| /* |
| * 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 org.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; |
| |
| |
| /** |
| * <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> |
| * |
| * @author Stephen Colebourne |
| * @author Gary Gregory |
| * @author Norm Deane |
| * @author Alban Peignier |
| * @author Tomasz Blachowicz |
| * @since 2.0 |
| * @version $Id$ |
| */ |
| public class ClassUtils { |
| |
| /** |
| * <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 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 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 Map abbreviationMap = new HashMap(); |
| |
| /** |
| * Maps an abbreviation used in array class names to corresponding primitive class name. |
| */ |
| private static 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().getName()); |
| } |
| |
| /** |
| * <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 StringUtils.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 StringUtils.EMPTY; |
| } |
| if (className.length() == 0) { |
| return StringUtils.EMPTY; |
| } |
| |
| 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; |
| } |
| |
| // 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().getName()); |
| } |
| |
| /** |
| * <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 StringUtils.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) { |
| return StringUtils.EMPTY; |
| } |
| int i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR); |
| if (i == -1) { |
| return StringUtils.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 list = new ArrayList(); |
| while (cls != null) { |
| Class[] interfaces = cls.getInterfaces(); |
| for (int i = 0; i < interfaces.length; i++) { |
| if (list.contains(interfaces[i]) == false) { |
| list.add(interfaces[i]); |
| } |
| List superInterfaces = getAllInterfaces(interfaces[i]); |
| for (Iterator it = superInterfaces.iterator(); it.hasNext();) { |
| Class intface = (Class) it.next(); |
| if (list.contains(intface) == false) { |
| list.add(intface); |
| } |
| } |
| } |
| cls = cls.getSuperclass(); |
| } |
| return list; |
| } |
| |
| // 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 |
| */ |
| public static boolean isAssignable(Class[] classArray, Class[] toClassArray, boolean autoboxing) { |
| if (ArrayUtils.isSameLength(classArray, toClassArray) == false) { |
| return false; |
| } |
| if (classArray == null) { |
| classArray = ArrayUtils.EMPTY_CLASS_ARRAY; |
| } |
| if (toClassArray == null) { |
| toClassArray = ArrayUtils.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 |
| */ |
| 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 + " " + ArrayUtils.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 = StringUtils.deleteWhitespace(className); |
| if (className == null) { |
| throw new NullArgumentException("className"); |
| } 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.</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 ArrayUtils.EMPTY_CLASS_ARRAY; |
| } |
| Class[] classes = new Class[array.length]; |
| for (int i = 0; i < array.length; i++) { |
| classes[i] = 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 StringUtils.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 StringUtils.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 = StringUtils.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(); |
| } |
| } |
| } |
| } |
