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.impl;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

import org.gvsig.fmap.dal.DataStoreNotification;

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

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

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

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

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

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

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

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

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

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

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

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

import org.gvsig.fmap.dal.feature.impl.DefaultFeatureReferenceSelection.SelectionData;

import org.gvsig.fmap.dal.feature.impl.featureset.AbstractFeatureSet;

import org.gvsig.fmap.dal.feature.impl.featureset.DefaultFeatureSet;

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

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dispose.DisposableIterator;

import org.gvsig.tools.dispose.DisposeUtils;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.exception.BaseException;

import org.gvsig.tools.observer.Observable;

import org.gvsig.tools.observer.Observer;

import org.gvsig.tools.persistence.PersistenceManager;

import org.gvsig.tools.persistence.PersistentState;

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

import org.gvsig.tools.visitor.Visitor;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * Default implementation of the FeatureSelection interface. Internally, only

 * FeatureReference values are stored.

 *

 * This implementation performs better if used with the selection related

 * methods: select, deselect and isSelected ones.

 *

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

 */

public class DefaultFeatureSelection extends AbstractFeatureSet

        implements FeatureSelection {

    public class RemoveFromFeatureSelectionException extends DataRuntimeException {

        /**

         *

         */

        private static final long serialVersionUID = 2636692469445838928L;

        private final static String MESSAGE_FORMAT = "Can't remove feature from reversed selection.";

        private final static String MESSAGE_KEY = "_RemoveFromFeatureSelectionException";

        public RemoveFromFeatureSelectionException(Throwable cause) {

            super(MESSAGE_FORMAT, cause, MESSAGE_KEY, serialVersionUID);

            //setValue("store", store);

        }

    }

    /**

     * Facade over a Iterator of FeatureReferences, to return Features instead.

     *

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

     */

    private class FeatureIteratorFacade implements DisposableIterator {

        private final Logger LOGGER = LoggerFactory

                .getLogger(FeatureIteratorFacade.class);

        private java.util.Iterator refIterator;

        private FeatureStore featureStore;

        private Feature currentFeature = null;

        public FeatureIteratorFacade(java.util.Iterator iter,

                FeatureStore featureStore) {

            this.refIterator = iter;

            this.featureStore = featureStore;

        }

        @Override

        public boolean hasNext() {

            return refIterator.hasNext();

        }

        @Override

        public Object next() {

            FeatureReference ref = nextFeatureReference();

            try {

                currentFeature = featureStore.getFeatureByReference(ref);

                return currentFeature;

            } catch (DataException ex) {

                LOGGER.error(

                        "Error loading the Feature with FeatureReference: "

                        + ref, ex);

                return null;

            }

        }

        /**

         * Returns the next FeatureReference.

         *

         * @return the next FeatureReference

         */

        public FeatureReference nextFeatureReference() {

            return (FeatureReference) refIterator.next();

        }

        @Override

        public void remove() {

            try {

                featureStore.delete(currentFeature);

                refIterator.remove();

            } catch (DataException e) {

                throw new RemoveFromFeatureSelectionException(e);

            }

        }

        public class RemoveFromFeatureSelectionException extends DataRuntimeException {

            /**

             *

             */

            private static final long serialVersionUID = 2636692469445838928L;

            private final static String MESSAGE_FORMAT = "Can't remove feature from selection.";

            private final static String MESSAGE_KEY = "_RemoveFromFeatureSelectionException";

            public RemoveFromFeatureSelectionException(Throwable cause) {

                super(MESSAGE_FORMAT, cause, MESSAGE_KEY, serialVersionUID);

                //setValue("store", store);

            }

        }

        @Override

        public void dispose() {

            if (refIterator instanceof DisposableIterator) {

                ((DisposableIterator) refIterator).dispose();

            }

            refIterator = null;

            featureStore = null;

        }

    }

    /**

     * Facade over a Iterator of FeatureReferences, to return Features instead,

     * when the Selection is reversed

     *

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

     */

    private class ReversedFeatureIteratorFacade implements DisposableIterator {

        private SelectionData selectionData;

        private DisposableIterator iterator;

        private Feature nextFeature = null;

        private Feature currentFeature = null;

        private FeatureSet featureSet;

        public ReversedFeatureIteratorFacade(SelectionData selectionData,

                FeatureStore featureStore, boolean fastIterator) {

            this.selectionData = selectionData;

