--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface/src/org/eclipse/jface/viewers/ViewerFilter.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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 org.eclipse.jface.viewers.ViewerFilter;
+
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.jface.viewers.TreePath;
+
+
+import java.lang.all;
+import java.util.ArrayList;
+import java.util.Set;
+
+/**
+ * A viewer filter is used by a structured viewer to
+ * extract a subset of elements provided by its content provider.
+ * <p>
+ * Subclasses must implement the <code>select</code> method
+ * and may implement the <code>isFilterProperty</code> method.
+ * </p>
+ * @see IStructuredContentProvider
+ * @see StructuredViewer
+ */
+public abstract class ViewerFilter {
+    /**
+     * Creates a new viewer filter.
+     */
+    protected this() {
+    }
+
+    /**
+     * Filters the given elements for the given viewer.
+     * The input array is not modified.
+     * <p>
+     * The default implementation of this method calls
+     * <code>select</code> on each element in the array,
+     * and returns only those elements for which <code>select</code>
+     * returns <code>true</code>.
+     * </p>
+     * @param viewer the viewer
+     * @param parent the parent element
+     * @param elements the elements to filter
+     * @return the filtered elements
+     */
+    public Object[] filter(Viewer viewer, Object parent, Object[] elements) {
+        int size = elements.length;
+        ArrayList out_ = new ArrayList(size);
+        for (int i = 0; i < size; ++i) {
+            Object element = elements[i];
+            if (select(viewer, parent, element)) {
+                out_.add(element);
+            }
+        }
+        return out_.toArray();
+    }
+
+    /**
+     * Filters the given elements for the given viewer.
+     * The input array is not modified.
+     * <p>
+     * The default implementation of this method calls
+     * {@link #filter(Viewer, Object, Object[])} with the
+     * parent from the path. Subclasses may override
+     * </p>
+     * @param viewer the viewer
+     * @param parentPath the path of the parent element
+     * @param elements the elements to filter
+     * @return the filtered elements
+     * @since 3.2
+     */
+    public Object[] filter(Viewer viewer, TreePath parentPath, Object[] elements) {
+        return filter(viewer, parentPath.getLastSegment(), elements);
+    }
+
+    /**
+     * Returns whether this viewer filter would be affected
+     * by a change to the given property of the given element.
+     * <p>
+     * The default implementation of this method returns <code>false</code>.
+     * Subclasses should reimplement.
+     * </p>
+     *
+     * @param element the element
+     * @param property the property
+     * @return <code>true</code> if the filtering would be affected,
+     *    and <code>false</code> if it would be unaffected
+     */
+    public bool isFilterProperty(Object element, String property) {
+        return false;
+    }
+
+    /**
+     * Returns whether the given element makes it through this filter.
+     *
+     * @param viewer the viewer
+     * @param parentElement the parent element
+     * @param element the element
+     * @return <code>true</code> if element is included in the
+     *   filtered set, and <code>false</code> if excluded
+     */
+    public abstract bool select(Viewer viewer, Object parentElement,
+            Object element);
+}