--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/contentassist/ContextInformationValidator.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,66 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.contentassist.ContextInformationValidator;
+
+import dwt.dwthelper.utils;
+
+import dwtx.jface.text.ITextViewer;
+
+
+/**
+ * A default implementation of the <code>IContextInfomationValidator</code> interface.
+ * This implementation determines whether the information is valid by asking the content
+ * assist processor for all  context information objects for the current position. If the
+ * currently displayed information is in the result set, the context information is
+ * considered valid.
+ */
+public final class ContextInformationValidator : IContextInformationValidator {
+
+    /** The content assist processor. */
+    private IContentAssistProcessor fProcessor;
+    /** The context information to be validated. */
+    private IContextInformation fContextInformation;
+    /** The associated text viewer. */
+    private ITextViewer fViewer;
+
+    /**
+     * Creates a new context information validator which is ready to be installed on
+     * a particular context information.
+     *
+     * @param processor the processor to be used for validation
+     */
+    public ContextInformationValidator(IContentAssistProcessor processor) {
+        fProcessor= processor;
+    }
+
+    /*
+     * @see IContextInformationValidator#install(IContextInformation, ITextViewer, int)
+     */
+    public void install(IContextInformation contextInformation, ITextViewer viewer, int offset) {
+        fContextInformation= contextInformation;
+        fViewer= viewer;
+    }
+
+    /*
+     * @see IContentAssistTipCloser#isContextInformationValid(int)
+     */
+    public bool isContextInformationValid(int offset) {
+        IContextInformation[] infos= fProcessor.computeContextInformation(fViewer, offset);
+        if (infos !is null && infos.length > 0) {
+            for (int i= 0; i < infos.length; i++)
+                if (fContextInformation.equals(infos[i]))
+                    return true;
+        }
+        return false;
+    }
+}