Cleanup of utils classes.

Removed javadoc without any information; enforced util class won't be initialized;
extracted constants.

Change-Id: Ie30156472d929dfc95819a1d5affaaf867eed611
Issue-ID: CLAMP-96
Signed-off-by: biniek <lukasz.biniek@nokia.com>

6 files changed, 120 insertions, 188 deletions

diff --git a/src/main/java/org/onap/clamp/clds/client/req/sdc/SdcCatalogServices.java b/src/main/java/org/onap/clamp/clds/client/req/sdc/SdcCatalogServices.java
index 14421da5..372f8e81 100644
--- a/src/main/java/org/onap/clamp/clds/client/req/sdc/SdcCatalogServices.java
+++ b/src/main/java/org/onap/clamp/clds/client/req/sdc/SdcCatalogServices.java
@@ -93,13 +93,12 @@ public class SdcCatalogServices {
     private static final String RESOURCE_URL_PREFIX = "resources";

     @Autowired

     private RefProp refProp;

-    private CryptoUtils cryptoUtils = new CryptoUtils();

 

     // returns SDC id and password as a HTTP Basic Auth string (for example: Basic dGVzdDoxMjM0NTY=)

     private String getSdcBasicAuth() throws GeneralSecurityException, DecoderException {

         String sdcId = refProp.getStringValue("sdc.serviceUsername");

         String sdcPw = refProp.getStringValue("sdc.servicePassword");

-        String password = cryptoUtils.decrypt(sdcPw);

+        String password = CryptoUtils.decrypt(sdcPw);

         String idPw = Base64.getEncoder().encodeToString((sdcId + ":" + password).getBytes(StandardCharsets.UTF_8));

         return "Basic " + idPw;

     }

diff --git a/src/main/java/org/onap/clamp/clds/config/EncodedPasswordBasicDataSource.java b/src/main/java/org/onap/clamp/clds/config/EncodedPasswordBasicDataSource.java
index 453689be..9914ea73 100644
--- a/src/main/java/org/onap/clamp/clds/config/EncodedPasswordBasicDataSource.java
+++ b/src/main/java/org/onap/clamp/clds/config/EncodedPasswordBasicDataSource.java
@@ -41,14 +41,6 @@ public class EncodedPasswordBasicDataSource extends BasicDataSource {
     protected static final EELFLogger logger        = EELFManager.getInstance()
             .getLogger(EncodedPasswordBasicDataSource.class);
     protected static final EELFLogger metricsLogger = EELFManager.getInstance().getMetricsLogger();
-    private CryptoUtils               cryptoUtils   = new CryptoUtils();
-
-    /**
-     * The default constructor calling the parent one.
-     */
-    public EncodedPasswordBasicDataSource() {
-        super();
-    }
 
     /**
      * This method is used automatically by Spring to decode the password.
@@ -56,7 +48,7 @@ public class EncodedPasswordBasicDataSource extends BasicDataSource {
     @Override
     public synchronized void setPassword(String encodedPassword) {
         try {
-            this.password = cryptoUtils.decrypt(encodedPassword);
+            this.password = CryptoUtils.decrypt(encodedPassword);
         } catch (GeneralSecurityException e) {
             logger.error("Unable to decrypt the DB password", e);
         } catch (DecoderException e) {
diff --git a/src/main/java/org/onap/clamp/clds/model/prop/AbstractModelElement.java b/src/main/java/org/onap/clamp/clds/model/prop/AbstractModelElement.java
index 9ced0199..a0685228 100644
--- a/src/main/java/org/onap/clamp/clds/model/prop/AbstractModelElement.java
+++ b/src/main/java/org/onap/clamp/clds/model/prop/AbstractModelElement.java
@@ -26,7 +26,6 @@ package org.onap.clamp.clds.model.prop;
 import com.att.eelf.configuration.EELFLogger;
 import com.att.eelf.configuration.EELFManager;
 import com.fasterxml.jackson.databind.JsonNode;
-
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
@@ -37,29 +36,25 @@ import java.util.List;
  * ...)
  */
 public abstract class AbstractModelElement {
-    protected static final EELFLogger logger        = EELFManager.getInstance().getLogger(AbstractModelElement.class);
-    protected static final EELFLogger auditLogger   = EELFManager.getInstance().getAuditLogger();
 
