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.expression;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

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.SLDTags;

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

import org.gvsig.sldsupport.sld.filter.expression.SLDExpression;

import org.gvsig.sldsupport.sld.filter.expression.operator.SLDFunction;

public class FunctionElement {

    public static void append(SLDFunction obj, XmlBuilder xb, String version)

        throws InvalidSLDObjectException, UnsupportedSLDObjectException {

        Map<String, String> atts = new HashMap<String, String>();

        atts.put(SLDTags.NAME_ATTR, obj.getFunctionName());

        xb.openTag(FilterTags.FUNCTION, atts);

        for (int i = 0; i < obj.getArguments().size(); i++) {

            ExpressionElement.append(obj.getArguments().get(i), xb, version);

        }

        xb.closeTag();

    }

    public static SLDFunction parse(XmlPullParser parser, String version)

        throws XmlPullParserException, IOException, SLDReadException {

        parser.require(XmlPullParser.START_TAG, null, FilterTags.FUNCTION);

        String fname = parser.getAttributeValue(null, SLDTags.NAME_ATTR);

        if (fname == null) {

            throw new SLDReadException(

                "Attribute 'name' not found in SLD function");

        }

        SLDFunction resp = new SLDFunction();

        resp.setFunctionName(fname);

        int tag = parser.nextTag();

        String name = parser.getName();

        SLDExpression expre = null;

        while (!(SLDUtils.isStr(name, SLDTags.FUNCTION) && (tag == XmlPullParser.END_TAG))) {

            expre = ExpressionElement.parse(parser, version);

            resp.getArguments().add(expre);

            // =========== Get current values

            tag = parser.getEventType();

            name = parser.getName();

        }

        parser.nextTag();

        return resp;

    }

}