svn-gvsig-desktop / branches / v02_desarrollo / libraries / sld / temp / org.gvsig.sldsupport.lib.api / src / main / java / org / gvsig / sldsupport / filterencoding / operations / IsNullOperator.java @ 40779
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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.sldsupport.filterencoding.operations; |
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import java.util.ArrayList; |
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import java.util.Hashtable; |
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import org.gvsig.i18n.Messages; |
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/**
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*
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* Implements the funcionality of the IsNull operator which can be
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* used in a Filter Encoding expression
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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 IsNullOperator extends Operator { |
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private ArrayList<Expression> arguments = new ArrayList<Expression>(); |
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public String getName() { |
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return OperationTags.ISNULL_OP;
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} |
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public IsNullOperator(Hashtable<String, Object> symbol_table) { |
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super(symbol_table);
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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 Object evaluate()throws ExpressionException { |
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if(arguments.size() > 1) |
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throw new ExpressionException(ExpressionException.INCORRECT_NUMBER_OF_ARGUMENTS); |
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else if(arguments.get(0)== null) |
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return true; |
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return false; |
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} |
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public String getPattern() { |
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return OperationTags.ISNULL_OP+"(" |
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+ Messages.getText(OperationTags.OPERAND) +")\n"+
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Messages.getText(OperationTags.OPERAND) +" = "+
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Messages.getText(OperationTags.NUMERIC_OR_BOOLEAN_CONSTANT); |
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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() throws ExpressionException { |
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if(arguments.size() != 1) |
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throw new ExpressionException(ExpressionException.INCORRECT_NUMBER_OF_ARGUMENTS); |
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} |
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} |