/******************************************************************************* | |
* Copyright (c) 2011 IBM Corporation and others. | |
* All rights reserved. This program and the accompanying materials | |
* are made available under the terms of the Eclipse Public License v1.0 | |
* which accompanies this distribution, and is available at | |
* http://www.eclipse.org/legal/epl-v10.html | |
* | |
* Contributors: | |
* IBM Corporation - initial API and implementation | |
*******************************************************************************/ | |
package org.eclipse.wst.css.ui.internal.text.hover; | |
import java.io.IOException; | |
import java.net.URL; | |
import java.util.HashMap; | |
import java.util.Map; | |
import javax.xml.parsers.ParserConfigurationException; | |
import javax.xml.parsers.SAXParserFactory; | |
import org.eclipse.core.runtime.FileLocator; | |
import org.eclipse.core.runtime.Path; | |
import org.eclipse.swt.graphics.RGB; | |
import org.eclipse.wst.css.ui.internal.CSSUIPlugin; | |
import org.eclipse.wst.css.ui.internal.Logger; | |
import org.xml.sax.Attributes; | |
import org.xml.sax.InputSource; | |
import org.xml.sax.SAXException; | |
import org.xml.sax.XMLReader; | |
import org.xml.sax.helpers.DefaultHandler; | |
import com.ibm.icu.util.StringTokenizer; | |
/** | |
* Associates css color names to the appropriate {@link RGB} values. | |
* These associations are defined in org.eclipse.wst.css.ui/csscolors/extended-color-mapping.xml | |
* | |
*/ | |
class CSSColorNames { | |
private static CSSColorNames instance; | |
private static final Map colors = new HashMap(); | |
private CSSColorNames() { | |
try { | |
URL url = FileLocator.find(CSSUIPlugin.getDefault().getBundle(), new Path("csscolors/extended-color-mapping.xml"), null); //$NON-NLS-1$ | |
final XMLReader xmlReader = SAXParserFactory.newInstance().newSAXParser().getXMLReader(); | |
xmlReader.setContentHandler(new ColorMappingHandler()); | |
xmlReader.parse(new InputSource(url.openStream())); | |
} | |
catch (IOException e) { | |
Logger.logException(e); | |
} | |
catch (SAXException e) { | |
Logger.logException(e); | |
} | |
catch (ParserConfigurationException e) { | |
Logger.logException(e); | |
} | |
} | |
public static synchronized CSSColorNames getInstance() { | |
if (instance == null) { | |
instance = new CSSColorNames(); | |
} | |
return instance; | |
} | |
/** | |
* Returns the {@link RGB} value associated with this color name. | |
* @param name the color name | |
* @return {@link RGB} associated with <code>name</code>, null if it is an unknown name or invalid RGB value | |
*/ | |
public RGB getRGB(String name) { | |
return (RGB) colors.get(name); | |
} | |
class ColorMappingHandler extends DefaultHandler { | |
private final String COLOR_ELEM = "color"; //$NON-NLS-1$ | |
private final String NAME_ATTR = "name"; //$NON-NLS-1$ | |
private final String RGB_ATTR = "rgb"; //$NON-NLS-1$ | |
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { | |
if (COLOR_ELEM.equals(qName)) { | |
final String name = attributes.getValue(NAME_ATTR); | |
final String rgb = attributes.getValue(RGB_ATTR); | |
if (name != null && rgb != null) { | |
final RGB rgbValue = getRGB(rgb); | |
if (rgbValue != null) { | |
colors.put(name, rgbValue); | |
} | |
} | |
} | |
} | |
/** | |
* Converts an rgb string into an {@link RGB} | |
* @param rgb the color string | |
* @return an {@link RGB} if one can be created from the string; otherwise, null | |
*/ | |
private RGB getRGB(String rgb) { | |
final StringTokenizer tokenizer = new StringTokenizer(rgb, ","); //$NON-NLS-1$ | |
int[] weights = new int[3]; | |
for (int i = 0; tokenizer.hasMoreTokens(); i++) { | |
if (i > 2) | |
return null; | |
try { | |
weights[i] = Integer.parseInt(tokenizer.nextToken().trim()); | |
} | |
catch (NumberFormatException e) { | |
return null; | |
} | |
if (weights[i] > 255 || weights[i] < 0) | |
return null; | |
} | |
return new RGB(weights[0], weights[1], weights[2]); | |
} | |
} | |
} |