src/java/org/apache/commons/lang/util/Validate.java - platform/external/apache-commons-lang - Git at Google

 /* ====================================================================
  * The Apache Software License, Version 1.1
  *
  * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * 3. The end-user documentation included with the redistribution, if
  *    any, must include the following acknowlegement:
  *       "This product includes software developed by the
  *        Apache Software Foundation (http://www.apache.org/)."
  *    Alternately, this acknowlegement may appear in the software itself,
  *    if and wherever such third-party acknowlegements normally appear.
  *
  * 4. The names "The Jakarta Project", "Commons", and "Apache Software
  *    Foundation" must not be used to endorse or promote products derived
  *    from this software without prior written permission. For written
  *    permission, please contact apache@apache.org.
  *
  * 5. Products derived from this software may not be called "Apache"
  *    nor may "Apache" appear in their names without prior written
  *    permission of the Apache Software Foundation.
  *
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  * ====================================================================
  *
  * This software consists of voluntary contributions made by many
  * individuals on behalf of the Apache Software Foundation.  For more
  * information on the Apache Software Foundation, please see
  * <http://www.apache.org/>.
  */
 package org.apache.commons.lang.util;

 import java.util.Collection;
 import java.util.Iterator;
 import java.util.Map;
 /**
  * <p>Validate is a static utility class for validating arguments.
  *
  * <p>The class is based along the lines of JUnit. If an argument value is
  * deemed invalid, an IllegalArgumentException is thrown. For example:
  *
  * <pre>
  * Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
  * Validate.notNull( surname, "The surname must not be null");
  * </pre>
  *
  * @author <a href="mailto:ola.berg@arkitema.se">Ola Berg</a>
  * @author Stephen Colebourne
  * @since 2.0
  * @version $Id: Validate.java,v 1.3 2003/07/14 22:25:06 bayard Exp $
  */
 public class Validate {

     /**
      * Constructor. This class should not normally be instantiated.
      */
     public Validate() {
     }

     // isTrue
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the test result is <code>false</code>.</p>
      *
      * <p>This is used when validating according to an arbitrary boolean expression,
      * such as validating a primitive number or using your own custom validation
      * expression.</p>
      *
      * <pre>
      * Validate.isTrue( myObject.isOk(), "The object is not OK: ", myObject);
      * </pre>
      *
      * <p>For performance reasons, the object is passed as a separate parameter and
      * appended to the message string only in the case of an error.</p>
      *
      * @param expression  a boolean expression
      * @param message  the exception message you would like to see if the
      *  expression is <code>false</code>
      * @param value  the value to append to the message in case of error
      * @throws IllegalArgumentException if expression is <code>false</code>
      */
     public static void isTrue(boolean expression, String message, Object value) {
         if (expression == false) {
             throw new IllegalArgumentException(message + value);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the test result is <code>false</code>.</p>
      *
      * <p>This is used when validating according to an arbitrary boolean expression,
      * such as validating a primitive number or using your own custom validation
      * expression.</p>
      *
      * <pre>
      * Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
      * </pre>
      *
      * <p>For performance reasons, the object is passed as a separate parameter and
      * appended to the message string only in the case of an error.</p>
      *
      * @param expression  a boolean expression
      * @param message  the exception message you would like to see if the expression is <code>false</code>
      * @param value  the value to append to the message in case of error
      * @throws IllegalArgumentException if expression is <code>false</code>
      */
     public static void isTrue(boolean expression, String message, long value) {
         if (expression == false) {
             throw new IllegalArgumentException(message + value);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the test result is <code>false</code>.</p>
      *
      * <p>This is used when validating according to an arbitrary boolean expression,
      * such as validating a primitive number or using your own custom validation
      * expression.</p>
      *
      * <pre>
      * Validate.isTrue( d > 0.0, "The value must be greater than zero: ", d);
      * </pre>
      *
      * <p>For performance reasons, the object is passed as a separate parameter and
      * appended to the message string only in the case of an error.</p>
      *
      * @param expression  a boolean expression
      * @param message  the exception message you would like to see if the expression
      *  is <code>false</code>
      * @param value  the value to append to the message in case of error
      * @throws IllegalArgumentException if expression is <code>false</code>
      */
     public static void isTrue(boolean expression, String message, double value) {
         if (expression == false) {
             throw new IllegalArgumentException(message + value);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the test result is <code>false</code>.</p>
      *
      * <p>This is used when validating according to an arbitrary boolean expression,
      * such as validating a primitive number or using your own custom validation
      * expression.</p>
      *
      * <pre>
      * Validate.isTrue( (i > 0), "The value must be greater than zero");
      * Validate.isTrue( myObject.isOk(), "The object is not OK");
      * </pre>
      *
      * <p>For performance reasons, the message string should not involve a string append,
      * instead use the {@link #isTrue(boolean, String, Object)} method.</p>
      *
      * @param expression  a boolean expression
      * @param message  the exception message you would like to see if the expression
      *  is <code>false</code>
      * @throws IllegalArgumentException if expression is <code>false</code>
      */
     public static void isTrue(boolean expression, String message) {
         if (expression == false) {
             throw new IllegalArgumentException(message);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the test result is <code>false</code>.</p>
      *
      * <p>This is used when validating according to an arbitrary boolean expression,
      * such as validating a primitive number or using your own custom validation
      * expression.</p>
      *
      * <pre>
      * Validate.isTrue( i > 0 );
      * Validate.isTrue( myObject.isOk() );
      * </pre>
      *
      * <p>The message in the exception is 'The validated expression is false'.</p>
      *
      * @param expression  a boolean expression
      * @throws IllegalArgumentException if expression is <code>false</code>
      */
     public static void isTrue(boolean expression) {
         if (expression == false) {
             throw new IllegalArgumentException("The validated expression is false");
         }
     }

