1 files changed, 29 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/SingletonInstanceProvider.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/SingletonInstanceProvider.java
new file mode 100644
index 00000000..cc5963f7
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/SingletonInstanceProvider.java
@@ -0,0 +1,29 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2015, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
+ * 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;
+
+/**
+ * A provider implementation that always returns the same object instance. 
+ * @author Zoltan Ujhelyi
+ */
+public class SingletonInstanceProvider<T> implements IProvider<T>{
+
+    private T instance;
+
+    public SingletonInstanceProvider(T instance) {
+        Preconditions.checkArgument(instance != null, "Instance parameter must not be null.");
+        this.instance = instance;
+    }
+    
+    @Override
+    public T get() {
+        return instance;
+    }
+    
+}
\ No newline at end of file