Java tutorial
/** * Copyright (c) 2005-2011 springside.org.cn * * Licensed under the Apache License, Version 2.0 (the "License"); * * $Id: Fixtures.java 1593 2011-05-11 10:37:12Z calvinxiu $ */ package com.xdtech.core.orm.utils; import java.util.Collection; import java.util.Map; import org.springframework.util.CollectionUtils; import org.springframework.util.ObjectUtils; import org.springframework.util.StringUtils; /** * Spring Assert, ?org.springframework.util.Assert?, : * * 1. ??, ?org.junit.Assert?. * 2. ?, ?IllegalArgumentException. * * ?: * <pre class="code">AssertUtils.hasText(uName, new IllegalBizArgumentsException(ErrorCode.USERNAME_ERROR));</pre> * * @author badqiu * @author calvin */ public abstract class AssertUtils { /** * Assert a boolean expression, throwing <code>IllegalArgumentException</code> * if the test result is <code>false</code>. * <pre class="code">Assert.isTrue(i > 0);</pre> * @param expression a boolean expression * @throws IllegalArgumentException if expression is <code>false</code> */ public static void isTrue(boolean expression) { isTrue(expression, "[Assertion failed] - this expression must be true"); } /** * Assert a boolean expression, throwing <code>IllegalArgumentException</code> * if the test result is <code>false</code>. * <pre class="code">Assert.isTrue(i > 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 expression is <code>false</code> */ public static void isTrue(boolean expression, String message) { if (!expression) { throw new IllegalArgumentException(message); } } public static void isTrue(boolean expression, RuntimeException throwIfAssertFail) { if (!expression) { throw throwIfAssertFail; } } /** * Assert that an object is <code>null</code> . * <pre class="code">Assert.isNull(value);</pre> * @param object the object to check * @throws IllegalArgumentException if the object is not <code>null</code> */ public static void isNull(Object object) { isNull(object, "[Assertion failed] - the object argument must be null"); } /** * Assert that an object is <code>null</code> . * <pre class="code">Assert.isNull(value, "The value must 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 not <code>null</code> */ public static void isNull(Object object, String message) { if (object != null) { throw new IllegalArgumentException(message); } } public static void isNull(Object object, RuntimeException throwIfAssertFail) { if (object != null) { throw throwIfAssertFail; } } /** * Assert that an object is not <code>null</code> . * <pre class="code">Assert.notNull(clazz);</pre> * @param object the object to check * @throws IllegalArgumentException if the object is <code>null</code> */ public static void notNull(Object object) { notNull(object, "[Assertion failed] - this argument is required; it must not be null"); } /** * Assert that an object is not <code>null</code> . * <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</code> */ public static void notNull(Object object, String message) { if (object == null) { throw new IllegalArgumentException(message); } } public static void notNull(Object object, RuntimeException throwIfAssertFail) { if (object == null) { throw throwIfAssertFail; } } /** * Assert that the given String is not empty; that is, * it must not be <code>null</code> and not the empty String. * <pre class="code">Assert.hasLength(name);</pre> * @param text the String to check * @see StringUtils#hasLength */ public static void hasLength(String text) { hasLength(text, "[Assertion failed] - this String argument must have length; it must not be null or empty"); } /** * Assert that the given String is not empty; that is, * it must not be <code>null</code> and not the empty String. * <pre class="code">Assert.hasLength(name, "Name must not be empty");</pre> * @param text the String to check * @param message the exception message to use if the assertion fails * @see StringUtils#hasLength */ public static void hasLength(String text, String message) { if (!StringUtils.hasLength(text)) { throw new IllegalArgumentException(message); } } public static void hasLength(String text, RuntimeException throwIfAssertFail) { if (!StringUtils.hasLength(text)) { throw throwIfAssertFail; } } /** * Assert that the given String has valid text content; that is, it must not * be <code>null</code> and must contain at least one non-whitespace character. * <pre class="code">Assert.hasText(name, "'name' must not be empty");</pre> * @param text the String to check * @see StringUtils#hasText */ public static void hasText(String text) { hasText(text, "[Assertion failed] - this String argument must have text; it must not be null, empty, or blank"); } /** * Assert that the given String has valid text content; that is, it must not * be <code>null</code> and must contain at least one non-whitespace character. * <pre class="code">Assert.hasText(name, "'name' must not be empty");</pre> * @param text the String to check * @param message the exception message to use if the assertion fails * @see StringUtils#hasText */ public static