/*
* 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 ext.test4j.apache.commons.lang;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.test4j.tools.commons.ArrayHelper;
import org.test4j.tools.commons.StringHelper;
/**
* <p>
* Operates on classes without using reflection.
* </p>
*
* <p>
* This class handles invalid <code>null</code> inputs as best it can. Each
* method documents its behaviour in more detail.
* </p>
*
* <p>
* The notion of a <code>canonical name</code> includes the human readable name
* for the type, for example <code>int[]</code>. The non-canonical method
* variants work with the JVM names, such as <code>[I</code>.
* </p>
*
* @author Apache Software Foundation
* @author Gary Gregory
* @author Norm Deane
* @author Alban Peignier
* @author Tomasz Blachowicz
* @since 2.0
* @version $Id: ClassUtils.java 907121 2010-02-05 22:53:21Z mbenson $
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public class ClassUtils {
public static final String EMPTY = "";
/**
* <p>
* The package separator character: <code>'.' == {@value}</code>.
* </p>
*/
public static final char PACKAGE_SEPARATOR_CHAR = '.';
/**
* <p>
* The package separator String: <code>"."</code>.
* </p>
*/
public static final String PACKAGE_SEPARATOR = String.valueOf(PACKAGE_SEPARATOR_CHAR);
/**
* <p>
* The inner class separator character: <code>'$' == {@value}</code>.
* </p>
*/
public static final char INNER_CLASS_SEPARATOR_CHAR = '$';
/**
* <p>
* The inner class separator String: <code>"$"</code>.
* </p>
*/
public static final String INNER_CLASS_SEPARATOR = String.valueOf(INNER_CLASS_SEPARATOR_CHAR);
/**
* Maps primitive <code>Class</code>es to their corresponding wrapper
* <code>Class</code>.
*/
private static final Map primitiveWrapperMap = new HashMap();
static {
primitiveWrapperMap.put(Boolean.TYPE, Boolean.class);
primitiveWrapperMap.put(Byte.TYPE, Byte.class);
primitiveWrapperMap.put(Character.TYPE, Character.class);
primitiveWrapperMap.put(Short.TYPE, Short.class);
primitiveWrapperMap.put(Integer.TYPE, Integer.class);
primitiveWrapperMap.put(Long.TYPE, Long.class);
primitiveWrapperMap.put(Double.TYPE, Double.class);
primitiveWrapperMap.put(Float.TYPE, Float.class);
primitiveWrapperMap.put(Void.TYPE, Void.TYPE);
}
/**
* Maps wrapper <code>Class</code>es to their corresponding primitive types.
*/
private static final Map wrapperPrimitiveMap = new HashMap();
static {
for (Iterator it = primitiveWrapperMap.keySet().iterator(); it.hasNext();) {
Class primitiveClass = (Class) it.next();
Class wrapperClass = (Class) primitiveWrapperMap.get(primitiveClass);
if (!primitiveClass.equals(wrapperClass)) {
wrapperPrimitiveMap.put(wrapperClass, primitiveClass);
}
}
}
/**
* Maps a primitive class name to its corresponding abbreviation used in
* array class names.
*/
private static final Map abbreviationMap = new HashMap();
/**
* Maps an abbreviation used in array class names to corresponding primitive
* class name.
*/
private static final Map reverseAbbreviationMap = new HashMap();
/**
* Add primitive type abbreviation to maps of abbreviations.
*
* @param primitive
* Canonical name of primitive type
* @param abbreviation
* Corresponding abbreviation of primitive type
*/
private static void addAbbreviation(String primitive, String abbreviation) {
abbreviationMap.put(primitive, abbreviation);
reverseAbbreviationMap.put(abbreviation, primitive);
}
/**
* Feed abbreviation maps
*/
static {
addAbbreviation("int", "I");
addAbbreviation("boolean", "Z");
addAbbreviation("float", "F");
addAbbreviation("long", "J");
addAbbreviation("short", "S");
addAbbreviation("byte", "B");
addAbbreviation("double", "D");
addAbbreviation("char", "C");
}
/**
* <p>
* ClassUtils instances should NOT be constructed in standard programming.
