1 files changed, 109 insertions, 0 deletions
diff --git a/sliPluginUtils/provider/src/main/java/org/onap/ccsdk/sli/core/slipluginutils/Dme2Factory.java b/sliPluginUtils/provider/src/main/java/org/onap/ccsdk/sli/core/slipluginutils/Dme2Factory.java
new file mode 100644
index 00000000..7013a9c5
--- /dev/null
+++ b/sliPluginUtils/provider/src/main/java/org/onap/ccsdk/sli/core/slipluginutils/Dme2Factory.java
@@ -0,0 +1,109 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK
+ * ================================================================================
+ * Copyright (C) 2017 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.ccsdk.sli.core.slipluginutils;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.Vector;
+import org.onap.ccsdk.sli.core.utils.JREFileResolver;
+import org.onap.ccsdk.sli.core.utils.KarafRootFileResolver;
+import org.onap.ccsdk.sli.core.utils.PropertiesFileResolver;
+import org.onap.ccsdk.sli.core.utils.common.CoreDefaultFileResolver;
+import org.onap.ccsdk.sli.core.utils.common.SdncConfigEnvVarFileResolver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Immutable properties container for dme2 properties. Since the initial design decision was made to
+ * utilize <code>Properties</code> instead of an OSGi <code>ManagedService</code>, it was decided to
+ * make these properties immutable.
+ */
+public final class Dme2Factory {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Dme2Factory.class);
+    private static final String DME2_PROPERTIES_FILE_NAME = "dme2.properties";
+
+    static Properties properties;
+    private Vector<PropertiesFileResolver> dme2PropertiesFileResolvers = new Vector<>();
+
+    public Dme2Factory() {
+        dme2PropertiesFileResolvers
+                .add(new SdncConfigEnvVarFileResolver("Using property file (1) from environment variable"));
+        dme2PropertiesFileResolvers.add(new CoreDefaultFileResolver("Using property file (2) from default directory"));
+        dme2PropertiesFileResolvers
+                .add(new JREFileResolver("Using property file (3) from JRE argument", Dme2Factory.class));
+        dme2PropertiesFileResolvers.add(new KarafRootFileResolver("Using property file (4) from karaf root", this));
+        File dme2File = getDme2File(DME2_PROPERTIES_FILE_NAME);
+        init(dme2File);
+    }
+
+    private void init(final File dme2propertiesFile) {
+        try {
+            properties = getProperties(dme2propertiesFile);
+        } catch (final FileNotFoundException e) {
+            LOG.error("dme2.properties file could not be found at path: {}", dme2propertiesFile, e);
+        } catch (final IOException e) {
+            LOG.error("fatal error reading dme2.properties at path: {}", dme2propertiesFile, e);
+        }
+    }
+
+    /**
+     * Reports the method chosen for properties resolution to the <code>Logger</code>.
+     *
+     * @param message Some user friendly message
+     * @param fileOptional The file location of the chosen properties file
+     * @return the file location of the chosen properties file
+     */
+    private static File reportSuccess(final String message, final Optional<File> fileOptional) {
+        if (fileOptional.isPresent()) {
+            final File file = fileOptional.get();
+            LOG.info("{} {}", message, file.getPath());
+            return file;
+        }
+        return null;
+    }
+
+    private File getDme2File(final String dme2Filename) {
+        for (final PropertiesFileResolver dblibPropertiesFileResolver : dme2PropertiesFileResolvers) {
+            final Optional<File> fileOptional = dblibPropertiesFileResolver.resolveFile(dme2Filename);
+            if (fileOptional.isPresent()) {
+                return reportSuccess(dblibPropertiesFileResolver.getSuccessfulResolutionMessage(), fileOptional);
+            }
+        }
+        return (new File(dme2Filename));
+    }
+
+    private static Properties getProperties(final File dme2File) throws IOException {
+        final Properties properties = new Properties();
+        properties.load(new FileReader(dme2File));
+        return properties;
+    }
+       
+    public DME2 createDme2() {
+        return new DME2(properties);
+    }
+
+}