/
ClassUtils.java
1563 lines (1461 loc) · 63.6 KB
/
ClassUtils.java
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/*
* 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.lang3;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.lang3.mutable.MutableObject;
/**
* <p>Operates on classes without using reflection.</p>
*
* <p>This class handles invalid {@code null} inputs as best it can.
* Each method documents its behavior in more detail.</p>
*
* <p>The notion of a {@code canonical name} includes the human
* readable name for the type, for example {@code int[]}. The
* non-canonical method variants work with the JVM names, such as
* {@code [I}. </p>
*
* @since 2.0
*/
public class ClassUtils {
/**
* Inclusivity literals for {@link #hierarchy(Class, Interfaces)}.
* @since 3.2
*/
public enum Interfaces {
/** Includes interfaces. */
INCLUDE,
/** Excludes interfaces. */
EXCLUDE
}
/**
* The package separator character: {@code '.' == {@value}}.
*/
public static final char PACKAGE_SEPARATOR_CHAR = '.';
/**
* The package separator String: {@code "."}.
*/
public static final String PACKAGE_SEPARATOR = String.valueOf(PACKAGE_SEPARATOR_CHAR);
/**
* The inner class separator character: {@code '$' == {@value}}.
*/
public static final char INNER_CLASS_SEPARATOR_CHAR = '$';
/**
* The inner class separator String: {@code "$"}.
*/
public static final String INNER_CLASS_SEPARATOR = String.valueOf(INNER_CLASS_SEPARATOR_CHAR);
/**
* Maps names of primitives to their corresponding primitive {@code Class}es.
*/
private static final Map<String, Class<?>> namePrimitiveMap = new HashMap<>();
static {
namePrimitiveMap.put("boolean", Boolean.TYPE);
namePrimitiveMap.put("byte", Byte.TYPE);
namePrimitiveMap.put("char", Character.TYPE);
namePrimitiveMap.put("short", Short.TYPE);
namePrimitiveMap.put("int", Integer.TYPE);
namePrimitiveMap.put("long", Long.TYPE);
namePrimitiveMap.put("double", Double.TYPE);
namePrimitiveMap.put("float", Float.TYPE);
namePrimitiveMap.put("void", Void.TYPE);
}
/**
* Maps primitive {@code Class}es to their corresponding wrapper {@code Class}.
*/
private static final Map<Class<?>, Class<?>> 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}es to their corresponding primitive types.
*/
private static final Map<Class<?>, Class<?>> wrapperPrimitiveMap = new HashMap<>();
static {
for (final Map.Entry<Class<?>, Class<?>> entry : primitiveWrapperMap.entrySet()) {
final Class<?> primitiveClass = entry.getKey();
final Class<?> wrapperClass = entry.getValue();
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<String, String> abbreviationMap;
/**
* Maps an abbreviation used in array class names to corresponding primitive class name.
*/
private static final Map<String, String> reverseAbbreviationMap;
// Feed abbreviation maps
static {
final Map<String, String> m = new HashMap<>();
m.put("int", "I");
m.put("boolean", "Z");
m.put("float", "F");
m.put("long", "J");
m.put("short", "S");
m.put("byte", "B");
m.put("double", "D");
m.put("char", "C");
final Map<String, String> r = new HashMap<>();
for (final Map.Entry<String, String> e : m.entrySet()) {
r.put(e.getValue(), e.getKey());
}
abbreviationMap = Collections.unmodifiableMap(m);
reverseAbbreviationMap = Collections.unmodifiableMap(r);
}
/**
* <p>ClassUtils instances should NOT be constructed in standard programming.
