svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.db / org.gvsig.fmap.dal.db.jdbc / src / main / java / org / gvsig / fmap / dal / store / jdbc2 / spi / expressionbuilder / formatters / ComputedAttribute.java @ 46104
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2020 gvSIG Association.
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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 3
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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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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.dal.store.jdbc2.spi.expressionbuilder.formatters; |
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import org.gvsig.expressionevaluator.Code; |
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import org.gvsig.expressionevaluator.Expression; |
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import org.gvsig.expressionevaluator.ExpressionBuilder; |
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import org.gvsig.expressionevaluator.ExpressionBuilder.Value; |
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import org.gvsig.expressionevaluator.Formatter; |
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import org.gvsig.expressionevaluator.GeometryExpressionBuilder; |
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import org.gvsig.fmap.dal.SQLBuilder; |
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import org.gvsig.fmap.dal.expressionevaluator.FeatureAttributeEmulatorExpression; |
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import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor; |
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import org.gvsig.fmap.dal.feature.FeatureAttributeEmulator; |
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import org.gvsig.fmap.dal.feature.FeatureExtraColumns; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_FEATURE_TYPE; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_JDBCHELPER; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_QUERY; |
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/**
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*
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* @author jjdelcerro
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*/
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public class ComputedAttribute implements Formatter<Value> { |
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private final SQLBuilder sqlbuilder; |
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private final Formatter<Value> formatter; |
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public ComputedAttribute(SQLBuilder sqlbuilder, Formatter<Value> formatter) { |
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this.sqlbuilder = sqlbuilder;
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this.formatter = formatter;
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} |
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@Override
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public boolean canApply(ExpressionBuilder.Value value) { |
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if (value instanceof ExpressionBuilder.Variable) { |
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FeatureType featureType = (FeatureType) value.getProperty(PROP_FEATURE_TYPE); |
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if( featureType==null ) { |
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return false; |
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} |
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JDBCHelper jdbcHelper = (JDBCHelper) value.getProperty(PROP_JDBCHELPER); |
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if( jdbcHelper==null ) { |
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return false; |
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} |
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ExpressionBuilder.Variable variable = (ExpressionBuilder.Variable) value; |
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FeatureAttributeDescriptor attr = featureType.getAttributeDescriptor(variable.name()); |
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if (attr == null) { |
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FeatureQuery query = (FeatureQuery) value.getProperty(PROP_QUERY); |
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if (query == null) { |
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return false; |
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} |
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FeatureExtraColumns extraColumn = query.getExtraColumn(); |
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if (extraColumn == null) { |
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return false; |
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} |
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attr = extraColumn.get(variable.name()); |
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if (attr == null ) { |
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return false; |
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} |
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} |
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if (!attr.isComputed()) {
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return false; |
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} |
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FeatureAttributeEmulator emulator = attr.getFeatureAttributeEmulator(); |
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if( !(emulator instanceof FeatureAttributeEmulatorExpression) ) { |
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return false; |
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} |
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Expression expr = ((FeatureAttributeEmulatorExpression)emulator).getExpression();
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return jdbcHelper.supportExpression(featureType, expr.getPhrase());
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} |
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return false; |
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} |
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@Override
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public String format(Value value) { |
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Value valueExpr = this.expandedValue(value);
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return "("+ this.formatter.format(valueExpr)+")"; |
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} |
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public Value expandedValue(Value value) {
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FeatureType featureType = (FeatureType) value.getProperty(PROP_FEATURE_TYPE); |
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ExpressionBuilder.Variable variable = (ExpressionBuilder.Variable) value; |
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FeatureAttributeDescriptor attr = featureType.getAttributeDescriptor(variable.name()); |
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if (attr == null) { |
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FeatureQuery query = (FeatureQuery) value.getProperty(PROP_QUERY); |
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attr = query.getExtraColumn().get(variable.name()); |
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} |
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FeatureAttributeEmulator emulator = attr.getFeatureAttributeEmulator(); |
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Expression expr = ((FeatureAttributeEmulatorExpression)emulator).getExpression();
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Code code = expr.getCode(); |
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GeometryExpressionBuilder builder = this.sqlbuilder.expression();
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Value valueExpr = code.toValue(builder); |
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return valueExpr;
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} |
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} |