1 files changed, 85 insertions, 0 deletions
diff --git a/dsf-gdb/org.eclipse.cdt.dsf.gdb.ui/src/org/eclipse/cdt/dsf/gdb/internal/ui/debugsources/DebugSourcesViewComparator.java b/dsf-gdb/org.eclipse.cdt.dsf.gdb.ui/src/org/eclipse/cdt/dsf/gdb/internal/ui/debugsources/DebugSourcesViewComparator.java
new file mode 100644
index 00000000000..d3ce28b851f
--- /dev/null
+++ b/dsf-gdb/org.eclipse.cdt.dsf.gdb.ui/src/org/eclipse/cdt/dsf/gdb/internal/ui/debugsources/DebugSourcesViewComparator.java
@@ -0,0 +1,85 @@
+/*******************************************************************************
+ * Copyright (c) 2018, 2019 Kichwa Coders Ltd and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ * Baha El-Kassaby - Initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.dsf.gdb.internal.ui.debugsources;
+
+import java.util.function.Function;
+
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.jface.viewers.ViewerComparator;
+import org.eclipse.swt.SWT;
+
+/**
+ * Comparator used for the Debug Sources Table viewer
+ *
+ */
+public class DebugSourcesViewComparator<T> extends ViewerComparator {
+
+	private Function<T, Comparable<?>> func;
+
+	private int propertyIndex;
+
+	private enum Direction {
+		ASCENDING, DESCENDING;
+
+		/**
+		 *
+		 * @param direction the previous direction
+		 * @return the new direction
+		 */
+		public static Direction toggle(Direction direction) {
+			return direction == ASCENDING ? DESCENDING : ASCENDING;
+		}
+	}
+
+	private Direction direction = Direction.DESCENDING;
+
+	public DebugSourcesViewComparator(Function<T, Comparable<?>> func) {
+		this.func = func;
+	}
+
+	public DebugSourcesViewComparator() {
+		this.propertyIndex = 0;
+		direction = Direction.DESCENDING;
+	}
+
+	public int getDirection() {
+		return direction == Direction.DESCENDING ? SWT.DOWN : SWT.UP;
+	}
+
+	public void setColumn(Function<T, Comparable<?>> column, int idx) {
+		this.func = column;
+		if (idx == this.propertyIndex) {
+			// Same column as last sort; toggle the direction
+			direction = Direction.toggle(direction);
+		} else {
+			// New column
+			this.propertyIndex = idx;
+			direction = Direction.DESCENDING;
+		}
+	}
+
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	@Override
+	public int compare(Viewer viewer, Object e1, Object e2) {
+		Comparable s1 = func.apply((T) e1);
+		Comparable s2 = func.apply((T) e2);
+		int rc = s1.compareTo(s2);
+		// If descending order, flip the direction
+		if (direction.equals(Direction.DESCENDING)) {
+			rc = -rc;
+		}
+		return rc;
+	}
+
+}