            // Load a Set with all the store features

            try {

                featureSet = new IgnoreInsertAndUpdateFeatureSet(

                        (DefaultFeatureStore) featureStore, 

                        new DefaultFeatureQuery(featureStore.getDefaultFeatureType())

                );

                iterator = featureSet.fastIterator();

            } catch (DataException ex) {

                throw new ReversedSelectionIteratorException(ex);

            }

            // Filter the features not selected and position in the next

            // selected feature

            positionInNextElement();

        }

        @Override

        public boolean hasNext() {

            return nextFeature != null;

        }

        @Override

        public Object next() {

            featureIterators.remove(currentFeature);

            currentFeature = nextFeature.getCopy();

            featureIterators.put(currentFeature, this);

            positionInNextElement();

            return currentFeature;

        }

        @Override

        public void remove() {

            try {

                featureSet.delete(currentFeature);

            } catch (DataException e) {

                throw new RemoveFromFeatureSelectionException(e);

            }

        }

        private void positionInNextElement() {

            nextFeature = null;

            while (iterator.hasNext()) {

                nextFeature = (Feature) iterator.next();

                if (selectionData.contains(nextFeature.getReference())) {

                    nextFeature = null;

                } else {

                    break;

                }

            }

        }

        @Override

        public void dispose() {

            this.featureSet.dispose();

            this.iterator.dispose();

            this.selectionData = null;

            this.nextFeature = null;

        }

    }

    private Map featureTypeCounts = new HashMap(1);

    private final Map<Feature, Iterator> featureIterators = new HashMap<>();

    private final DefaultFeatureReferenceSelection featureReferenceSelection;

    private boolean disposed = false;

    /**

     * Creates a DefaultFeatureSelection, with a FeatureStore.

     *

     * @param featureStore the FeatureStore to load Features from

     * @throws DataException if there is an error while getting the total number

     * of Features of the Store.

     * @see AbstractSetBasedDataSelection#DefaultSelection(int)

     */

    public DefaultFeatureSelection(DefaultFeatureStore featureStore)

            throws DataException {

        DisposeUtils.bind(this);

        this.featureReferenceSelection = new DefaultFeatureReferenceSelection(featureStore);

    }

    /**

     * 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 DefaultFeatureSelection(FeatureStore featureStore,

            FeatureSelectionHelper helper) throws DataException {

        DisposeUtils.bind(this);

        this.featureReferenceSelection = new DefaultFeatureReferenceSelection(featureStore, helper);

    }

    /**

     * 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 DefaultFeatureSelection() {

        DisposeUtils.bind(this);

        this.featureReferenceSelection = new DefaultFeatureReferenceSelection();

    }

    @Override

    public FeatureStore getFeatureStore() {

        return this.featureReferenceSelection.getFeatureStore();

    }

    private void notifyObservers(String notificationType) {

        this.featureReferenceSelection.notifyObservers(notificationType);

    }

    public FeatureCommandsStack getCommands() {

        return this.featureReferenceSelection.getCommands();

    }

    @Override

    public void enableNotifications() {

        this.featureReferenceSelection.enableNotifications();

    }

    @Override

    public void disableNotifications() {

        this.featureReferenceSelection.disableNotifications();

    }

    public boolean isReversed() {

        return this.featureReferenceSelection.isReversed();

    }

    @Override

    public long getSelectedCount() {

        return this.featureReferenceSelection.getSelectedCount();

    }

    public DefaultFeatureReferenceSelection.SelectionData getData() {

        return this.featureReferenceSelection.getData();

    }

    @Override

    public boolean select(FeatureReference reference) {

        return this.featureReferenceSelection.select(reference);

    }

    public boolean select(FeatureReference reference, boolean undoable) {

        return this.featureReferenceSelection.select(reference, undoable);