     // notNull
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument is <code>null</code>.</p>
      *
      * <pre>
      * Validate.notNull(myObject, "The object must not be null");
      * </pre>
      *
      * @param object  the object to check is not <code>null</code>
      * @param message  the exception message you would like to see
      *  if the object is <code>null</code>
      * @throws IllegalArgumentException if the object is <code>null</code>
      */
     public static void notNull(Object object, String message) {
         if (object == null) {
             throw new IllegalArgumentException(message);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument is <code>null</code>.</p>
      *
      * <pre>
      * Validate.notNull(myObject);
      * </pre>
      *
      * <p>The message in the exception is 'The validated object is null'.</p>
      *
      * @param object  the object to check is not <code>null</code>
      * @throws IllegalArgumentException if the object is <code>null</code>
      */
     public static void notNull(Object object) {
         if (object == null) {
             throw new IllegalArgumentException("The validated object is null");
         }
     }

     // notEmpty array
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument array is empty (<code>null</code> or no elements).</p>
      *
      * <pre>
      * Validate.notEmpty(myArray, "The array must not be empty");
      * </pre>
      *
      * @param array  the array to check is not empty
      * @param message  the exception message you would like to see if the array is empty
      * @throws IllegalArgumentException if the array is empty
      */
     public static void notEmpty(Object[] array, String message) {
         if (array == null || array.length == 0) {
             throw new IllegalArgumentException(message);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument array is empty (<code>null</code> or no elements).</p>
      *
      * <pre>
      * Validate.notEmpty(myArray);
      * </pre>
      *
      * <p>The message in the exception is 'The validated array is empty'.
      *
      * @param array  the array to check is not empty
      * @throws IllegalArgumentException if the array is empty
      */
     public static void notEmpty(Object[] array) {
         if (array == null || array.length == 0) {
             throw new IllegalArgumentException("The validated array is empty");
         }
     }

     // notEmpty collection
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument Collection is empty (<code>null</code> or no elements).</p>
      *
      * <pre>
      * Validate.notEmpty(myCollection, "The collection must not be empty");
      * </pre>
      *
      * @param collection  the collection to check is not empty
      * @param message  the exception message you would like to see if the collection is empty
      * @throws IllegalArgumentException if the collection is empty
      */
     public static void notEmpty(Collection collection, String message) {
         if (collection == null || collection.size() == 0) {
             throw new IllegalArgumentException(message);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument Collection is empty (<code>null</code> or no elements).</p>
      *
      * <pre>
      * Validate.notEmpty(myCollection);
      * </pre>
      *
      * <p>The message in the exception is 'The validated collection is empty'.</p>
      *
      * @param collection  the collection to check is not empty
      * @throws IllegalArgumentException if the collection is empty
      */
     public static void notEmpty(Collection collection) {
         if (collection == null || collection.size() == 0) {
             throw new IllegalArgumentException("The validated collection is empty");
         }
     }

