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API for Mule Runtime

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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.runtime.api.util;

/**
 * 
 * Utility class to validate Preconditions
 * 
 */
public class Preconditions {

  /**
   * @param condition Condition that the argument must satisfy
   * @param message The Message of the exception in case the condition is invalid
   */
  public static void checkArgument(boolean condition, String message) {
    if (!condition) {
      throw new IllegalArgumentException(message);
    }
  }

  /**
   * @param condition Condition that must be satisfied
   * @param message The Message of the exception in case the condition is invalid
   */
  public static void checkState(boolean condition, String message) {
    if (!condition) {
      throw new IllegalStateException(message);
    }
  }

  /**
   * Ensures that an object reference passed as a parameter to the calling method is not null.
   *
   * @param reference an object reference
   * @param errorMessage the exception message to use if the check fails
   * @return the non-null reference that was validated
   * @throws NullPointerException if {@code reference} is null
   */
  public static  T checkNotNull(T reference, String errorMessage) {
    if (reference == null) {
      throw new NullPointerException(errorMessage);
    }
    return reference;
  }

}