    }

    @Override

    public boolean deselect(FeatureReference reference) {

        return this.featureReferenceSelection.deselect(reference);

    }

    public boolean deselect(FeatureReference reference, boolean undoable) {

        return this.featureReferenceSelection.deselect(reference, undoable);

    }

    @Override

    public Iterator<FeatureReference> referenceIterator() {

        return this.featureReferenceSelection.referenceIterator();

    }

    @Override

    public Iterable<FeatureReference> referenceIterable() {

        return this.featureReferenceSelection.referenceIterable();

    }

    @Override

    public void selectAll() throws DataException {

        this.featureReferenceSelection.selectAll();

    }

    @Override

    public void deselectAll() throws DataException {

        this.featureReferenceSelection.deselectAll();

    }

    public void deselectAll(boolean undoable) throws DataException {

        this.featureReferenceSelection.deselectAll(undoable);

    }

    @Override

    public boolean isSelected(FeatureReference reference) {

        return this.featureReferenceSelection.isSelected(reference);

    }

    @Override

    public void reverse() {

        this.featureReferenceSelection.reverse();

    }

    @Override

    public synchronized final void dispose() {

        // Check if we have already been disposed, and don't do it again

        if (!disposed) {

            if (DisposeUtils.release(this)) {

                try {

                    doDispose();

                } catch (Exception ex) {

                    LOG.error("Error performing dispose", ex);

                } finally {

                    disposed = true;

                }

            }

        }

    }

    @Override

    public void update(Observable o, Object o1) {

        this.featureReferenceSelection.update(o, o1);

    }

    @Override

    public void addObserver(Observer obsrvr) {

        this.featureReferenceSelection.addObserver(obsrvr);

    }

    @Override

    public void deleteObserver(Observer obsrvr) {

        this.featureReferenceSelection.deleteObserver(obsrvr);

    }

    @Override

    public void deleteObservers() {

        this.featureReferenceSelection.deleteObservers();

    }

    @Override

    public void beginComplexNotification() {

        this.featureReferenceSelection.beginComplexNotification();

    }

    @Override

    public void endComplexNotification() {

        this.featureReferenceSelection.endComplexNotification();

    }

    @Override

    public void saveToState(PersistentState ps) throws PersistenceException {

        this.featureReferenceSelection.saveToState(ps);

    }

    @Override

    public boolean select(Feature feature) {

        return select(feature, true);

    }

    /**

     * @param feature

     * @return

     * @see #select(Feature)

     * @param undoable if the action must be undoable

     */

    public boolean select(Feature feature, boolean undoable) {

        // TODO: should we check if the feature is from the same FeatureStore??

        if (feature == null) {

            return false;

        }

        // LOGGER.debug("Selected feature: {}", feature);

        if (isReversed()) {

            removeFeatureTypeCount(feature.getType());

        } else {

            addFeatureTypeCount(feature.getType());

        }

        return select(feature.getReference(), undoable);

    }

    @Override

    public boolean select(FeatureSet features) throws DataException {

        return select(features, true);

    }

    /**

     * @param features

     * @return

     * @throws org.gvsig.fmap.dal.exception.DataException

     * @see #select(FeatureSet)

     * @param undoable if the action must be undoable

     */

    public boolean select(FeatureSet features, boolean undoable)

            throws DataException {

        boolean change = false;

        boolean inComplex = false;

        if (undoable && this.featureReferenceSelection.getFeatureStore().isEditing()

                && !this.featureReferenceSelection.getCommands().inComplex()) {

            this.featureReferenceSelection.getCommands().startComplex("_selectionSelectFeatureSet");

            inComplex = this.featureReferenceSelection.getCommands().inComplex();

        }

        disableNotifications();

        DisposableIterator iter = null;

        try {

            for (iter = features.fastIterator(); iter.hasNext();) {

                change |= select((Feature) iter.next(), undoable);

            }

        } finally {

            DisposeUtils.disposeQuietly(iter);

        }

        enableNotifications();

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

            getCommands().endComplex();

        }

        if (change) {

            notifyObservers(DataStoreNotification.SELECTION_CHANGE);

        }

        return change;