-    private final String              type;
-    private final ModelBpmn           modelBpmn;
-    private final String              id;
-    protected String                  topicPublishes;
-    protected final JsonNode          modelElementJsonNode;
-    private boolean                   isFound;
+    protected static final EELFLogger logger = EELFManager.getInstance().getLogger(AbstractModelElement.class);
+    protected static final EELFLogger auditLogger = EELFManager.getInstance().getAuditLogger();
+
+    private final String type;
+    private final ModelBpmn modelBpmn;
+    private final String id;
+    protected String topicPublishes;
+    protected final JsonNode modelElementJsonNode;
+    private boolean isFound;
 
-    private final ModelProperties     modelProp;
+    private final ModelProperties modelProp;
 
-    private static final String       LOG_ELEMENT   = "Value '";
-    private static final String       LOG_NOT_FOUND = "' for key 'name' not found in JSON";
+    private static final String LOG_ELEMENT_NOT_FOUND = "Value '{}' for key 'name' not found in JSON";
+    private static final String LOG_ELEMENT_NOT_FOUND_IN_JSON = "Value '{}' for key 'name' not found in JSON {}";
 
     /**
      * Perform base parsing of properties for a ModelElement (such as,
      * VesCollector, Policy and Tca)
-     *
-     * @param type
-     * @param modelProp
-     * @param modelBpmn
-     * @param modelJson
      */
     protected AbstractModelElement(String type, ModelProperties modelProp, ModelBpmn modelBpmn, JsonNode modelJson) {
         this.type = type;
@@ -97,10 +92,6 @@ public abstract class AbstractModelElement {
     /**
      * Return the value field of the json node element that has a name field
      * equals to the given name.
-     *
-     * @param nodeIn
-     * @param name
-     * @return
      */
     public static String getValueByName(JsonNode nodeIn, String name) {
         String value = null;
@@ -119,9 +110,9 @@ public abstract class AbstractModelElement {
             }
         }
         if (value == null || value.length() == 0) {
-            logger.warn(LOG_ELEMENT + name + LOG_NOT_FOUND);
+            logger.warn(LOG_ELEMENT_NOT_FOUND, name);
         } else {
-            logger.debug(LOG_ELEMENT + name + LOG_NOT_FOUND + nodeIn.toString());
+            logger.debug(LOG_ELEMENT_NOT_FOUND_IN_JSON, name, nodeIn.toString());
         }
         return value;
     }
@@ -129,10 +120,6 @@ public abstract class AbstractModelElement {
     /**
      * Return the value field of the json node element that has a name field
      * that equals the given name.
-     * 
-     * @param nodeIn
-     * @param name
-     * @return
      */
     public static String getNodeValueByName(JsonNode nodeIn, String name) {
         String value = null;
@@ -140,9 +127,9 @@ public abstract class AbstractModelElement {
             value = nodeIn.path(name).asText();
         }
         if (value == null || value.length() == 0) {
-            logger.warn(LOG_ELEMENT + name + LOG_NOT_FOUND);
+            logger.warn(LOG_ELEMENT_NOT_FOUND, name);
         } else {
-            logger.debug(LOG_ELEMENT + name + LOG_NOT_FOUND + nodeIn.toString());
+            logger.debug(LOG_ELEMENT_NOT_FOUND_IN_JSON, name, nodeIn.toString());
         }
         return value;
     }
@@ -150,17 +137,11 @@ public abstract class AbstractModelElement {
     /**
      * Return the value field of the json node element that has a name field
      * that equals the given name.
-     * 
-     * @param nodeIn
-     * @param name
-     * @return
      */
     public static List<String> getNodeValuesByName(JsonNode nodeIn, String name) {
         List<String> values = new ArrayList<>();
         if (nodeIn != null) {
-            Iterator<JsonNode> i = nodeIn.iterator();
-            while (i.hasNext()) {
-                JsonNode node = i.next();
+            for (JsonNode node : nodeIn) {
                 if (node.path("name").asText().equals(name)) {
                     JsonNode vnode = node.path("value");
                     if (vnode.isArray()) {
@@ -179,10 +160,6 @@ public abstract class AbstractModelElement {
     /**
      * Return the int value field of the json node element that has a name field
      * equals to the given name.
-     *
-     * @param nodeIn
-     * @param name
-     * @return
      */
     public static Integer getIntValueByName(JsonNode nodeIn, String name) {
         String value = getValueByName(nodeIn, name);
@@ -192,35 +169,26 @@ public abstract class AbstractModelElement {
     /**
      * Return an array of values for the field of the json node element that has
      * a name field equals to the given name.
-     *
-     * @param nodeIn
-     * @param name
-     * @return
      */
     public static List<String> getValuesByName(JsonNode nodeIn, String name) {
         List<String> values = null;
         if (nodeIn != null) {
-            Iterator<JsonNode> i = nodeIn.iterator();
-            while (i.hasNext()) {
-                JsonNode node = i.next();
+            for (JsonNode node : nodeIn) {
                 if (node.path("name").asText().equals(name)) {
                     values = getValuesList(node);
                 }
             }
         }
         if (values == null || values.isEmpty()) {
-            logger.warn(LOG_ELEMENT + name + LOG_NOT_FOUND);
+            logger.warn(LOG_ELEMENT_NOT_FOUND, name);
         } else {
-            logger.debug(LOG_ELEMENT + name + LOG_NOT_FOUND + nodeIn.toString());
+            logger.debug(LOG_ELEMENT_NOT_FOUND_IN_JSON, name, nodeIn.toString());
         }
         return values;
     }
 
