1 files changed, 108 insertions, 0 deletions
diff --git a/dcae-analytics/dcae-analytics-web/src/main/java/org/onap/dcae/analytics/web/util/ValidationUtils.java b/dcae-analytics/dcae-analytics-web/src/main/java/org/onap/dcae/analytics/web/util/ValidationUtils.java
new file mode 100644
index 0000000..5c734d8
--- /dev/null
+++ b/dcae-analytics/dcae-analytics-web/src/main/java/org/onap/dcae/analytics/web/util/ValidationUtils.java
@@ -0,0 +1,108 @@
+/*
+ * ================================================================================
+ * Copyright (c) 2018 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.dcae.analytics.web.util;
+
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import org.onap.dcae.analytics.web.exception.AnalyticsValidationException;
+import org.onap.dcae.analytics.web.validation.AnalyticsValidator;
+import org.onap.dcae.analytics.web.validation.ValidationResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.util.Assert;
+
+/**
+ * Validation Utilities
+ *
+ * @author Rajiv Singla
+ */
+public abstract class ValidationUtils {
+
+    private static final Logger log = LoggerFactory.getLogger(ValidationUtils.class);
+
+    private ValidationUtils() {
+
+    }
+
+    /**
+     * Checks if String is empty. For null string true is returned
+     *
+     * @param stringValue string value
+     *
+     * @return returns true is string is empty or null
+     */
+    public static boolean isEmpty(@Nullable final String stringValue) {
+        return stringValue == null || stringValue.isEmpty() || stringValue.trim().isEmpty();
+    }
+
+
+    /**
+     * Checks if String value is present. A null, empty, or blank values of string
+     * are considered not present.
+     *
+     * @param stringValue string value to check if it is present or not
+     *
+     * @return true if string value is not null, empty or blank
+     */
+    public static boolean isPresent(@Nullable final String stringValue) {
+        return !isEmpty(stringValue);
+    }
+
+
+    /**
+     * Provides common functionality to validate analytics objects.
+     * Throws {@link AnalyticsValidationException} exception if validation fails
+     *
+     * @param targetObject target object that needs to be validated
+     * @param validator validator that will be used to validate the target object
+     * @param <T> target object type that needs to be validated
+     * @param <R> Validation Response type
+     * @param <V> Validator Type
+     *
+     * @return target object if validation is successful
+     */
+    public static <T, R extends ValidationResponse, V extends AnalyticsValidator<T, R>> T validate(
+            @Nonnull final T targetObject,
+            @Nonnull final V validator) {
+
+        Assert.notNull(targetObject, "target object that needs to validated must not be null");
+        Assert.notNull(validator, "validator must not be null");
+
+        final String targetObjectClass = targetObject.getClass().getSimpleName();
+        final String validatorClass = validator.getClass().getSimpleName();
+
+        log.debug("Validating target object of type: {} with validator type: {} ", targetObjectClass, validatorClass);
+
+        final R validationResponse = validator.apply(targetObject);
+
+        // If setting validation fails throw an exception
+        if (validationResponse.hasErrors()) {
+            throw new AnalyticsValidationException(validationResponse.getAllErrorMessage(),
+                    new IllegalArgumentException(validationResponse.getAllErrorMessage()));
+        }
+
+        log.info("Validation Successful for target object type: {} with validator type: {}", targetObjectClass,
+                validatorClass);
+
+        return targetObject;
+    }
+}