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package org.gvsig.fmap.dal.feature;

import java.util.Iterator;

import java.util.List;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.dal.DataServerExplorer;

import org.gvsig.fmap.dal.DataServerExplorerParameters;

import org.gvsig.fmap.dal.DataStore;

import org.gvsig.fmap.dal.DataStoreParameters;

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

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

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

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

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.tools.dynobject.DynObject;

import org.gvsig.tools.observer.Observer;

import org.gvsig.tools.undo.UndoRedoStack;

/**

 * <p>

 * A FeatureStore is a type of store whose data consists on sets of

 * {@link Feature}(s). {@link Feature}(s) from the same FeatureStore can be of

 * different {@link FeatureType}(s) (as in GML format for instance).

 * </p>

 *

 * <p>

 * FeatureStore allows:

 * </p>

 * <ul>

 * <li>Obtaining the default {@link FeatureType}. A FeatureStore always has one

 * and only one default FeatureType.

 * <li>Obtaining the list of {@link FeatureType}(s) defined in the FeatureStore.

 * <li>Obtaining, filtering and sorting subsets of data ({@link FeatureSet})

 * through {@link FeatureQuery}, as well as background loading.

 * <li>Obtaining the total {@link Envelope} (AKA bounding box or extent) of the

 * store.

 * <li>Support for editing {@link FeatureType}(s).

 * <li>Obtaining information about contained {@link Geometry} types.

 * <li>Exporting to another store.

 * <li>Indexing.

 * <li>Selection.

 * <li>Locks management.

 * </ul>

 *

 */

public interface FeatureStore extends DataStore, UndoRedoStack {

        public static final String DYNCLASS_NAME = "FeatureStore";

        /** Indicates that this store is in query mode */

        final static int MODE_QUERY = 0;

        /** Indicates that this store is in full edit mode */

        final static int MODE_FULLEDIT = 1;

        /** Indicates that this store is in append mode */

        final static int MODE_APPEND = 2;

        /*

         * =============================================================

         *

         * information related services

         */

        /**

         * Indicates whether this store allows writing.

         *

         * @return

         *                 true if this store can be written, false if not.

         */

        public boolean allowWrite();

        /**

         * Returns this store's default {@link FeatureType}.

         *

         * @return

         *                 this store's default {@link FeatureType}.

         *

         * @throws DataException

         */

        public FeatureType getDefaultFeatureType() throws DataException;

        /**

         * Returns this store's featureType {@link FeatureType} matches with

         * featureTypeId.

         *

         * @param featureTypeId

         *

         * @return this store's default {@link FeatureType}.

         *

         * @throws DataException

         */

        public FeatureType getFeatureType(String featureTypeId)

                        throws DataException;

        /**

         * Returns this store's {@link FeatureType}(s).

         *

         * @return a list with this store's {@link FeatureType}(s).

         *

         * @throws DataException

         */

        public List getFeatureTypes() throws DataException;

        /**

         * Returns this store's parameters.

         *

         * @return

         *                 {@link DataStoreParameters} containing this store's parameters

         */

        public DataStoreParameters getParameters();

        /**

         *@throws DataException

         * @deprecated Mirar de cambiarlo a metadatos

         */

        public boolean canWriteGeometry(int gvSIGgeometryType) throws DataException;

        /**

         * Returns this store's total envelope (extent).

         * 

         * @return this store's total envelope (extent) or <code>null</code> if

         *         store not have geometry information

         */

        public Envelope getEnvelope() throws DataException;

        /**

         *

         * @deprecated use getDefaultFeatureType().getDefaultSRS()

         * @return

         * @throws DataException

         */

        public IProjection getSRSDefaultGeometry() throws DataException;

        /**

         * Exports this store to another store.

