| /******************************************************************************* |
| * Copyright (c) 2010 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.sse.ui.internal.contentassist; |
| |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.contentassist.IContextInformation; |
| import org.eclipse.jface.text.contentassist.IContextInformationValidator; |
| import org.eclipse.wst.sse.core.StructuredModelManager; |
| import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel; |
| import org.eclipse.wst.sse.core.internal.provisional.IndexedRegion; |
| import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument; |
| |
| /** |
| * <p>A {@link IContextInformationValidator} for structured documents</p> |
| */ |
| public class ContextInformationValidator implements IContextInformationValidator { |
| |
| /** the installed document position */ |
| private int fDocumentPosition; |
| |
| /** the installed document */ |
| private IStructuredDocument fDocument; |
| |
| /** the installed region start*/ |
| private IndexedRegion fRegion; |
| |
| /** |
| * <p>Default constructor</p> |
| */ |
| public ContextInformationValidator() { |
| fDocumentPosition = -1; |
| fDocument = null; |
| } |
| |
| /** |
| * @see org.eclipse.jface.text.contentassist.IContextInformationValidator#install(org.eclipse.jface.text.contentassist.IContextInformation, |
| * org.eclipse.jface.text.ITextViewer, int) |
| */ |
| public void install(IContextInformation info, ITextViewer viewer, int documentPosition) { |
| fDocumentPosition = documentPosition; |
| fDocument = (IStructuredDocument)viewer.getDocument(); |
| } |
| |
| /** |
| * @see org.eclipse.jface.text.contentassist.IContextInformationValidator#isContextInformationValid(int) |
| */ |
| public boolean isContextInformationValid(int documentPosition) { |
| /* |
| * determine whether or not this context info should still be |
| * showing... if cursor still within the same region then it's valid |
| */ |
| boolean result = false; |
| |
| calculateInstalledIndexedRegion(); |
| |
| if (fRegion != null) { |
| int start = fRegion.getStartOffset(); |
| int end = fRegion.getEndOffset(); |
| result = (documentPosition < end) && (documentPosition > start + 1); |
| } |
| return result; |
| } |
| |
| /** |
| * @return {@link IndexedRegion} that this validator was installed on |
| */ |
| private void calculateInstalledIndexedRegion() { |
| if (fRegion == null) { |
| IStructuredModel model = null; |
| try { |
| model = StructuredModelManager.getModelManager().getModelForRead(fDocument); |
| if (model != null) { |
| fRegion = model.getIndexedRegion(fDocumentPosition); |
| } |
| } |
| finally { |
| if (model != null) |
| model.releaseFromRead(); |
| } |
| } |
| } |
| } |