     /**
      * Return an array of String values.
-     *
-     * @param nodeIn
-     * @return
      */
     public static List<String> getValuesList(JsonNode nodeIn) {
         ArrayList<String> al = new ArrayList<>();
@@ -237,9 +205,6 @@ public abstract class AbstractModelElement {
     /**
      * Return the value field of the json node element that has a name field
      * equals to the given name.
-     *
-     * @param name
-     * @return
      */
     public String getValueByName(String name) {
         return getValueByName(modelElementJsonNode, name);
@@ -248,9 +213,6 @@ public abstract class AbstractModelElement {
     /**
      * Return the int value field of the json node element that has a name field
      * equals to the given name.
-     *
-     * @param name
-     * @return
      */
     public Integer getIntValueByName(String name) {
         return getIntValueByName(modelElementJsonNode, name);
@@ -259,9 +221,6 @@ public abstract class AbstractModelElement {
     /**
      * Return an array of values for the field of the json node element that has
      * a name field equals to the given name.
-     *
-     * @param name
-     * @return
      */
     public List<String> getValuesByName(String name) {
         return getValuesByName(modelElementJsonNode, name);
diff --git a/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java b/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java
index 2c91f009..42439961 100644
--- a/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java
+++ b/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java
@@ -25,17 +25,15 @@ package org.onap.clamp.clds.util;
 
 import com.att.eelf.configuration.EELFLogger;
 import com.att.eelf.configuration.EELFManager;
-
+import com.google.common.base.Charsets;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.security.GeneralSecurityException;
 import java.security.SecureRandom;
 import java.util.Properties;
-
 import javax.crypto.Cipher;
 import javax.crypto.spec.IvParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
-
 import org.apache.commons.codec.DecoderException;
 import org.apache.commons.codec.binary.Hex;
 import org.apache.commons.lang3.ArrayUtils;
@@ -46,9 +44,6 @@ import org.apache.commons.lang3.ArrayUtils;
  */
 public final class CryptoUtils {
 
-    /**
-     * Used to log.
-     */
     private static final EELFLogger logger = EELFManager.getInstance().getLogger(CryptoUtils.class);
     // Openssl commands:
     // Encrypt: echo -n "123456" | openssl aes-128-cbc -e -K <Private Hex key>
@@ -66,85 +61,87 @@ public final class CryptoUtils {
     /**
      * Detailed definition of encryption algorithm.
      */
-    private static final String ALGORYTHM_DETAILS = ALGORITHM + "/CBC/PKCS5PADDING";
-    /**
-     * Block SIze in bits.
-     */
-    private static final int BLOCK_SIZE = 128;
+    private static final String ALGORITHM_DETAILS = ALGORITHM + "/CBC/PKCS5PADDING";
+    private static final int BLOCK_SIZE_IN_BITS = 128;
+    private static final int BLOCK_SIZE_IN_BYTES = BLOCK_SIZE_IN_BITS / 8;
     /**
      * Key to read in the key.properties file.
      */
     private static final String KEY_PARAM = "org.onap.clamp.encryption.aes.key";
+    private static final String PROPERTIES_FILE_NAME = "clds/key.properties";
     /**
      * The SecretKeySpec created from the Base 64 String key.
      */
-    private static SecretKeySpec secretKeySpec = null;
+    private static final SecretKeySpec SECRET_KEY_SPEC = readSecretKeySpec(PROPERTIES_FILE_NAME);
 