         *

         * @param explorer

         *            {@link DataServerExplorer} target

         * @param params

         *            New parameters of this store that will be used on the target

         *            explorer

         *

         * @throws DataException

         *

         * @Deprecated this method is unstable

         */

        public void export(DataServerExplorer explorer, NewFeatureStoreParameters params)

                        throws DataException;

        /*

         * =============================================================

         *

         * Query related services

         */

        /**

         * Returns all available features in the store.

         * <p>

         * <em>

         * <strong>NOTE:</strong> if you use this method to get a 

         * {@link FeatureSet}, you  must get sure it is disposed 

         * (@see {@link DisposableIterator#dispose()}) in any case, even if an 

         * error occurs while getting the data. It is recommended to use the 

         * <code>accept</code> methods instead, which handle everything for you. 

         * Take into account the accept methods may use a fast iterator to 

         * get the features.

         * </em>

         * </p>

         * 

         * @see #accept(org.gvsig.tools.visitor.Visitor)

         * 

         * @return a collection of features

         * @throws ReadException

         *             if there is any error while reading the features

         */

        FeatureSet getFeatureSet() throws DataException;

        /**

         * Returns a subset of features taking into account the properties and

         * restrictions of the FeatureQuery.

         * <p>

         * <em>

         * <strong>NOTE:</strong> if you use this method to get a 

         * {@link FeatureSet}, you  must get sure it is disposed 

         * (@see {@link DisposableIterator#dispose()}) in any case, even if an 

         * error occurs while getting the data. It is recommended to use the 

         * <code>accept</code> methods instead, which handle everything for you. 

         * Take into account the accept methods may use a fast iterator to 

         * get the features.

         * </em>

         * </p>

         * 

         * @see #accept(org.gvsig.tools.visitor.Visitor,

         *      org.gvsig.fmap.dal.DataQuery)

         * 

         * @param featureQuery

         *            defines the characteristics of the features to return

         * @return a collection of features

         * @throws ReadException

         *             if there is any error while reading the features

         */

        FeatureSet getFeatureSet(FeatureQuery featureQuery)

         throws DataException;

        /**

         * Loads a subset of features taking into account the properties and

         * restrictions of the FeatureQuery. Feature loading is performed by calling

         * the Observer, once each loaded Feature.

         *

         * @param featureQuery

         *            defines the characteristics of the features to return

         * @param observer

         *            to be notified of each loaded Feature

         * @throws DataException

         *             if there is any error while loading the features

         */

        void getFeatureSet(FeatureQuery featureQuery, Observer observer)

        throws DataException;

        /**

         * Loads all available feature in the store. The loading of Features is

         * performed by calling the Observer, once each loaded Feature.

         *

         * @param observer

         *            to be notified of each loaded Feature

         * @throws DataException

         *             if there is any error while loading the features

         */

        void getFeatureSet(Observer observer) throws DataException;

        /**

         * Returns the feature given its reference.

         *

         * @param reference

         *            a unique FeatureReference

         * @return

         *                 The Feature

         *

         * @throws DataException

         *

         */

        public Feature getFeatureByReference(FeatureReference reference) throws DataException;

        /**

         * Returns the feature given its reference and feature type.

         *

         * @param reference

         *            a unique FeatureReference

         *

         * @param featureType

         *            FeatureType to which the requested Feature belongs

         *

         * @return

         *                 The Feature

         *

         * @throws DataException

         *

         */

        public Feature getFeatureByReference(FeatureReference reference, FeatureType featureType)

                        throws DataException;

        /*

         * =============================================================

         *

         * Editing related services

         */

        /**

         * Enters editing state.

         */

        public void edit() throws DataException;

        /**

         * Enters editing state specifying the editing mode.

         *

         * @param mode

         *

         * @throws DataException

         */

        public void edit(int mode) throws DataException;

        /**

         * Cancels all editing since the last edit().

         *

         * @throws DataException

         */

        public void cancelEditing() throws DataException;

        /**

         * Exits editing state.

         *

         * @throws DataException

         */

        public void finishEditing() throws DataException;

        /**

         * Indicates whether this store is in editing state.