* Instead, the class should be used as
* <code>ClassUtils.getShortClassName(cls)</code>.
* </p>
*
* <p>
* This constructor is public to permit tools that require a JavaBean
* instance to operate.
* </p>
*/
public ClassUtils() {
super();
}
// Short class name
// ----------------------------------------------------------------------
/**
* <p>
* Gets the class name minus the package name for an <code>Object</code>.
* </p>
*
* @param object
* the class to get the short name for, may be null
* @param valueIfNull
* the value to return if null
* @return the class name of the object without the package name, or the
* null value
*/
public static String getShortClassName(Object object, String valueIfNull) {
if (object == null) {
return valueIfNull;
}
return getShortClassName(object.getClass());
}
/**
* <p>
* Gets the class name minus the package name from a <code>Class</code>.
* </p>
*
* @param cls
* the class to get the short name for.
* @return the class name without the package name or an empty string
*/
public static String getShortClassName(Class cls) {
if (cls == null) {
return EMPTY;
}
return getShortClassName(cls.getName());
}
/**
* <p>
* Gets the class name minus the package name from a String.
* </p>
*
* <p>
* The string passed in is assumed to be a class name - it is not checked.
* </p>
*
* @param className
* the className to get the short name for
* @return the class name of the class without the package name or an empty
* string
*/
public static String getShortClassName(String className) {
if (className == null) {
return EMPTY;
}
if (className.length() == 0) {
return EMPTY;
}
StringBuffer arrayPrefix = new StringBuffer();
// Handle array encoding
if (className.startsWith("[")) {
while (className.charAt(0) == '[') {
className = className.substring(1);
arrayPrefix.append("[]");
}
// Strip Object type encoding
if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
className = className.substring(1, className.length() - 1);
}
}
if (reverseAbbreviationMap.containsKey(className)) {
className = (String) reverseAbbreviationMap.get(className);
}
int lastDotIdx = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
int innerIdx = className.indexOf(INNER_CLASS_SEPARATOR_CHAR, lastDotIdx == -1 ? 0 : lastDotIdx + 1);
String out = className.substring(lastDotIdx + 1);
if (innerIdx != -1) {
out = out.replace(INNER_CLASS_SEPARATOR_CHAR, PACKAGE_SEPARATOR_CHAR);
}
return out + arrayPrefix;
}
// Package name
// ----------------------------------------------------------------------
/**
* <p>
* Gets the package name of an <code>Object</code>.
* </p>
*
* @param object
* the class to get the package name for, may be null
* @param valueIfNull
* the value to return if null
* @return the package name of the object, or the null value
*/
public static String getPackageName(Object object, String valueIfNull) {
if (object == null) {
return valueIfNull;
}
return getPackageName(object.getClass());
}
/**
* <p>
* Gets the package name of a <code>Class</code>.
* </p>
*
* @param cls
* the class to get the package name for, may be
* <code>null</code>.
* @return the package name or an empty string
*/
public static String getPackageName(Class cls) {
if (cls == null) {
return EMPTY;
}
return getPackageName(cls.getName());
}
/**
* <p>
* Gets the package name from a <code>String</code>.
* </p>
*
* <p>
* The string passed in is assumed to be a class name - it is not checked.
* </p>
* <p>
* If the class is unpackaged, return an empty string.
* </p>
*
* @param className
* the className to get the package name for, may be
* <code>null</code>
* @return the package name or an empty string
*/
public static String getPackageName(String className) {
if (className == null || className.length() == 0) {
return EMPTY;
}
// Strip array encoding
while (className.charAt(0) == '[') {
className = className.substring(1);
}
// Strip Object type encoding
if (className.charAt(0) == 'L' && className.charAt(className.length() - 1) == ';') {
className = className.substring(1);
}
int i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
if (i == -1) {
return EMPTY;
}
return className.substring(0, i);
}
// Superclasses/Superinterfaces
// ----------------------------------------------------------------------
/**
* <p>
* Gets a <code>List</code> of superclasses for the given class.
