/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. 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:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.utils;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLDecoder;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Image;
import org.eclipse.wst.sse.core.internal.util.URIResolver;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;
import org.w3c.dom.Element;
/**
* @author mengbo
* @version 1.5
*/
public class ImageResolver {
/**
*
* @param element
* @param attrName
* @return
*/
static String getResolvedURL(Element element, String attrName) {
URIResolver resolver = null;
if (element instanceof IDOMNode) {
resolver = ((IDOMNode) element).getModel().getResolver();
}
if (null == resolver) {
return null;
}
String src = DOMUtil.getAttributeIgnoreCase(element, attrName);
if (src != null && src.length() > 0) {
return resolver.getLocationByURI(src);
}
return null;
}
/**
* given the element and an attribute name identifying the src of the image,
* create a image.
*
* @param element
* @param attrName
* @return the new image
*/
public static Image initializeImage(Element element, String attrName) {
String url = getResolvedURL(element, attrName);
if (url == null) {
return null;
}
//Bug 307801 - [WPE] WPE does not render Images with URL encoding in their path in the preview pane
try {
url = URLDecoder.decode(url, "UTF-8"); //$NON-NLS-1$
} catch(UnsupportedEncodingException uee) {
//we tried to decode using recommended encoding, we failed
} catch(IllegalArgumentException iae) {
//we tried to decode using recommended encoding, we failed
}
Image img = null;
int colonIndex = url.indexOf(":"); //$NON-NLS-1$
int slashIndex = url.indexOf("/"); //$NON-NLS-1$
if (colonIndex != -1 && (slashIndex != -1 && colonIndex < slashIndex)) {
//the url seems to have a protocol, so try to load it as a URL
try {
URL urlObj = new URL(url);
ImageDescriptor imgDesc = ImageDescriptor.createFromURL(urlObj);
img = imgDesc.createImage(false);
} catch(MalformedURLException mfe) {
//attempt to load as a file
try {
img = new Image(null, url);
} catch(SWTException se) {
//img remains null on return
}
} catch(SWTException se) {
//img remains null on return
}
} else {
//no protocol, so load it as a file
try {
img = new Image(null, url);
} catch(SWTException se) {
//img remains null on return
}
}
return img;
}
}