* Instead, the class should be used as
* {@code ClassUtils.getShortClassName(cls)}.</p>
*
* <p>This constructor is public to permit tools that require a JavaBean
* instance to operate.</p>
*/
public ClassUtils() {
}
// Short class name
// ----------------------------------------------------------------------
/**
* <p>Gets the class name of the {@code object} without the package name or names.</p>
*
* <p>The method looks up the class of the object and then converts the name of the class invoking
* {@link #getShortClassName(Class)} (see relevant notes there).</p>
*
* @param object the class to get the short name for, may be {@code null}
* @param valueIfNull the value to return if the object is {@code null}
* @return the class name of the object without the package name, or {@code valueIfNull}
* if the argument {@code object} is {@code null}
*/
public static String getShortClassName(final Object object, final String valueIfNull) {
if (object == null) {
return valueIfNull;
}
return getShortClassName(object.getClass());
}
/**
* <p>Gets the class name minus the package name from a {@code Class}.</p>
*
* <p>This method simply gets the name using {@code Class.getName()} and then calls
* {@link #getShortClassName(Class)}. See relevant notes there.</p>
*
* @param cls the class to get the short name for.
* @return the class name without the package name or an empty string. If the class
* is an inner class then the returned value will contain the outer class
* or classes separated with {@code .} (dot) character.
*/
public static String getShortClassName(final 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. The string has to be formatted the way
* as the JDK method {@code Class.getName()} returns it, and not the usual way as we write it, for example in import
* statements, or as it is formatted by {@code Class.getCanonicalName()}.</p>
*
* <p>The difference is is significant only in case of classes that are inner classes of some other
* classes. In this case the separator between the outer and inner class (possibly on multiple hierarchy level) has
* to be {@code $} (dollar sign) and not {@code .} (dot), as it is returned by {@code Class.getName()}</p>
*
* <p>Note that this method is called from the {@link #getShortClassName(Class)} method using the string
* returned by {@code Class.getName()}.</p>
*
* <p>Note that this method differs from {@link #getSimpleName(Class)} in that this will
* return, for example {@code "Map.Entry"} whilst the {@code java.lang.Class} variant will simply
* return {@code "Entry"}. In this example the argument {@code className} is the string
* {@code java.util.Map$Entry} (note the {@code $} sign.</p>
*
* @param className the className to get the short name for. It has to be formatted as returned by
* {@code Class.getName()} and not {@code Class.getCanonicalName()}
* @return the class name of the class without the package name or an empty string. If the class is
* an inner class then value contains the outer class or classes and the separator is replaced
* to be {@code .} (dot) character.
*/
public static String getShortClassName(String className) {
if (StringUtils.isEmpty(className)) {
return StringUtils.EMPTY;
}
final StringBuilder arrayPrefix = new StringBuilder();
// 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 = reverseAbbreviationMap.get(className);
}
}
final int lastDotIdx = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
final 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;
}
/**
* <p>Null-safe version of {@code cls.getSimpleName()}</p>
*
* @param cls the class for which to get the simple name; may be null
* @return the simple class name or the empty string in case the argument is {@code null}
* @since 3.0
* @see Class#getSimpleName()
*/
public static String getSimpleName(final Class<?> cls) {
return getSimpleName(cls, StringUtils.EMPTY);
}
/**
* <p>Null-safe version of {@code cls.getSimpleName()}</p>
*
* @param cls the class for which to get the simple name; may be null
* @param valueIfNull the value to return if null
* @return the simple class name or {@code valueIfNull} if the
* argument {@code cls} is {@code null}
* @since 3.0
* @see Class#getSimpleName()
*/
public static String getSimpleName(final Class<?> cls, final String valueIfNull) {
return cls == null ? valueIfNull : cls.getSimpleName();
}
/**
* <p>Null-safe version of {@code object.getClass().getSimpleName()}</p>
*
* <p>It is to note that this method is overloaded and in case the argument {@code object} is a
* {@code Class} object then the {@link #getSimpleName(Class)} will be invoked. If this is
* a significant possibility then the caller should check this case and call {@code