* </p>
*
* @param cls
* the class to look up, may be <code>null</code>
* @return the <code>List</code> of superclasses in order going up from this
* one <code>null</code> if null input
*/
public static List getAllSuperclasses(Class cls) {
if (cls == null) {
return null;
}
List classes = new ArrayList();
Class superclass = cls.getSuperclass();
while (superclass != null) {
classes.add(superclass);
superclass = superclass.getSuperclass();
}
return classes;
}
/**
* <p>
* Gets a <code>List</code> of all interfaces implemented by the given class
* and its superclasses.
* </p>
*
* <p>
* The order is determined by looking through each interface in turn as
* declared in the source file and following its hierarchy up. Then each
* superclass is considered in the same way. Later duplicates are ignored,
* so the order is maintained.
* </p>
*
* @param cls
* the class to look up, may be <code>null</code>
* @return the <code>List</code> of interfaces in order, <code>null</code>
* if null input
*/
public static List getAllInterfaces(Class cls) {
if (cls == null) {
return null;
}
List interfacesFound = new ArrayList();
getAllInterfaces(cls, interfacesFound);
return interfacesFound;
}
/**
* Get the interfaces for the specified class.
*
* @param cls
* the class to look up, may be <code>null</code>
* @param interfacesFound
* the <code>Set</code> of interfaces for the class
*/
private static void getAllInterfaces(Class cls, List interfacesFound) {
while (cls != null) {
Class[] interfaces = cls.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
if (!interfacesFound.contains(interfaces[i])) {
interfacesFound.add(interfaces[i]);
getAllInterfaces(interfaces[i], interfacesFound);
}
}
cls = cls.getSuperclass();
}
}
// Convert list
// ----------------------------------------------------------------------
/**
* <p>
* Given a <code>List</code> of class names, this method converts them into
* classes.
* </p>
*
* <p>
* A new <code>List</code> is returned. If the class name cannot be found,
* <code>null</code> is stored in the <code>List</code>. If the class name
* in the <code>List</code> is <code>null</code>, <code>null</code> is
* stored in the output <code>List</code>.
* </p>
*
* @param classNames
* the classNames to change
* @return a <code>List</code> of Class objects corresponding to the class
* names, <code>null</code> if null input
* @throws ClassCastException
* if classNames contains a non String entry
*/
public static List convertClassNamesToClasses(List classNames) {
if (classNames == null) {
return null;
}
List classes = new ArrayList(classNames.size());
for (Iterator it = classNames.iterator(); it.hasNext();) {
String className = (String) it.next();
try {
classes.add(Class.forName(className));
} catch (Exception ex) {
classes.add(null);
}
}
return classes;
}
/**
* <p>
* Given a <code>List</code> of <code>Class</code> objects, this method
* converts them into class names.
* </p>
*
* <p>
* A new <code>List</code> is returned. <code>null</code> objects will be
* copied into the returned list as <code>null</code>.
* </p>
*
* @param classes
* the classes to change
* @return a <code>List</code> of class names corresponding to the Class
* objects, <code>null</code> if null input
* @throws ClassCastException
* if <code>classes</code> contains a non-<code>Class</code>
* entry
*/
public static List convertClassesToClassNames(List classes) {
if (classes == null) {
return null;
}
List classNames = new ArrayList(classes.size());
for (Iterator it = classes.iterator(); it.hasNext();) {
Class cls = (Class) it.next();
if (cls == null) {
classNames.add(null);
} else {
classNames.add(cls.getName());
}
}
return classNames;
}
// Is assignable
// ----------------------------------------------------------------------
/**
* <p>
* Checks if an array of Classes can be assigned to another array of
* Classes.
* </p>
*
* <p>
* This method calls {@link #isAssignable(Class, Class) isAssignable} for
* each Class pair in the input arrays. It can be used to check if a set of
* arguments (the first parameter) are suitably compatible with a set of
* method parameter types (the second parameter).
* </p>
*
* <p>
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this
* method takes into account widenings of primitive classes and
* <code>null</code>s.
* </p>
*
* <p>
* Primitive widenings allow an int to be assigned to a <code>long</code>,
* <code>float</code> or <code>double</code>. This method returns the
* correct result for these cases.
* </p>
*
* <p>
* <code>Null</code> may be assigned to any reference type. This method will
* return <code>true</code> if <code>null</code> is passed in and the
* toClass is non-primitive.
