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431 lines (402 loc) · 17.9 KB
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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.lang;
import java.lang.reflect.*;
import com.sun.max.*;
/**
* Methods that might be members of java.lang.Class.
*
* @author Bernd Mathiske
* @author Doug Simon
*/
public final class Classes {
private Classes() {
}
/**
* Wraps a call to {@link ClassLoader#loadClass(String)} that is expected not to fail. Should a
* {@link ClassNotFoundException} occur, it is converted to {@link NoClassDefFoundError}
*
* @return the value returned by calling {@link ClassLoader#loadClass(String)} on {@code classLoader}
*/
public static Class load(ClassLoader classLoader, String name) {
try {
return classLoader.loadClass(name);
} catch (ClassNotFoundException e) {
throw (NoClassDefFoundError) new NoClassDefFoundError(name).initCause(e);
}
}
/**
* Wraps a call to {@link Class#forName(String)} that is expected not to fail. Should a
* {@link ClassNotFoundException} occur, it is converted to {@link NoClassDefFoundError}
*/
public static Class forName(String name) {
try {
return Class.forName(name);
} catch (ClassNotFoundException e) {
throw (NoClassDefFoundError) new NoClassDefFoundError(name).initCause(e);
}
}
/**
* Wraps a call to {@link Class#forName(String, boolean, ClassLoader)} that is expected not to fail. Should a
* {@link ClassNotFoundException} occur, it is converted to {@link NoClassDefFoundError}
*/
public static Class forName(String name, boolean initialize, ClassLoader loader) {
try {
return Class.forName(name, initialize, loader);
} catch (ClassNotFoundException e) {
throw (NoClassDefFoundError) new NoClassDefFoundError(name).initCause(e);
}
}
/**
* Links a given class. If the class {@code c} has already been linked, then this method simply returns. Otherwise,
* the class is linked as described in the "Execution" chapter of the <a
* href="http://java.sun.com/docs/books/jls/">Java Language Specification</a>.
*
* @param c the class to link
*/
public static void link(Class c) {
if (c != null) {
try {
final Class<?> linkedClass = Class.forName(c.getName(), false, c.getClassLoader());
assert linkedClass == c;
} catch (ClassNotFoundException classNotFoundException) {
throw (NoClassDefFoundError) new NoClassDefFoundError(c.getName()).initCause(classNotFoundException);
}
}
}
/**
* Initializes a given class. If the class {@code c} has already been initialized, then this method simply returns. Otherwise,
* the class is linked as described in the "Execution" chapter of the <a
* href="http://java.sun.com/docs/books/jls/">Java Language Specification</a>.
*
* @param c the class to link
*/
public static void initialize(Class c) {
try {
Class.forName(c.getName(), true, c.getClassLoader());
} catch (ClassNotFoundException classNotFoundException) {
throw (NoClassDefFoundError) new NoClassDefFoundError(c.getName()).initCause(classNotFoundException);
}
}
public static boolean areRelated(Class<?> class1, Class<?> class2) {
return class1.isAssignableFrom(class2) || class2.isAssignableFrom(class1);
}
public static boolean areAssignableFrom(Class<?>[] superTypes, Class<?>... subTypes) {
if (superTypes.length != subTypes.length) {
return false;
}
for (int i = 0; i < superTypes.length; i++) {
if (!superTypes[i].isAssignableFrom(subTypes[i])) {
return false;
}
}
return true;
}
/**
* Extends the functionality of {@link Class#getConstructor(Class...)} to find a constructor whose formal parameter
* types are assignable from the types of a list of arguments.
*
* @param javaClass the class to search in
* @param arguments the list of arguments that will be passed to the constructor
* @return the first constructor in {@link Class#getConstructors() javaClass.getConstructors()} that will accept
* {@code arguments} or null if no such constructor exists
*/
public static Constructor<?> findConstructor(Class<?> javaClass, Object... arguments) {
nextConstructor:
for (Constructor<?> constructor : javaClass.getConstructors()) {
final Class<?>[] parameterTypes = constructor.getParameterTypes();
if (parameterTypes.length == arguments.length) {
for (int i = 0; i != arguments.length; ++i) {
if (!parameterTypes[i].isAssignableFrom(arguments[i].getClass())) {
continue nextConstructor;
}
}
return constructor;
}
}
return null;
}
/**
* Extends the functionality of {@link Class#getMethod(String, Class...)} to find a method whose formal parameter
* types are assignable from the types of a list of arguments.