    }

    @Override

    public boolean deselect(Feature feature) {

        return deselect(feature, true);

    }

    /**

     * @param feature

     * @return

     * @see #deselect(Feature)

     * @param undoable if the action must be undoable

     */

    public boolean deselect(Feature feature, boolean undoable) {

        if (feature == null) {

            return false;

        }

        LOG.debug("Deselected feature: {}", feature);

        if (isReversed()) {

            addFeatureTypeCount(feature.getType());

        } else {

            removeFeatureTypeCount(feature.getType());

        }

        return deselect(feature.getReference(), undoable);

    }

    @Override

    public boolean deselect(FeatureSet features) throws DataException {

        return deselect(features, true);

    }

    /**

     * @param features

     * @return

     * @throws org.gvsig.fmap.dal.exception.DataException

     * @see #deselect(FeatureSet)

     * @param undoable if the action must be undoable

     */

    public boolean deselect(FeatureSet features, boolean undoable)

            throws DataException {

        boolean change = false;

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

            getCommands().startComplex("_selectionDeselectFeatureSet");

        }

        disableNotifications();

        DisposableIterator iter = null;

        try {

            for (iter = features.fastIterator(); iter.hasNext();) {

                change |= deselect((Feature) iter.next(), undoable);

            }

        } finally {

            DisposeUtils.disposeQuietly(iter);

        }

        enableNotifications();

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

            getCommands().endComplex();

        }

        if (change) {

            notifyObservers(DataStoreNotification.SELECTION_CHANGE);

        }

        return change;

    }

    @Override

    public boolean isSelected(Feature feature) {

        if (feature == null) {

            return false;

        }

        if( this.featureReferenceSelection.isEmpty() ) {

            return false;

        }

        // Use the selection data size as a small optimization for the most

        // common case, when nothing is selected and every feature is checked

        // while drawing or painting the table document.

        if (getData().isReversed()) {

            return getData().getSize() == 0

                    || !getData().contains(feature.getReference());

        } else {

            return getData().getSize() > 0

                    && getData().contains(feature.getReference());

        }

    }

    @Override

    public FeatureType getDefaultFeatureType() {

        try {

            return getFeatureStore().getDefaultFeatureType();

        } catch (DataException ex) {

            LOG.error("Error getting the default feature type "

                    + "of the FeatureStore: " + getFeatureStore(), ex);

        }

        return null;

    }

    @Override

    public List getFeatureTypes() {

        // Go through the map of FeatureTypes, and return only the ones that

        // have at least a Feature.

        List types = new ArrayList();

        for (java.util.Iterator iterator = featureTypeCounts.entrySet()

                .iterator(); iterator.hasNext();) {

            Map.Entry entry = (Entry) iterator.next();

            FeatureType type = (FeatureType) entry.getKey();

            Long count = (Long) entry.getValue();

            if (count > 0) {

                types.add(type);

            }

        }

        return types;

    }

    @Override

    public long getSize() throws DataException {

        return getSelectedCount();

    }

    /**

     * Returns the list of selected values, or the deselected ones if the

     * selection has been reversed.

     *

     * WARN: not very good performance implementation.

     */

    @Override

        public DisposableIterator iterator(long index) {

                return iterator(index, 0, false);

        }

    @Override

        public DisposableIterator iterator(long index, long elements) {

                return iterator(index, elements, false);

        }

    /**

     * Returns the list of selected values, or the deselected ones if the

     * selection has been reversed.

     *

     * WARN: not really a fast implementation.

     */

    @Override

        public DisposableIterator fastIterator(long index) {

            return fastIterator(index, 0);

        }

    @Override

    public DisposableIterator fastIterator(long index, long elements) {

        return iterator(index, elements, true);

    }

    protected void clearFeatureReferences() {

        this.featureReferenceSelection.clearFeatureReferences();

        featureTypeCounts.clear();

    }

    /**

     * Creates an iterator for the Selection.