-    // Static init
-    static {
-        Properties props = new Properties();
-        try {
-            props.load(ResourceFileUtil.getResourceAsStream("clds/key.properties"));
-            secretKeySpec = getSecretKeySpec(props.getProperty(KEY_PARAM));
-        } catch (IOException | DecoderException e) {
-            logger.error("Exception occurred during the key reading", e);
-        }
+    /**
+     * Private constructor to avoid creating instances of util class.
+     */
+    private CryptoUtils() {
     }
 
     /**
      * Encrypt a value based on the Clamp Encryption Key.
-     * 
-     * @param value
-     *            The value to encrypt
+     *
+     * @param value The value to encrypt
      * @return The encrypted string
-     * @throws GeneralSecurityException
-     *             In case of issue with the encryption
-     * @throws UnsupportedEncodingException
-     *             In case of issue with the charset conversion
+     * @throws GeneralSecurityException In case of issue with the encryption
+     * @throws UnsupportedEncodingException In case of issue with the charset conversion
      */
-    public String encrypt(String value) throws GeneralSecurityException, UnsupportedEncodingException {
-        Cipher cipher = Cipher.getInstance(CryptoUtils.ALGORYTHM_DETAILS, "SunJCE");
+    public static String encrypt(String value) throws GeneralSecurityException, UnsupportedEncodingException {
+        Cipher cipher = Cipher.getInstance(ALGORITHM_DETAILS, "SunJCE");
         SecureRandom randomNumber = SecureRandom.getInstance("SHA1PRNG");
-        byte[] iv = new byte[BLOCK_SIZE / 8];
+        byte[] iv = new byte[BLOCK_SIZE_IN_BYTES];
         randomNumber.nextBytes(iv);
         IvParameterSpec ivspec = new IvParameterSpec(iv);
-        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivspec);
-        return Hex.encodeHexString(ArrayUtils.addAll(iv, cipher.doFinal(value.getBytes("UTF-8"))));
+        cipher.init(Cipher.ENCRYPT_MODE, SECRET_KEY_SPEC, ivspec);
+        return Hex.encodeHexString(ArrayUtils.addAll(iv, cipher.doFinal(value.getBytes(Charsets.UTF_8))));
     }
 
     /**
      * Decrypt a value based on the Clamp Encryption Key.
-     * 
-     * @param message
-     *            The encrypted string that must be decrypted using the Clamp
-     *            Encryption Key
+     *
+     * @param message The encrypted string that must be decrypted using the Clamp Encryption Key
      * @return The String decrypted
-     * @throws GeneralSecurityException
-     *             In case of issue with the encryption
-     * @throws DecoderException
-     *             In case of issue to decode the HexString
+     * @throws GeneralSecurityException In case of issue with the encryption
+     * @throws DecoderException In case of issue to decode the HexString
      */
-    public String decrypt(String message) throws GeneralSecurityException, DecoderException {
+    public static String decrypt(String message) throws GeneralSecurityException, DecoderException {
         byte[] encryptedMessage = Hex.decodeHex(message.toCharArray());
-        Cipher cipher = Cipher.getInstance(CryptoUtils.ALGORYTHM_DETAILS, "SunJCE");
-        IvParameterSpec ivspec = new IvParameterSpec(ArrayUtils.subarray(encryptedMessage, 0, BLOCK_SIZE / 8));
-        byte[] realData = ArrayUtils.subarray(encryptedMessage, BLOCK_SIZE / 8, encryptedMessage.length);
-        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivspec);
+        Cipher cipher = Cipher.getInstance(ALGORITHM_DETAILS, "SunJCE");
+        IvParameterSpec ivspec = new IvParameterSpec(ArrayUtils.subarray(encryptedMessage, 0, BLOCK_SIZE_IN_BYTES));
+        byte[] realData = ArrayUtils.subarray(encryptedMessage, BLOCK_SIZE_IN_BYTES, encryptedMessage.length);
+        cipher.init(Cipher.DECRYPT_MODE, SECRET_KEY_SPEC, ivspec);
         byte[] decrypted = cipher.doFinal(realData);
         return new String(decrypted);
     }
 
