/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*/
package org.geotools.styling;
import org.opengis.filter.expression.VolatileFunction;
/**
* A simple visitor whose purpose is to extract the set of attributes used by a
* Style, that is, those that the Style expects to find in order to work
* properly
*
* This is very similiar to StyleAttributeExtractor, but with these differences:
* a) it doesnt the count the <PropertyName> tag in the <Geometry> b) it doesnt
* count anything in the <TextSymbolizer>'s <Priority> tag c) it doesnt count
* anything in the <TextSymbolizer>'s <Label> tag
*
* The reasons for this are because these fields are ALWAYS taken directly from
* the feature, not from the style.
*
* So, for making queries (knowing any property that might be possibily be used
* in the SLD), use StyleAttributeExtractor. If you want to know what a
* symbolizer actually needs to cache, then use this
* (StyleAttributeExtractorTruncated).
*
* @author dblasby
*
* @source $URL$
*/
public class StyleAttributeExtractorTruncated extends StyleAttributeExtractor
implements StyleVisitor {
boolean usingVolatileFunctions = false;
@Override
public void clear() {
super.clear();
usingVolatileFunctions = false;
}
public boolean isUsingVolatileFunctions() {
return usingVolatileFunctions;
}
public Object visit(org.opengis.filter.expression.Function expression, Object data) {
usingVolatileFunctions |= (expression instanceof VolatileFunction);
return super.visit(expression, data);
};
public void visit(RasterSymbolizer rs) {
if (rs != null) {
if (rs.getImageOutline() != null) {
rs.getImageOutline().accept(this);
}
if (rs.getOpacity() != null) {
rs.getOpacity().accept(this, null);
}
}
}
/**
* @see org.geotools.styling.StyleVisitor#visit(org.geotools.styling.PointSymbolizer)
*/
public void visit(PointSymbolizer ps) {
if (ps.getGraphic() != null) {
ps.getGraphic().accept(this);
}
}
/**
* @see org.geotools.styling.StyleVisitor#visit(org.geotools.styling.LineSymbolizer)
*/
public void visit(LineSymbolizer line) {
if (line.getStroke() != null) {
line.getStroke().accept(this);
}
}
/**
* @see org.geotools.styling.StyleVisitor#visit(org.geotools.styling.PolygonSymbolizer)
*/
public void visit(PolygonSymbolizer poly) {
if (poly.getStroke() != null) {
poly.getStroke().accept(this);
}
if (poly.getFill() != null) {
poly.getFill().accept(this);
}
}
/**
* @see org.geotools.styling.StyleVisitor#visit(org.geotools.styling.TextSymbolizer)
*/
public void visit(TextSymbolizer text) {
if (text instanceof TextSymbolizer2) {
if (((TextSymbolizer2) text).getGraphic() != null)
((TextSymbolizer2) text).getGraphic().accept(this);
}
if (text.getFill() != null) {
text.getFill().accept(this);
}
if (text.getHalo() != null) {
text.getHalo().accept(this);
}
if (text.getFonts() != null) {
Font[] fonts = text.getFonts();
for (int i = 0; i < fonts.length; i++) {
Font font = fonts[i];
if (font.getFontFamily() != null) {
font.getFontFamily().accept(this, null);
}
if (font.getFontSize() != null) {
font.getFontSize().accept(this, null);
}
if (font.getFontStyle() != null) {
font.getFontStyle().accept(this, null);
}
if (font.getFontWeight() != null) {
font.getFontWeight().accept(this, null);
}
}
}
if (text.getHalo() != null) {
text.getHalo().accept(this);
}
if (text.getPlacement() != null) {
text.getPlacement().accept(this);
}
}
}