     // notEmpty map
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument Map is empty (<code>null</code> or no elements).</p>
      *
      * <pre>
      * Validate.notEmpty(myMap, "The collection must not be empty");
      * </pre>
      *
      * @param map  the map to check is not empty
      * @param message  the exception message you would like to see if the map is empty
      * @throws IllegalArgumentException if the map is empty
      */
     public static void notEmpty(Map map, String message) {
         if (map == null || map.size() == 0) {
             throw new IllegalArgumentException(message);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument Map is empty (<code>null</code> or no elements).</p>
      *
      * <pre>
      * Validate.notEmpty(myMap);
      * </pre>
      *
      * <p>The message in the exception is 'The validated map is empty'.</p>
      *
      * @param map  the map to check is not empty
      * @throws IllegalArgumentException if the map is empty
      */
     public static void notEmpty(Map map) {
         if (map == null || map.size() == 0) {
             throw new IllegalArgumentException("The validated map is empty");
         }
     }

     // notEmpty string
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument String is empty (<code>null</code> or zero length).</p>
      *
      * <pre>
      * Validate.notEmpty(myString, "The string must not be empty");
      * </pre>
      *
      * @param string  the string to check is not empty
      * @param message  the exception message you would like to see if the string is empty
      * @throws IllegalArgumentException if the string is empty
      */
     public static void notEmpty(String string, String message) {
         if (string == null || string.length() == 0) {
             throw new IllegalArgumentException(message);
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument String is empty (<code>null</code> or zero length).</p>
      *
      * <pre>
      * Validate.notEmpty(myString);
      * </pre>
      *
      * <p>The message in the exception is 'The validated string is empty'.</p>
      *
      * @param string  the string to check is not empty
      * @throws IllegalArgumentException if the string is empty
      */
     public static void notEmpty(String string) {
         if (string == null || string.length() == 0) {
             throw new IllegalArgumentException("The validated string is empty");
         }
     }

     // notNullElements array
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument array has <code>null</code> elements or is
      * <code>null</code>.</p>
      *
      * <pre>
      * Validate.notEmpty(myArray, "The array must not contain null elements");
      * </pre>
      *
      * @param array  the array to check
      * @param message  the exception message if the array has
      *  <code>null</code> elements
      * @throws IllegalArgumentException if the array has <code>null</code>
      *  elements or is <code>null</code>
      */
     public static void noNullElements(Object[] array, String message) {
         Validate.notNull(array);
         for (int i = 0; i < array.length; i++) {
             if (array[i] == null) {
                 throw new IllegalArgumentException(message);
             }
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument array has <code>null</code> elements or is
      * <code>null</code>.</p>
      *
      * <pre>
      * Validate.notEmpty(myArray);
      * </pre>
      *
      * <p>The message in the exception is 'The validated array contains null element at index: '.</p>
      *
      * @param array  the array to check
      * @throws IllegalArgumentException if the array has <code>null</code>
      *  elements or is <code>null</code>
      */
     public static void noNullElements(Object[] array) {
         Validate.notNull(array);
         for (int i = 0; i < array.length; i++) {
             if (array[i] == null) {
                 throw new IllegalArgumentException("The validated array contains null element at index: " + i);
             }
         }
     }

     // notNullElements collection
     //---------------------------------------------------------------------------------

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument collection has <code>null</code> elements or is
      * <code>null</code>.</p>
      *
      * <pre>
      * Validate.notEmpty(myCollection, "The collection must not contain null elements");
      * </pre>
      *
      * @param collection  the collection to check
      * @param message  the exception message if the array has
      *  <code>null</code> elements
      * @throws IllegalArgumentException if the collection has
      *  <code>null</code> elements or is <code>null</code>
      */
     public static void noNullElements(Collection collection, String message) {
         Validate.notNull(collection);
         int i = 0;
         for (Iterator it = collection.iterator(); it.hasNext(); i++) {
             if (it.next() == null) {
                 throw new IllegalArgumentException(message);
             }
         }
     }

     /**
      * <p>Validate an argument, throwing <code>IllegalArgumentException</code>
      * if the argument collection has <code>null</code> elements or is
      * <code>null</code>.</p>
      *
      * <pre>
      * Validate.notEmpty(myCollection);
      * </pre>
      *
      * <p>The message in the exception is 'The validated collection contains null element at index: '.</p>
      *
      * @param collection  the collection to check
      * @throws IllegalArgumentException if the collection has
      *  <code>null</code> elements or is <code>null</code>
      */
     public static void noNullElements(Collection collection) {
         Validate.notNull(collection);
         int i = 0;
         for (Iterator it = collection.iterator(); it.hasNext(); i++) {
             if (it.next() == null) {
                 throw new IllegalArgumentException("The validated collection contains null element at index: " + i);
             }
         }
     }

