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Copy pathObjects.java
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99 lines (90 loc) · 4.06 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 static com.sun.max.unsafe.WithoutAccessCheck.*;
import java.lang.reflect.*;
import com.sun.max.*;
import com.sun.max.program.*;
/**
* Basic generic utilities for objects.
*
* @author Bernd Mathiske
* @author Doug Simon
*/
public final class Objects {
private Objects() {
}
/**
* Compares two given objects for equality using {@link Object#equals(Object)}.
*
* @return true if both {@code o1} and {@code o2} are {@code null} || {@code o1.equals(o2)}
*/
public static boolean equal(Object o1, Object o2) {
return o1 == null ? o2 == null : o1.equals(o2);
}
/**
* Copies the values of the instance fields in one object to another object.
*
* @param fromObject the object from which the field values are to be copied
* @param toObject the object to which the field values are to be copied
*/
public static void copy(Object fromObject, Object toObject) {
assert fromObject.getClass() == toObject.getClass();
Class c = fromObject.getClass();
while (c != null) {
for (Field field : c.getDeclaredFields()) {
if ((field.getModifiers() & Modifier.STATIC) == 0) {
field.setAccessible(true);
try {
final Object value = field.get(fromObject);
field.set(toObject, value);
} catch (IllegalArgumentException illegalArgumentException) {
// This should never occur
throw ProgramError.unexpected(illegalArgumentException);
} catch (IllegalAccessException illegalAccessException) {
// This should never occur
throw ProgramError.unexpected(illegalAccessException);
}
}
}
c = c.getSuperclass();
}
}
/**
* Creates a new instance of a given class without calling any constructors. This call also ensures that {@code javaClass}
* has been initialized.
*
* @param javaClass the class to construct an instance of
* @return an uninitialized of {@code javaClass}
* @throws InstantiationException if the instantiation fails for any of the reasons described
* {@linkplain InstantiationException here}
*/
public static Object allocateInstance(Class<?> javaClass) throws InstantiationException {
unsafe.ensureClassInitialized(javaClass);
return unsafe.allocateInstance(javaClass);
}
public static <T> T allocateObject(Class<T> javaClass) throws InstantiationException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
final Constructor constructor = javaClass.getDeclaredConstructor();
constructor.setAccessible(true);
final Object object = constructor.newInstance();
return Utils.cast(javaClass, object);
}
}