1 files changed, 55 insertions, 0 deletions
diff --git a/openecomp-be/lib/openecomp-sdc-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/servlet/HttpHeader.java b/openecomp-be/lib/openecomp-sdc-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/servlet/HttpHeader.java
new file mode 100644
index 0000000000..4dcc197796
--- /dev/null
+++ b/openecomp-be/lib/openecomp-sdc-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/servlet/HttpHeader.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2016-2018 European Support Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openecomp.sdc.logging.servlet;
+
+import java.util.function.Function;
+
+/**
+ * Handles any of possible header names to read a value for that header. This is useful for backward compatibility, if
+ * multiple headers may have the same meaning. For instance, when requests come from multiple service, some using an old
+ * header and others using a new header to pass the same information.
+ *
+ * @author evitaliy
+ * @since 25 Mar 2018
+ */
+public class HttpHeader {
+
+    private final String[] keys;
+
+    public HttpHeader(String... keys) {
+        this.keys = keys;
+    }
+
+    /**
+     * Returns the value of any of the possible headers.
+     *
+     * @param reader function for reading an HTTP header.
+     * @return value or null if not found
+     */
+    public String getAny(Function<String, String> reader) {
+
+        for (String k : keys) {
+
+            String value = reader.apply(k);
+            if (value != null) {
+                return value;
+            }
+        }
+
+        return null;
+    }
+}