); iter

                .hasNext();) {

            visitor.visit(iter.next());

        }

    }

    public void update(Observable observable,

                        Object notification) {

        // If a Feature is deleted, remove it from the selection Set.

        if (notification instanceof FeatureStoreNotification) {

            FeatureStoreNotification storeNotif = (FeatureStoreNotification) notification;

            if (FeatureStoreNotification.AFTER_DELETE

                    .equalsIgnoreCase(storeNotif.getType())) {

                selectionData.remove(storeNotif.getFeature().getReference());

            }

        }

    }

    public SelectionData getData() {

        return selectionData;

    }

    public void setData(SelectionData selectionData) {

        this.selectionData = selectionData;

        notifyObservers(DataStoreNotification.SELECTION_CHANGE);

    }

    public String toString() {

        return getClass().getName() + ": " + getSelectedCount()

                + " features selected, reversed = "

                + selectionData.isReversed() + ", featureIds contained: "

                + selectionData.getSelected();

    }

    protected boolean isReversed() {

        return selectionData.isReversed();

    }

    /**

     * Removes all the stored FeatureRefence objects.

     */

    protected void clearFeatureReferences() {

        selectionData.clear();

    }

        /**

         * Returns the FeatureStore of the selected FeatureReferences.

         *

         * @return the featureStore

         */

    protected FeatureStore getFeatureStore() {

        return featureStore;

    }

        /**

         * Returns the reference to the commands record.

         *

         * @return the reference to the commands record

         */

    protected FeatureCommandsStack getCommands() {

        return helper.getFeatureStoreCommandsStack();

    }

        public static class SelectionData implements Cloneable {

        private Set selected = new HashSet();

        /**

         * Sets how the Set of selected values has to be dealt.

         * <p>

         * If selected is FALSE, then values into the Set are the selected ones,

         * anything else is not selected.

         * </p>

         * <p>

         * If selected is TRUE, then values into the Set are values not

         * selected, anything else is selected.

         * </p>

         */

        private boolean reversed = false;

        private long totalSize;

        /**

         * @return the selected

         */

        public Set getSelected() {

            return selected;

        }

        /**

         * @param selected

         *            the selected to set

         */

        public void setSelected(Set selected) {

            this.selected = selected;

        }

        /**

         * @return the reversed

         */

        public boolean isReversed() {

            return reversed;

        }

        /**

         * @param reversed

         *            the reversed to set

         */

        public void setReversed(boolean reversed) {

            this.reversed = reversed;

        }

        /**

         * @return the totalSize

         */

        public long getTotalSize() {

            return totalSize;

        }

        /**

         * @param totalSize

         *            the totalSize to set

         */

        public void setTotalSize(long totalSize) {

            this.totalSize = totalSize;

        }

        public boolean add(FeatureReference reference) {

            return selected.add(reference);

        }

        public boolean remove(FeatureReference reference) {

            return selected.remove(reference);

        }

        public void clear() {

            selected.clear();

        }

        public boolean contains(FeatureReference reference) {

            return selected.contains(reference);

        }

        public int getSize() {

            return selected.size();

        }

        public Object clone() throws CloneNotSupportedException {

                        SelectionData clone = (SelectionData) super.clone();

                        // reversed and totalSize already cloned by parent.

                        // clone the selected Set

                        clone.selected = new HashSet(selected);

            return clone;

        }

    }

    // *** Persistence ***

        public void saveToState(PersistentState state) throws PersistenceException {

                state.set("store", featureStore);

                state.set("reversed", selectionData.isReversed());

                state.set("totalSize", selectionData.getTotalSize());

                state.set("selected", selectionData.getSelected().iterator());

        }

        public void loadFromState(PersistentState state)

                        throws PersistenceException {

                featureStore = (FeatureStore)state.get("store");

                helper = new DefaultFeatureSelectionHelper((DefaultFeatureStore)featureStore);

                selectionData.setReversed(state.getBoolean("reversed"));

                selectionData.setTotalSize(state.getLong("totalSize"));

                Iterator it = state.getIterator("selected");

                while (it.hasNext()) {

                        DefaultFeatureReference ref = (DefaultFeatureReference) it.next();

                        selectionData.add(ref);

                }

        }

        public static void registerPersistent() {

                DynStruct definition = ToolsLocator.getPersistenceManager().addDefinition(

                                DefaultFeatureReferenceSelection.class,

                                DYNCLASS_PERSISTENT_NAME,

                                "DefaultFeatureReferenceSelection Persistent definition",

                                null,

                                null

                        );

                definition.addDynFieldObject("store").setClassOfValue(FeatureStore.class).setMandatory(true);

                definition.addDynFieldBoolean("reversed").setMandatory(true);

                definition.addDynFieldLong("totalSize").setMandatory(true);

                definition.addDynFieldList("selected").setClassOfItems(DefaultFeatureReference.class).setMandatory(true);

        }

        public void addObserver(Observer observer) {

                delegateObservable.addObserver(observer);

        }

        public void addObserver(Reference ref) {

                delegateObservable.addObserver(ref);

        }

        public void addObservers(BaseWeakReferencingObservable observable) {

                delegateObservable.addObservers(observable);

        }

        public void beginComplexNotification() {

                delegateObservable.beginComplexNotification();

        }

        public int countObservers() {

                return delegateObservable.countObservers();

        }

        public void deleteObserver(Observer observer) {

                delegateObservable.deleteObserver(observer);

        }

        public void deleteObserver(Reference ref) {

                delegateObservable.deleteObserver(ref);

        }

        public void deleteObservers() {

                delegateObservable.deleteObservers();

        }

        public void disableNotifications() {

                delegateObservable.disableNotifications();

        }

        public void enableNotifications() {

                delegateObservable.enableNotifications();

        }

        public void endComplexNotification() {

                // We don't want to notify many times in a complex notification

                // scenario, so ignore notifications if in complex.

                // Only one notification will be sent when the complex notification

                // ends.

                delegateObservable

                                .notifyObservers(DataStoreNotification.SELECTION_CHANGE);

                delegateObservable.endComplexNotification();

        }

        public boolean inComplex() {

                return delegateObservable.inComplex();

        }

        public boolean isEnabledNotifications() {

                return delegateObservable.isEnabledNotifications();

        }

        public void notifyObservers() {

                // We don't want to notify many times in a complex notification

                // scenario, so ignore notifications if in complex.

                // Only one notification will be sent when the complex notification

                // ends.

                if (!delegateObservable.inComplex()) {

                        delegateObservable.notifyObservers();

                }

        }

        public void notifyObservers(Object arg) {

                if (!delegateObservable.inComplex()) {

                        delegateObservable.notifyObservers(arg);

                }

        }

        public Object clone() throws CloneNotSupportedException {

                DefaultFeatureReferenceSelection clone = (DefaultFeatureReferenceSelection) super

                                .clone();

                // Original observers aren't cloned

                clone.delegateObservable = new DelegateWeakReferencingObservable(clone);

                // Clone internal data

                clone.selectionData = (SelectionData) selectionData.clone();

                // featureStore and helper are already swallow cloned by our parent

                return clone;

        }

}