     */

    private DisposableIterator iterator(long index, long elements, boolean fastIterator) {

        if (isReversed()) {

            DisposableIterator iter = new ReversedFeatureIteratorFacade(

                    getData(), getFeatureStore(), fastIterator);

            for (long l = 0; l < index && iter.hasNext(); l++) {

                iter.next();

            }

            return iter;

        } else {

            // TODO: maybe we could add a new referenceIterator(int index)

            // method that could be implemented in a more performant way

            java.util.Iterator iter = getData().getSelected().iterator();

            for (long l = 0; l < index && iter.hasNext(); l++) {

                iter.next();

            }

            return new FeatureIteratorFacade(iter, getFeatureStore());

        }

    }

    private Long removeFeatureTypeCount(FeatureType featureType) {

        Long count = (Long) featureTypeCounts.get(featureType);

        if (count == null) {

            count = new Long(-1);

        } else {

            count = count - 1;

        }

        featureTypeCounts.put(featureType, count);

        return count;

    }

    private Long addFeatureTypeCount(FeatureType featureType) {

        Long count = (Long) featureTypeCounts.get(featureType);

        if (count == null) {

            count = new Long(1);

        } else {

            count = count + 1;

        }

        featureTypeCounts.put(featureType, count);

        return count;

    }

    @Override

    public void delete(Feature feature) throws DataException {

        Iterator it = this.featureIterators.get(feature);

        if (it != null) {

            it.remove();

            return;

        }

        feature.getStore().delete(feature);

    }

    @Override

    public void insert(EditableFeature feature) throws DataException {

        feature.getStore().insert(feature);

    }

    @Override

    public void update(EditableFeature feature) throws DataException {

        feature.getStore().update(feature);

    }

    @Override

    public void commitChanges() throws DataException {

    }

    /*

     * (non-Javadoc)

     *

     * @seeorg.gvsig.fmap.dal.feature.impl.DefaultFeatureReferenceSelection#

     * loadFromState(org.gvsig.tools.persistence.PersistentState)

     */

    @Override

    public void loadFromState(PersistentState state)

            throws PersistenceException {

        this.featureReferenceSelection.loadFromState(state);

    }

    protected void doDispose() throws BaseException {

        this.featureReferenceSelection.doDispose();

        featureTypeCounts.clear();

    }

    public static void registerPersistent() {

        PersistenceManager manager = ToolsLocator.getPersistenceManager();

        DynStruct definition = manager.addDefinition(

                DefaultFeatureSelection.class, "DefaultFeatureSelection",

                "DefaultFeatureSelection Persistent definition", null, null);

        definition.extend(manager.getDefinition(DefaultFeatureReferenceSelection.DYNCLASS_PERSISTENT_NAME));

        definition.addDynFieldMap("featureTypeCounts")

                .setClassOfItems(Long.class).setMandatory(false);

    }

    @Override

    public Object clone() throws CloneNotSupportedException {

        DefaultFeatureSelection clone = (DefaultFeatureSelection) super.clone();

        clone.featureTypeCounts = new HashMap(featureTypeCounts);

        return clone;

    }

    @Override

    protected void doAccept(Visitor visitor, long firstValueIndex, long elements) throws BaseException {

        if( this.featureReferenceSelection.isEmpty() ) {

            return;

        }

        DisposableIterator iterator = fastIterator(firstValueIndex, elements);

        if (iterator != null) {

            try {

                while (iterator.hasNext()) {

                    Feature feature = (Feature) iterator.next();

                    visitor.visit(feature);

                }

            } finally {

                iterator.dispose();

            }

        }

    }

    private static class IgnoreInsertAndUpdateFeatureSet extends DefaultFeatureSet {

        public IgnoreInsertAndUpdateFeatureSet(DefaultFeatureStore store, FeatureQuery query) throws DataException {

            super(store, query);

        }

        public void update(Observable obsevable, Object notification) {

            String type = ((FeatureStoreNotification) notification).getType();

            if (type.equalsIgnoreCase(FeatureStoreNotification.AFTER_INSERT)

                    || type.equalsIgnoreCase(FeatureStoreNotification.AFTER_UPDATE)) {

                return;

            }

            super.update(obsevable, notification);

        }

    }

    @Override

    public boolean isAvailable() {

        return this.featureReferenceSelection.isAvailable();

    }

}