content: /*
   * Copyright 2002-2020 the original author or authors.
   *
   * 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
   *
   *      https://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 org.apache.avro.util.springframework;
  
  import org.apache.avro.reflect.Nullable;
  
  /**
   * Assertion utility class that assists in validating arguments.
   *
   * <p>
   * Useful for identifying programmer errors early and clearly at runtime.
   *
   * <p>
   * For example, if the contract of a public method states it does not allow
   * {@code null} arguments, {@code Assert} can be used to validate that contract.
   * Doing this clearly indicates a contract violation when it occurs and protects
   * the class's invariants.
   *
   * <p>
   * Typically used to validate method arguments rather than configuration
   * properties, to check for cases that are usually programmer errors rather than
   * configuration errors. In contrast to configuration initialization code, there
   * is usually no point in falling back to defaults in such methods.
   *
   * <p>
   * This class is similar to JUnit's assertion library. If an argument value is
   * deemed invalid, an {@link IllegalArgumentException} is thrown (typically).
   * For example:
   * 
   * <pre class="code">
   * Assert.notNull(clazz, "The class must not be null");
   * Assert.isTrue(i &gt; 0, "The value must be greater than zero");
   * </pre>
   *
   * <p>
   * Mainly for internal use within the framework; for a more comprehensive suite
   * of assertion utilities consider {@code org.apache.commons.lang3.Validate}
   * from <a href="https://commons.apache.org/proper/commons-lang/">Apache Commons
   * Lang</a>, Google Guava's <a href=
   * "https://github.com/google/guava/wiki/PreconditionsExplained">Preconditions</a>,
   * or similar third-party libraries.
   *
   * @author Keith Donald
   * @author Juergen Hoeller
   * @author Sam Brannen
   * @author Colin Sampaleanu
   * @author Rob Harrop
   * @since 1.1.2
   */
  class Assert {
    private Assert() {
    }
  
    /**
     * Assert a boolean expression, throwing an {@code IllegalStateException} if the
     * expression evaluates to {@code false}.
     * 
     * <pre class="code">
     * Assert.state(id == null, "The id property must not already be initialized");
     * </pre>
     *
     * @param expression a boolean expression
     * @param message    the exception message to use if the assertion fails
     * @throws IllegalStateException if {@code expression} is {@code false}
     */
    public static void state(boolean expression, String message) {
      if (!expression) {
        throw new IllegalStateException(message);
      }
    }
  
    /**
     * Assert a boolean expression, throwing an {@code IllegalArgumentException} if
     * the expression evaluates to {@code false}.
     * 
     * <pre class="code">
     * Assert.isTrue(i &gt; 0, "The value must be greater than zero");
     * </pre>
     *
     * @param expression a boolean expression
     * @param message    the exception message to use if the assertion fails
     * @throws IllegalArgumentException if {@code expression} is {@code false}
     */
    public static void isTrue(boolean expression, String message) {
      if (!expression) {
        throw new IllegalArgumentException(message);
      }
    }
  
    /**
     * Assert that an object is not {@code null}.
     * 
     * <pre class="code">
     * Assert.notNull(clazz, "The class must not be null");
     * </pre>
     *
     * @param object  the object to check
     * @param message the exception message to use if the assertion fails
     * @throws IllegalArgumentException if the object is {@code null}
     */
    public static void notNull(@Nullable Object object, String message) {
      if (object == null) {
        throw new IllegalArgumentException(message);
      }
    }
  
  }
  