| package org.eclipse.jst.jsf.ui.internal.jspeditor; |
| |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.Region; |
| import org.eclipse.jst.jsf.context.resolver.structureddocument.IStructuredDocumentContextResolverFactory; |
| import org.eclipse.jst.jsf.context.resolver.structureddocument.internal.ITextRegionContextResolver; |
| import org.eclipse.jst.jsf.context.structureddocument.IStructuredDocumentContext; |
| import org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser; |
| import org.eclipse.jst.jsf.core.internal.contentassist.el.SymbolInfo; |
| import org.eclipse.jst.jsf.designtime.DTAppManagerUtil; |
| import org.eclipse.jst.jsf.designtime.internal.view.XMLViewDefnAdapter; |
| import org.eclipse.jst.jsf.designtime.internal.view.IDTViewHandler.ViewHandlerException; |
| import org.eclipse.jst.jsf.designtime.internal.view.XMLViewDefnAdapter.DTELExpression; |
| import org.eclipse.jst.jsf.ui.internal.JSFUiPlugin; |
| import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext; |
| |
| /** |
| * Utility class to access EL symbols in jsp file. |
| */ |
| public final class JSPSourceUtil |
| { |
| |
| private JSPSourceUtil() |
| { |
| // utility class, no instances. |
| } |
| |
| /** |
| * Find the Region |
| * |
| * @param context - |
| * the IStructuredDocumentContext |
| * @return region of el expression, null if context doesn't point to an el |
| * expression |
| */ |
| public static Region findELRegion(final IStructuredDocumentContext context) |
| { |
| if (context != null) |
| { |
| final XMLViewDefnAdapter adapter = |
| DTAppManagerUtil.getXMLViewDefnAdapter(context); |
| if (adapter != null) |
| { |
| DTELExpression expression; |
| try |
| { |
| expression = adapter.getELExpression(context); |
| } |
| catch (ViewHandlerException e) |
| { |
| JSFUiPlugin.log(IStatus.ERROR, "", e); |
| expression = null; |
| } |
| |
| if (expression != null) |
| { |
| final ITextRegionContextResolver resolver = |
| IStructuredDocumentContextResolverFactory.INSTANCE |
| .getTextRegionResolver(expression |
| .getDocumentContext()); |
| |
| if (resolver != null) |
| { |
| final String regionType = resolver.getRegionType(); |
| |
| if (regionType != null |
| && resolver.matchesRelative(new String[] |
| { DOMRegionContext.XML_TAG_ATTRIBUTE_VALUE })) |
| { |
| return new Region(resolver.getStartOffset(), |
| resolver.getLength()); |
| } |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Determines symbol and symbol region at a given document position |
| * |
| * @param context - |
| * the IStructuredDocumentContext |
| * @param elRegion - |
| * the region of the el expression to consider |
| * @param documentPosition - |
| * the document position to get the symbol for |
| * @return SymbolInfo |
| */ |
| public static SymbolInfo determineSymbolInfo( |
| final IStructuredDocumentContext context, final Region elRegion, |
| final int documentPosition) |
| { |
| if (context != null && elRegion != null) |
| { |
| try |
| { |
| String elText; |
| elText = |
| context.getStructuredDocument().get( |
| elRegion.getOffset(), elRegion.getLength()); |
| final SymbolInfo symbolInfo = |
| ContentAssistParser.getSymbolInfo(context, |
| documentPosition - elRegion.getOffset() + 1, |
| elText); |
| return symbolInfo; |
| } |
| catch (final BadLocationException e) |
| { |
| // well, so we simply have no symbol, no reason to worry (or |
| // log...) |
| return null; |
| } |
| } |
| return null; |
| } |
| } |