* getSimpleName(Class.class)} or just simply use the string literal {@code "Class"}, which
* is the result of the method in that case.</p>
*
* @param object the object for which to get the simple class name; may be null
* @return the simple class name or the empty string in case the argument is {@code null}
* @since 3.7
* @see Class#getSimpleName()
*/
public static String getSimpleName(final Object object) {
return getSimpleName(object, StringUtils.EMPTY);
}
/**
* <p>Null-safe version of {@code object.getClass().getSimpleName()}</p>
*
* @param object the object for which to get the simple class name; may be null
* @param valueIfNull the value to return if {@code object} is {@code null}
* @return the simple class name or {@code valueIfNull} if the
* argument {@code object} is {@code null}
* @since 3.0
* @see Class#getSimpleName()
*/
public static String getSimpleName(final Object object, final String valueIfNull) {
return object == null ? valueIfNull : object.getClass().getSimpleName();
}
/**
* <p>Null-safe version of {@code cls.getName()}</p>
*
* @param cls the class for which to get the class name; may be null
* @return the class name or the empty string in case the argument is {@code null}
* @since 3.7
* @see Class#getSimpleName()
*/
public static String getName(final Class<?> cls) {
return getName(cls, StringUtils.EMPTY);
}
/**
* <p>Null-safe version of {@code cls.getName()}</p>
*
* @param cls the class for which to get the class name; may be null
* @param valueIfNull the return value if the argument {@code cls} is {@code null}
* @return the class name or {@code valueIfNull}
* @since 3.7
* @see Class#getName()
*/
public static String getName(final Class<?> cls, final String valueIfNull) {
return cls == null ? valueIfNull : cls.getName();
}
/**
* <p>Null-safe version of {@code object.getClass().getName()}</p>
*
* @param object the object for which to get the class name; may be null
* @return the class name or the empty String
* @since 3.7
* @see Class#getSimpleName()
*/
public static String getName(final Object object) {
return getName(object, StringUtils.EMPTY);
}
/**
* <p>Null-safe version of {@code object.getClass().getSimpleName()}</p>
*
* @param object the object for which to get the class name; may be null
* @param valueIfNull the value to return if {@code object} is {@code null}
* @return the class name or {@code valueIfNull}
* @since 3.0
* @see Class#getName()
*/
public static String getName(final Object object, final String valueIfNull) {
return object == null ? valueIfNull : object.getClass().getName();
}
// Package name
// ----------------------------------------------------------------------
/**
* <p>Gets the package name of an {@code Object}.</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(final Object object, final String valueIfNull) {
if (object == null) {
return valueIfNull;
}
return getPackageName(object.getClass());
}
/**
* <p>Gets the package name of a {@code Class}.</p>
*
* @param cls the class to get the package name for, may be {@code null}.
* @return the package name or an empty string
*/
public static String getPackageName(final Class<?> cls) {
if (cls == null) {
return StringUtils.EMPTY;
}
return getPackageName(cls.getName());
}
/**
* <p>Gets the package name from a {@code String}.</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}
* @return the package name or an empty string
*/
public static String getPackageName(String className) {
if (StringUtils.isEmpty(className)) {
return StringUtils.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);
}
final int i = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
if (i == -1) {
return StringUtils.EMPTY;
}
return className.substring(0, i);
}
// Abbreviated name
// ----------------------------------------------------------------------
/**
* <p>Gets the abbreviated name of a {@code Class}.</p>
*
* @param cls the class to get the abbreviated name for, may be {@code null}
* @param lengthHint the desired length of the abbreviated name
* @return the abbreviated name or an empty string
* @throws IllegalArgumentException if len <= 0
* @see #getAbbreviatedName(String, int)
* @since 3.4
*/
public static String getAbbreviatedName(final Class<?> cls, final int lengthHint) {
if (cls == null) {
return StringUtils.EMPTY;
}
return getAbbreviatedName(cls.getName(), lengthHint);
}
/**
* <p>Gets the abbreviated class name from a {@code String}.</p>
*
* <p>The string passed in is assumed to be a class name - it is not checked.</p>
*
* <p>The abbreviation algorithm will shorten the class name, usually without
* significant loss of meaning.</p>
*
* <p>The abbreviated class name will always include the complete package hierarchy.
