Fix sonar issues

Added static inner class for initializing system prop

Change-Id: I63c23640058a68c7f8d228a2a509d1b440fd20e6
Issue-ID: SDC-343
Signed-off-by: siddharth0905 <siddharth.singh4@amdocs.com>

1 files changed, 67 insertions, 65 deletions

diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-core/src/main/java/org/openecomp/core/zusammen/impl/CassandraConnectionInitializer.java b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-core/src/main/java/org/openecomp/core/zusammen/impl/CassandraConnectionInitializer.java
index 0115ab6d5b..8eeeb1e27b 100644
--- a/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-core/src/main/java/org/openecomp/core/zusammen/impl/CassandraConnectionInitializer.java
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-zusammen-lib/openecomp-zusammen-core/src/main/java/org/openecomp/core/zusammen/impl/CassandraConnectionInitializer.java
@@ -1,33 +1,46 @@
-package org.openecomp.core.zusammen.impl;
+/*
+ * Copyright © 2016-2017 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.core.zusammen.impl;
 
 import org.apache.commons.lang3.StringUtils;
+
 import org.openecomp.core.nosqldb.util.CassandraUtils;
 
+import java.util.function.Supplier;
+
 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;
-import java.util.Objects;
-
-/**
- * @author Avrahamg
- * @since April 25, 2017
- */
 
 public class CassandraConnectionInitializer implements ServletContextListener {
 
-  private static String DATA_CENTER_PROPERTY_NAME = "cassandra.datacenter";
-  private static String CONSISTENCY_LEVEL_PROPERTY_NAME = "cassandra.consistency.level";
-  private static String NODES_PROPERTY_NAME = "cassandra.nodes";
-  private static String AUTHENTICATE_PROPERTY_NAME = "cassandra.authenticate";
-  private static String TRUE = "true";
-  private static String FALSE = "false";
-  private static String SSL_PROPERTY_NAME = "cassandra.ssl";
-  private static String TRUSTSTORE_PROPERTY_NAME = "cassandra.truststore";
-  private static String TRUSTSTORE_PASSWORD_PROPERTY_NAME = "cassandra.truststore.password";
-  private static String USER_PROPERTY_NAME = "cassandra.user";
-  private static String PASSWORD_PROPERTY_NAME = "cassandra.password";
-  private static String KEYSPACE_PROPERTY_NAME = "cassandra.keyspace";
-  private static String ZUSAMMEN = "zusammen";
+  private static final String CASSANDRA_PREFIX = "cassandra.";
+  private static final String DATA_CENTER_PROPERTY_NAME = CASSANDRA_PREFIX + "datacenter";
+  private static final String CONSISTENCY_LEVEL_PROPERTY_NAME =
+      CASSANDRA_PREFIX + "consistency.level";
+  private static final String NODES_PROPERTY_NAME = CASSANDRA_PREFIX + "nodes";
+  private static final String AUTHENTICATE_PROPERTY_NAME = CASSANDRA_PREFIX + "authenticate";
+  private static final String SSL_PROPERTY_NAME = CASSANDRA_PREFIX + "ssl";
+  private static final String TRUSTSTORE_PROPERTY_NAME = CASSANDRA_PREFIX + "truststore";
+  private static final String TRUSTSTORE_PASSWORD_PROPERTY_NAME =
+      CASSANDRA_PREFIX + "truststore.password";
+  private static final String USER_PROPERTY_NAME = CASSANDRA_PREFIX + "user";
+  private static final String PASSWORD_PROPERTY_NAME = CASSANDRA_PREFIX + "password";
+  private static final String KEYSPACE_PROPERTY_NAME = CASSANDRA_PREFIX + "keyspace";
+  private static final String ZUSAMMEN = "zusammen";
 
   @Override
   public void contextInitialized(ServletContextEvent servletContextEvent) {
@@ -35,64 +48,53 @@ public class CassandraConnectionInitializer implements ServletContextListener {
   }
 
   public static void setCassandraConnectionPropertiesToSystem() {
+    DeferredInitializer.init();
+  }
 
-    if (!System.getProperties().containsKey(NODES_PROPERTY_NAME)) {
-      System.setProperty(NODES_PROPERTY_NAME, StringUtils.join(CassandraUtils.getAddresses(), ','));
-    }
-
-    if (!System.getProperties().containsKey(AUTHENTICATE_PROPERTY_NAME)) {
-      System.setProperty(AUTHENTICATE_PROPERTY_NAME,
-          CassandraUtils.isAuthenticate() ? TRUE : FALSE);
-    }
-    if (!System.getProperties().containsKey(SSL_PROPERTY_NAME)) {
-      System.setProperty(SSL_PROPERTY_NAME,
-          CassandraUtils.isSsl() ? TRUE : FALSE);
-    }
-
-    if (!System.getProperties().containsKey(TRUSTSTORE_PROPERTY_NAME)) {
-      System.setProperty(TRUSTSTORE_PROPERTY_NAME, CassandraUtils.getTruststore());
-    }
+  @Override
+  public void contextDestroyed(ServletContextEvent servletContextEvent) {
+    // no-op, required by the interface
+  }
 