 }
	/* ====================================================================
	* The Apache Software License, Version 1.1
	*
	* Copyright (c) 2002-2003 The Apache Software Foundation. All rights
	* reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. The end-user documentation included with the redistribution, if
	* any, must include the following acknowlegement:
	* "This product includes software developed by the
	* Apache Software Foundation (http://www.apache.org/)."
	* Alternately, this acknowlegement may appear in the software itself,
	* if and wherever such third-party acknowlegements normally appear.
	*
	* 4. The names "The Jakarta Project", "Commons", and "Apache Software
	* Foundation" must not be used to endorse or promote products derived
	* from this software without prior written permission. For written
	* permission, please contact apache@apache.org.
	*
	* 5. Products derived from this software may not be called "Apache"
	* nor may "Apache" appear in their names without prior written
	* permission of the Apache Software Foundation.
	*
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	* ====================================================================
	*
	* This software consists of voluntary contributions made by many
	* individuals on behalf of the Apache Software Foundation. For more
	* information on the Apache Software Foundation, please see
	* <http://www.apache.org/>.
	*/
	package org.apache.commons.lang.util;

	import java.util.Collection;
	import java.util.Iterator;
	import java.util.Map;
	/**
	* <p>Validate is a static utility class for validating arguments.
	*
	* <p>The class is based along the lines of JUnit. If an argument value is
	* deemed invalid, an IllegalArgumentException is thrown. For example:
	*
	* <pre>
	* Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
	* Validate.notNull( surname, "The surname must not be null");
	* </pre>
	*
	* @author <a href="mailto:ola.berg@arkitema.se">Ola Berg</a>
	* @author Stephen Colebourne
	* @since 2.0
	* @version $Id: Validate.java,v 1.3 2003/07/14 22:25:06 bayard Exp $
	*/
	public class Validate {

	/**
	* Constructor. This class should not normally be instantiated.
	*/
	public Validate() {
	}

	// isTrue
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the test result is <code>false</code>.</p>
	*
	* <p>This is used when validating according to an arbitrary boolean expression,
	* such as validating a primitive number or using your own custom validation
	* expression.</p>
	*
	* <pre>
	* Validate.isTrue( myObject.isOk(), "The object is not OK: ", myObject);
	* </pre>
	*
	* <p>For performance reasons, the object is passed as a separate parameter and
	* appended to the message string only in the case of an error.</p>
	*
	* @param expression a boolean expression
	* @param message the exception message you would like to see if the
	* expression is <code>false</code>
	* @param value the value to append to the message in case of error
	* @throws IllegalArgumentException if expression is <code>false</code>
	*/
	public static void isTrue(boolean expression, String message, Object value) {
	if (expression == false) {
	throw new IllegalArgumentException(message + value);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the test result is <code>false</code>.</p>
	*
	* <p>This is used when validating according to an arbitrary boolean expression,
	* such as validating a primitive number or using your own custom validation
	* expression.</p>
	*
	* <pre>
	* Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
	* </pre>
	*
	* <p>For performance reasons, the object is passed as a separate parameter and
	* appended to the message string only in the case of an error.</p>
	*
	* @param expression a boolean expression
	* @param message the exception message you would like to see if the expression is <code>false</code>
	* @param value the value to append to the message in case of error
	* @throws IllegalArgumentException if expression is <code>false</code>
	*/
	public static void isTrue(boolean expression, String message, long value) {
	if (expression == false) {
	throw new IllegalArgumentException(message + value);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the test result is <code>false</code>.</p>
	*
	* <p>This is used when validating according to an arbitrary boolean expression,
	* such as validating a primitive number or using your own custom validation
	* expression.</p>
	*
	* <pre>
	* Validate.isTrue( d > 0.0, "The value must be greater than zero: ", d);
	* </pre>
	*
	* <p>For performance reasons, the object is passed as a separate parameter and
	* appended to the message string only in the case of an error.</p>
	*
	* @param expression a boolean expression
	* @param message the exception message you would like to see if the expression
	* is <code>false</code>
	* @param value the value to append to the message in case of error
	* @throws IllegalArgumentException if expression is <code>false</code>
	*/
	public static void isTrue(boolean expression, String message, double value) {
	if (expression == false) {
	throw new IllegalArgumentException(message + value);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the test result is <code>false</code>.</p>
	*
	* <p>This is used when validating according to an arbitrary boolean expression,
	* such as validating a primitive number or using your own custom validation
	* expression.</p>
	*
	* <pre>
	* Validate.isTrue( (i > 0), "The value must be greater than zero");
	* Validate.isTrue( myObject.isOk(), "The object is not OK");
	* </pre>
	*
	* <p>For performance reasons, the message string should not involve a string append,
	* instead use the {@link #isTrue(boolean, String, Object)} method.</p>
	*
	* @param expression a boolean expression
	* @param message the exception message you would like to see if the expression
	* is <code>false</code>
	* @throws IllegalArgumentException if expression is <code>false</code>
	*/
	public static void isTrue(boolean expression, String message) {
	if (expression == false) {
	throw new IllegalArgumentException(message);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the test result is <code>false</code>.</p>
	*
	* <p>This is used when validating according to an arbitrary boolean expression,
	* such as validating a primitive number or using your own custom validation
	* expression.</p>
	*
	* <pre>
	* Validate.isTrue( i > 0 );
	* Validate.isTrue( myObject.isOk() );
	* </pre>
	*
	* <p>The message in the exception is 'The validated expression is false'.</p>
	*
	* @param expression a boolean expression
	* @throws IllegalArgumentException if expression is <code>false</code>
	*/
	public static void isTrue(boolean expression) {
	if (expression == false) {
	throw new IllegalArgumentException("The validated expression is false");
	}
	}

