svn-gvsig-desktop / tags / v2_0_0_Build_2055 / libraries / libFMap_dal / src / org / gvsig / fmap / dal / feature / FeatureCache.java @ 38961
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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/*
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* AUTHORS (In addition to CIT):
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* 2009 {Iver T.I.} {Task}
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*/
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package org.gvsig.fmap.dal.feature; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.spi.FeatureStoreProvider; |
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import org.gvsig.fmap.geom.primitive.Envelope; |
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/**
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* This class represents a vectorial cache that is used to save and retrieve
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* {@link FeatureSet}s. First time that a {@link FeatureStore} have to retrieve
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* data from a {@link FeatureStoreProvider} can save the {@link FeatureSet} in
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* the cache with its envelope. Next time that the store has to access to a envelope
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* contained in the previous envelope can retrieve the features directly
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* from the cache and it is not necessary to retrieve data from the provider.
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*
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* The cache supports different scales and creates
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*
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* @author <a href="mailto:jpiera@gvsig.org">Jorge Piera</a>
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*/
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public interface FeatureCache { |
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/**
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* Delete all the features for a concrete scale.
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* @param scale
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* The scale.
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* @throws DataException
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*/
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public void delete(double scale) throws DataException; |
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/**
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* Delete all the features for all the scales in the cache system.
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* @throws DataException
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*/
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public void deleteAll() throws DataException; |
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/**
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* Add a set of features contained in a envelope for a concrete scale.
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* @param featureSet
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* The feature set retrieved from the server.
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* @throws DataException
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*/
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public void addFeatures(FeatureSet featureSet, FeatureStore featureStore) throws DataException; |
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/**
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* Return a feature set form a concrete envelope and a scale.
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* @param envelope
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* The envelope.
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* @param scale
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* The scale.
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* @return
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* A feature set contained in the evelope.
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* @throws DataException
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*/
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public FeatureSet getFeatureSet(Envelope envelope, double scale) throws DataException; |
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} |
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