void hasText(String text, String message) { if (!StringUtils.hasText(text)) { throw new IllegalArgumentException(message); } } public static void hasText(String text, RuntimeException throwIfAssertFail) { if (!StringUtils.hasText(text)) { throw throwIfAssertFail; } } /** * Assert that the given text does not contain the given substring. * <pre class="code">Assert.doesNotContain(name, "rod");</pre> * @param textToSearch the text to search * @param substring the substring to find within the text */ public static void doesNotContain(String textToSearch, String substring) { doesNotContain(textToSearch, substring, "[Assertion failed] - this String argument must not contain the substring [" + substring + "]"); } /** * Assert that the given text does not contain the given substring. * <pre class="code">Assert.doesNotContain(name, "rod", "Name must not contain 'rod'");</pre> * @param textToSearch the text to search * @param substring the substring to find within the text * @param message the exception message to use if the assertion fails */ public static void doesNotContain(String textToSearch, String substring, String message) { if (StringUtils.hasLength(textToSearch) && StringUtils.hasLength(substring) && textToSearch.indexOf(substring) != -1) { throw new IllegalArgumentException(message); } } public static void doesNotContain(String textToSearch, String substring, RuntimeException throwIfAssertFail) { if (StringUtils.hasLength(textToSearch) && StringUtils.hasLength(substring) && textToSearch.indexOf(substring) != -1) { throw throwIfAssertFail; } } /** * Assert that an array has elements; that is, it must not be * <code>null</code> and must have at least one element. * <pre class="code">Assert.notEmpty(array);</pre> * @param array the array to check * @throws IllegalArgumentException if the object array is <code>null</code> or has no elements */ public static void notEmpty(Object[] array) { notEmpty(array, "[Assertion failed] - this array must not be empty: it must contain at least 1 element"); } /** * Assert that an array has elements; that is, it must not be * <code>null</code> and must have at least one element. * <pre class="code">Assert.notEmpty(array, "The array must have elements");</pre> * @param array the array to check * @param message the exception message to use if the assertion fails * @throws IllegalArgumentException if the object array is <code>null</code> or has no elements */ public static void notEmpty(Object[] array, String message) { if (ObjectUtils.isEmpty(array)) { throw new IllegalArgumentException(message); } } public static void notEmpty(Object[] array, RuntimeException throwIfAssertFail) { if (ObjectUtils.isEmpty(array)) { throw throwIfAssertFail; } } /** * Assert that an array has no null elements. * Note: Does not complain if the array is empty! * <pre class="code">Assert.noNullElements(array, "The array must have non-null elements");</pre> * @param array the array to check * @param message the exception message to use if the assertion fails * @throws IllegalArgumentException if the object array contains a <code>null</code> element */ public static void noNullElements(Object[] array, String message) { if (array != null) { for (Object element : array) { if (element == null) { throw new IllegalArgumentException(message); } } } } /** * Assert that an array has no null elements. * Note: Does not complain if the array is empty! * <pre class="code">Assert.noNullElements(array);</pre> * @param array the array to check * @throws IllegalArgumentException if the object array contains a <code>null</code> element */ public static void noNullElements(Object[] array) { noNullElements(array, "[Assertion failed] - this array must not contain any null elements"); } public static void noNullElements(Object[] array, RuntimeException throwIfAssertFail) { if (array != null) { for (Object element : array) { if (element == null) { throw throwIfAssertFail; } } } } /** * Assert that a collection has elements; that is, it must not be * <code>null</code> and must have at least one element. * <pre class="code">Assert.notEmpty(collection, "Collection must have elements");</pre> * @param collection the collection to check * @param message the exception message to use if the assertion fails * @throws IllegalArgumentException if the collection is <code>null</code> or has no elements */ public static void notEmpty(Collection collection, String message) { if (CollectionUtils.isEmpty(collection)) { throw new IllegalArgumentException(message); } } /** * Assert that a collection has elements; that is, it must not be * <code>null</code> and must have at least one element. * <pre class="code">Assert.notEmpty(collection, "Collection must have elements");</pre> * @param collection the collection to check * @throws IllegalArgumentException if the collection is <code>null</code> or has no elements */ public static void notEmpty(Collection collection) { notEmpty(collection, "[Assertion failed] - this collection must not be empty: it must contain at least 