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/*
* ================================================================================
* 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;
}
}
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