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net.serenitybdd.junit5.utils.ClassUtil Maven / Gradle / Ivy
package net.serenitybdd.junit5.utils;
import java.io.Closeable;
import java.io.Externalizable;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.*;
public class ClassUtil {
private static final Map, Class> primitiveWrapperTypeMap = new IdentityHashMap(9);
private static final Map> primitiveTypeNameMap = new HashMap(32);
private static final Map, Class> primitiveTypeToWrapperMap = new IdentityHashMap<>(9);
private static final Map> commonClassCache = new HashMap(64);
/** Suffix for array class names: {@code "[]"}. */
public static final String ARRAY_SUFFIX = "[]";
/** Prefix for internal array class names: {@code "["}. */
private static final String INTERNAL_ARRAY_PREFIX = "[";
/** Prefix for internal non-primitive array class names: {@code "[L"}. */
private static final String NON_PRIMITIVE_ARRAY_PREFIX = "[L";
/** The package separator character: {@code '.'}. */
private static final char PACKAGE_SEPARATOR = '.';
/** The path separator character: {@code '/'}. */
private static final char PATH_SEPARATOR = '/';
/** The nested class separator character: {@code '$'}. */
private static final char NESTED_CLASS_SEPARATOR = '$';
/** The CGLIB class separator: {@code "$$"}. */
public static final String CGLIB_CLASS_SEPARATOR = "$$";
/** The ".class" file suffix. */
public static final String CLASS_FILE_SUFFIX = ".class";
public static Class forName(String name, ClassLoader classLoader) throws ClassNotFoundException, LinkageError {
Class clazz = resolvePrimitiveClassName(name);
if (clazz == null) {
clazz = commonClassCache.get(name);
}
if (clazz != null) {
return clazz;
}
// "java.lang.String[]" style arrays
if (name.endsWith(ARRAY_SUFFIX)) {
String elementClassName = name.substring(0, name.length() - ARRAY_SUFFIX.length());
Class elementClass = forName(elementClassName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
// "[Ljava.lang.String;" style arrays
if (name.startsWith(NON_PRIMITIVE_ARRAY_PREFIX) && name.endsWith(";")) {
String elementName = name.substring(NON_PRIMITIVE_ARRAY_PREFIX.length(), name.length() - 1);
Class elementClass = forName(elementName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
// "[[I" or "[[Ljava.lang.String;" style arrays
if (name.startsWith(INTERNAL_ARRAY_PREFIX)) {
String elementName = name.substring(INTERNAL_ARRAY_PREFIX.length());
Class elementClass = forName(elementName, classLoader);
return Array.newInstance(elementClass, 0).getClass();
}
ClassLoader clToUse = classLoader;
if (clToUse == null) {
clToUse = getDefaultClassLoader();
}
try {
return Class.forName(name, false, clToUse);
}
catch (ClassNotFoundException ex) {
int lastDotIndex = name.lastIndexOf(PACKAGE_SEPARATOR);
if (lastDotIndex != -1) {
String nestedClassName =
name.substring(0, lastDotIndex) + NESTED_CLASS_SEPARATOR + name.substring(lastDotIndex + 1);
try {
return Class.forName(nestedClassName, false, clToUse);
}
catch (ClassNotFoundException ex2) {
// Swallow - let original exception get through
}
}
throw ex;
}
}
public static Class resolvePrimitiveClassName( String name) {
Class result = null;
if (name != null && name.length() <= 7) {
result = (Class)primitiveTypeNameMap.get(name);
}
return result;
}
public static ClassLoader getDefaultClassLoader() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
}
catch (Throwable ex) {
// Cannot access thread context ClassLoader - falling back...
}
if (cl == null) {
// No thread context class loader -> use class loader of this class.
cl = ClassUtil.class.getClassLoader();
if (cl == null) {
// getClassLoader() returning null indicates the bootstrap ClassLoader
try {
cl = ClassLoader.getSystemClassLoader();
}
catch (Throwable ex) {
// Cannot access system ClassLoader - oh well, maybe the caller can live with null...
}
}
}
return cl;
}
private static void registerCommonClasses(Class... commonClasses) {
for (Class clazz : commonClasses) {
commonClassCache.put(clazz.getName(), clazz);
}
}
static {
primitiveWrapperTypeMap.put(Boolean.class, boolean.class);
primitiveWrapperTypeMap.put(Byte.class, byte.class);
primitiveWrapperTypeMap.put(Character.class, char.class);
primitiveWrapperTypeMap.put(Double.class, double.class);
primitiveWrapperTypeMap.put(Float.class, float.class);
primitiveWrapperTypeMap.put(Integer.class, int.class);
primitiveWrapperTypeMap.put(Long.class, long.class);
primitiveWrapperTypeMap.put(Short.class, short.class);
primitiveWrapperTypeMap.put(Void.class, void.class);
// Map entry iteration is less expensive to initialize than forEach with lambdas
for (Map.Entry, Class> entry : primitiveWrapperTypeMap.entrySet()) {
primitiveTypeToWrapperMap.put(entry.getValue(), entry.getKey());
registerCommonClasses(entry.getKey());
}
Set> primitiveTypes = new HashSet<>(32);
primitiveTypes.addAll(primitiveWrapperTypeMap.values());
Collections.addAll(primitiveTypes, boolean[].class, byte[].class, char[].class,
double[].class, float[].class, int[].class, long[].class, short[].class);
for (Class primitiveType : primitiveTypes) {
primitiveTypeNameMap.put(primitiveType.getName(), primitiveType);
}
registerCommonClasses(Boolean[].class, Byte[].class, Character[].class, Double[].class,
Float[].class, Integer[].class, Long[].class, Short[].class);
registerCommonClasses(Number.class, Number[].class, String.class, String[].class,
Class.class, Class[].class, Object.class, Object[].class);
registerCommonClasses(Throwable.class, Exception.class, RuntimeException.class,
Error.class, StackTraceElement.class, StackTraceElement[].class);
registerCommonClasses(Enum.class, Iterable.class, Iterator.class, Enumeration.class,
Collection.class, List.class, Set.class, Map.class, Map.Entry.class, Optional.class);
Class[] javaLanguageInterfaceArray = {Serializable.class, Externalizable.class,
Closeable.class, AutoCloseable.class, Cloneable.class, Comparable.class};
registerCommonClasses(javaLanguageInterfaceArray);
}
}
