1 files changed, 46 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/timeline/Timelines.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/timeline/Timelines.java
new file mode 100644
index 00000000..747fda15
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/timeline/Timelines.java
@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2019, Tamas Szabo, itemis AG, Gabor Bergmann, IncQuery Labs Ltd.
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.matchers.util.timeline;
+
+import java.util.List;
+
+/**
+ * Utility class for creating {@link Timeline}s. 
+ * @author Tamas Szabo
+ * @since 2.4
+ */
+public final class Timelines<Timestamp extends Comparable<Timestamp>> {
+
+    public static <Timestamp extends Comparable<Timestamp>> Timeline<Timestamp> createEmpty() {
+        return new CompactTimeline<Timestamp>();
+    }
+    
+    public static <Timestamp extends Comparable<Timestamp>> Timeline<Timestamp> createFrom(
+            final Diff<Timestamp> diffs) {
+        if (diffs.size() == 1) {
+            return new SingletonTimeline<Timestamp>(diffs);
+        } else {
+            return new CompactTimeline<Timestamp>(diffs);
+        }
+    }
+
+    public static <Timestamp extends Comparable<Timestamp>> Timeline<Timestamp> createFrom(
+            final List<Timestamp> timestamps) {
+        if (timestamps.size() == 1) {
+            return new SingletonTimeline<Timestamp>(timestamps.get(0));
+        } else {
+            return new CompactTimeline<Timestamp>(timestamps);
+        }
+    }
+
+    public static <Timestamp extends Comparable<Timestamp>> Timeline<Timestamp> createFrom(final Timestamp timestamp) {
+        return new SingletonTimeline<Timestamp>(timestamp);
+    }
+
+}