1 files changed, 70 insertions, 0 deletions
diff --git a/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/EnvVarFileResolver.java b/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/EnvVarFileResolver.java
new file mode 100644
index 00000000..3e438d1a
--- /dev/null
+++ b/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/EnvVarFileResolver.java
@@ -0,0 +1,70 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * onap
+ * ================================================================================
+ * Copyright (C) 2016 - 2017 ONAP
+ * ================================================================================
+ * 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.ccsdk.sli.core.utils;
+
+import com.google.common.base.Strings;
+
+import java.io.File;
+import java.nio.file.Paths;
+import java.util.Optional;
+
+/**
+ * Resolves dblib properties files relative to the directory identified by the <code>SDNC_CONFIG_DIR</code>
+ * environment variable.
+ */
+public abstract class EnvVarFileResolver implements PropertiesFileResolver {
+
+    /**
+     * Key for environment variable representing the configuration directory
+     */
+    private final String propertyKey;
+
+    private final String successMessage;
+
+    public EnvVarFileResolver(final String successMessage, final String propertyKey) {
+        this.successMessage = successMessage;
+        this.propertyKey = propertyKey;
+    }
+
+    /**
+     * Parse a properties file location based on System environment variable
+     *
+     * @return an Optional File containing the location if it exists, or an empty Optional
+     */
+    @Override
+    public Optional<File> resolveFile(final String filename) {
+        // attempt to resolve the property directory from the corresponding environment variable
+        final String propDirectoryFromEnvVariable = System.getenv(propertyKey);
+        final File fileFromEnvVariable;
+        if (!Strings.isNullOrEmpty(propDirectoryFromEnvVariable)) {
+            fileFromEnvVariable = Paths.get(propDirectoryFromEnvVariable).resolve(filename).toFile();
+            if(fileFromEnvVariable.exists()) {
+                return Optional.of(fileFromEnvVariable);
+            }
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public String getSuccessfulResolutionMessage() {
+        return this.successMessage;
+    }
+}