/*******************************************************************************
* Copyright (c) 2008 Oracle Corporation.
* 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:
* Ian Trimble - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.css2.property;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.jst.pagedesigner.IHTMLConstants;
import org.eclipse.jst.pagedesigner.PDPlugin;
import org.eclipse.jst.pagedesigner.css2.ICSSStyle;
import org.eclipse.jst.pagedesigner.utils.DOMUtil;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Image;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;
import org.w3c.dom.Element;
import org.w3c.dom.css.CSSValue;
/**
* Provides metadata for the "background-image" CSS property.
*
* @author Ian Trimble - Oracle
*/
public class BackgroundImageMeta extends CSSPropertyMeta {
private static final String[] _keywords = {ICSSPropertyID.VAL_NONE};
/**
* Construct an instance.
*/
public BackgroundImageMeta() {
super(false, ICSSPropertyID.VAL_NONE);
}
/* (non-Javadoc)
* @see org.eclipse.jst.pagedesigner.css2.property.CSSPropertyMeta#calculateCSSValueResult(org.w3c.dom.css.CSSValue, java.lang.String, org.eclipse.jst.pagedesigner.css2.ICSSStyle)
*/
@Override
public Object calculateCSSValueResult(CSSValue value, String propertyName,
ICSSStyle style) {
Object ret = null;
String valueText = value.getCssText();
if (valueText != null && valueText.length() > 0) {
valueText = stripURLSyntax(valueText);
ret = getImage(valueText, null);
}
if (ret == null) {
ret = getInitialValue(propertyName, style);
}
return ret;
}
/* (non-Javadoc)
* @see org.eclipse.jst.pagedesigner.css2.property.CSSPropertyMeta#calculateHTMLAttributeOverride(org.w3c.dom.Element, java.lang.String, java.lang.String, org.eclipse.jst.pagedesigner.css2.ICSSStyle)
*/
@Override
public Object calculateHTMLAttributeOverride(Element element,
String htmltag, String propertyName, ICSSStyle style) {
Image image = null;
if (
element != null &&
element.getNodeName() != null &&
element.getNodeName().equalsIgnoreCase(IHTMLConstants.TAG_BODY)) {
if (ICSSPropertyID.ATTR_BACKGROUND_IMAGE.equalsIgnoreCase(propertyName)) {
String attrValue = DOMUtil.getAttributeIgnoreCase(element, IHTMLConstants.ATTR_BACKGROUND);
if (attrValue != null && attrValue.trim().length() > 0) {
image = getImage(attrValue.trim(), element);
}
}
}
return image;
}
/* (non-Javadoc)
* @see org.eclipse.jst.pagedesigner.css2.property.CSSPropertyMeta#getKeywordValues()
*/
@Override
protected String[] getKeywordValues() {
return _keywords;
}
private String stripURLSyntax(String input) {
String output = null;
if (input != null) {
//strip "url(...)"
int startPos = input.indexOf("url(") + 4; //$NON-NLS-1$
if (startPos > -1 && startPos < input.length() - 1) {
int endPos = input.indexOf(')', startPos);
if (endPos > startPos) {
String insideURL = input.substring(startPos, endPos).trim();
//strip double-quotes
if (insideURL.startsWith("\"") && insideURL.endsWith("\"")) { //$NON-NLS-1$ //$NON-NLS-2$
output = insideURL.substring(1, insideURL.length() - 1);
//strip single-quotes
} else if (insideURL.startsWith("'") && insideURL.endsWith("'")) { //$NON-NLS-1$ //$NON-NLS-2$
output = insideURL.substring(1, insideURL.length() - 1);
} else {
output = insideURL;
}
}
}
}
return output != null ? output : input;
}
/* Image instances returned from this method should not be disposed because
* they are cached in the plug-in's ImageRegistry and will be disposed of
* by the registry.
*/
private Image getImage(String imagePath, Element element) {
Image image = null;
if (imagePath != null && imagePath.length() > 0) {
ImageRegistry registry = PDPlugin.getDefault().getImageRegistry();
image = registry.get(imagePath);
if (image == null) {
try {
URL imageURL = new URL(imagePath);
ImageDescriptor imageDescriptor = ImageDescriptor.createFromURL(imageURL);
image = imageDescriptor.createImage();
if (image != null) {
registry.put(imagePath, image);
}
} catch(MalformedURLException mue) {
//attempt to resolve as relative to document
if (element instanceof IDOMNode) {
IDOMModel model = ((IDOMNode)element).getModel();
if (model != null) {
String baseLocation = model.getBaseLocation();
if (baseLocation != null && baseLocation.length() > 0) {
IWorkspaceRoot wsRoot = ResourcesPlugin.getWorkspace().getRoot();
if (wsRoot != null) {
IResource jspRes = wsRoot.findMember(baseLocation);
if (jspRes != null) {
IContainer jspFolder = jspRes.getParent();
if (jspFolder != null) {
IResource imageRes = jspFolder.findMember(imagePath);
if (imageRes != null) {
URI imageURI = imageRes.getLocationURI();
if (imageURI != null) {
try {
URL imageURL = imageURI.toURL();
ImageDescriptor imageDescriptor = ImageDescriptor.createFromURL(imageURL);
image = imageDescriptor.createImage();
if (image != null) {
registry.put(imagePath, image);
}
} catch(MalformedURLException mue2) {
//ignore - what else can be done?
}
}
}
}
}
}
}
}
}
} catch(SWTException swtEx) {
/*
* We're probably trying to create an image from a valid URL to an invalid
* resource (such as a URL to a folder or to a file that is not an image file);
* ignoring the exception will result in a return of null, which is what we want
* in this case.
*/
}
} else if (image.isDisposed()) {
//shouldn't be able to get here from there, but...just in case
registry.remove(imagePath);
image = getImage(imagePath, element);
}
}
return image;
}
}