Added REST interfaces for tenant configuration

- added GET, DELETE and PUT function on configuration value interfaces
- changed Exception in TenantConfigurationManagement for correct mapping to HTTP Status
- added function to get global configurations from TenantConfigurationManagement, to have
  only one class for handling these configuration values

Signed-off-by: Nonnenmacher Fabian <fabian.nonnenmacher@bosch-si.com>

hawkbit-core/src/main/java/org/eclipse/hawkbit/exception/SpServerError.java

@@ -181,7 +181,11 @@ public enum SpServerError {
      * 
      */
     SP_CONFIGURATION_VALUE_INVALID("hawkbit.server.error.configValueInvalid",
-            "The given configuration value is invalid.");
+            "The given configuration value is invalid."),
+    /**
+     * 
+     */
+    SP_CONFIGURATION_KEY_INVALID("hawkbit.server.error.configKeyInvalid", "The given configuration key is invalid.");
             
     /**
      * 

hawkbit-core/src/main/java/org/eclipse/hawkbit/exception/SpServerRtException.java

@@ -74,6 +74,10 @@ public abstract class SpServerRtException extends RuntimeException {
         this.error = error;
     }
 
+    /**
+     * 
+     * @return the SpServerError
+     */
     public SpServerError getError() {
         return error;
     }

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/InvalidTenantConfigurationKeyException.java

@@ -0,0 +1,55 @@
+package org.eclipse.hawkbit.tenancy.configuration;
+
+import org.eclipse.hawkbit.exception.SpServerError;
+import org.eclipse.hawkbit.exception.SpServerRtException;
+
+/**
+ * The {@link #InvalidTenantConfigurationKeyException} is thrown when an invalid
+ * configuration key is used.
+ *
+ */
+public class InvalidTenantConfigurationKeyException extends SpServerRtException {
+
+    private static final long serialVersionUID = 1L;
+    private static final SpServerError THIS_ERROR = SpServerError.SP_CONFIGURATION_KEY_INVALID;
+
+    /**
+     * Default constructor.
+     */
+    public InvalidTenantConfigurationKeyException() {
+        super(THIS_ERROR);
+    }
+
+    /**
+     * Parameterized constructor.
+     * 
+     * @param cause
+     *            of the exception
+     */
+    public InvalidTenantConfigurationKeyException(final Throwable cause) {
+        super(THIS_ERROR, cause);
+    }
+
+    /**
+     * Parameterized constructor.
+     * 
+     * @param message
+     *            of the exception
+     * @param cause
+     *            of the exception
+     */
+    public InvalidTenantConfigurationKeyException(final String message, final Throwable cause) {
+        super(message, THIS_ERROR, cause);
+    }
+
+    /**
+     * Parameterized constructor.
+     * 
+     * @param message
+     *            of the exception
+     */
+    public InvalidTenantConfigurationKeyException(final String message) {
+        super(message, THIS_ERROR);
+    }
+
+}

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/TenantConfigurationKey.java

@@ -9,12 +9,13 @@
 package org.eclipse.hawkbit.tenancy.configuration;
 
 import java.util.Arrays;
+import java.util.NoSuchElementException;
 
 import org.eclipse.hawkbit.tenancy.configuration.validator.TenantConfigurationBooleanValidator;
 import org.eclipse.hawkbit.tenancy.configuration.validator.TenantConfigurationPollingDurationValidator;
 import org.eclipse.hawkbit.tenancy.configuration.validator.TenantConfigurationStringValidator;
 import org.eclipse.hawkbit.tenancy.configuration.validator.TenantConfigurationValidator;
-import org.eclipse.hawkbit.tenancy.configuration.validator.exceptions.TenantConfigurationValidatorException;
+import org.eclipse.hawkbit.tenancy.configuration.validator.TenantConfigurationValidatorException;
 import org.springframework.context.ApplicationContext;
 
 /**
@@ -121,7 +122,8 @@ public enum TenantConfigurationKey {
 
     /**
      * 
-     * @return the datatype of the tenant configuration value
+     * @return the data type of the tenant configuration value. (e.g.
+     *         Integer.class, String.class)
      */
     public Class<?> getDataType() {
         return dataType;
@@ -150,9 +152,21 @@ public enum TenantConfigurationKey {
         }
     }
 
-    public static TenantConfigurationKey fromKeyName(final String keyName) {
+    /**
+     * @param keyName
+     *            name of the TenantConfigurationKey
+     * @return the TenantConfigurationKey with the name keyName
+     * @throws InvalidTenantConfigurationKeyException
+     *             if there is no TenantConfigurationKey with the name keyName
+     */
+    public static TenantConfigurationKey fromKeyName(final String keyName)
+            throws InvalidTenantConfigurationKeyException {
 
-        return Arrays.stream(TenantConfigurationKey.values()).filter(conf -> conf.getKeyName().equals(keyName))
-                .findFirst().get();
+        try {
+            return Arrays.stream(TenantConfigurationKey.values()).filter(conf -> conf.getKeyName().equals(keyName))
+                    .findFirst().get();
+        } catch (final NoSuchElementException e) {
+            throw new InvalidTenantConfigurationKeyException("The given configuration key name does not exist.");
+        }
     }
 }

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/validator/TenantConfigurationBooleanValidator.java

@@ -1,7 +1,5 @@
 package org.eclipse.hawkbit.tenancy.configuration.validator;
 
-import org.eclipse.hawkbit.tenancy.configuration.validator.exceptions.TenantConfigurationValidatorException;
-
 /**
  * specific tenant configuration validator, which validates that the given value is a booleans.
  */

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/validator/TenantConfigurationPollingDurationValidator.java

@@ -5,7 +5,6 @@ import java.time.format.DateTimeParseException;
 
 import org.eclipse.hawkbit.ControllerPollProperties;
 import org.eclipse.hawkbit.tenancy.configuration.DurationHelper;
-import org.eclipse.hawkbit.tenancy.configuration.validator.exceptions.TenantConfigurationValidatorException;
 import org.springframework.beans.factory.annotation.Autowired;
 
 /**

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/validator/TenantConfigurationStringValidator.java

@@ -1,7 +1,5 @@
 package org.eclipse.hawkbit.tenancy.configuration.validator;
 
-import org.eclipse.hawkbit.tenancy.configuration.validator.exceptions.TenantConfigurationValidatorException;
-
 /**
  * specific tenant configuration validator, which validates Strings.
  */

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/validator/TenantConfigurationValidator.java

@@ -1,7 +1,5 @@
 package org.eclipse.hawkbit.tenancy.configuration.validator;
 
-import org.eclipse.hawkbit.tenancy.configuration.validator.exceptions.TenantConfigurationValidatorException;
-
 /**
  * base interface for clases which can validate tenant configuration values.
  *

hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/configuration/validator/TenantConfigurationValidatorException.java

@@ -1,4 +1,4 @@
-package org.eclipse.hawkbit.tenancy.configuration.validator.exceptions;
+package org.eclipse.hawkbit.tenancy.configuration.validator;
 
 import org.eclipse.hawkbit.exception.SpServerError;
 import org.eclipse.hawkbit.exception.SpServerRtException;