* </p>
*
* <p>
* Specifically, this method tests whether the type represented by the
* specified <code>Class</code> parameter can be converted to the type
* represented by this <code>Class</code> object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://java.sun.com/docs/books/jls/">The Java Language Specification</a></em>
* , sections 5.1.1, 5.1.2 and 5.1.4 for details.
* </p>
*
* @param classArray
* the array of Classes to check, may be <code>null</code>
* @param toClassArray
* the array of Classes to try to assign into, may be
* <code>null</code>
* @return <code>true</code> if assignment possible
*/
public static boolean isAssignable(Class[] classArray, Class[] toClassArray) {
return isAssignable(classArray, toClassArray, false);
}
/**
* <p>
* Checks if an array of Classes can be assigned to another array of
* Classes.
* </p>
*
* <p>
* This method calls {@link #isAssignable(Class, Class) isAssignable} for
* each Class pair in the input arrays. It can be used to check if a set of
* arguments (the first parameter) are suitably compatible with a set of
* method parameter types (the second parameter).
* </p>
*
* <p>
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this
* method takes into account widenings of primitive classes and
* <code>null</code>s.
* </p>
*
* <p>
* Primitive widenings allow an int to be assigned to a <code>long</code>,
* <code>float</code> or <code>double</code>. This method returns the
* correct result for these cases.
* </p>
*
* <p>
* <code>Null</code> may be assigned to any reference type. This method will
* return <code>true</code> if <code>null</code> is passed in and the
* toClass is non-primitive.
* </p>
*
* <p>
* Specifically, this method tests whether the type represented by the
* specified <code>Class</code> parameter can be converted to the type
* represented by this <code>Class</code> object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://java.sun.com/docs/books/jls/">The Java Language Specification</a></em>
* , sections 5.1.1, 5.1.2 and 5.1.4 for details.
* </p>
*
* @param classArray
* the array of Classes to check, may be <code>null</code>
* @param toClassArray
* the array of Classes to try to assign into, may be
* <code>null</code>
* @param autoboxing
* whether to use implicit autoboxing/unboxing between primitives
* and wrappers
* @return <code>true</code> if assignment possible
* @since 2.5
*/
public static boolean isAssignable(Class[] classArray, Class[] toClassArray, boolean autoboxing) {
if (ArrayHelper.isSameLength(classArray, toClassArray) == false) {
return false;
}
if (classArray == null) {
classArray = ArrayHelper.EMPTY_CLASS_ARRAY;
}
if (toClassArray == null) {
toClassArray = ArrayHelper.EMPTY_CLASS_ARRAY;
}
for (int i = 0; i < classArray.length; i++) {
if (isAssignable(classArray[i], toClassArray[i], autoboxing) == false) {
return false;
}
}
return true;
}
/**
* <p>
* Checks if one <code>Class</code> can be assigned to a variable of another
* <code>Class</code>.
* </p>
*
* <p>
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this
* method takes into account widenings of primitive classes and
* <code>null</code>s.
* </p>
*
* <p>
* Primitive widenings allow an int to be assigned to a long, float or
* double. This method returns the correct result for these cases.
* </p>
*
* <p>
* <code>Null</code> may be assigned to any reference type. This method will
* return <code>true</code> if <code>null</code> is passed in and the
* toClass is non-primitive.
* </p>
*
* <p>
* Specifically, this method tests whether the type represented by the
* specified <code>Class</code> parameter can be converted to the type
* represented by this <code>Class</code> object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://java.sun.com/docs/books/jls/">The Java Language Specification</a></em>
* , sections 5.1.1, 5.1.2 and 5.1.4 for details.
* </p>
*
* @param cls
* the Class to check, may be null
* @param toClass
* the Class to try to assign into, returns false if null
* @return <code>true</code> if assignment possible
*/
public static boolean isAssignable(Class cls, Class toClass) {
return isAssignable(cls, toClass, false);
}
/**
* <p>
* Checks if one <code>Class</code> can be assigned to a variable of another
* <code>Class</code>.
* </p>
*
* <p>
* Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method, this
* method takes into account widenings of primitive classes and
* <code>null</code>s.
