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

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 *  

 *   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,

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package org.gvsig.sldsupport.impl.sld.parsing.expression;

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.SLDTags;

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

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

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

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

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

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

public class ExpressionElement {

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

        throws InvalidSLDObjectException, UnsupportedSLDObjectException {

        if (obj instanceof SLDLiteral) {

            SLDLiteral lit = (SLDLiteral) obj;

            xb.writeTag(SLDTags.LITERAL, lit.getValue());

        } else {

            if (obj instanceof SLDArithmeticOperator) {

                ArithmeticElement.append((SLDArithmeticOperator) obj, xb,

                    version);

            } else {

                if (obj instanceof SLDFunction) {

                    FunctionElement.append((SLDFunction) obj, xb, version);

                } else {

                    if (obj instanceof SLDPropertyName) {

                        SLDPropertyName pn = (SLDPropertyName) obj;

                        xb.writeTag(SLDTags.PROPERTY_NAME, pn.getPropertyName());

                    }

                }

            }

        }

    }

    public static SLDExpression parse(XmlPullParser parser, String version)

        throws XmlPullParserException, IOException, SLDReadException {

        String name = parser.getName();

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

            SLDPropertyName pn = new SLDPropertyName();

            String txt = parser.nextText();

            pn.setPropertyName(txt);

            // Go to next tag

            parser.nextTag();

            return pn;

        }

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

            SLDLiteral lit = new SLDLiteral();

            String txt = parser.nextText();

            lit.setValue(txt);

            // Go to next tag

            parser.nextTag();

            return lit;

        }

        if (SLDUtils.isStr(name, FilterTags.ADD)

            || SLDUtils.isStr(name, FilterTags.SUB)

            || SLDUtils.isStr(name, FilterTags.MUL)

            || SLDUtils.isStr(name, FilterTags.DIV)) {

            return ArithmeticElement.parse(parser, version);

        }

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

            return FunctionElement.parse(parser, version);

        }

        throw new SLDReadException("Unexpected entity in expression: " + name);

    }

}