1 files changed, 46 insertions, 0 deletions
diff --git a/eelf-logger/eelf-logger-logback-impl/src/main/java/org/onap/dcae/utils/eelf/logger/logback/resolver/EnvironmentPropertyResolver.java b/eelf-logger/eelf-logger-logback-impl/src/main/java/org/onap/dcae/utils/eelf/logger/logback/resolver/EnvironmentPropertyResolver.java
new file mode 100644
index 0000000..8f3d59f
--- /dev/null
+++ b/eelf-logger/eelf-logger-logback-impl/src/main/java/org/onap/dcae/utils/eelf/logger/logback/resolver/EnvironmentPropertyResolver.java
@@ -0,0 +1,46 @@
+/*
+ * ================================================================================
+ * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ *
+ */
+
+package org.onap.dcae.utils.eelf.logger.logback.resolver;
+
+import java.util.List;
+
+/**
+ * Looks up Property values inside HOST environment variables
+ *
+ * @author Rajiv Singla
+ */
+public class EnvironmentPropertyResolver implements PropertyResolver {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    public String resolve(final List<String> propertyNames) {
+
+        // check if system environment variables have property names set
+        for (final String propertyName : propertyNames) {
+            final String propertyValue = System.getenv(propertyName);
+            if (propertyValue != null) {
+                return propertyValue;
+            }
+        }
+
+        return null;
+    }
+}