root / branches / dal_time_support / libraries / libFMap_dal / src / org / gvsig / fmap / dal / feature / impl / DefaultFeatureQuery.java @ 35200
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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.impl; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.Map; |
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import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.tools.ToolsLocator; |
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import org.gvsig.tools.dynobject.DynStruct; |
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import org.gvsig.tools.evaluator.AndEvaluator; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.persistence.PersistentState; |
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import org.gvsig.tools.persistence.exception.PersistenceException; |
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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 class DefaultFeatureQuery implements FeatureQuery { |
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public static final String SCALE_PARAM_NAME = "Scale"; |
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private Map queryParameters = new HashMap(); |
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private String featureTypeId = null; |
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private String[] attributeNames; |
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private Evaluator filter;
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/**
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* This boolean value is used to know if the current filter
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* has been added using the {@link FeatureQuery#addFilter(Evaluator)}
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* method or the {@link FeatureQuery#setFilter(Evaluator)} method.
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*/
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private boolean isAddFilter = true; |
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private FeatureQueryOrder order = new FeatureQueryOrder(); |
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private long limit; |
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private long pageSize; |
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/**
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* Creates a FeatureQuery which will load all available Features of a type.
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*
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* @param featureType
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* the type of Features of the query
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*/
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public DefaultFeatureQuery() {
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super();
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} |
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/**
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* Creates a FeatureQuery which will load all available Features of a type.
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*
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* @param featureType
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* the type of Features of the query
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*/
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public DefaultFeatureQuery(FeatureType featureType) {
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super();
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this.setFeatureType(featureType);
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} |
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/**
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* Creates a FeatureQuery with the type of features, a filter and the order
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* for the FeatureCollection.
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*
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* @param featureType
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* the type of Features of the query
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* @param filter
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* based on the properties of the Features
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* @param order
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* for the result
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*/
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public DefaultFeatureQuery(FeatureType featureType, Evaluator filter) {
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super();
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this.setFeatureType(featureType);
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this.filter = filter;
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} |
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/**
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* Creates a FeatureQuery with the type of features, a filter, the order for
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* the FeatureCollection and the view scale.
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*
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* @param featureType
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* the type of Features of the query
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* @param filter
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* based on the properties of the Features
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* @param order
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* for the result
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* @param scale
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* to view the Features.
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*/
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public DefaultFeatureQuery(FeatureType featureType, Evaluator filter,
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double scale) {
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this.setFeatureType(featureType);
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this.filter = filter;
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this.setScale(scale);
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} |
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/**
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* Creates a FeatureQuery which will load a list of attribute names of all
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* available Features.
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*
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* @param attributeNames
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* the list of attribute names to load
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*/
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public DefaultFeatureQuery(String[] attributeNames) { |
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super();
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this.attributeNames = attributeNames;
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} |
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/**
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* Creates a FeatureQuery with the list of attribute names of feature, a
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* filter and the order for the FeatureCollection.
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*
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* @param attributeNames
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* the list of attribute names to load
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* @param filter
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* based on the properties of the Features
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* @param order
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* for the result
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*/
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public DefaultFeatureQuery(String[] attributeNames, Evaluator filter) { |
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super();
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this.attributeNames = attributeNames;
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this.filter = filter;
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} |
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/**
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* Creates a FeatureQuery with the list of attribute names of feature, a
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* filter, the order for the FeatureCollection and the view scale.
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*
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* @param attributeNames
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* the list of attribute names to load
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* @param filter
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* based on the properties of the Features
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* @param order
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* for the result
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* @param scale
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* to view the Features.