* </p>
*
* <p>
* Primitive widenings allow an int to be assigned to a long, float or
* double. This method returns the correct result for these cases.
* </p>
*
* <p>
* <code>Null</code> may be assigned to any reference type. This method will
* return <code>true</code> if <code>null</code> is passed in and the
* toClass is non-primitive.
* </p>
*
* <p>
* Specifically, this method tests whether the type represented by the
* specified <code>Class</code> parameter can be converted to the type
* represented by this <code>Class</code> object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://java.sun.com/docs/books/jls/">The Java Language Specification</a></em>
* , sections 5.1.1, 5.1.2 and 5.1.4 for details.
* </p>
*
* @param cls
* the Class to check, may be null
* @param toClass
* the Class to try to assign into, returns false if null
* @param autoboxing
* whether to use implicit autoboxing/unboxing between primitives
* and wrappers
* @return <code>true</code> if assignment possible
* @since 2.5
*/
public static boolean isAssignable(Class cls, Class toClass, boolean autoboxing) {
if (toClass == null) {
return false;
}
// have to check for null, as isAssignableFrom doesn't
if (cls == null) {
return !(toClass.isPrimitive());
}
// autoboxing:
if (autoboxing) {
if (cls.isPrimitive() && !toClass.isPrimitive()) {
cls = primitiveToWrapper(cls);
if (cls == null) {
return false;
}
}
if (toClass.isPrimitive() && !cls.isPrimitive()) {
cls = wrapperToPrimitive(cls);
if (cls == null) {
return false;
}
}
}
if (cls.equals(toClass)) {
return true;
}
if (cls.isPrimitive()) {
if (toClass.isPrimitive() == false) {
return false;
}
if (Integer.TYPE.equals(cls)) {
return Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
}
if (Long.TYPE.equals(cls)) {
return Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
}
if (Boolean.TYPE.equals(cls)) {
return false;
}
if (Double.TYPE.equals(cls)) {
return false;
}
if (Float.TYPE.equals(cls)) {
return Double.TYPE.equals(toClass);
}
if (Character.TYPE.equals(cls)) {
return Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass)
|| Double.TYPE.equals(toClass);
}
if (Short.TYPE.equals(cls)) {
return Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass) || Float.TYPE.equals(toClass)
|| Double.TYPE.equals(toClass);
}
if (Byte.TYPE.equals(cls)) {
return Short.TYPE.equals(toClass) || Integer.TYPE.equals(toClass) || Long.TYPE.equals(toClass)
|| Float.TYPE.equals(toClass) || Double.TYPE.equals(toClass);
}
// should never get here
return false;
}
return toClass.isAssignableFrom(cls);
}
/**
* <p>
* Converts the specified primitive Class object to its corresponding
* wrapper Class object.
* </p>
*
* <p>
* NOTE: From v2.2, this method handles <code>Void.TYPE</code>, returning
* <code>Void.TYPE</code>.
* </p>
*
* @param cls
* the class to convert, may be null
* @return the wrapper class for <code>cls</code> or <code>cls</code> if
* <code>cls</code> is not a primitive. <code>null</code> if null
* input.
* @since 2.1
*/
public static Class primitiveToWrapper(Class cls) {
Class convertedClass = cls;
if (cls != null && cls.isPrimitive()) {
convertedClass = (Class) primitiveWrapperMap.get(cls);
}
return convertedClass;
}
/**
* <p>
* Converts the specified array of primitive Class objects to an array of
* its corresponding wrapper Class objects.
* </p>
*
* @param classes
* the class array to convert, may be null or empty
* @return an array which contains for each given class, the wrapper class
* or the original class if class is not a primitive.
* <code>null</code> if null input. Empty array if an empty array
* passed in.
* @since 2.1
*/
public static Class[] primitivesToWrappers(Class[] classes) {
if (classes == null) {
return null;
}
if (classes.length == 0) {
return classes;
}
Class[] convertedClasses = new Class[classes.length];
for (int i = 0; i < classes.length; i++) {
convertedClasses[i] = primitiveToWrapper(classes[i]);
}
return convertedClasses;
}
/**
* <p>
* Converts the specified wrapper class to its corresponding primitive
* class.
