Package org.apache.commons.lang

Class Validate

java.lang.Object
org.apache.commons.lang.Validate
public class Validate extends Object

This class assists in validating arguments.

The class is based along the lines of JUnit. If an argument value is deemed invalid, an IllegalArgumentException is thrown. For example:

 Validate.isTrue( i > 0, "The value must be greater than zero: ", i);
 Validate.notNull( surname, "The surname must not be null");
Since:
2.0
Version:
$Id: Validate.java 1057051 2011-01-09 23:15:51Z sebb $

  • Constructor Summary

    Constructors
    Constructor
    Description
    Validate()
    Constructor.

  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    allElementsOfType(Collection collection, Class clazz)
    Validate an argument, throwing IllegalArgumentException if the argument collection is null or has elements that are not of type clazz or a subclass.
    static void
    allElementsOfType(Collection collection, Class clazz, String message)
    Validate an argument, throwing IllegalArgumentException if the argument collection is null or has elements that are not of type clazz or a subclass.
    static void
    isTrue(boolean expression)
    Validate that the argument condition is true; otherwise throwing an exception.
    static void
    isTrue(boolean expression, String message)
    Validate that the argument condition is true; otherwise throwing an exception with the specified message.
    static void
    isTrue(boolean expression, String message, double value)
    Validate that the argument condition is true; otherwise throwing an exception with the specified message.
    static void
    isTrue(boolean expression, String message, long value)
    Validate that the argument condition is true; otherwise throwing an exception with the specified message.
    static void
    isTrue(boolean expression, String message, Object value)
    Validate that the argument condition is true; otherwise throwing an exception with the specified message.
    static void
    noNullElements(Object[] array)
    Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception.
    static void
    noNullElements(Object[] array, String message)
    Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message.
    static void
    noNullElements(Collection collection)
    Validate that the specified argument collection is neither null nor contains any elements that are null; otherwise throwing an exception.
    static void
    noNullElements(Collection collection, String message)
    Validate that the specified argument collection is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message.
    static void
    notEmpty(Object[] array)
    Validate that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception.
    static void
    notEmpty(Object[] array, String message)
    Validate that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception with the specified message.
    static void
    notEmpty(String string)
    Validate that the specified argument string is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message.
    static void
    notEmpty(String string, String message)
    Validate that the specified argument string is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message.
    static void
    notEmpty(Collection collection)
    Validate that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception.
    static void
    notEmpty(Collection collection, String message)
    Validate that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message.
    static void
    notEmpty(Map map)
    Validate that the specified argument map is neither null nor a size of zero (no elements); otherwise throwing an exception.
    static void
    notEmpty(Map map, String message)
    Validate that the specified argument map is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message.
    static void
    notNull(Object object)
    Validate that the specified argument is not null; otherwise throwing an exception.
    static void
    notNull(Object object, String message)
    Validate that the specified argument is not null; otherwise throwing an exception with the specified message.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Validate

      public Validate()
      Constructor. This class should not normally be instantiated.

  • Method Details

    • isTrue

      public static void isTrue(boolean expression, String message, Object value)

      Validate that the argument condition is true; otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary boolean expression, such as validating an object or using your own custom validation expression.

      Validate.isTrue( myObject.isOk(), "The object is not OK: ", myObject);

      For performance reasons, the object value is passed as a separate parameter and appended to the exception message only in the case of an error.

      Parameters:
      expression - the boolean expression to check
      message - the exception message if invalid
      value - the value to append to the message when invalid
      Throws:
      IllegalArgumentException - if expression is false

    • isTrue

      public static void isTrue(boolean expression, String message, long value)

      Validate that the argument condition is true; otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary boolean expression, such as validating a primitive number or using your own custom validation expression.

      Validate.isTrue(i > 0.0, "The value must be greater than zero: ", i);

      For performance reasons, the long value is passed as a separate parameter and appended to the exception message only in the case of an error.

      Parameters:
      expression - the boolean expression to check
      message - the exception message if invalid
      value - the value to append to the message when invalid
      Throws:
      IllegalArgumentException - if expression is false

    • isTrue

      public static void isTrue(boolean expression, String message, double value)

      Validate that the argument condition is true; otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary boolean expression, such as validating a primitive number or using your own custom validation expression.

      Validate.isTrue(d > 0.0, "The value must be greater than zero: ", d);

      For performance reasons, the double value is passed as a separate parameter and appended to the exception message only in the case of an error.

      Parameters:
      expression - the boolean expression to check
      message - the exception message if invalid
      value - the value to append to the message when invalid
      Throws:
      IllegalArgumentException - if expression is false

    • isTrue

      public static void isTrue(boolean expression, String message)

      Validate that the argument condition is true; otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary boolean expression, such as validating a primitive number or using your own custom validation expression.

       Validate.isTrue( (i > 0), "The value must be greater than zero");
 Validate.isTrue( myObject.isOk(), "The object is not OK");
      Parameters:
      expression - the boolean expression to check
      message - the exception message if invalid
      Throws:
      IllegalArgumentException - if expression is false

    • isTrue

      public static void isTrue(boolean expression)

      Validate that the argument condition is true; otherwise throwing an exception. This method is useful when validating according to an arbitrary boolean expression, such as validating a primitive number or using your own custom validation expression.

       Validate.isTrue(i > 0);
 Validate.isTrue(myObject.isOk());

      The message of the exception is "The validated expression is false".

      Parameters:
      expression - the boolean expression to check
      Throws:
      IllegalArgumentException - if expression is false

    • notNull

      public static void notNull(Object object)

      Validate that the specified argument is not null; otherwise throwing an exception. 

      Validate.notNull(myObject);

      The message of the exception is "The validated object is null".

