Optimized implementation of VirtualPropertyReplacer.

Added auto configuration for VirtualPropertyResolver.

Signed-off-by: Dominik Herbst <dominik.herbst@bosch-si.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/rsql/VirtualPropertyReplacer.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2015 Bosch Software Innovations GmbH 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
+ */
+package org.eclipse.hawkbit.repository.rsql;
+
+/**
+ * Implementations map a placeholder to the associated value.
+ * <p>
+ * This is used in context of string replacement.
+ */
+@FunctionalInterface
+public interface VirtualPropertyReplacer {
+
+    /**
+     * Looks up a placeholders and replaces them
+     *
+     * @param input
+     *            the input string in which virtual properties should be
+     *            replaced
+     * @return the result of the replacement
+     */
+    String replace(String input);
+}