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Assert.java
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/*
* Copyright 2019-2020 OpenFeign Contributors
*
* 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.
*/
package feign.support;
import java.util.Collection;
import java.util.function.Predicate;
/**
* Helper Class that provides useful Assertions.
*/
public final class Assert {
/**
* Ensures that the provided value is not {@literal null}.
*
* @param value to evaluate.
* @param message to include in the thrown exception.
* @throws IllegalArgumentException if the value is {@literal null}.
*/
public static void isNotNull(Object value, String message) {
if (value == null) {
throw new IllegalArgumentException(message);
}
}
/**
* Ensures that the provided value is not empty. Strings that are all whitespace are also
* considered empty.
*
* @param value to evaluate.
* @param message to include in the thrown exception.
* @throws IllegalArgumentException if the value is {@literal null}, empty, or all whitespace.
*/
public static void isNotEmpty(String value, String message) {
if (value == null || value.trim().isEmpty()) {
throw new IllegalArgumentException(message);
}
}
/**
* Ensures that the provided collection is not empty.
*
* @param value to evaluate.
* @param message to include in the thrown exception.
* @throws IllegalArgumentException if the value is {@literal null} or empty.
*/
public static void isNotEmpty(Collection<?> value, String message) {
if (value == null || value.isEmpty()) {
throw new IllegalArgumentException(message);
}
}
/**
* Ensures that the value provided matches the supplied expression.
*
* @param value to evaluate.
* @param expression to use to evaluate the value.
* @param message to include in the thrown exception.
* @param <T> type of the value.
* @throws IllegalStateException if the value does not pass the expression.
*/
public static <T> void isTrue(T value, Predicate<T> expression, String message) {
if (!expression.test(value)) {
throw new IllegalStateException(message);
}
}
/**
* Ensures that the value provided does not match the supplied expression.
*
* @param value to evaluate.
* @param expression to use to evaluate the value.
* @param message to include in the thrown exception.
* @param <T> type of the value.
* @throws IllegalStateException if the value does pass the expression.
*/
public static <T> void isFalse(T value, Predicate<T> expression, String message) {
isTrue(value, expression.negate(), message);
}
}