* </p>
*
* <p>
* This method is the counter part of <code>primitiveToWrapper()</code>. If
* the passed in class is a wrapper class for a primitive type, this
* primitive type will be returned (e.g. <code>Integer.TYPE</code> for
* <code>Integer.class</code>). For other classes, or if the parameter is
* <b>null</b>, the return value is <b>null</b>.
* </p>
*
* @param cls
* the class to convert, may be <b>null</b>
* @return the corresponding primitive type if <code>cls</code> is a wrapper
* class, <b>null</b> otherwise
* @see #primitiveToWrapper(Class)
* @since 2.4
*/
public static Class wrapperToPrimitive(Class cls) {
return (Class) wrapperPrimitiveMap.get(cls);
}
/**
* <p>
* Converts the specified array of wrapper Class objects to an array of its
* corresponding primitive Class objects.
* </p>
*
* <p>
* This method invokes <code>wrapperToPrimitive()</code> for each element of
* the passed in array.
* </p>
*
* @param classes
* the class array to convert, may be null or empty
* @return an array which contains for each given class, the primitive class
* or <b>null</b> if the original class is not a wrapper class.
* <code>null</code> if null input. Empty array if an empty array
* passed in.
* @see #wrapperToPrimitive(Class)
* @since 2.4
*/
public static Class[] wrappersToPrimitives(Class[] classes) {
if (classes == null) {
return null;
}
if (classes.length == 0) {
return classes;
}
Class[] convertedClasses = new Class[classes.length];
for (int i = 0; i < classes.length; i++) {
convertedClasses[i] = wrapperToPrimitive(classes[i]);
}
return convertedClasses;
}
// Inner class
// ----------------------------------------------------------------------
/**
* <p>
* Is the specified class an inner class or static nested class.
* </p>
*
* @param cls
* the class to check, may be null
* @return <code>true</code> if the class is an inner or static nested
* class, false if not or <code>null</code>
*/
public static boolean isInnerClass(Class cls) {
if (cls == null) {
return false;
}
return cls.getName().indexOf(INNER_CLASS_SEPARATOR_CHAR) >= 0;
}
// Class loading
// ----------------------------------------------------------------------
/**
* Returns the class represented by <code>className</code> using the
* <code>classLoader</code>. This implementation supports names like "
* <code>java.lang.String[]</code>" as well as "
* <code>[Ljava.lang.String;</code>".
*
* @param classLoader
* the class loader to use to load the class
* @param className
* the class name
* @param initialize
* whether the class must be initialized
* @return the class represented by <code>className</code> using the
* <code>classLoader</code>
* @throws ClassNotFoundException
* if the class is not found
*/
public static Class getClass(ClassLoader classLoader, String className, boolean initialize)
throws ClassNotFoundException {
Class clazz;
if (abbreviationMap.containsKey(className)) {
String clsName = "[" + abbreviationMap.get(className);
clazz = Class.forName(clsName, initialize, classLoader).getComponentType();
} else {
clazz = Class.forName(toCanonicalName(className), initialize, classLoader);
}
return clazz;
}
/**
* Returns the (initialized) class represented by <code>className</code>
* using the <code>classLoader</code>. This implementation supports names
* like "<code>java.lang.String[]</code>" as well as "
* <code>[Ljava.lang.String;</code>".
*
* @param classLoader
* the class loader to use to load the class
* @param className
* the class name
* @return the class represented by <code>className</code> using the
* <code>classLoader</code>
* @throws ClassNotFoundException
* if the class is not found
*/
public static Class getClass(ClassLoader classLoader, String className) throws ClassNotFoundException {
return getClass(classLoader, className, true);
}
/**
* Returns the (initialized) class represented by <code>className</code>
* using the current thread's context class loader. This implementation
* supports names like "<code>java.lang.String[]</code>" as well as "
* <code>[Ljava.lang.String;</code>".
*
* @param className
* the class name
* @return the class represented by <code>className</code> using the current
* thread's context class loader
* @throws ClassNotFoundException
* if the class is not found
*/
public static Class getClass(String className) throws ClassNotFoundException {
return getClass(className, true);
}
/**
* Returns the class represented by <code>className</code> using the current
* thread's context class loader. This implementation supports names like "
* <code>java.lang.String[]</code>" as well as "
* <code>[Ljava.lang.String;</code>".