	// notNull
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument is <code>null</code>.</p>
	*
	* <pre>
	* Validate.notNull(myObject, "The object must not be null");
	* </pre>
	*
	* @param object the object to check is not <code>null</code>
	* @param message the exception message you would like to see
	* if the object is <code>null</code>
	* @throws IllegalArgumentException if the object is <code>null</code>
	*/
	public static void notNull(Object object, String message) {
	if (object == null) {
	throw new IllegalArgumentException(message);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument is <code>null</code>.</p>
	*
	* <pre>
	* Validate.notNull(myObject);
	* </pre>
	*
	* <p>The message in the exception is 'The validated object is null'.</p>
	*
	* @param object the object to check is not <code>null</code>
	* @throws IllegalArgumentException if the object is <code>null</code>
	*/
	public static void notNull(Object object) {
	if (object == null) {
	throw new IllegalArgumentException("The validated object is null");
	}
	}

	// notEmpty array
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument array is empty (<code>null</code> or no elements).</p>
	*
	* <pre>
	* Validate.notEmpty(myArray, "The array must not be empty");
	* </pre>
	*
	* @param array the array to check is not empty
	* @param message the exception message you would like to see if the array is empty
	* @throws IllegalArgumentException if the array is empty
	*/
	public static void notEmpty(Object[] array, String message) {
	if (array == null \|\| array.length == 0) {
	throw new IllegalArgumentException(message);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument array is empty (<code>null</code> or no elements).</p>
	*
	* <pre>
	* Validate.notEmpty(myArray);
	* </pre>
	*
	* <p>The message in the exception is 'The validated array is empty'.
	*
	* @param array the array to check is not empty
	* @throws IllegalArgumentException if the array is empty
	*/
	public static void notEmpty(Object[] array) {
	if (array == null \|\| array.length == 0) {
	throw new IllegalArgumentException("The validated array is empty");
	}
	}

	// notEmpty collection
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument Collection is empty (<code>null</code> or no elements).</p>
	*
	* <pre>
	* Validate.notEmpty(myCollection, "The collection must not be empty");
	* </pre>
	*
	* @param collection the collection to check is not empty
	* @param message the exception message you would like to see if the collection is empty
	* @throws IllegalArgumentException if the collection is empty
	*/
	public static void notEmpty(Collection collection, String message) {
	if (collection == null \|\| collection.size() == 0) {
	throw new IllegalArgumentException(message);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument Collection is empty (<code>null</code> or no elements).</p>
	*
	* <pre>
	* Validate.notEmpty(myCollection);
	* </pre>
	*
	* <p>The message in the exception is 'The validated collection is empty'.</p>
	*
	* @param collection the collection to check is not empty
	* @throws IllegalArgumentException if the collection is empty
	*/
	public static void notEmpty(Collection collection) {
	if (collection == null \|\| collection.size() == 0) {
	throw new IllegalArgumentException("The validated collection is empty");
	}
	}