     /**
      * Method used to generate the SecretKeySpec from a Base64 String.
-     * 
-     * @param keyString
-     *            The key as a string in Base 64
+     *
+     * @param keyString The key as a string in Base 64
      * @return The SecretKeySpec created
-     * @throws DecoderException
-     *             In case of issues with the decoding of Base64
+     * @throws DecoderException In case of issues with the decoding of Base64
      */
     private static SecretKeySpec getSecretKeySpec(String keyString) throws DecoderException {
         byte[] key = Hex.decodeHex(keyString.toCharArray());
-        return new SecretKeySpec(key, CryptoUtils.ALGORITHM);
+        return new SecretKeySpec(key, ALGORITHM);
+    }
+
+    /**
+     * Reads SecretKeySpec from file specified by propertiesFileName
+     *
+     * @param propertiesFileName File name with properties
+     * @return SecretKeySpec secret key spec read from propertiesFileName
+     */
+    private static SecretKeySpec readSecretKeySpec(String propertiesFileName) {
+        Properties props = new Properties();
+        try {
+            props.load(ResourceFileUtil.getResourceAsStream(propertiesFileName));
+            return getSecretKeySpec(props.getProperty(KEY_PARAM));
+        } catch (IOException | DecoderException e) {
+            logger.error("Exception occurred during the key reading", e);
+            return null;
+        }
     }
 }
diff --git a/src/main/java/org/onap/clamp/clds/util/LoggingUtils.java b/src/main/java/org/onap/clamp/clds/util/LoggingUtils.java
index b501b2df..bca41341 100644
--- a/src/main/java/org/onap/clamp/clds/util/LoggingUtils.java
+++ b/src/main/java/org/onap/clamp/clds/util/LoggingUtils.java
@@ -28,23 +28,28 @@ import java.text.SimpleDateFormat;
 import java.util.Date;

 import java.util.TimeZone;

 import java.util.UUID;

-

+import javax.validation.constraints.NotNull;

 import org.apache.log4j.MDC;

 

 /**

  * This class handles the special info that appear in the log, like RequestID,

  * time context, ...

- *

  */

-public class LoggingUtils {

+public final class LoggingUtils {

+

+    private static final DateFormat DATE_FORMAT = createDateFormat();

+

+    /**

+     * Private constructor to avoid creating instances of util class.

+     */

+    private LoggingUtils() {

+    }

 

     /**

      * Set request related logging variables in thread local data via MDC

-     * 

-     * @param service

-     *            Service Name of API (ex. "PUT template")

-     * @param partner

-     *            Partner name (client or user invoking API)

+     *

+     * @param service Service Name of API (ex. "PUT template")

+     * @param partner Partner name (client or user invoking API)

      */

     public static void setRequestContext(String service, String partner) {

         MDC.put("RequestId", UUID.randomUUID().toString());

@@ -54,37 +59,22 @@ public class LoggingUtils {
 

     /**

      * Set time related logging variables in thread local data via MDC.

-     * 

-     * @param beginTimeStamp

-     *            Start time

-     * @param endTimeStamp

-     *            End time

+     *

+     * @param beginTimeStamp Start time

+     * @param endTimeStamp End time

      */

-    public static void setTimeContext(Date beginTimeStamp, Date endTimeStamp) {

-        String beginTime = "";

-        String endTime = "";

-        String elapsedTime = "";

-

-        if (beginTimeStamp != null && endTimeStamp != null) {

-            elapsedTime = String.valueOf(endTimeStamp.getTime() - beginTimeStamp.getTime());

-            beginTime = generateTimestampStr(beginTimeStamp);

-            endTime = generateTimestampStr(endTimeStamp);

-        }

-

-        MDC.put("BeginTimestamp", beginTime);

-        MDC.put("EndTimestamp", endTime);

-        MDC.put("ElapsedTime", elapsedTime);

+    public static void setTimeContext(@NotNull Date beginTimeStamp, @NotNull Date endTimeStamp) {

+        MDC.put("BeginTimestamp", generateTimestampStr(beginTimeStamp));

+        MDC.put("EndTimestamp", generateTimestampStr(endTimeStamp));

+        MDC.put("ElapsedTime", String.valueOf(endTimeStamp.getTime() - beginTimeStamp.getTime()));

     }

 

     /**

      * Set response related logging variables in thread local data via MDC.