*
* @param className
* the class name
* @param initialize
* whether the class must be initialized
* @return the class represented by <code>className</code> using the current
* thread's context class loader
* @throws ClassNotFoundException
* if the class is not found
*/
public static Class getClass(String className, boolean initialize) throws ClassNotFoundException {
ClassLoader contextCL = Thread.currentThread().getContextClassLoader();
ClassLoader loader = contextCL == null ? ClassUtils.class.getClassLoader() : contextCL;
return getClass(loader, className, initialize);
}
// Public method
// ----------------------------------------------------------------------
/**
* <p>
* Returns the desired Method much like <code>Class.getMethod</code>,
* however it ensures that the returned Method is from a public class or
* interface and not from an anonymous inner class. This means that the
* Method is invokable and doesn't fall foul of Java bug <a
* href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4071957"
* >4071957</a>).
*
* <code><pre>Set set = Collections.unmodifiableSet(...);
* Method method = ClassUtils.getPublicMethod(set.getClass(), "isEmpty", new Class[0]);
* Object result = method.invoke(set, new Object[]);</pre></code>
* </p>
*
* @param cls
* the class to check, not null
* @param methodName
* the name of the method
* @param parameterTypes
* the list of parameters
* @return the method
* @throws NullPointerException
* if the class is null
* @throws SecurityException
* if a a security violation occured
* @throws NoSuchMethodException
* if the method is not found in the given class or if the
* metothod doen't conform with the requirements
*/
public static Method getPublicMethod(Class cls, String methodName, Class parameterTypes[])
throws SecurityException, NoSuchMethodException {
Method declaredMethod = cls.getMethod(methodName, parameterTypes);
if (Modifier.isPublic(declaredMethod.getDeclaringClass().getModifiers())) {
return declaredMethod;
}
List candidateClasses = new ArrayList();
candidateClasses.addAll(getAllInterfaces(cls));
candidateClasses.addAll(getAllSuperclasses(cls));
for (Iterator it = candidateClasses.iterator(); it.hasNext();) {
Class candidateClass = (Class) it.next();
if (!Modifier.isPublic(candidateClass.getModifiers())) {
continue;
}
Method candidateMethod;
try {
candidateMethod = candidateClass.getMethod(methodName, parameterTypes);
} catch (NoSuchMethodException ex) {
continue;
}
if (Modifier.isPublic(candidateMethod.getDeclaringClass().getModifiers())) {
return candidateMethod;
}
}
throw new NoSuchMethodException("Can't find a public method for " + methodName + " "
+ ArrayHelper.toString(parameterTypes));
}
// ----------------------------------------------------------------------
/**
* Converts a class name to a JLS style class name.
*
* @param className
* the class name
* @return the converted name
*/
private static String toCanonicalName(String className) {
className = StringHelper.deleteWhitespace(className);
if (className == null) {
throw new RuntimeException("Argument: className must not be null.");
} else if (className.endsWith("[]")) {
StringBuffer classNameBuffer = new StringBuffer();
while (className.endsWith("[]")) {
className = className.substring(0, className.length() - 2);
classNameBuffer.append("[");
}
String abbreviation = (String) abbreviationMap.get(className);
if (abbreviation != null) {
classNameBuffer.append(abbreviation);
} else {
classNameBuffer.append("L").append(className).append(";");
}
className = classNameBuffer.toString();
}
return className;
}
/**
* <p>
* Converts an array of <code>Object</code> in to an array of
* <code>Class</code> objects. If any of these objects is null, a null
* element will be inserted into the array.
* </p>
*
* <p>
* This method returns <code>null</code> for a <code>null</code> input
* array.
* </p>
*
* @param array
* an <code>Object</code> array
* @return a <code>Class</code> array, <code>null</code> if null array input
* @since 2.4
*/
public static Class[] toClass(Object[] array) {
if (array == null) {
return null;
} else if (array.length == 0) {
return ArrayHelper.EMPTY_CLASS_ARRAY;
}
Class[] classes = new Class[array.length];
for (int i = 0; i < array.length; i++) {
classes[i] = array[i] == null ? null : array[i].getClass();
}
return classes;
}
// Short canonical name
// ----------------------------------------------------------------------
/**
* <p>
* Gets the canonical name minus the package name for an <code>Object</code>
* .