         *

         * @return

         *                 true if this store is in editing state, false if not.

         */

        public boolean isEditing();

        /**

         * Indicates whether this store is in appending state. In this state the new

         * features are automatically inserted at the end of the {@link FeatureSet}.

         *

         * @return true if this store is in appending state.

         */

        public boolean isAppending();

        /**

         * Updates a {@link FeatureType} in the store with the changes in the

         * {@link EditableFeatureType}.<br>

         *

         * Any {@link FeatureSet} from this store that are used will be invalidated.

         *

         * @param featureType

         *            an {@link EditableFeatureType} with the changes.

         *

         * @throws DataException

         */

        public void update(EditableFeatureType featureType) throws DataException;

        /**

         * Updates a {@link Feature} in the store with the changes in the

         * {@link EditableFeature}.<br>

         *

         * Any {@link FeatureSet} from this store that was still in use will be

         * invalidated. You can override this using

         * {@link FeatureSet#update(EditableFeature)}.

         *

         * @param feature

         *            the feature to be updated

         *

         * @throws DataException

         */

        public void update(EditableFeature feature) throws DataException;

        /**

         * Deletes a {@link Feature} from the store.<br>

         *

         * Any {@link FeatureSet} from this store that was still in use will be

         * invalidated. You can override this using {@link Iterator#remove()} from

         * {@link FeatureSet}.

         *

         * @param feature

         *            The feature to be deleted.

         *

         * @throws DataException

         */

        public void delete(Feature feature) throws DataException;

        /**

         * Inserts a {@link Feature} in the store.<br>

         *

         * Any {@link FeatureSet} from this store that was still in use will be

         * invalidated. You can override this using

         * {@link FeatureSet#insert(EditableFeature)}.

         *

         * @param feature

         *            The feature to be inserted

         *

         * @throws DataException

         */

        public void insert(EditableFeature feature) throws DataException;

        /**

         * Creates a new feature using the default feature type and returns it as an

         * {@link EditableFeature}

         *

         * @return a new feature in editable state

         *

         * @throws DataException

         */

        public EditableFeature createNewFeature() throws DataException;

        /**

         * Creates a new feature of the given {@link FeatureType} and uses the given

         * {@link Feature} as default values to initialize it.

         *

         * @param type

         *            the new feature's feature type

         *

         * @param defaultValues

         *            a feature whose values are used as default values for the new

         *            feature.

         *

         * @return the new feature.

         *

         * @throws DataException

         */

        public EditableFeature createNewFeature(FeatureType type,

                        Feature defaultValues) throws DataException;

        /**

         * Creates a new feature of the given {@link FeatureType}. The flag

         * defaultValues is used to indicate whether the new feature should be

         * initialized with default values or not.

         *

         * @param type

         *            the new feature's feature type

         *

         * @param defaultValues

         *                         if true the new feature is initialized with each attribute's default value.

         *

         * @return

         *                 the new feature

         *

         * @throws DataException

         */

        public EditableFeature createNewFeature(FeatureType type,

                        boolean defaultValues) throws DataException;

        /**

         * Creates a new feature of default {@link FeatureType}. The flag

         * defaultValues is used to indicate whether the new feature should be

         * initialized with default values or not.

         *

         * @param defaultValues

         *                                 if true the new feature is initialized with each attribute's default value.

         *

         * @return

         *                 the new feature

         *

         * @throws DataException

         */

        public EditableFeature createNewFeature(boolean defaultValues)

                        throws DataException;

        /**

         * Applies the validation rules associated to the given mode to the active {@link FeatureSet}.

         *

         * @param mode

         *            can be one of {MODE_QUERY, MODE_FULLEDIT, MODE_APPEND}

         *

         * @throws DataException

         */

        public void validateFeatures(int mode) throws DataException;

        /**

         * Indicates whether this store supports append mode.

         *

         * @return

         *                 true if this store supports append mode.

