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/*
* ===============================LICENSE_START======================================
* dcae-analytics
* ================================================================================
* Copyright © 2017 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.apod.analytics.cdap.common.utils;
import org.onap.dcae.apod.analytics.cdap.common.exception.CDAPSettingsException;
import org.onap.dcae.apod.analytics.cdap.common.settings.CDAPAppSettings;
import org.onap.dcae.apod.analytics.cdap.common.validation.CDAPAppSettingsValidator;
import org.onap.dcae.apod.analytics.common.validation.ValidationResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Utility methods to validate null checks, empty string etc
*
* @author Rajiv Singla . Creation Date: 10/24/2016.
*/
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 Validates CDAP App Settings. Throws Runtime exception if validation fails
*
* @param appSettings app Settings e.g. App Config, App Preferences etc
* @param appSettingsValidator app Settings validator
*
* @param <T> Settings type e.g. AppConfig or AppPreferences
* @param <R> Validation Response type
* @param <V> Validator Type
*/
public static <T extends CDAPAppSettings, R extends ValidationResponse,
V extends CDAPAppSettingsValidator<T, R>> void validateSettings(@Nonnull final T appSettings,
@Nonnull final V appSettingsValidator) {
checkNotNull(appSettings, "App Settings must not be null");
checkNotNull(appSettingsValidator, "App Settings validator must not be null");
final String appSettingsClassName = appSettings.getClass().getSimpleName();
final String appSettingsClassValidator = appSettingsValidator.getClass().getSimpleName();
LOG.debug("Validating App Settings for: {}, with App Settings Validator: {} ",
appSettingsClassName, appSettingsClassValidator);
final R validationResponse = appSettingsValidator.validateAppSettings(appSettings);
// If setting validation fails throw an exception
if (validationResponse.hasErrors()) {
throw new CDAPSettingsException(
validationResponse.getAllErrorMessage(), LOG, new IllegalArgumentException());
}
LOG.debug("App Settings Validation Successful for app Settings: {} with validator: {}", appSettingsClassName,
appSettingsClassValidator);
}
}
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