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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.
/** 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)); } }