         */

        public boolean isAppendModeSupported();

        /**

         * Initiates an editing group. This is typically used to group series of

         * store editing operations.

         *

         * @param description

         *            Description of the editing group.

         *

         * @throws NeedEditingModeException

         */

        public void beginEditingGroup(String description)

                        throws NeedEditingModeException;

        /**

         * Finishes an editing group.

         *

         * @throws NeedEditingModeException

         */

        public void endEditingGroup() throws NeedEditingModeException;

        /*

         * =============================================================

         *

         * Index related services

         */

        /**

         * Creates a FeatureIndex with name indexName, given the attributeName and

         * its featureType.

         *

         * @param featureType

         *            The FeatureType to which the indexed attribute belongs.

         *

         * @param attributeName

         *            The name of the attributed to be indexed

         *

         * @param indexName

         *            The index name

         *

         * @return the resulting FeatureIndex

         *

         *

         * @throws FeatureIndexException

         */

        public FeatureIndex createIndex(FeatureType featureType,

                        String attributeName, String indexName) throws DataException;

        /**

         * Creates a FeatureIndex with name indexName, given the attributeName and

         * its featureType. This method is intended for background indexing. It

         * receives an observer that will be notified by the process.

         *

         * @param featureType

         *            The FeatureType to which the indexed attribute belongs.

         *

         * @param attributeName

         *            The name of the attributed to be indexed

         *

         * @param indexName

         *            The index name

         *

         * @param observer

         *            an observer that will be notified of the indexing process

         *            progress.

         *

         * @return the resulting FeatureIndex

         *

         *

         * @throws FeatureIndexException

         */

        public FeatureIndex createIndex(FeatureType featureType,

                        String attributeName, String indexName, Observer observer) throws DataException;

        /**

         * Returns a FeatureIndexes structure containing all available indexes in

         * the store.

         *

         * @return

         */

        public FeatureIndexes getIndexes();

        /*

         * =============================================================

         *

         * Selection related services

         */

        /**

         * Sets the selection to the passed {@link FeatureSet}

         *

         * @param selection

         *            A {@link FeatureSet} with the requested selection

         */

        public void setSelection(FeatureSet selection) throws DataException;

        /**

         * Creates a {@link FeatureSelection}

         *

         * @return

         *                 a {@link FeatureSelection}

         *

         * @throws DataException

         */

        public FeatureSelection createFeatureSelection() throws DataException;

        /**

         * Returns the current {@link FeatureSelection}.

         *

         * @return

         *                 current {@link FeatureSelection}.

         *

         * @throws DataException

         */

        public FeatureSelection getFeatureSelection() throws DataException;

        /*

         * =============================================================

         *

         * Lock related services

         */

        /**

         * Indicates whether this store supports locks.

         *

         * @return

         *                 true if this store supports locks, false if not.

         */

        public boolean isLocksSupported();

        /**

         * Returns the set of locked features

         *

         * @return

         *                 set of locked features

         *

         * @throws DataException

         */

        public FeatureLocks getLocks() throws DataException;

        /*

         * =============================================================

         * Transforms related services

         * =============================================================

         */

        /**

         * Returns this store transforms

         *

         * @return

         *                 this store transforms

         */

        public FeatureStoreTransforms getTransforms();

        /**

         * Returns a new {@link FeatureQuery} associated to this store.

         *

         * @return

         *                 a new {@link FeatureQuery} associated to this store.

         */

        public FeatureQuery createFeatureQuery();

        /**

         * Returns featue count of this store.

         *

         * @return

         * @throws DataException

         */

        public long getFeatureCount() throws DataException;

        /**

         * Creates a vectorial cache that is used to save and retrieve data.

         * @param name the cache name.

         * @param parameters parameters to create the stores used to save data.

         * @throws DataException 

         */

        public void createCache(String name, DynObject parameters) throws DataException;

        /**

         * @return the vectorial cache

         */

        public FeatureCache getCache();

}