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.ArrayList;

import java.util.HashSet;

import java.util.Set;

import org.gvsig.sldsupport.exception.SLDReadException;

import org.gvsig.sldsupport.symbolizer.ISLDSymbolizer;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

/**

 * Implements the main class expresion where the parsing of a Filter

 * Encoding expression starts<br>

 *

 * A filter is any valid predicate expression that can be formed using the 

 * elements defined in the Filter Encoding specification. The root element

 * <Filter> contains the expression whichis created by combining the elements

 * defined in this specification

 * 

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

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

 */

public class Filter  {

        FComparisonOperator compOperator = null;

        FLogicOperator logicOperators = null; 

        FLogicOperatorNot notLogicOperator = null;

        FIsBetweenOperator isBetweenOperator = null;

        FIsNullOperator isNullOperator = null;

        FIsLikeOperator isLikeOperator = null;

//        FBinSpatialOperator binSpatialOperator = null;

        String expression = "";

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

        ArrayList<ISLDSymbolizer> symbolizers = new ArrayList<ISLDSymbolizer>();

        public void parse(XmlPullParser parser)

                        throws XmlPullParserException, IOException, SLDReadException {

                int currentTag;

                boolean end = false;

                currentTag = parser.next();

                expression = "( ";

                while (!end)

                {

                        switch(currentTag)

                        {

                        // case IXmlStreamReader..START_TAG:

                        case XmlPullParser.START_TAG:

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

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

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

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

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

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

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

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

                                        }

                                        compOperator = new FComparisonOperator();

                                        expression += "( ";

                                        compOperator.parse(parser ,parser.getName());        

                                        expression += compOperator.getOpExpressionStr();

                                        expression+= ") ";

                                        fieldNames.addAll(compOperator.getFieldNames());

                                }

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

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

                                        logicOperators = new FLogicOperator();

                                        expression += "( ";

                                        logicOperators.parse(parser,parser.getName());

                                        if (logicOperators.getNumOperators() < 2) {

                                                throw new SLDReadException(new Exception(

                                                                "Found " + logicOperators.getNumOperators()

                                                                + " operators, expected 2."));

                                        }

                                        expression += logicOperators.getOpExpressionStr();

                                        expression += ") ";

                                        fieldNames.addAll(logicOperators.getFieldNames());

                                }

                                else if (parser.getName().compareTo(FilterUtils.remNameSpace(FilterTags.NOT)) ==0) {

                                        notLogicOperator = new FLogicOperatorNot();

                                        expression += "( "+"! ";

                                        notLogicOperator.parse(parser,parser.getName());

                                        if (notLogicOperator.getNumOperators() > 1) {

                                                throw new SLDReadException(new Exception(

                                                                "Found " + notLogicOperator.getNumOperators()

                                                                + " operators, expected 1."));

                                        }

                                        expression += notLogicOperator.getOpExpressionStr();

                                        expression += ") ";

                                        fieldNames.addAll(notLogicOperator.getFieldNames());

                                }

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

                                        isBetweenOperator = new FIsBetweenOperator();

                                        expression += "( Ib ( ";

                                        isBetweenOperator.parse(parser, currentTag, parser.getName());

                                        if(isBetweenOperator.getInsideExpression()==null || isBetweenOperator.getLowerBoundary()==null

                                                        || isBetweenOperator.getUpperBoundary()==null) {

                                                throw new SLDReadException(new Exception(

                                                                "Bad parameters in is-between operator."));

                                        }

                                        expression += isBetweenOperator.getInExpressionStr()+","+isBetweenOperator.getLoExpressionStr()+

                                        ","+isBetweenOperator.getUpExpressionStr();

                                        expression += ") ) ";

                                }

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

                                        isNullOperator = new FIsNullOperator();

                                        expression += "( INull ";

                                        isNullOperator.parse(parser, currentTag, parser.getName());

                                        if(isNullOperator.getPropName()==null) {

                                                throw new SLDReadException(new Exception(

                                                                "Bad or missing name in is-null operator."));

                                        }

                                        expression += isNullOperator.getOpExpressionStr();

                                        expression += ") ";

                                }

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

                                        isLikeOperator = new FIsLikeOperator();

                                        expression += "( IL ( ";

                                        String wild =parser.getAttributeValue("", FilterTags.WILDCHAR);

                                        String single = parser.getAttributeValue("",FilterTags.SINGLECHAR);

                                        String scape = parser.getAttributeValue("", FilterTags.ESCAPECHAR);

                                        expression += "( "+wild+" , "+single+" , "+scape+" ) , ";

                                        isLikeOperator.parse(parser, currentTag, parser.getName());

                                        if(isLikeOperator.getLiteral()==null || isLikeOperator.getPropName()==null) {

                                                throw new SLDReadException(new Exception(

                                                                "Bad name or literal in is-like operator."));

                                        }

                                        expression += "( "+isLikeOperator.getPropName()+" , "+isLikeOperator.getLiteral()+" ) ";

                                        expression += ") ) ";

                                }

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

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

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

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

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

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

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

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

//                                String func =  parser.getName();

//                                binSpatialOperator = new FBinSpatialOperator();

//                                expression += "( "+func+" ";

//                                binSpatialOperator.parse(parser, currentTag, parser.getName());

//                                if(binSpatialOperator.getPropertyName()==null)

//                                throw new Error ("binSpatialOperator mal!");

//                                expression += binSpatialOperator.getOpExpressionStr();

//                                expression += ") ";

//                                }

                                break;

                        case XmlPullParser.END_TAG:

                                if (parser.getName().compareTo(

                                                FilterUtils.remNameSpace(FilterTags.FILTER)) == 0)

                                        end = true;

                                break;

                        case XmlPullParser.TEXT:

                                break;

                        }

                        if (!end)

                                currentTag = parser.next();

                }

                expression += ") ";

        }

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

        public void addSymbolizer2Filter(ISLDSymbolizer symbol) { symbolizers.add(symbol); }

        public ArrayList<ISLDSymbolizer> getSymbolizers() { return symbolizers; }

        public FComparisonOperator getCompOperator() {return compOperator;}

        public FLogicOperator getLogicOperator() {return logicOperators;}

        public FLogicOperatorNot getNotLogicOperator() {return notLogicOperator;}

        public String getExpression() {return this.expression;}

}