/*

 * 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

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 * 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 ";

            err += "(" + attemptedType + ")" + attemptedValue;

        } else {

                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));

    }

}