* </p>
*
* @param object
* the class to get the short name for, may be null
* @param valueIfNull
* the value to return if null
* @return the canonical name of the object without the package name, or the
* null value
* @since 2.4
*/
public static String getShortCanonicalName(Object object, String valueIfNull) {
if (object == null) {
return valueIfNull;
}
return getShortCanonicalName(object.getClass().getName());
}
/**
* <p>
* Gets the canonical name minus the package name from a <code>Class</code>.
* </p>
*
* @param cls
* the class to get the short name for.
* @return the canonical name without the package name or an empty string
* @since 2.4
*/
public static String getShortCanonicalName(Class cls) {
if (cls == null) {
return EMPTY;
}
return getShortCanonicalName(cls.getName());
}
/**
* <p>
* Gets the canonical name minus the package name from a String.
* </p>
*
* <p>
* The string passed in is assumed to be a canonical name - it is not
* checked.
* </p>
*
* @param canonicalName
* the class name to get the short name for
* @return the canonical name of the class without the package name or an
* empty string
* @since 2.4
*/
public static String getShortCanonicalName(String canonicalName) {
return ClassUtils.getShortClassName(getCanonicalName(canonicalName));
}
// Package name
// ----------------------------------------------------------------------
/**
* <p>
* Gets the package name from the canonical name of an <code>Object</code>.
* </p>
*
* @param object
* the class to get the package name for, may be null
* @param valueIfNull
* the value to return if null
* @return the package name of the object, or the null value
* @since 2.4
*/
public static String getPackageCanonicalName(Object object, String valueIfNull) {
if (object == null) {
return valueIfNull;
}
return getPackageCanonicalName(object.getClass().getName());
}
/**
* <p>
* Gets the package name from the canonical name of a <code>Class</code>.
* </p>
*
* @param cls
* the class to get the package name for, may be
* <code>null</code>.
* @return the package name or an empty string
* @since 2.4
*/
public static String getPackageCanonicalName(Class cls) {
if (cls == null) {
return EMPTY;
}
return getPackageCanonicalName(cls.getName());
}
/**
* <p>
* Gets the package name from the canonical name.
* </p>
*
* <p>
* The string passed in is assumed to be a canonical name - it is not
* checked.
* </p>
* <p>
* If the class is unpackaged, return an empty string.
* </p>
*
* @param canonicalName
* the canonical name to get the package name for, may be
* <code>null</code>
* @return the package name or an empty string
* @since 2.4
*/
public static String getPackageCanonicalName(String canonicalName) {
return ClassUtils.getPackageName(getCanonicalName(canonicalName));
}
/**
* <p>
* Converts a given name of class into canonical format. If name of class is
* not a name of array class it returns unchanged name.
* </p>
* <p>
* Example:
* <ul>
* <li><code>getCanonicalName("[I") = "int[]"</code></li>
* <li>
* <code>getCanonicalName("[Ljava.lang.String;") = "java.lang.String[]"</code>
* </li>
* <li>
* <code>getCanonicalName("java.lang.String") = "java.lang.String"</code></li>
* </ul>
* </p>
*
* @param className
* the name of class
* @return canonical form of class name
* @since 2.4
*/
private static String getCanonicalName(String className) {
className = StringHelper.deleteWhitespace(className);
if (className == null) {
return null;
} else {
int dim = 0;
while (className.startsWith("[")) {
dim++;
className = className.substring(1);
}
if (dim < 1) {
return className;
} else {
if (className.startsWith("L")) {
className = className.substring(1,
className.endsWith(";") ? className.length() - 1 : className.length());
} else {
if (className.length() > 0) {
className = (String) reverseAbbreviationMap.get(className.substring(0, 1));
}
}
StringBuffer canonicalClassNameBuffer = new StringBuffer(className);
for (int i = 0; i < dim; i++) {
canonicalClassNameBuffer.append("[]");
}
return canonicalClassNameBuffer.toString();
}
}
}
}