root / branches / dal_time_support / libraries / libFMap_dal / src / org / gvsig / fmap / dal / feature / FeatureQuery.java @ 34628
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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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* 2008 {DiSiD Technologies} {Create Parameter object to define FeatureCollections queries}
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*/
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package org.gvsig.fmap.dal.feature; |
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import org.gvsig.fmap.dal.DataQuery; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.lang.Cloneable; |
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/**
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* Defines the properties of a collection of Features, as a result of a query
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* through a FeatureStore.
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* <p>
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* A FeatureQuery is always defined by a FeatureType, or by the list of
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* attribute names of the FeatureStore to return.
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* </p>
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* <p>
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* The filter allows to select Features whose properties have values with the
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* characteristics defined by the filter.
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* </p>
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* <p>
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* The order is used to set the order of the result FeatureCollection, based on
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* the values of the properties of the Features.
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* </p>
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* <p>
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* The scale parameter can be used by the FeatureStore as a hint about the
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* quality or resolution of the data needed to view or operate with the data
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* returned. As an example, the FeatureStore may use the scale to return only a
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* representative subset of the data, or maybe to return Features with less
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* detail, like a point or a line instead of a polygon.
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* </p>
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* <p>
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* If an implementation of FeatureStore is able to get other parameters to
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* customize the behavior of the getDataCollection methods, there is an option
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* to set more parameters through the setAttribute method.
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* </p>
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*
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* @author 2009- <a href="cordinyana@gvsig.org">C?sar Ordi?ana</a> - gvSIG team
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*/
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public interface FeatureQuery extends DataQuery, Cloneable { |
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/**
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* Returns the names of the attributes to load from each {@link Feature}.
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*
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* @return the attribute names to load
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*/
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String[] getAttributeNames(); |
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/**
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* Sets the names of the attributes to load from each {@link Feature}.
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*
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* @param attributeNames
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* the attribute names to load
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*/
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void setAttributeNames(String[] attributeNames); |
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/**
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* Sets the {@link FeatureType} of the {@link Feature}s to load. It may be
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* used as an alternative way to set a subset of the list of attribute names
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* to load, by creating a sub-FeatureType.
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*
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* @param featureType
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* the feature type of the data to load
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*/
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void setFeatureType(FeatureType featureType);
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/**
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* Returns the {@link FeatureType} id of the {@link Feature}s to load.
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*
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* @return the {@link FeatureType} id of the {@link Feature}s to load
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*/
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String getFeatureTypeId();
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/**
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* Sets the {@link FeatureType} id of the {@link Feature}s to load. This way
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* all {@link Feature} attributes will be loaded.
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*
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* @param featureTypeId
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* the {@link FeatureType} id of the {@link Feature}s to load
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*/
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void setFeatureTypeId(String featureTypeId); |
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/**
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* Returns the filter to apply to the {@link Feature}s to load.
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*
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* @return the filter
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*/
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Evaluator getFilter(); |
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/**
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* Sets the filter to apply to the {@link Feature}s to load.
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*
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* @param filter
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* the filter to apply to the {@link Feature}s to load
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*/
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void setFilter(Evaluator filter);
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/**
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* Returns if a filter has been defined for the query.
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*
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* @return if a filter has been defined for the query
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*/
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boolean hasFilter();
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/**
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* Returns the order of the {@link Feature}s to load.
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*
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* @return the order of the {@link Feature}s to load
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*/
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FeatureQueryOrder getOrder(); |
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/**
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* Sets the order of the {@link Feature}s to load.
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*
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* @param order
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* the order of the {@link Feature}s to load
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*/
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void setOrder(FeatureQueryOrder order);
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/**
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* Returns if an order has been set for the elements returned by the query.
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*
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* @return if an order has been set for the elements returned by the query
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*/
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boolean hasOrder();
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/**
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* @deprecated to be removed in gvSIG 2.0
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* @see #clone()
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*/
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FeatureQuery getCopy(); |
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/**
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* Returns the maximum number of elements to return with this query.
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* <p>
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* <strong>NOTE:</strong> this value may be ignored by the underlying data
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* source, or only used as a hint, so don't rely on it being used, as you
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* may actually get more values than the limit.
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* </p>
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*
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* @return the maximum number of elements to return with this query
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*/
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long getLimit();
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/**
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* Sets the maximum number of elements to return with this query.
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* <p>
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* <strong>NOTE:</strong> this value may be ignored by the underlying data
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* source, or only used as a hint, so don't rely on it being used, as you
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* may actually get more values than the limit.
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* </p>
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*
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* @param limit
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* the maximum number of elements to return with this query
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*/
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void setLimit(long limit); |
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/**
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* Returns the load page size, as the number of elements to be retrieved in
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* block by the data source. This value is only used as a hint to the
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* underlying data source, as a way to tell how many Features may be read in
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* a block.
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*
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* @return the load page size
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*/
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long getPageSize();
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/**
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* Sets the load page size, as the number of elements to be retrieved in
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* block by the data source. This value is only used as a hint to the
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* underlying data source, as a way to tell how many Features may be read in
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* a block.
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*
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* @param pageSize
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* the load page size
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*/
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void setPageSize(long pageSize); |
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} |