From 098c32f1d0ef3922ae19a08dbe2c8f0c12eebfdb Mon Sep 17 00:00:00 2001 From: liamfallon Date: Tue, 26 Feb 2019 22:20:13 +0000 Subject: Assertion class for DAO code This class is used by the DAO model code being moved from the APEX PDP to policy-models for generic DAO handling in the Policy Framework Issue-ID: POLICY-1264 Change-Id: I67cca540d9357f9ab16532090cb2edf397b332be Signed-off-by: liamfallon --- .../policy/common/utils/validation/Assertions.java | 190 +++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 utils/src/main/java/org/onap/policy/common/utils/validation/Assertions.java (limited to 'utils/src/main/java/org') diff --git a/utils/src/main/java/org/onap/policy/common/utils/validation/Assertions.java b/utils/src/main/java/org/onap/policy/common/utils/validation/Assertions.java new file mode 100644 index 00000000..19a25295 --- /dev/null +++ b/utils/src/main/java/org/onap/policy/common/utils/validation/Assertions.java @@ -0,0 +1,190 @@ +/* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * Modifications Copyright (C) 2019 Nordix Foundation. + * ================================================================================ + * 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. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.common.utils.validation; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * The Class Assertions is a static class that is used as a shorthand for assertions in the source code. + * It throws runtime exceptions on assertion fails. + */ +public final class Assertions { + // Logger for this class + private static final Logger LOGGER = LoggerFactory.getLogger(Assertions.class); + + /** + * Private constructor used to prevent sub class instantiation. + */ + private Assertions() { + } + + /** + * Gets the validation message for a string parameter. + * + * @param parameterName the string parameter name + * @param parameterValue the string parameter value + * @param pattern The regular expression + * @return null if the parameter is valid, the validation message otherwise + */ + public static String getStringParameterValidationMessage(final String parameterName, final String parameterValue, + final String pattern) { + try { + validateStringParameter(parameterName, parameterValue, pattern); + } catch (IllegalArgumentException e) { + String message = "parameter " + parameterName + " with value " + parameterValue + + " does not match regular expression " + pattern; + if (LOGGER.isTraceEnabled()) { + LOGGER.trace(message, e); + } + + return message; + } + + return null; + } + + /** + * Checks if a string parameter matches a regular expression. + * + * @param parameterName the string parameter name + * @param parameterValue the string parameter value + * @param pattern The regular expression + * @return the trimmed string + */ + public static String validateStringParameter(final String parameterName, final String parameterValue, + final String pattern) { + argumentNotNull(parameterName, "parameter name is null"); + argumentNotNull(parameterValue, "parameter \"" + parameterName + "\" is null"); + argumentNotNull(pattern, "parameter pattern is null"); + + final String trimmedValue = parameterValue.trim(); + if (trimmedValue.matches(pattern)) { + return trimmedValue; + } else { + throw new IllegalArgumentException("parameter \"" + parameterName + "\": value \"" + parameterValue + + "\", does not match regular expression \"" + pattern + "\""); + } + } + + /** + * Used as a shorthand to check that method arguments are not null, throws IllegalArgumentException on error. + * + * @param the generic type of the argument to check + * @param value the value of the type + * @param message the error message to issue + */ + public static void argumentNotNull(final T value, final String message) { + if (value == null) { + throw new IllegalArgumentException(message); + } + } + + /** + * Used as a shorthand to check that method arguments are not false, throws IllegalArgumentException on error. + * + * @param value the value to check if false + * @param message the error message to issue + */ + public static void argumentNotFalse(final boolean value, final String message) { + if (!value) { + throw new IllegalArgumentException(message); + } + } + + /** + * Used as a shorthand to check that method arguments are not null, throws an exception of the specified type on + * error. + * + * @param the generic type of the argument to check + * @param the exception to throw if incoming value is null + * @param value the value of the type + * @param exceptionClass the class of exception to return an instance of + * @param message the error message to issue + * @throws E an instance of the passed Exception Class + */ + public static void argumentOfClassNotNull(final T value, final Class exceptionClass, + final String message) throws E { + if (value == null) { + // Instantiate the exception and throw it + try { + throw exceptionClass.getConstructor(String.class).newInstance(message); + } catch (final Exception errorException) { + throw new IllegalArgumentException(message, errorException); + } + } + } + + /** + * Used as a shorthand to check that method argument is not false, throws an exception of the specified type on + * error. + * + * @param the exception to throw if incoming value is false + * @param value the value to check if false + * @param exceptionClass the class of exception to return an instance of + * @param message the error message to issue + * @throws E an instance of the passed Exception Class + */ + public static void argumentOfClassNotFalse(final boolean value, final Class exceptionClass, + final String message) throws E { + if (!value) { + // Instantiate the exception and throw it + try { + throw exceptionClass.getConstructor(String.class).newInstance(message); + } catch (final Exception errorException) { + throw new IllegalArgumentException(message, errorException); + } + } + } + + /** + * Used as a shorthand to check that an object is an instance of a given class, throws IllegalArgumentException on + * error. + * + * @param the generic type of the argument to check + * @param objectInstance the object instance for which to check the class + * @param requiredClass the class that the object should be an instance of + * @throws IllegalArgumentException if the incoming object is not an instance of requiredClass + */ + public static void instanceOf(final Object objectInstance, final Class requiredClass) { + if (!requiredClass.isAssignableFrom(objectInstance.getClass())) { + throw new IllegalArgumentException(objectInstance.getClass().getCanonicalName() + " is not an instance of " + + requiredClass.getCanonicalName()); + } + } + + /** + * Used as a shorthand to check that an instance of a class can be an instance of a given class, throws + * IllegalArgumentException on error. + * + * @param the generic type of the argument to check + * @param checkClass the class to check + * @param requiredClass the class that the object should be an instance of + * @throws IllegalArgumentException if the incoming object is not an instance of requiredClass + */ + public static void assignableFrom(final Class checkClass, final Class requiredClass) { + if (!requiredClass.isAssignableFrom(checkClass)) { + throw new IllegalArgumentException(checkClass.getCanonicalName() + " is not an instance of " + + requiredClass.getCanonicalName()); + } + } +} -- cgit 1.2.3-korg