1 element"); } public static void notEmpty(Collection collection, RuntimeException throwIfAssertFail) { if (CollectionUtils.isEmpty(collection)) { throw throwIfAssertFail; } } /** * Assert that a Map has entries; that is, it must not be <code>null</code> * and must have at least one entry. * <pre class="code">Assert.notEmpty(map, "Map must have entries");</pre> * @param map the map to check * @param message the exception message to use if the assertion fails * @throws IllegalArgumentException if the map is <code>null</code> or has no entries */ public static void notEmpty(Map map, String message) { if (CollectionUtils.isEmpty(map)) { throw new IllegalArgumentException(message); } } /** * Assert that a Map has entries; that is, it must not be <code>null</code> * and must have at least one entry. * <pre class="code">Assert.notEmpty(map);</pre> * @param map the map to check * @throws IllegalArgumentException if the map is <code>null</code> or has no entries */ public static void notEmpty(Map map) { notEmpty(map, "[Assertion failed] - this map must not be empty; it must contain at least one entry"); } public static void notEmpty(Map map, RuntimeException throwIfAssertFail) { if (CollectionUtils.isEmpty(map)) { throw throwIfAssertFail; } } /** * Assert that the provided object is an instance of the provided class. * <pre class="code">Assert.instanceOf(Foo.class, foo);</pre> * @param type the type to check against * @param obj the object to check * @param message a message which will be prepended to the message produced by * the function itself, and which may be used to provide context. It should * normally end in a ": " or ". " so that the function generate message looks * ok when prepended to it. * @throws IllegalArgumentException if the object is not an instance of clazz * @see Class#isInstance */ public static void isInstanceOf(Class type, Object obj, String message) { notNull(type, "Type to check against must not be null"); if (!type.isInstance(obj)) { throw new IllegalArgumentException(message + "Object of class [" + (obj != null ? obj.getClass().getName() : "null") + "] must be an instance of " + type); } } /** * Assert that the provided object is an instance of the provided class. * <pre class="code">Assert.instanceOf(Foo.class, foo);</pre> * @param clazz the required class * @param obj the object to check * @throws IllegalArgumentException if the object is not an instance of clazz * @see Class#isInstance */ public static void isInstanceOf(Class clazz, Object obj) { isInstanceOf(clazz, obj, ""); } public static void isInstanceOf(Class type, Object obj, RuntimeException throwIfAssertFail) { notNull(type, "Type to check against must not be null"); if (!type.isInstance(obj)) { throw throwIfAssertFail; } } /** * Assert that <code>superType.isAssignableFrom(subType)</code> is <code>true</code>. * <pre class="code">Assert.isAssignable(Number.class, myClass);</pre> * @param superType the super type to check against * @param subType the sub type to check * @param message a message which will be prepended to the message produced by * the function itself, and which may be used to provide context. It should * normally end in a ": " or ". " so that the function generate message looks * ok when prepended to it. * @throws IllegalArgumentException if the classes are not assignable */ public static void isAssignable(Class superType, Class subType, String message) { notNull(superType, "Type to check against must not be null"); if (subType == null || !superType.isAssignableFrom(subType)) { throw new IllegalArgumentException(message + subType + " is not assignable to " + superType); } } /** * Assert that <code>superType.isAssignableFrom(subType)</code> is <code>true</code>. * <pre class="code">Assert.isAssignable(Number.class, myClass);</pre> * @param superType the super type to check * @param subType the sub type to check * @throws IllegalArgumentException if the classes are not assignable */ public static void isAssignable(Class superType, Class subType) { isAssignable(superType, subType, ""); } /** * Assert a boolean expression, throwing <code>IllegalStateException</code> * if the test result is <code>false</code>. Call isTrue if you wish to * throw IllegalArgumentException on an assertion failure. * <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 expression is <code>false</code> */ public static void state(boolean expression, String message) { if (!expression) { throw new IllegalStateException(message); } } /** * Assert a boolean expression, throwing {@link IllegalStateException} * if the test result is <code>false</code>. * <p>Call {@link #isTrue(boolean)} if you wish to * throw {@link IllegalArgumentException} on an assertion failure. * <pre class="code">Assert.state(id == null);</pre> * @param expression a boolean expression * @throws IllegalStateException if the supplied expression is <code>false</code> */ public static void state(boolean expression) { state(expression, "[Assertion failed] - this state invariant must be true"); } }