org.eclipse.jst.pagedesigner/src/org/eclipse/jst/pagedesigner/css2/property/BackgroundImageMeta.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2008 Oracle Corporation.\r
   3  * All rights reserved. This program and the accompanying materials\r
   4  * are made available under the terms of the Eclipse Public License v1.0\r
   5  * which accompanies this distribution, and is available at\r
   6  * http://www.eclipse.org/legal/epl-v10.html\r
   7  *\r
   8  * Contributors:\r
   9  *    Ian Trimble - initial API and implementation\r
  10  *******************************************************************************/ \r
  11 package org.eclipse.jst.pagedesigner.css2.property;\r
  12 \r
  13 import java.net.MalformedURLException;\r
  14 import java.net.URI;\r
  15 import java.net.URL;\r
  16 \r
  17 import org.eclipse.core.resources.IContainer;\r
  18 import org.eclipse.core.resources.IResource;\r
  19 import org.eclipse.core.resources.IWorkspaceRoot;\r
  20 import org.eclipse.core.resources.ResourcesPlugin;\r
  21 import org.eclipse.jface.resource.ImageDescriptor;\r
  22 import org.eclipse.jface.resource.ImageRegistry;\r
  23 import org.eclipse.jst.pagedesigner.IHTMLConstants;\r
  24 import org.eclipse.jst.pagedesigner.PDPlugin;\r
  25 import org.eclipse.jst.pagedesigner.css2.ICSSStyle;\r
  26 import org.eclipse.jst.pagedesigner.utils.DOMUtil;\r
  27 import org.eclipse.swt.graphics.Image;\r
  28 import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;\r
  29 import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;\r
  30 import org.w3c.dom.Element;\r
  31 import org.w3c.dom.css.CSSValue;\r
  32 \r
  33 /**\r
  34  * Provides metadata for the "background-image" CSS property.\r
  35  * \r
  36  * @author Ian Trimble - Oracle\r
  37  */\r
  38 public class BackgroundImageMeta extends CSSPropertyMeta {\r
  39 \r
  40         private static final String[] _keywords = {ICSSPropertyID.VAL_NONE};\r
  41 \r
  42         /**\r
  43          * Construct an instance.\r
  44          */\r
  45         public BackgroundImageMeta() {\r
  46                 super(false, ICSSPropertyID.VAL_NONE);\r
  47         }\r
  48 \r
  49         /* (non-Javadoc)\r
  50          * @see org.eclipse.jst.pagedesigner.css2.property.CSSPropertyMeta#calculateCSSValueResult(org.w3c.dom.css.CSSValue, java.lang.String, org.eclipse.jst.pagedesigner.css2.ICSSStyle)\r
  51          */\r
  52         @Override\r
  53         public Object calculateCSSValueResult(CSSValue value, String propertyName,\r
  54                         ICSSStyle style) {\r
  55                 Object ret = null;\r
  56                 String valueText = value.getCssText();\r
  57                 if (valueText != null && valueText.length() > 0) {\r
  58                         valueText = stripURLSyntax(valueText);\r
  59                         ret = getImage(valueText, null);\r
  60                 }\r
  61                 if (ret == null) {\r
  62                         ret = getInitialValue(propertyName, style);\r
  63                 }\r
  64                 return ret;\r
  65         }\r
  66 \r
  67         /* (non-Javadoc)\r
  68          * @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)\r
  69          */\r
  70         @Override\r
  71         public Object calculateHTMLAttributeOverride(Element element,\r
  72                         String htmltag, String propertyName, ICSSStyle style) {\r
  73                 Image image = null;\r
  74                 if (\r
  75                                 element != null &&\r
  76                                 element.getNodeName() != null &&\r
  77                                 element.getNodeName().equalsIgnoreCase(IHTMLConstants.TAG_BODY)) {\r
  78                         if (ICSSPropertyID.ATTR_BACKGROUND_IMAGE.equalsIgnoreCase(propertyName)) {\r
  79                                 String attrValue = DOMUtil.getAttributeIgnoreCase(element, IHTMLConstants.ATTR_BACKGROUND);\r
  80                                 if (attrValue != null && attrValue.trim().length() > 0) {\r
  81                                         image = getImage(attrValue.trim(), element);\r
  82                                 }\r
  83                         }\r
  84                 }\r
  85                 return image;\r
  86         }\r
  87 \r
  88         /* (non-Javadoc)\r
  89          * @see org.eclipse.jst.pagedesigner.css2.property.CSSPropertyMeta#getKeywordValues()\r
  90          */\r
  91         @Override\r
  92         protected String[] getKeywordValues() {\r
  93                 return _keywords;\r
  94         }\r
  95 \r
  96         private String stripURLSyntax(String input) {\r
  97                 String output = null;\r
  98                 if (input != null) {\r
  99                         //strip "url(...)"\r
 100                         int startPos = input.indexOf("url(") + 4; //$NON-NLS-1$\r
 101                         if (startPos > -1 && startPos < input.length() - 1) {\r
 102                                 int endPos = input.indexOf(')', startPos);\r
 103                                 if (endPos > startPos) {\r
 104                                         String insideURL = input.substring(startPos, endPos).trim();\r
 105                                         //strip double-quotes\r
 106                                         if (insideURL.startsWith("\"") && insideURL.endsWith("\"")) { //$NON-NLS-1$ //$NON-NLS-2$\r
 107                                                 output = insideURL.substring(1, insideURL.length() - 1);\r
 108                                         //strip single-quotes\r
 109                                         } else if (insideURL.startsWith("'") && insideURL.endsWith("'")) { //$NON-NLS-1$ //$NON-NLS-2$\r
 110                                                 output = insideURL.substring(1, insideURL.length() - 1);\r
 111                                         } else {\r