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*/
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public DefaultFeatureQuery(String[] attributeNames, Evaluator filter, |
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double scale) {
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this.attributeNames = attributeNames;
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this.filter = filter;
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this.setScale(scale);
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} |
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public double getScale() { |
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Double scale = (Double) this.getQueryParameter(SCALE_PARAM_NAME); |
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if (scale == null) { |
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return 0; |
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} |
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return scale.doubleValue();
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} |
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public void setScale(double scale) { |
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this.setQueryParameter(SCALE_PARAM_NAME, new Double(scale)); |
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} |
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public Object getQueryParameter(String name) { |
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return queryParameters.get(name);
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} |
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public void setQueryParameter(String name, Object value) { |
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queryParameters.put(name, value); |
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} |
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public void setFeatureType(FeatureType featureType) { |
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this.featureTypeId = featureType.getId();
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Iterator iter = featureType.iterator();
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String attrs[] = new String[featureType.size()]; |
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FeatureAttributeDescriptor attr; |
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int i = 0; |
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while (iter.hasNext()) {
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attr = (FeatureAttributeDescriptor) iter.next(); |
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attrs[i] = attr.getName(); |
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i++; |
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} |
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this.attributeNames = attrs;
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} |
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public String[] getAttributeNames() { |
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return attributeNames;
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} |
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public void setAttributeNames(String[] attributeNames) { |
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this.attributeNames = attributeNames;
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} |
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public Evaluator getFilter() {
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return filter;
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} |
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public void setFilter(Evaluator filter) { |
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this.filter = filter;
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isAddFilter = false;
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} |
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public void addFilter(Evaluator targetFilter) { |
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if (isAddFilter){
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if (this.filter == null){ |
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this.filter = targetFilter;
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}else{
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if (targetFilter != null){ |
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if (this.filter instanceof AndEvaluator){ |
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((AndEvaluator)this.filter).addEvaluator(targetFilter);
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}else{
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this.filter = new AndEvaluator(this.filter); |
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((AndEvaluator)this.filter).addEvaluator(targetFilter);
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} |
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} |
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} |
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}else{
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this.filter = targetFilter;
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} |
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isAddFilter = true;
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} |
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public FeatureQueryOrder getOrder() {
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return order;
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} |
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public void setOrder(FeatureQueryOrder order) { |
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this.order = order;
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} |
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public boolean hasFilter() { |
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return this.filter != null; |
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} |
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public boolean hasOrder() { |
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return this.order != null && this.order.size() > 0; |
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} |
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public Object clone() throws CloneNotSupportedException { |
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DefaultFeatureQuery clone = (DefaultFeatureQuery) super.clone();
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// Clone attribute names array
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if (attributeNames != null) { |
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clone.attributeNames = new String[attributeNames.length]; |
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System.arraycopy(attributeNames, 0, clone.attributeNames, 0, |
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attributeNames.length); |
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} |
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// Clone order
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if (order != null) { |
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clone.order = (FeatureQueryOrder) order.clone(); |
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} |
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return clone;
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} |
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public FeatureQuery getCopy() {
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try {
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return (FeatureQuery) clone();
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} catch (CloneNotSupportedException e) { |
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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return null; |
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} |
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// DefaultFeatureQuery aCopy = new DefaultFeatureQuery();
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//
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// aCopy.featureTypeId = this.featureTypeId;
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//
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// if (this.attributeNames != null) {
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// aCopy.attributeNames = (String[]) Arrays
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// .asList(this.attributeNames).toArray(new String[0]);
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// }
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//
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// aCopy.filter = this.filter;
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//
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// if (this.order != null) {
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// aCopy.order = this.order.getCopy();
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// }
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//
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// return aCopy;
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} |
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public String getFeatureTypeId() { |
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return featureTypeId;
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} |
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public void setFeatureTypeId(String featureTypeId) { |
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this.featureTypeId = featureTypeId;
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} |
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public void saveToState(PersistentState state) throws PersistenceException { |
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// FIXME: falta por terminar de implementar
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state.set("queryParameters", this.queryParameters); |
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state.set("featureTypeId", this.featureTypeId); |
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state.set("attributeNames", this.attributeNames); |
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// state.set("filter", this.filter);
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state.set("limit", this.limit); |
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state.set("pageSize", this.pageSize); |
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} |
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public void loadFromState(PersistentState state) throws PersistenceException { |
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// FIXME: falta por terminar de implementar
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this.queryParameters = (Map) state.get("queryParameters"); |
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this.featureTypeId = state.getString("featureTypeId"); |
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this.attributeNames = (String[]) state.getArray("attributeNames", String.class); |
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this.filter = (Evaluator) state.get("filter"); |
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this.limit = state.getLong("limit"); |
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this.pageSize = state.getLong("pageSize"); |
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} |
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/**
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* Register the class on PersistenceManager
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*
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*/
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public static void registerPersistent() { |
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DynStruct definition = |
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ToolsLocator.getPersistenceManager() |
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.addDefinition(DefaultFeatureQuery.class, |
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"DefaultFeatureQuery",
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"DefaultFeatureQuery Persistent definition",
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null,
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null);
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definition.addDynFieldMap("queryParameters")
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.setClassOfItems(Object.class)
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.setMandatory(true);
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definition.addDynFieldString("featureTypeId").setMandatory(false); |
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definition.addDynFieldList("attributeNames")
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.setClassOfItems(String.class)
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.setMandatory(false);
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definition.addDynFieldObject("filter")
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.setClassOfValue(Evaluator.class) |
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.setMandatory(false);
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definition.addDynFieldObject("order")
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.setClassOfValue(FeatureQueryOrder.class) |
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.setMandatory(false);
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definition.addDynFieldLong("limit").setMandatory(false); |
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definition.addDynFieldLong("pageSize").setMandatory(false); |
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} |
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public long getLimit() { |
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return limit;
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} |
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public long getPageSize() { |
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return pageSize;
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} |
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public void setLimit(long limit) { |
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this.limit = limit;
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} |
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public void setPageSize(long pageSize) { |
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this.pageSize = pageSize;
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} |
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} |