Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package org.gvsig.sldsupport.filterencoding;

import java.io.IOException;

import java.util.HashSet;

import java.util.Set;

import org.gvsig.sldsupport.exception.SLDReadException;

import org.gvsig.sldsupport.util.SLDUtils;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

/**

 * Implements the main functionalities to parse an Filter Encoding

 * expression<br>

 * The expression element is an abstrac element which means that it

 * does not really exist and its only purpose is to act as a placeholder

 * for the elements and combinations of elements that can be used o form

 * expressions.

 *

 * @see http://www.opengeospatial.org/standards/filter

 * @author pepe vidal salvador - jose.vidal.salvador@iver.es

 */

public class FExpression  {

        protected String literal;

        protected String propertyName;

        protected String function;

        protected String expressionType;

        protected FExpression insideExpression;

        protected FExpression insideExpression2;

        boolean isPropertyName = false;

        String expressionStr = "";

        Set <String> fieldNames = new HashSet <String>();

        double value;

        public void parse(XmlPullParser parser, int Tag2, String expressionType)

                        throws XmlPullParserException, IOException, SLDReadException {

                int currentTag;

                boolean end = false;

                currentTag = Tag2;

                this.expressionType = expressionType;

                while (!end)

                {

                        switch(currentTag)

                        {

                        case XmlPullParser.START_TAG:

                                if (parser.getName().compareTo(

                                                FilterUtils.remNameSpace(FilterTags.PROPERTYNAME))==0) {

                                        this.propertyName = parser.nextText();

                                        fieldNames.add(this.propertyName);

                                        isPropertyName = true;

                                        end = true;

                                        expressionStr +="["+this.propertyName +"] ";

                                }

                                else if (parser.getName().compareTo(

                                                FilterUtils.remNameSpace(FilterTags.LITERAL))==0) {

                                        this.literal = parser.nextText();

                                        String myLiteral = this.literal;

                                        if (!this.literal.startsWith("#"))

                                                if (SLDUtils.isANumber(this.literal)) {

                                                        setValue(Double.valueOf(this.literal));

                                                } else {

                                                        /*

                                                         * Parche para leer las leyendas generadas con versiones anteriores que

                                                         * no pon?an comillas para identificar los literales

                                                         */

                                                        if (!(this.literal.startsWith("\"") && this.literal.endsWith("\""))){

                                                                myLiteral = "\""+this.literal +"\"";

                                                        }

                                                        /* Fin del parche */

                                                }

                                        end = true;

                                        expressionStr += myLiteral +" ";

                                }

                                else if (parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.FUNCTION))==0) {

                                        this.function = parser.nextText();

                                        end = true;

                                }

                                else if ((parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.ADD))==0) ||

                                (parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.DIV))==0) ||

                                (parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.MULT))==0) ||

                                (parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.SUB))==0) ){

                                        String operation = parser.getName();

                                        currentTag = parser.nextTag();

                                        this.insideExpression = new FExpression();

                                        expressionStr += "( ";

                                        this.insideExpression.parse(parser,currentTag,parser.getName());

                                        expressionStr += insideExpression.getExpressionStr();

                                        expressionStr += FilterUtils.getSymbol4Expression("ogc:"+operation)+" ";

                                        fieldNames.addAll(insideExpression.getFieldNames());

                                        currentTag = parser.nextTag();

                                        this.insideExpression2 = new FExpression();

                                        this.insideExpression2.parse(parser,currentTag,parser.getName());

                                        expressionStr += insideExpression2.getExpressionStr();

                                        expressionStr += ") ";

                                        fieldNames.addAll(insideExpression2.getFieldNames());

                                        parser.nextTag();

                                        /*

                                        if (insideExpression == null && insideExpression2 == null) {

                                        }

                                        */

                                        end = true;

                                }

                                break;

                        case XmlPullParser.END_TAG:

                                if (parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.PROPERTYNAME))!=0 &&

                                                parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.LITERAL))!=0 &&

                                                parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.FUNCTION))!=0 &&

                                                parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.ADD))!=0 &&

                                                parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.DIV))!=0 &&

                                                parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.MULT))!=0 &&

                                                parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.SUB))!=0) {

                                        end = true;

                                }

                                break;

                        case XmlPullParser.TEXT:

                                break;

                        }

                        if (!end)

                                currentTag = parser.next();

                }

        }

        public String getLiteral() { return literal; }

        public void setLiteral(String literal) {

                this.literal = literal; }

        public String getPropertyName() { return propertyName; }

        public void setPropertyName(String propertyName) { this.propertyName = propertyName; }

        public double evaluate() { return this.value; }

        public void setValue(double value) { this.value = value; }

        public Set<String> getFieldNames() { return fieldNames; }

        public boolean isPropertyName() {return isPropertyName;}

        public String getExpressionType() {return expressionType;}

        public FExpression getInsideExpression() {return insideExpression;}

        public FExpression getInsideExpression2() {return insideExpression2;}

        public String getExpressionStr() {return expressionStr;}

}