/* (c) 2014 - 2015 Open Source Geospatial Foundation - all rights reserved
* (c) 2001 - 2013 OpenPlans
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.geoserver.community.css.web;
import java.awt.Color;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.geoserver.catalog.SLDHandler;
import org.geoserver.catalog.StyleHandler;
import org.geoserver.catalog.StyleType;
import org.geoserver.catalog.Styles;
import org.geoserver.platform.resource.FileSystemResourceStore;
import org.geoserver.platform.resource.Resource;
import org.geotools.styling.ResourceLocator;
import org.geotools.styling.Style;
import org.geotools.styling.StyledLayerDescriptor;
import org.geotools.styling.css.CssParser;
import org.geotools.styling.css.CssTranslator;
import org.geotools.styling.css.Stylesheet;
import org.geotools.util.Version;
import org.xml.sax.EntityResolver;
/**
* Style handler for geocss. Justin Deoliveira, Boundless
*/
public class CssHandler extends StyleHandler {
public static final String FORMAT = "css";
public static final String MIME_TYPE = "application/vnd.geoserver.geocss+css";
static final Map<StyleType, String> TEMPLATES = new HashMap<StyleType, String>();
static {
try {
TEMPLATES.put(StyleType.POINT, IOUtils.toString(CssHandler.class
.getResourceAsStream("template_point.css")));
TEMPLATES.put(StyleType.POLYGON, IOUtils.toString(CssHandler.class
.getResourceAsStream("template_polygon.css")));
TEMPLATES.put(StyleType.LINE, IOUtils.toString(CssHandler.class
.getResourceAsStream("template_line.css")));
TEMPLATES.put(StyleType.RASTER, IOUtils.toString(CssHandler.class
.getResourceAsStream("template_raster.css")));
TEMPLATES.put(StyleType.GENERIC, IOUtils.toString(CssHandler.class
.getResourceAsStream("template_generic.css")));
} catch (IOException e) {
throw new RuntimeException("Error loading up the css style templates", e);
}
}
private SLDHandler sldHandler;
protected CssHandler(SLDHandler sldHandler) {
super("CSS", FORMAT);
this.sldHandler = sldHandler;
}
@Override
public String getStyle(StyleType type, Color color, String colorName, String layerName) {
String template = TEMPLATES.get(type);
String colorCode = Integer.toHexString(color.getRGB());
colorCode = colorCode.substring(2, colorCode.length());
return template.replace("${colorName}", colorName).replace(
"${colorCode}", "#" + colorCode).replace("${layerName}", layerName);
}
@Override
public String mimeType(Version version) {
return MIME_TYPE;
}
@Override
public StyledLayerDescriptor parse(Object input, Version version,
ResourceLocator resourceLocator, EntityResolver entityResolver) throws IOException {
// see if we can use the SLD cache, some conversions are expensive.
if (input instanceof File) {
// convert to resource, to avoid code duplication (the code for file would be very
// similar to the resource one, but unfortunately using an unrelated set of classes
File cssFile = (File) input;
input = new FileSystemResourceStore(cssFile.getParentFile()).get(cssFile.getName());
}
if (input instanceof Resource) {
Resource cssResource = (Resource) input;
Resource sldResource = cssResource.parent().get(
FilenameUtils.getBaseName(cssResource.name()) + ".sld");
if (sldResource.getType() != Resource.Type.UNDEFINED
&& sldResource.lastmodified() > cssResource.lastmodified()) {
return sldHandler.parse(sldResource, SLDHandler.VERSION_10, resourceLocator,
entityResolver);
} else {
// otherwise convert and write the cache
try(Reader reader = toReader(input)) {
StyledLayerDescriptor sld = convertToSLD(reader);
try (OutputStream fos = sldResource.out()) {
sldHandler.encode(sld, SLDHandler.VERSION_10, true, fos);
}
// be consistent, have the SLD always be generated from and SLD parse,
// different code paths could result in different defaults/results due
// to inconsistencies/bugs happening over time
return sldHandler.parse(sldResource, SLDHandler.VERSION_10, resourceLocator,
entityResolver);
}
}
}
// in this case, just do a plain on the fly conversion
try (Reader reader = toReader(input)) {
StyledLayerDescriptor sld = convertToSLD(toReader(input));
return sld;
}
}
StyledLayerDescriptor convertToSLD(String css) throws IOException {
return convertToSLD(new StringReader(css));
}
private StyledLayerDescriptor convertToSLD(Reader cssReader) throws IOException {
Stylesheet styleSheet = CssParser.parse(IOUtils.toString(cssReader));
Style style = (Style) new CssTranslator().translate(styleSheet);
StyledLayerDescriptor sld = Styles.sld(style);
return sld;
}
@Override
public void encode(StyledLayerDescriptor sld, Version version, boolean pretty,
OutputStream output) throws IOException {
throw new UnsupportedOperationException();
}
@Override
public List<Exception> validate(Object input, Version version, EntityResolver entityResolver)
throws IOException {
try (Reader reader = toReader(input)) {
// full parse to perform the validation
convertToSLD(toReader(input));
return Collections.emptyList();
} catch (Exception e) {
return Arrays.asList(e);
}
}
@Override
public String getCodeMirrorEditMode() {
return "text/geocss";
}
}