-    if (!System.getProperties().containsKey(TRUSTSTORE_PASSWORD_PROPERTY_NAME)) {
-      System.setProperty(TRUSTSTORE_PASSWORD_PROPERTY_NAME, CassandraUtils.getTruststorePassword());
+  private static class DeferredInitializer {
+
+    static {
+      setSystemProperty(NODES_PROPERTY_NAME, () ->
+          StringUtils.join(CassandraUtils.getAddresses(), ','));
+      setBooleanSystemProperty(AUTHENTICATE_PROPERTY_NAME, CassandraUtils::isAuthenticate);
+      setBooleanSystemProperty(SSL_PROPERTY_NAME, CassandraUtils::isSsl);
+      setSystemProperty(TRUSTSTORE_PROPERTY_NAME, CassandraUtils::getTruststore);
+      setSystemProperty(TRUSTSTORE_PASSWORD_PROPERTY_NAME, CassandraUtils::getTruststorePassword);
+      setSystemProperty(USER_PROPERTY_NAME, CassandraUtils::getUser);
+      setSystemProperty(PASSWORD_PROPERTY_NAME, CassandraUtils::getPassword);
+      setSystemProperty(KEYSPACE_PROPERTY_NAME, () -> ZUSAMMEN);
+      setNullableSystemProperty(DATA_CENTER_PROPERTY_NAME, CassandraUtils::getLocalDataCenter);
+      setNullableSystemProperty(CONSISTENCY_LEVEL_PROPERTY_NAME,
+          CassandraUtils::getConsistencyLevel);
     }
 
-    if (!System.getProperties().containsKey(USER_PROPERTY_NAME)) {
-      System.setProperty(USER_PROPERTY_NAME, CassandraUtils.getUser());
-    }
+    private static void setSystemProperty(String name, Supplier<String> valueSupplier) {
 
-    if (!System.getProperties().containsKey(PASSWORD_PROPERTY_NAME)) {
-      System.setProperty(PASSWORD_PROPERTY_NAME, CassandraUtils.getPassword());
+      if (System.getProperty(name) == null) {
+        System.setProperty(name, valueSupplier.get());
+      }
     }
 
-    if (!System.getProperties().containsKey(KEYSPACE_PROPERTY_NAME)) {
-      System.setProperty(KEYSPACE_PROPERTY_NAME, ZUSAMMEN);
+    private static void setBooleanSystemProperty(String name, Supplier<Boolean> valueSupplier) {
+      setSystemProperty(name, () -> Boolean.toString(valueSupplier.get()));
     }
 
+    private static void setNullableSystemProperty(String name, Supplier<String> valueSupplier) {
 
-    if (!System.getProperties().containsKey(DATA_CENTER_PROPERTY_NAME)) {
-      String dataCenter = CassandraUtils.getLocalDataCenter();
-      if (Objects.nonNull(dataCenter)) {
-        System.setProperty(DATA_CENTER_PROPERTY_NAME, dataCenter);
-      }
-    }
-
-    if (!System.getProperties().containsKey(CONSISTENCY_LEVEL_PROPERTY_NAME)) {
-      String consistencyLevel = CassandraUtils.getConsistencyLevel();
-      if (Objects.nonNull(consistencyLevel)) {
-        System.setProperty(CONSISTENCY_LEVEL_PROPERTY_NAME, consistencyLevel);
+      if ((System.getProperty(name) == null) && (valueSupplier.get() != null)) {
+        System.setProperty(name, valueSupplier.get());
       }
     }
 
+    private DeferredInitializer() { }
 
-  }
-
-  //       -Dcassandra.nodes=10.147.97.145  -Dcassandra.keyspace=zusammen -Dcassandra.authenticate=true -Dcassandra.ssl=true
-  // -Dcassandra.truststore=/apps/jetty/base/be/config/.truststore -Dcassandra.truststore.password=Aa123456
-  // -Dcassandra.user=asdc_user -Dcassandra.password=Aa1234%^!
-
-  @Override
-  public void contextDestroyed(ServletContextEvent servletContextEvent) {
-
+    public static void init() {
+      // just to ensure static initialization
+    }
   }
 }