root / trunk / extensions / extSymbology / src / org / gvsig / symbology / fmap / rendering / filter / operations / MultOperator.java @ 20768
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/* gvSIG. Sistema de Informaci�n Geogr�fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib��ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package org.gvsig.symbology.fmap.rendering.filter.operations; |
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import java.util.ArrayList; |
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import java.util.Hashtable; |
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import com.hardcode.gdbms.engine.values.Value; |
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import com.iver.andami.PluginServices; |
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/**
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* Implements the funcionality of the multiplication operator
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*
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* @author Pepe Vidal Salvador - jose.vidal.salvador@iver.es
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*
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*/
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public class MultOperator implements Expression{ |
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ArrayList<Expression> arguments = new ArrayList<Expression>(); |
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public Object evaluate(Hashtable<String, Value> symbol_table)throws ExpressionException { |
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Double result = (Double)((Expression)arguments.get(0)).evaluate(symbol_table); |
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for (int i = 1; i < arguments.size(); i++){ |
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Expression function = (Expression)arguments.get(i); |
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result *= ((Double)function.evaluate(symbol_table));
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} |
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return result;
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} |
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public void addArgument(int i, Expression arg) { |
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arguments.add(i, arg); |
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} |
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public String getPattern() { |
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return "("+PluginServices.getText(this,"operand") |
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+" * "+PluginServices.getText(this, "operand")+ ")\n"+ |
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PluginServices.getText(this,"operand") +" = "+ |
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PluginServices.getText(this,"numeric_value" ); |
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} |
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public ArrayList<Expression> getArguments() { |
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return arguments;
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} |
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public void setArguments(ArrayList<Expression> arguments) { |
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this.arguments = arguments;
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} |
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public void check(Hashtable<String, Value> symbol_table) throws ExpressionException { |
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for (int i = 0; i < arguments.size(); i++) { |
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if(!(arguments.get(i).evaluate(symbol_table)instanceof Double)) |
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throw new ExpressionException(ExpressionException.CLASS_CASTING_EXCEPTION); |
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} |
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} |
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} |