*
* @param javaClass the class to search in
* @param name the name of the method to search for
* @param arguments the list of arguments that will be passed to the constructor
* @return the first method in {@link Class#getMethods() javaClass.getMethods()} that will accept {@code arguments}
* or null if no such method exists
*/
public static Method findMethod(Class<?> javaClass, String name, Object... arguments) {
nextMethod:
for (Method method : javaClass.getMethods()) {
final Class<?>[] parameterTypes = method.getParameterTypes();
if (method.getName().equals(name) && parameterTypes.length == arguments.length) {
for (int i = 0; i != arguments.length; ++i) {
if (!parameterTypes[i].isAssignableFrom(arguments[i].getClass())) {
continue nextMethod;
}
}
return method;
}
}
return null;
}
/**
* Extends the functionality of {@link Class#getDeclaredMethod(String, Class...)} to find a method whose formal
* parameter types are assignable from the types of a list of arguments.
*
* @param javaClass the class to search in
* @param name the name of the method to search for
* @param arguments the list of arguments that will be passed to the constructor
* @return the first method in {@link Class#getDeclaredMethods() javaClass.getDeclaredMethods()} that will accept
* {@code arguments} or null if no such method exists
*/
public static Method findDeclaredMethod(Class<?> javaClass, String name, Object... arguments) {
nextMethod:
for (Method declaredMethod : javaClass.getDeclaredMethods()) {
final Class<?>[] parameterTypes = declaredMethod.getParameterTypes();
if (declaredMethod.getName().equals(name) && parameterTypes.length == arguments.length) {
for (int i = 0; i != arguments.length; ++i) {
if (!parameterTypes[i].isAssignableFrom(arguments[i].getClass())) {
continue nextMethod;
}
}
return declaredMethod;
}
}
return null;
}
/**
* Performs method resolution as detailed in section 5.4.3.3 of the JVM specification except for the accessibility
* checks detailed in section 5.4.4.
*
* @param javaClass the class to start the resolution from
* @param returnType the return type of the method to resolve
* @param name the name of the method to resolve
* @param parameterTypes the parameter types of the method to resolve
* @return the resolved method
* @throws NoSuchMethodError if the method resolution fails
* @throws AbstractMethodError if the resolved method is abstract
*/
public static Method resolveMethod(Class<?> javaClass, Class returnType, String name, Class... parameterTypes) {
if (!name.equals("<init>") && !name.equals("<clinit>")) {
Class<?> declaringClass = javaClass;
if (javaClass.isInterface()) {
try {
return javaClass.getMethod(name, parameterTypes);
} catch (NoSuchMethodException e) {
throw new NoSuchMethodError(e.getMessage());
}
}
do {
try {
final Method method = getDeclaredMethod(declaringClass, returnType, name, parameterTypes);
if (Modifier.isAbstract(method.getModifiers()) && !Modifier.isAbstract(declaringClass.getModifiers())) {
throw new AbstractMethodError();
}
return method;
} catch (NoSuchMethodError e) {
declaringClass = declaringClass.getSuperclass();
}
} while (declaringClass != null);
}
throw new NoSuchMethodError(returnType.getName() + " " + javaClass.getName() + "." + name + "(" + Utils.toString(parameterTypes, ", ") + ")");
}
/**
* Performs field resolution as detailed in section 5.4.3.2 of the JVM specification except for the accessibility
* checks detailed in section 5.4.4.
* @param javaClass the class to start the resolution from
* @param type the type of the field to resolve
* @param name the name of the field to resolve
*
* @return the resolved field
* @throws NoSuchFieldError if the field resolution fails
*/
public static Field resolveField(Class<?> javaClass, Class type, String name) {
Class<?> declaringClass = javaClass;
do {
try {
return getDeclaredField(declaringClass, name, type);
} catch (NoSuchFieldError e) {
for (Class superInterface : javaClass.getInterfaces()) {
try {
return resolveField(superInterface, type, name);
} catch (NoSuchFieldError noSuchFieldError) {
// Ignore
}
}
declaringClass = declaringClass.getSuperclass();
}
} while (declaringClass != null);
throw new NoSuchFieldError(type.getName() + " " + javaClass.getName() + "." + name);
}
/**
* Gets the class or interface that declares the method, field or constructor represented by {@code member}.
*/
public static Class<?> getDeclaringClass(AccessibleObject member) {
if (member instanceof Method) {
final Method method = (Method) member;
return method.getDeclaringClass();
}
if (member instanceof Field) {
final Field field = (Field) member;
return field.getDeclaringClass();
}
assert member instanceof Constructor;
final Constructor constructor = (Constructor) member;
return constructor.getDeclaringClass();
}
/**
* Get hold of a non-public inner class.
*/
public static Class getInnerClass(Class outerClass, String innerClassSimpleName) {
for (Class innerClass : outerClass.getDeclaredClasses()) {
if (innerClass.getSimpleName().equals(innerClassSimpleName)) {
return innerClass;
}
}
return null;
}
/**
* Extracts a package name from a fully qualified class name.