* If enough space is available, rightmost sub-packages will be displayed in full
* length. The abbreviated package names will be shortened to a single character.</p>
* <p>Only package names are shortened, the class simple name remains untouched. (See examples.)</p>
* <p>The result will be longer than the desired length only if all the package names
* shortened to a single character plus the class simple name with the separating dots
* together are longer than the desired length. In other words, when the class name
* cannot be shortened to the desired length.</p>
* <p>If the class name can be shortened then
* the final length will be at most {@code lengthHint} characters.</p>
* <p>If the {@code lengthHint} is zero or negative then the method
* throws exception. If you want to achieve the shortest possible version then
* use {@code 1} as a {@code lengthHint}.</p>
*
* <table>
* <caption>Examples</caption>
* <tr><td>className</td><td>len</td><td>return</td></tr>
* <tr><td> null</td><td> 1</td><td>""</td></tr>
* <tr><td>"java.lang.String"</td><td> 5</td><td>"j.l.String"</td></tr>
* <tr><td>"java.lang.String"</td><td>15</td><td>"j.lang.String"</td></tr>
* <tr><td>"java.lang.String"</td><td>30</td><td>"java.lang.String"</td></tr>
* <tr><td>"org.apache.commons.lang3.ClassUtils"</td><td>18</td><td>"o.a.c.l.ClassUtils"</td></tr>
* </table>
*
* @param className the className to get the abbreviated name for, may be {@code null}
* @param lengthHint the desired length of the abbreviated name
* @return the abbreviated name or an empty string if the specified
* class name is {@code null} or empty string. The abbreviated name may be
* longer than the desired length if it cannot be abbreviated to the desired length.
* @throws IllegalArgumentException if {@code len <= 0}
* @since 3.4
*/
public static String getAbbreviatedName(final String className, final int lengthHint) {
if (lengthHint <= 0) {
throw new IllegalArgumentException("len must be > 0");
}
if (className == null) {
return StringUtils.EMPTY;
}
if (className.length() <= lengthHint) {
return className;
}
final char[] abbreviated = className.toCharArray();
int target = 0;
int source = 0;
while (source < abbreviated.length) {
// copy the next part
int runAheadTarget = target;
while (source < abbreviated.length && abbreviated[source] != '.') {
abbreviated[runAheadTarget++] = abbreviated[source++];
}
++target;
if (useFull(runAheadTarget, source, abbreviated.length, lengthHint)
|| target > runAheadTarget) {
target = runAheadTarget;
}
// copy the '.' unless it was the last part
if (source < abbreviated.length) {
abbreviated[target++] = abbreviated[source++];
}
}
return new String(abbreviated, 0, target);
}
/**
* <p>Decides if the part that was just copied to its destination
* location in the work array can be kept as it was copied or must be
* abbreviated. It must be kept when the part is the last one, which
* is the simple name of the class. In this case the {@code source}
* index, from where the characters are copied points one position
* after the last character, a.k.a. {@code source ==
* originalLength}</p>
*
* <p>If the part is not the last one then it can be kept
* unabridged if the number of the characters copied so far plus
* the character that are to be copied is less than or equal to the
* desired length.</p>
*
* @param runAheadTarget the target index (where the characters were
* copied to) pointing after the last character
* copied when the current part was copied
* @param source the source index (where the characters were
* copied from) pointing after the last
* character copied when the current part was
* copied
* @param originalLength the original length of the class full name,
* which is abbreviated
* @param desiredLength the desired length of the abbreviated class
* name
* @return {@code true} if it can be kept in its original length
* {@code false} if the current part has to be abbreviated and
*/
private static boolean useFull(final int runAheadTarget,
final int source,
final int originalLength,
final int desiredLength) {
return source >= originalLength ||
runAheadTarget + originalLength - source <= desiredLength;
}
// Superclasses/Superinterfaces
// ----------------------------------------------------------------------
/**
* <p>Gets a {@code List} of superclasses for the given class.</p>
*
* @param cls the class to look up, may be {@code null}
* @return the {@code List} of superclasses in order going up from this one
* {@code null} if null input
*/
public static List<Class<?>> getAllSuperclasses(final Class<?> cls) {
if (cls == null) {
return null;
}
final List<Class<?>> classes = new ArrayList<>();
Class<?> superclass = cls.getSuperclass();
while (superclass != null) {
classes.add(superclass);
superclass = superclass.getSuperclass();
}
return classes;
}
/**
* <p>Gets a {@code List} 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}
* @return the {@code List} of interfaces in order,
* {@code null} if null input
*/
public static List<Class<?>> getAllInterfaces(final Class<?> cls) {
if (cls == null) {
return null;
}
final LinkedHashSet<Class<?>> interfacesFound = new LinkedHashSet<>();
getAllInterfaces(cls, interfacesFound);
return new ArrayList<>(interfacesFound);
}
/**
* Gets the interfaces for the specified class.