 112                                                 output = insideURL;\r
 113                                         }\r
 114                                 }\r
 115                         }\r
 116                 }\r
 117                 return output != null ? output : input;\r
 118         }\r
 119 \r
 120         /* Image instances returned from this method should not be disposed because\r
 121          * they are cached in the plug-in's ImageRegistry and will be disposed of\r
 122          * by the registry.\r
 123          */\r
 124         private Image getImage(String imagePath, Element element) {\r
 125                 Image image = null;\r
 126                 if (imagePath != null && imagePath.length() > 0) {\r
 127                         ImageRegistry registry = PDPlugin.getDefault().getImageRegistry();\r
 128                         image = registry.get(imagePath);\r
 129                         if (image == null) {\r
 130                                 try {\r
 131                                         URL imageURL = new URL(imagePath);\r
 132                                         ImageDescriptor imageDescriptor = ImageDescriptor.createFromURL(imageURL);\r
 133                                         image = imageDescriptor.createImage();\r
 134                                         if (image != null) {\r
 135                                                 registry.put(imagePath, image);\r
 136                                         }\r
 137                                 } catch(MalformedURLException mue) {\r
 138                                         //attempt to resolve as relative to document\r
 139                                         if (element instanceof IDOMNode) {\r
 140                                                 IDOMModel model = ((IDOMNode)element).getModel();\r
 141                                                 if (model != null) {\r
 142                                                         String baseLocation = model.getBaseLocation();\r
 143                                                         if (baseLocation != null && baseLocation.length() > 0) {\r
 144                                                                 IWorkspaceRoot wsRoot = ResourcesPlugin.getWorkspace().getRoot();\r
 145                                                                 if (wsRoot != null) {\r
 146                                                                         IResource jspRes = wsRoot.findMember(baseLocation);\r
 147                                                                         if (jspRes != null) {\r
 148                                                                                 IContainer jspFolder = jspRes.getParent();\r
 149                                                                                 if (jspFolder != null) {\r
 150                                                                                         IResource imageRes = jspFolder.findMember(imagePath);\r
 151                                                                                         if (imageRes != null) {\r
 152                                                                                                 URI imageURI = imageRes.getLocationURI();\r
 153                                                                                                 if (imageURI != null) {\r
 154                                                                                                         try {\r
 155                                                                                                                 URL imageURL = imageURI.toURL();\r
 156                                                                                                                 ImageDescriptor imageDescriptor = ImageDescriptor.createFromURL(imageURL);\r
 157                                                                                                                 image = imageDescriptor.createImage();\r
 158                                                                                                                 if (image != null) {\r
 159                                                                                                                         registry.put(imagePath, image);\r
 160                                                                                                                 }\r
 161                                                                                                         } catch(MalformedURLException mue2) {\r
 162                                                                                                                 //ignore - what else can be done?\r
 163                                                                                                         }\r
 164                                                                                                 }\r
 165                                                                                         }\r
 166                                                                                 }\r
 167                                                                         }\r
 168                                                                 }\r
 169                                                         }\r
 170                                                 }\r
 171                                         }\r
 172                                 }\r
 173                         } else if (image.isDisposed()) {\r
 174                                 //shouldn't be able to get here from there, but...just in case\r
 175                                 registry.remove(imagePath);\r
 176                                 image = getImage(imagePath, element);\r
 177                         }\r
 178                 }\r
 179                 return image;\r
 180         }\r
 181 \r
 182 }\r