*
* @return "" if {@code className} denotes a class in the unnamed package
*/
public static String getPackageName(String className) {
final int index = className.lastIndexOf('.');
if (index < 0) {
return "";
}
return className.substring(0, index);
}
/**
* Extracts a simple class name from a fully qualified class name.
*/
public static String getSimpleName(String className) {
final int index = className.lastIndexOf('.');
if (index < 0) {
return className;
}
return className.substring(index + 1);
}
/**
* Extends the functionality of {@link Class#getSimpleName()} to include a non-empty string for anonymous and local
* classes.
*
* @param clazz the class for which the simple name is being requested
* @param withEnclosingClass specifies if the returned name should be qualified with the name(s) of the enclosing
* class/classes of {@code clazz} (if any). This option is ignored if {@code clazz} denotes an anonymous
* or local class.
* @return
*/
public static String getSimpleName(Class<?> clazz, boolean withEnclosingClass) {
final String simpleName = clazz.getSimpleName();
if (simpleName.length() != 0) {
if (withEnclosingClass) {
String prefix = "";
Class enclosingClass = clazz;
while ((enclosingClass = enclosingClass.getEnclosingClass()) != null) {
prefix = prefix + enclosingClass.getSimpleName() + ".";
}
return prefix + simpleName;
}
return simpleName;
}
// Must be an anonymous or local class
final String name = clazz.getName();
int index = name.indexOf('$');
if (index == -1) {
return name;
}
index = name.lastIndexOf('.', index);
if (index == -1) {
return name;
}
return name.substring(index + 1);
}
/**
* Similar to {@link Class#getDeclaredMethod(String, Class...)} except that
* the search takes into account the return type.
*/
public static Method getDeclaredMethod(Class<?> clazz, Class returnType, String name, Class... parameterTypes) throws NoSuchMethodError {
for (Method javaMethod : clazz.getDeclaredMethods()) {
if (javaMethod.getName().equals(name) && javaMethod.getReturnType().equals(returnType)) {
final Class[] declaredParameterTypes = javaMethod.getParameterTypes();
if (java.util.Arrays.equals(declaredParameterTypes, parameterTypes)) {
return javaMethod;
}
}
}
throw new NoSuchMethodError(returnType.getName() + " " + clazz.getName() + "." + name + "(" + Utils.toString(parameterTypes, ",") + ")");
}
/**
* A wrapper for a call to {@link Class#getDeclaredMethod(String, Class...)} that must succeed.
*/
public static Method getDeclaredMethod(Class<?> clazz, String name, Class... parameterTypes) {
try {
return clazz.getDeclaredMethod(name, parameterTypes);
} catch (NoSuchMethodException noSuchMethodException) {
throw (NoSuchMethodError) new NoSuchMethodError(clazz.getName() + "." + name + "(" + Utils.toString(parameterTypes, ",") + ")").initCause(noSuchMethodException);
}
}
/**
* A wrapper for a call to {@link Class#getDeclaredConstructor(Class...)} that must succeed.
*/
public static Constructor getDeclaredConstructor(Class<?> clazz, Class... parameterTypes) {
try {
return clazz.getDeclaredConstructor(parameterTypes);
} catch (NoSuchMethodException noSuchMethodException) {
throw (NoSuchMethodError) new NoSuchMethodError(clazz.getName() + "(" + Utils.toString(parameterTypes, ",") + ")").initCause(noSuchMethodException);
}
}
/**
* A wrapper for a call to {@link Class#getDeclaredField(String)} that must succeed.
*/
public static Field getDeclaredField(Class<?> clazz, String name) {
try {
return clazz.getDeclaredField(name);
} catch (NoSuchFieldException noSuchFieldException) {
throw (NoSuchFieldError) new NoSuchFieldError(clazz.getName() + "." + name).initCause(noSuchFieldException);
}
}
/**
* Similar to {@link Class#getDeclaredField(String)} except that the lookup takes into account a given field type.
*/
public static Field getDeclaredField(Class<?> clazz, String name, Class type) throws NoSuchFieldError {
for (Field field : clazz.getDeclaredFields()) {
if (field.getName().equals(name) && field.getType().equals(type)) {
return field;
}
}
throw new NoSuchFieldError(type.getName() + " " + clazz.getName() + "." + name);
}
public static void main(Class<?> classToRun, String[] args) {
try {
final Method mainMethod = classToRun.getMethod("main", String[].class);
mainMethod.invoke(null, (Object) args);
} catch (Exception e) {
throw (Error) new Error().initCause(e);
}
}
public static void main(String classToRun, String[] args) {
main(forName(classToRun), args);
}
}