*
* @param cls the class to look up, may be {@code null}
* @param interfacesFound the {@code Set} of interfaces for the class
*/
private static void getAllInterfaces(Class<?> cls, final HashSet<Class<?>> interfacesFound) {
while (cls != null) {
final Class<?>[] interfaces = cls.getInterfaces();
for (final Class<?> i : interfaces) {
if (interfacesFound.add(i)) {
getAllInterfaces(i, interfacesFound);
}
}
cls = cls.getSuperclass();
}
}
// Convert list
// ----------------------------------------------------------------------
/**
* <p>Given a {@code List} of class names, this method converts them into classes.</p>
*
* <p>A new {@code List} is returned. If the class name cannot be found, {@code null}
* is stored in the {@code List}. If the class name in the {@code List} is
* {@code null}, {@code null} is stored in the output {@code List}.</p>
*
* @param classNames the classNames to change
* @return a {@code List} of Class objects corresponding to the class names,
* {@code null} if null input
* @throws ClassCastException if classNames contains a non String entry
*/
public static List<Class<?>> convertClassNamesToClasses(final List<String> classNames) {
if (classNames == null) {
return null;
}
final List<Class<?>> classes = new ArrayList<>(classNames.size());
for (final String className : classNames) {
try {
classes.add(Class.forName(className));
} catch (final Exception ex) {
classes.add(null);
}
}
return classes;
}
/**
* <p>Given a {@code List} of {@code Class} objects, this method converts
* them into class names.</p>
*
* <p>A new {@code List} is returned. {@code null} objects will be copied into
* the returned list as {@code null}.</p>
*
* @param classes the classes to change
* @return a {@code List} of class names corresponding to the Class objects,
* {@code null} if null input
* @throws ClassCastException if {@code classes} contains a non-{@code Class} entry
*/
public static List<String> convertClassesToClassNames(final List<Class<?>> classes) {
if (classes == null) {
return null;
}
final List<String> classNames = new ArrayList<>(classes.size());
for (final Class<?> cls : classes) {
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}s.</p>
*
* <p>Primitive widenings allow an int to be assigned to a {@code long},
* {@code float} or {@code double}. This method returns the correct
* result for these cases.</p>
*
* <p>{@code Null} may be assigned to any reference type. This method will
* return {@code true} if {@code null} is passed in and the toClass is
* non-primitive.</p>
*
* <p>Specifically, this method tests whether the type represented by the
* specified {@code Class} parameter can be converted to the type
* represented by this {@code Class} object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://docs.oracle.com/javase/specs/">The Java Language Specification</a></em>,
* sections 5.1.1, 5.1.2 and 5.1.4 for details.</p>
*
* <p><strong>Since Lang 3.0,</strong> this method will default behavior for
* calculating assignability between primitive and wrapper types <em>corresponding
* to the running Java version</em>; i.e. autoboxing will be the default
* behavior in VMs running Java versions > 1.5.</p>
*
* @param classArray the array of Classes to check, may be {@code null}
* @param toClassArray the array of Classes to try to assign into, may be {@code null}
* @return {@code true} if assignment possible
*/
public static boolean isAssignable(final Class<?>[] classArray, final Class<?>... toClassArray) {
return isAssignable(classArray, toClassArray, true);
}
/**
* <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}s.</p>
*
* <p>Primitive widenings allow an int to be assigned to a {@code long},
* {@code float} or {@code double}. This method returns the correct
* result for these cases.</p>
*
* <p>{@code Null} may be assigned to any reference type. This method will
* return {@code true} if {@code null} is passed in and the toClass is
* non-primitive.</p>
*
* <p>Specifically, this method tests whether the type represented by the
* specified {@code Class} parameter can be converted to the type
* represented by this {@code Class} object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://docs.oracle.com/javase/specs/">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}
* @param toClassArray the array of Classes to try to assign into, may be {@code null}
* @param autoboxing whether to use implicit autoboxing/unboxing between primitives and wrappers
* @return {@code true} if assignment possible
*/
public static boolean isAssignable(Class<?>[] classArray, Class<?>[] toClassArray, final boolean autoboxing) {
if (!ArrayUtils.isSameLength(classArray, toClassArray)) {
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)) {
return false;
}
}
return true;
}
/**
* Returns whether the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
* {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
*
* @param type
* The class to query or null.
