Back to index...

	/*
	* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package jdk.internal.reflect;

	import java.lang.reflect.Field;
	import java.lang.reflect.Modifier;
	import jdk.internal.misc.Unsafe;

	/** Base class for jdk.internal.misc.Unsafe-based FieldAccessors. The
	observation is that there are only nine types of fields from the
	standpoint of reflection code: the eight primitive types and
	Object. Using class Unsafe instead of generated bytecodes saves
	memory and loading time for the dynamically-generated
	FieldAccessors. */

	abstract class UnsafeFieldAccessorImpl extends FieldAccessorImpl {
	static final Unsafe unsafe = Unsafe.getUnsafe();

	protected final Field field;
	protected final long fieldOffset;
	protected final boolean isFinal;

	UnsafeFieldAccessorImpl(Field field) {
	this.field = field;
	if (Modifier.isStatic(field.getModifiers()))
	fieldOffset = unsafe.staticFieldOffset(field);
	else
	fieldOffset = unsafe.objectFieldOffset(field);
	isFinal = Modifier.isFinal(field.getModifiers());
	}

	protected void ensureObj(Object o) {
	// NOTE: will throw NullPointerException, as specified, if o is null
	if (!field.getDeclaringClass().isAssignableFrom(o.getClass())) {
	throwSetIllegalArgumentException(o);
	}
	}

	private String getQualifiedFieldName() {
	return field.getDeclaringClass().getName() + "." +field.getName();
	}

	protected IllegalArgumentException newGetIllegalArgumentException(String type) {
	return new IllegalArgumentException(
	"Attempt to get "+field.getType().getName()+" field \"" +
	getQualifiedFieldName() + "\" with illegal data type conversion to "+type
	);
	}

	protected void throwFinalFieldIllegalAccessException(String attemptedType,
	String attemptedValue)
	throws IllegalAccessException {
	throw new IllegalAccessException(getSetMessage(attemptedType, attemptedValue));

	}
	protected void throwFinalFieldIllegalAccessException(Object o) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException(o != null ? o.getClass().getName() : "", "");
	}

	protected void throwFinalFieldIllegalAccessException(boolean z) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("boolean", Boolean.toString(z));
	}

	protected void throwFinalFieldIllegalAccessException(char b) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("char", Character.toString(b));
	}

	protected void throwFinalFieldIllegalAccessException(byte b) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("byte", Byte.toString(b));
	}

	protected void throwFinalFieldIllegalAccessException(short b) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("short", Short.toString(b));
	}

	protected void throwFinalFieldIllegalAccessException(int i) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("int", Integer.toString(i));
	}

	protected void throwFinalFieldIllegalAccessException(long i) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("long", Long.toString(i));
	}

	protected void throwFinalFieldIllegalAccessException(float f) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("float", Float.toString(f));
	}

	protected void throwFinalFieldIllegalAccessException(double f) throws IllegalAccessException {
	throwFinalFieldIllegalAccessException("double", Double.toString(f));
	}

	protected IllegalArgumentException newGetBooleanIllegalArgumentException() {
	return newGetIllegalArgumentException("boolean");
	}

	protected IllegalArgumentException newGetByteIllegalArgumentException() {
	return newGetIllegalArgumentException("byte");
	}

	protected IllegalArgumentException newGetCharIllegalArgumentException() {
	return newGetIllegalArgumentException("char");
	}

	protected IllegalArgumentException newGetShortIllegalArgumentException() {
	return newGetIllegalArgumentException("short");
	}

	protected IllegalArgumentException newGetIntIllegalArgumentException() {
	return newGetIllegalArgumentException("int");
	}

	protected IllegalArgumentException newGetLongIllegalArgumentException() {
	return newGetIllegalArgumentException("long");
	}

	protected IllegalArgumentException newGetFloatIllegalArgumentException() {
	return newGetIllegalArgumentException("float");
	}

	protected IllegalArgumentException newGetDoubleIllegalArgumentException() {
	return newGetIllegalArgumentException("double");
	}

	protected String getSetMessage(String attemptedType, String attemptedValue) {
	String err = "Can not set";
	if (Modifier.isStatic(field.getModifiers()))
	err += " static";
	if (isFinal)
	err += " final";
	err += " " + field.getType().getName() + " field " + getQualifiedFieldName() + " to ";
	if (!attemptedValue.isEmpty()) {
	err += "(" + attemptedType + ")" + attemptedValue;
	} else {
	if (!attemptedType.isEmpty())
	err += attemptedType;
	else
	err += "null value";
	}
	return err;
	}

	protected void throwSetIllegalArgumentException(String attemptedType,
	String attemptedValue) {
	throw new IllegalArgumentException(getSetMessage(attemptedType,attemptedValue));
	}

	protected void throwSetIllegalArgumentException(Object o) {
	throwSetIllegalArgumentException(o != null ? o.getClass().getName() : "", "");
	}

	protected void throwSetIllegalArgumentException(boolean b) {
	throwSetIllegalArgumentException("boolean", Boolean.toString(b));
	}

	protected void throwSetIllegalArgumentException(byte b) {
	throwSetIllegalArgumentException("byte", Byte.toString(b));
	}

	protected void throwSetIllegalArgumentException(char c) {
	throwSetIllegalArgumentException("char", Character.toString(c));
	}

	protected void throwSetIllegalArgumentException(short s) {
	throwSetIllegalArgumentException("short", Short.toString(s));
	}

	protected void throwSetIllegalArgumentException(int i) {
	throwSetIllegalArgumentException("int", Integer.toString(i));
	}

	protected void throwSetIllegalArgumentException(long l) {
	throwSetIllegalArgumentException("long", Long.toString(l));
	}

	protected void throwSetIllegalArgumentException(float f) {
	throwSetIllegalArgumentException("float", Float.toString(f));
	}

	protected void throwSetIllegalArgumentException(double d) {
	throwSetIllegalArgumentException("double", Double.toString(d));
	}

	}

Back to index...