Library: org.gvsig.sldtools

/*******************************************************************************

 *

 *   gvSIG. Desktop Geographic Information System.

 *  

 *   Copyright (C) 2007-2013 gvSIG Association.

 *  

 *   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 3

 *   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., 51 Franklin Street, Fifth Floor, Boston,

 *   MA  02110-1301, USA.

 *  

 *   For any additional information, do not hesitate to contact us

 *   at info AT gvsig.com, or visit our website www.gvsig.com.

 *   

 *******************************************************************************/

package org.gvsig.sldsupport.impl.sld.parsing.filteroperator.comparison;

import java.io.IOException;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlPullParserException;

import org.gvsig.sldsupport.exception.InvalidSLDObjectException;

import org.gvsig.sldsupport.exception.SLDReadException;

import org.gvsig.sldsupport.exception.UnsupportedSLDObjectException;

import org.gvsig.sldsupport.impl.util.SLDUtils;

import org.gvsig.sldsupport.impl.util.XmlBuilder;

import org.gvsig.sldsupport.sld.filter.FilterTags;

import org.gvsig.sldsupport.sld.filter.operator.comparison.SLDIsNullOperator;

public class IsNullComparisonElement {

    public static void append(SLDIsNullOperator obj, XmlBuilder xb,

        String version) throws InvalidSLDObjectException,

        UnsupportedSLDObjectException {

        xb.openTag(FilterTags.PROPERTYISNULL);

        // property name

        xb.writeTag(FilterTags.PROPERTYNAME, obj.getPropertyName());

        // =================

        xb.closeTag();

    }

    public static SLDIsNullOperator parse(XmlPullParser parser, String version)

        throws XmlPullParserException, IOException, SLDReadException {

        parser

            .require(XmlPullParser.START_TAG, null, FilterTags.PROPERTYISNULL);

        SLDIsNullOperator resp = new SLDIsNullOperator();

        int tag = 0;

        String txt = null;

        tag = parser.nextTag();

        String name = parser.getName();

        while (!(SLDUtils.isStr(name, FilterTags.PROPERTYISNULL) && (tag == XmlPullParser.END_TAG))) {

            switch (tag) {

            case XmlPullParser.START_TAG:

                if (SLDUtils.isStr(name, FilterTags.PROPERTYNAME)) {

                    txt = parser.nextText();

                    resp.setPropertyName(txt);

                    parser.nextTag();

                    break;

                }

                /*

                 * Any other entity causes parsing error

                 */

                throw new SLDReadException(

                    "Bad SLD file. Unexpected entity is IsNullOperator: "

                        + name);

            case XmlPullParser.END_TAG:

                break;

            case XmlPullParser.TEXT:

                break;

            }

            tag = parser.getEventType();

            name = parser.getName();

        }

        parser.nextTag();

        return resp;

    }

}