/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 com.skcraft.playblock.util;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
/**
* <p>
* This class assists in validating arguments.
* </p>
*
* <p>
* The class is based along the lines of JUnit. If an argument value is deemed
* invalid, an IllegalArgumentException is thrown. For example:
* </p>
*
* <pre>
* Validate.isTrue(i > 0, "The value must be greater than zero: ", i);
* Validate.notNull(surname, "The surname must not be null");
* </pre>
*
* @author Apache Software Foundation
* @author <a href="mailto:ola.berg@arkitema.se">Ola Berg</a>
* @author Gary Gregory
* @author Norm Deane
* @since 2.0
* @version $Id: Validate.java 1057051 2011-01-09 23:15:51Z sebb $
*/
public class Validate {
// Validate has no dependencies on other classes in Commons Lang at present
/**
* Constructor. This class should not normally be instantiated.
*/
public Validate() {
super();
}
// isTrue
// ---------------------------------------------------------------------------------
/**
* <p>
* Validate that the argument condition is <code>true</code>; 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.
* </p>
*
* <pre>
* Validate.isTrue(myObject.isOk(), "The object is not OK: ", myObject);
* </pre>
*
* <p>
* 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.
* </p>
*
* @param expression
* the boolean expression to check
* @param message
* the exception message if invalid
* @param value
* the value to append to the message when invalid
* @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 that the argument condition is <code>true</code>; 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.
* </p>
*
* <pre>
* Validate.isTrue(i > 0.0, "The value must be greater than zero: ", i);
* </pre>
*
* <p>
* 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.
* </p>
*
* @param expression
* the boolean expression to check
* @param message
* the exception message if invalid
* @param value
* the value to append to the message when invalid
* @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 that the argument condition is <code>true</code>; 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.
* </p>
*
* <pre>
* Validate.isTrue(d > 0.0, "The value must be greater than zero: ", d);
* </pre>
*
* <p>
* 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.
* </p>
*
* @param expression
* the boolean expression to check
* @param message
* the exception message if invalid
* @param value
* the value to append to the message when invalid
* @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 that the argument condition is <code>true</code>; 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.
* </p>
*
* <pre>
* Validate.isTrue((i > 0), "The value must be greater than zero");
* Validate.isTrue(myObject.isOk(), "The object is not OK");
* </pre>
*
* @param expression
* the boolean expression to check
* @param message
* the exception message if invalid
* @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 that the argument condition is <code>true</code>; 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.
* </p>
*
* <pre>
* Validate.isTrue(i > 0);
* Validate.isTrue(myObject.isOk());
* </pre>
*
* <p>
* The message of the exception is "The validated expression is
* false".
* </p>
*
* @param expression
* the boolean expression to check
* @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 that the specified argument is not <code>null</code>; otherwise
* throwing an exception.
*
* <pre>
* Validate.notNull(myObject);
* </pre>
*
* <p>
* The message of the exception is "The validated object is null".
* </p>
*
* @param object
* the object to check
* @throws IllegalArgumentException
* if the object is <code>null</code>
*/
public static void notNull(Object object) {
notNull(object, "The validated object is null");
}
/**
* <p>
* Validate that the specified argument is not <code>null</code>; otherwise
* throwing an exception with the specified message.
*
* <pre>
* Validate.notNull(myObject, "The object must not be null");
* </pre>
*
* @param object
* the object to check
* @param message
* the exception message if invalid
*/
public static void notNull(Object object, String message) {
if (object == null) {
throw new IllegalArgumentException(message);
}
}
// notEmpty array
// ---------------------------------------------------------------------------------
/**
* <p>
* Validate that the specified argument array is neither <code>null</code>
* nor a length of zero (no elements); otherwise throwing an exception with
* the specified message.
*
* <pre>
* Validate.notEmpty(myArray, "The array must not be empty");
* </pre>
*
* @param array
* the array to check
* @param message
* the exception message if invalid
* @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 that the specified argument array is neither <code>null</code>
* nor a length of zero (no elements); otherwise throwing an exception.
*
* <pre>
* Validate.notEmpty(myArray);
* </pre>
*
* <p>
* The message in the exception is "The validated array is empty".
*
* @param array
* the array to check
* @throws IllegalArgumentException
* if the array is empty
*/
public static void notEmpty(Object[] array) {
notEmpty(array, "The validated array is empty");
}
// notEmpty collection
// ---------------------------------------------------------------------------------
/**
* <p>
* Validate that the specified argument collection is neither
* <code>null</code> nor a size of zero (no elements); otherwise throwing an
* exception with the specified message.
*
* <pre>
* Validate.notEmpty(myCollection, "The collection must not be empty");
* </pre>
*
* @param collection
* the collection to check
* @param message
* the exception message if invalid
* @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 that the specified argument collection is neither
* <code>null</code> nor a size of zero (no elements); otherwise throwing an
* exception.
*
* <pre>
* Validate.notEmpty(myCollection);
* </pre>
*
* <p>
* The message in the exception is "The validated collection is
* empty".
* </p>
*
* @param collection
* the collection to check
* @throws IllegalArgumentException
* if the collection is empty
*/
public static void notEmpty(Collection collection) {
notEmpty(collection, "The validated collection is empty");
}
// notEmpty map
// ---------------------------------------------------------------------------------
/**
* <p>
* Validate that the specified argument map is neither <code>null</code> nor
* a size of zero (no elements); otherwise throwing an exception with the
* specified message.
*
* <pre>
* Validate.notEmpty(myMap, "The map must not be empty");
* </pre>
*
* @param map
* the map to check
* @param message
* the exception message if invalid
* @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 that the specified argument map is neither <code>null</code> nor
* a size of zero (no elements); otherwise throwing an exception.