* @return true if the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
* {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
* @since 3.1
*/
public static boolean isPrimitiveOrWrapper(final Class<?> type) {
if (type == null) {
return false;
}
return type.isPrimitive() || isPrimitiveWrapper(type);
}
/**
* Returns whether the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character}, {@link Short},
* {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
*
* @param type
* The class to query or null.
* @return true if the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character}, {@link Short},
* {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
* @since 3.1
*/
public static boolean isPrimitiveWrapper(final Class<?> type) {
return wrapperPrimitiveMap.containsKey(type);
}
/**
* <p>Checks if one {@code Class} can be assigned to a variable of
* another {@code Class}.</p>
*
* <p>Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method,
* this method takes into account widenings of primitive classes and
* {@code null}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} may be assigned to any reference type. This method
* will return {@code true} if {@code null} is passed in and the
* toClass is non-primitive.</p>
*
* <p>Specifically, this method tests whether the type represented by the
* specified {@code Class} parameter can be converted to the type
* represented by this {@code Class} object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://docs.oracle.com/javase/specs/">The Java Language Specification</a></em>,
* sections 5.1.1, 5.1.2 and 5.1.4 for details.</p>
*
* <p><strong>Since Lang 3.0,</strong> this method will default behavior for
* calculating assignability between primitive and wrapper types <em>corresponding
* to the running Java version</em>; i.e. autoboxing will be the default
* behavior in VMs running Java versions > 1.5.</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} if assignment possible
*/
public static boolean isAssignable(final Class<?> cls, final Class<?> toClass) {
return isAssignable(cls, toClass, true);
}
/**
* <p>Checks if one {@code Class} can be assigned to a variable of
* another {@code Class}.</p>
*
* <p>Unlike the {@link Class#isAssignableFrom(java.lang.Class)} method,
* this method takes into account widenings of primitive classes and
* {@code null}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} may be assigned to any reference type. This method
* will return {@code true} if {@code null} is passed in and the
* toClass is non-primitive.</p>
*
* <p>Specifically, this method tests whether the type represented by the
* specified {@code Class} parameter can be converted to the type
* represented by this {@code Class} object via an identity conversion
* widening primitive or widening reference conversion. See
* <em><a href="http://docs.oracle.com/javase/specs/">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} if assignment possible
*/
public static boolean isAssignable(Class<?> cls, final Class<?> toClass, final 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()) {
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},
* returning {@code Void.TYPE}.</p>
*
* @param cls the class to convert, may be null
* @return the wrapper class for {@code cls} or {@code cls} if
* {@code cls} is not a primitive. {@code null} if null input.
* @since 2.1
*/
public static Class<?> primitiveToWrapper(final Class<?> cls) {
Class<?> convertedClass = cls;
if (cls != null && cls.isPrimitive()) {
convertedClass = 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} if null input.
* Empty array if an empty array passed in.
* @since 2.1
*/
public static Class<?>[] primitivesToWrappers(final Class<?>... classes) {
if (classes == null) {
return null;
}
if (classes.length == 0) {
return classes;
}
final 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()}.
* If the passed in class is a wrapper class for a primitive type, this
* primitive type will be returned (e.g. {@code Integer.TYPE} for
* {@code Integer.class}). 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} is a
* wrapper class, <b>null</b> otherwise
* @see #primitiveToWrapper(Class)
* @since 2.4
*/
public static Class<?> wrapperToPrimitive(final Class<?> cls) {