      Parameters:
      object - the object to check
      Throws:
      IllegalArgumentException - if the object is null

    • notNull

      public static void notNull(Object object, String message)

      Validate that the specified argument is not null; otherwise throwing an exception with the specified message. 

      Validate.notNull(myObject, "The object must not be null");
      Parameters:
      object - the object to check
      message - the exception message if invalid

    • notEmpty

      public static void notEmpty(Object[] array, String message)

      Validate that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception with the specified message. 

      Validate.notEmpty(myArray, "The array must not be empty");
      Parameters:
      array - the array to check
      message - the exception message if invalid
      Throws:
      IllegalArgumentException - if the array is empty

    • notEmpty

      public static void notEmpty(Object[] array)

      Validate that the specified argument array is neither null nor a length of zero (no elements); otherwise throwing an exception. 

      Validate.notEmpty(myArray);

      The message in the exception is "The validated array is empty".

      Parameters:
      array - the array to check
      Throws:
      IllegalArgumentException - if the array is empty

    • notEmpty

      public static void notEmpty(Collection collection, String message)

      Validate that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message. 

      Validate.notEmpty(myCollection, "The collection must not be empty");
      Parameters:
      collection - the collection to check
      message - the exception message if invalid
      Throws:
      IllegalArgumentException - if the collection is empty

    • notEmpty

      public static void notEmpty(Collection collection)

      Validate that the specified argument collection is neither null nor a size of zero (no elements); otherwise throwing an exception. 

      Validate.notEmpty(myCollection);

      The message in the exception is "The validated collection is empty".

      Parameters:
      collection - the collection to check
      Throws:
      IllegalArgumentException - if the collection is empty

    • notEmpty

      public static void notEmpty(Map map, String message)

      Validate that the specified argument map is neither null nor a size of zero (no elements); otherwise throwing an exception with the specified message. 

      Validate.notEmpty(myMap, "The map must not be empty");
      Parameters:
      map - the map to check
      message - the exception message if invalid
      Throws:
      IllegalArgumentException - if the map is empty

    • notEmpty

      public static void notEmpty(Map map)

      Validate that the specified argument map is neither null nor a size of zero (no elements); otherwise throwing an exception. 

      Validate.notEmpty(myMap);

      The message in the exception is "The validated map is empty".

      Parameters:
      map - the map to check
      Throws:
      IllegalArgumentException - if the map is empty
      See Also:

    • notEmpty

      public static void notEmpty(String string, String message)

      Validate that the specified argument string is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message. 

      Validate.notEmpty(myString, "The string must not be empty");
      Parameters:
      string - the string to check
      message - the exception message if invalid
      Throws:
      IllegalArgumentException - if the string is empty

    • notEmpty

      public static void notEmpty(String string)

      Validate that the specified argument string is neither null nor a length of zero (no characters); otherwise throwing an exception with the specified message. 

      Validate.notEmpty(myString);

      The message in the exception is "The validated string is empty".

      Parameters:
      string - the string to check
      Throws:
      IllegalArgumentException - if the string is empty

    • noNullElements

      public static void noNullElements(Object[] array, String message)

      Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message. 

      Validate.noNullElements(myArray, "The array contain null at position %d");

      If the array is null, then the message in the exception is "The validated object is null".

      Parameters:
      array - the array to check
      message - the exception message if the collection has null elements
      Throws:
      IllegalArgumentException - if the array is null or an element in the array is null

    • noNullElements

      public static void noNullElements(Object[] array)

      Validate that the specified argument array is neither null nor contains any elements that are null; otherwise throwing an exception. 

      Validate.noNullElements(myArray);

      If the array is null, then the message in the exception is "The validated object is null".

      If the array has a null element, then the message in the exception is "The validated array contains null element at index: invalid input: '&quot' followed by the index.

      Parameters:
      array - the array to check
      Throws:
      IllegalArgumentException - if the array is null or an element in the array is null

    • noNullElements

      public static void noNullElements(Collection collection, String message)

      Validate that the specified argument collection is neither null nor contains any elements that are null; otherwise throwing an exception with the specified message. 

      Validate.noNullElements(myCollection, "The collection contains null elements");

      If the collection is null, then the message in the exception is "The validated object is null".

      Parameters:
      collection - the collection to check
      message - the exception message if the collection has
      Throws:
      IllegalArgumentException - if the collection is null or an element in the collection is null

    • noNullElements

      public static void noNullElements(Collection collection)

      Validate that the specified argument collection is neither null nor contains any elements that are null; otherwise throwing an exception. 

      Validate.noNullElements(myCollection);

      If the collection is null, then the message in the exception is "The validated object is null".

      If the collection has a null element, then the message in the exception is "The validated collection contains null element at index: invalid input: '&quot' followed by the index.

      Parameters:
      collection - the collection to check
      Throws:
      IllegalArgumentException - if the collection is null or an element in the collection is null

    • allElementsOfType

      public static void allElementsOfType(Collection collection, Class clazz, String message)

      Validate an argument, throwing IllegalArgumentException if the argument collection is null or has elements that are not of type clazz or a subclass.

       Validate.allElementsOfType(collection, String.class, "Collection has invalid elements");
      Parameters:
      collection - the collection to check, not null
      clazz - the Class which the collection's elements are expected to be, not null
      message - the exception message if the Collection has elements not of type clazz
      Since:
      2.1

    • allElementsOfType

      public static void allElementsOfType(Collection collection, Class clazz)

      Validate an argument, throwing IllegalArgumentException if the argument collection is null or has elements that are not of type clazz or a subclass. 

       Validate.allElementsOfType(collection, String.class);

      The message in the exception is 'The validated collection contains an element not of type clazz at index: '.

      Parameters:
      collection - the collection to check, not null
      clazz - the Class which the collection's elements are expected to be, not null
      Since:
      2.1