*
* <pre>
* Validate.notEmpty(myMap);
* </pre>
*
* <p>
* The message in the exception is "The validated map is empty".
* </p>
*
* @param map
* the map to check
* @throws IllegalArgumentException
* if the map is empty
* @see #notEmpty(Map, String)
*/
public static void notEmpty(Map map) {
notEmpty(map, "The validated map is empty");
}
// notEmpty string
// ---------------------------------------------------------------------------------
/**
* <p>
* Validate that the specified argument string is neither <code>null</code>
* nor a length of zero (no characters); otherwise throwing an exception
* with the specified message.
*
* <pre>
* Validate.notEmpty(myString, "The string must not be empty");
* </pre>
*
* @param string
* the string to check
* @param message
* the exception message if invalid
* @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 that the specified argument string is neither <code>null</code>
* nor a length of zero (no characters); otherwise throwing an exception
* with the specified message.
*
* <pre>
* Validate.notEmpty(myString);
* </pre>
*
* <p>
* The message in the exception is "The validated string is
* empty".
* </p>
*
* @param string
* the string to check
* @throws IllegalArgumentException
* if the string is empty
*/
public static void notEmpty(String string) {
notEmpty(string, "The validated string is empty");
}
// notNullElements array
// ---------------------------------------------------------------------------------
/**
* <p>
* Validate that the specified argument array is neither <code>null</code>
* nor contains any elements that are <code>null</code>; otherwise throwing
* an exception with the specified message.
*
* <pre>
* Validate.noNullElements(myArray, "The array contain null at position %d");
* </pre>
*
* <p>
* If the array is <code>null</code>, then the message in the exception is
* "The validated object is null".
* </p>
*
* @param array
* the array to check
* @param message
* the exception message if the collection has <code>null</code>
* elements
* @throws IllegalArgumentException
* if the array is <code>null</code> or an element in the array
* 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 that the specified argument array is neither <code>null</code>
* nor contains any elements that are <code>null</code>; otherwise throwing
* an exception.
*
* <pre>
* Validate.noNullElements(myArray);
* </pre>
*
* <p>
* If the array is <code>null</code>, then the message in the exception is
* "The validated object is null".
* </p>
*
* <p>
* If the array has a <code>null</code> element, then the message in the
* exception is "The validated array contains null element at index:
* " followed by the index.
* </p>
*
* @param array
* the array to check
* @throws IllegalArgumentException
* if the array is <code>null</code> or an element in the array
* 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 that the specified argument collection is neither
* <code>null</code> nor contains any elements that are <code>null</code>;
* otherwise throwing an exception with the specified message.
*
* <pre>
* Validate.noNullElements(myCollection, "The collection contains null elements");
* </pre>
*
* <p>
* If the collection is <code>null</code>, then the message in the exception
* is "The validated object is null".
* </p>
*
*
* @param collection
* the collection to check
* @param message
* the exception message if the collection has
* @throws IllegalArgumentException
* if the collection is <code>null</code> or an element in the
* collection is <code>null</code>
*/
public static void noNullElements(Collection collection, String message) {
Validate.notNull(collection);
for (Iterator it = collection.iterator(); it.hasNext();) {
if (it.next() == null) {
throw new IllegalArgumentException(message);
}
}
}
/**
* <p>
* Validate that the specified argument collection is neither
* <code>null</code> nor contains any elements that are <code>null</code>;
* otherwise throwing an exception.
*
* <pre>
* Validate.noNullElements(myCollection);
* </pre>
*
* <p>
* If the collection is <code>null</code>, then the message in the exception
* is "The validated object is null".
* </p>
*
* <p>
* If the collection has a <code>null</code> element, then the message in
* the exception is "The validated collection contains null element at
* index: " followed by the index.
* </p>
*
* @param collection
* the collection to check
* @throws IllegalArgumentException
* if the collection is <code>null</code> or an element in the
* collection 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);
}
}
}
/**
* <p>
* Validate an argument, throwing <code>IllegalArgumentException</code> if
* the argument collection is <code>null</code> or has elements that are not
* of type <code>clazz</code> or a subclass.
* </p>
*
* <pre>
* Validate.allElementsOfType(collection, String.class, "Collection has invalid elements");
* </pre>
*
* @param collection
* the collection to check, not null
* @param clazz
* the <code>Class</code> which the collection's elements are
* expected to be, not null
* @param message
* the exception message if the <code>Collection</code> has
* elements not of type <code>clazz</code>
* @since 2.1
*/
public static void allElementsOfType(Collection collection, Class clazz, String message) {
Validate.notNull(collection);
Validate.notNull(clazz);
for (Iterator it = collection.iterator(); it.hasNext();) {
if (clazz.isInstance(it.next()) == false) {
throw new IllegalArgumentException(message);
}
}
}
/**
* <p>
* Validate an argument, throwing <code>IllegalArgumentException</code> if
* the argument collection is <code>null</code> or has elements that are not
* of type <code>clazz</code> or a subclass.
* </p>
*
* <pre>
* Validate.allElementsOfType(collection, String.class);
* </pre>
*
* <p>
* The message in the exception is 'The validated collection contains an
* element not of type clazz at index: '.
* </p>
*
* @param collection
* the collection to check, not null
* @param clazz
* the <code>Class</code> which the collection's elements are
* expected to be, not null
* @since 2.1
*/
public static void allElementsOfType(Collection collection, Class clazz) {
Validate.notNull(collection);
Validate.notNull(clazz);
int i = 0;
for (Iterator it = collection.iterator(); it.hasNext(); i++) {
if (clazz.isInstance(it.next()) == false) {
throw new IllegalArgumentException("The validated collection contains an element not of type " + clazz.getName() + " at index: " + i);
}
}
}
}