-     * 

-     * @param code

-     *            Response code ("0" indicates success)

-     * @param description

-     *            Response description

-     * @param className

-     *            class name of invoking class

+     *

+     * @param code Response code ("0" indicates success)

+     * @param description Response description

+     * @param className class name of invoking class

      */

     public static void setResponseContext(String code, String description, String className) {

         MDC.put("ResponseCode", code);

@@ -95,11 +85,9 @@ public class LoggingUtils {
 

     /**

      * Set target related logging variables in thread local data via MDC

-     * 

-     * @param targetEntity

-     *            Target entity (an external/sub component, for ex. "sdc")

-     * @param targetServiceName

-     *            Target service name (name of API invoked on target)

+     *

+     * @param targetEntity Target entity (an external/sub component, for ex. "sdc")

+     * @param targetServiceName Target service name (name of API invoked on target)

      */

     public static void setTargetContext(String targetEntity, String targetServiceName) {

         MDC.put("TargetEntity", targetEntity != null ? targetEntity : "");

@@ -108,11 +96,9 @@ public class LoggingUtils {
 

     /**

      * Set error related logging variables in thread local data via MDC.

-     * 

-     * @param code

-     *            Error code

-     * @param description

-     *            Error description

+     *

+     * @param code Error code

+     * @param description Error description

      */

     public static void setErrorContext(String code, String description) {

         MDC.put("ErrorCode", code);

@@ -120,28 +106,31 @@ public class LoggingUtils {
     }

 

     private static String generateTimestampStr(Date timeStamp) {

-        DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX");

-        TimeZone tz = TimeZone.getTimeZone("UTC");

-        df.setTimeZone(tz);

-        return df.format(timeStamp);

+        return DATE_FORMAT.format(timeStamp);

     }

 

     /**

      * Get a previously stored RequestID for the thread local data via MDC. If

      * one was not previously stored, generate one, store it, and return that

      * one.

-     * 

+     *

      * @return A string with the request ID

      */

     public static String getRequestId() {

-        String reqid;

+        String requestId;

 

-        reqid = (String) MDC.get("RequestID");

-        if (reqid == null || reqid.isEmpty()) {

-            reqid = UUID.randomUUID().toString();

-            MDC.put("RequestId", reqid);

+        requestId = (String) MDC.get("RequestID");

+        if (requestId == null || requestId.isEmpty()) {

+            requestId = UUID.randomUUID().toString();

+            MDC.put("RequestId", requestId);

         }

-        return reqid;

+        return requestId;

+    }

+

+    private static DateFormat createDateFormat() {

+        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX");

+        dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));

+        return dateFormat;

     }

 

 }

diff --git a/src/main/java/org/onap/clamp/clds/util/ResourceFileUtil.java b/src/main/java/org/onap/clamp/clds/util/ResourceFileUtil.java
index 0aaa09ac..57705d8f 100644
--- a/src/main/java/org/onap/clamp/clds/util/ResourceFileUtil.java
+++ b/src/main/java/org/onap/clamp/clds/util/ResourceFileUtil.java
@@ -25,23 +25,22 @@ package org.onap.clamp.clds.util;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.Scanner;
 
 /**
  * Utility methods supporting transforms.
  */
-public class ResourceFileUtil {
+public final class ResourceFileUtil {
 
     /**
-     * Disable the ResourceFileUtil constructor.
+     * Private constructor to avoid creating instances of util class.
      */
     private ResourceFileUtil() {
-
     }
 
     /**
      * Return resource as a Stream.
      *
-     * @param name
      * @return resource - resource as stream
      */
     public static InputStream getResourceAsStream(String name) {
@@ -54,14 +53,11 @@ public class ResourceFileUtil {
 
     /**
      * Return resource as a Stream.
-     *
-     * @param name
-     * @throws IOException
      */
     public static String getResourceAsString(String name) throws IOException {
         InputStream is = getResourceAsStream(name);
-        java.util.Scanner scanner = new java.util.Scanner(is);
-        java.util.Scanner delimitedScanner = scanner.useDelimiter("\\A");
+        Scanner scanner = new Scanner(is);
+        Scanner delimitedScanner = scanner.useDelimiter("\\A");
         String text = delimitedScanner.hasNext() ? delimitedScanner.next() : "";
         delimitedScanner.close();
         scanner.close();