	// notEmpty map
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument Map is empty (<code>null</code> or no elements).</p>
	*
	* <pre>
	* Validate.notEmpty(myMap, "The collection must not be empty");
	* </pre>
	*
	* @param map the map to check is not empty
	* @param message the exception message you would like to see if the map is empty
	* @throws IllegalArgumentException if the map is empty
	*/
	public static void notEmpty(Map map, String message) {
	if (map == null \|\| map.size() == 0) {
	throw new IllegalArgumentException(message);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument Map is empty (<code>null</code> or no elements).</p>
	*
	* <pre>
	* Validate.notEmpty(myMap);
	* </pre>
	*
	* <p>The message in the exception is 'The validated map is empty'.</p>
	*
	* @param map the map to check is not empty
	* @throws IllegalArgumentException if the map is empty
	*/
	public static void notEmpty(Map map) {
	if (map == null \|\| map.size() == 0) {
	throw new IllegalArgumentException("The validated map is empty");
	}
	}

	// notEmpty string
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument String is empty (<code>null</code> or zero length).</p>
	*
	* <pre>
	* Validate.notEmpty(myString, "The string must not be empty");
	* </pre>
	*
	* @param string the string to check is not empty
	* @param message the exception message you would like to see if the string is empty
	* @throws IllegalArgumentException if the string is empty
	*/
	public static void notEmpty(String string, String message) {
	if (string == null \|\| string.length() == 0) {
	throw new IllegalArgumentException(message);
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument String is empty (<code>null</code> or zero length).</p>
	*
	* <pre>
	* Validate.notEmpty(myString);
	* </pre>
	*
	* <p>The message in the exception is 'The validated string is empty'.</p>
	*
	* @param string the string to check is not empty
	* @throws IllegalArgumentException if the string is empty
	*/
	public static void notEmpty(String string) {
	if (string == null \|\| string.length() == 0) {
	throw new IllegalArgumentException("The validated string is empty");
	}
	}

	// notNullElements array
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument array has <code>null</code> elements or is
	* <code>null</code>.</p>
	*
	* <pre>
	* Validate.notEmpty(myArray, "The array must not contain null elements");
	* </pre>
	*
	* @param array the array to check
	* @param message the exception message if the array has
	* <code>null</code> elements
	* @throws IllegalArgumentException if the array has <code>null</code>
	* elements or is <code>null</code>
	*/
	public static void noNullElements(Object[] array, String message) {
	Validate.notNull(array);
	for (int i = 0; i < array.length; i++) {
	if (array[i] == null) {
	throw new IllegalArgumentException(message);
	}
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument array has <code>null</code> elements or is
	* <code>null</code>.</p>
	*
	* <pre>
	* Validate.notEmpty(myArray);
	* </pre>
	*
	* <p>The message in the exception is 'The validated array contains null element at index: '.</p>
	*
	* @param array the array to check
	* @throws IllegalArgumentException if the array has <code>null</code>
	* elements or is <code>null</code>
	*/
	public static void noNullElements(Object[] array) {
	Validate.notNull(array);
	for (int i = 0; i < array.length; i++) {
	if (array[i] == null) {
	throw new IllegalArgumentException("The validated array contains null element at index: " + i);
	}
	}
	}

	// notNullElements collection
	//---------------------------------------------------------------------------------

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument collection has <code>null</code> elements or is
	* <code>null</code>.</p>
	*
	* <pre>
	* Validate.notEmpty(myCollection, "The collection must not contain null elements");
	* </pre>
	*
	* @param collection the collection to check
	* @param message the exception message if the array has
	* <code>null</code> elements
	* @throws IllegalArgumentException if the collection has
	* <code>null</code> elements or is <code>null</code>
	*/
	public static void noNullElements(Collection collection, String message) {
	Validate.notNull(collection);
	int i = 0;
	for (Iterator it = collection.iterator(); it.hasNext(); i++) {
	if (it.next() == null) {
	throw new IllegalArgumentException(message);
	}
	}
	}

	/**
	* <p>Validate an argument, throwing <code>IllegalArgumentException</code>
	* if the argument collection has <code>null</code> elements or is
	* <code>null</code>.</p>
	*
	* <pre>
	* Validate.notEmpty(myCollection);
	* </pre>
	*
	* <p>The message in the exception is 'The validated collection contains null element at index: '.</p>
	*
	* @param collection the collection to check
	* @throws IllegalArgumentException if the collection has
	* <code>null</code> elements or is <code>null</code>
	*/
	public static void noNullElements(Collection collection) {
	Validate.notNull(collection);
	int i = 0;
	for (Iterator it = collection.iterator(); it.hasNext(); i++) {
	if (it.next() == null) {
	throw new IllegalArgumentException("The validated collection contains null element at index: " + i);
	}
	}
	}

	}