Back to index...

	/*
	* Copyright (c) 2008, 2012, 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 sun.invoke.util;

	public enum Wrapper {
	// wrapperType primitiveType char zero emptyArray format
	BOOLEAN( Boolean.class, boolean.class, 'Z', (Boolean)false, new boolean[0], Format.unsigned( 1)),
	// These must be in the order defined for widening primitive conversions in JLS 5.1.2
	BYTE ( Byte.class, byte.class, 'B', (Byte)(byte)0, new byte[0], Format.signed( 8)),
	SHORT ( Short.class, short.class, 'S', (Short)(short)0, new short[0], Format.signed( 16)),
	CHAR (Character.class, char.class, 'C', (Character)(char)0, new char[0], Format.unsigned(16)),
	INT ( Integer.class, int.class, 'I', (Integer)/(int)/0, new int[0], Format.signed( 32)),
	LONG ( Long.class, long.class, 'J', (Long)(long)0, new long[0], Format.signed( 64)),
	FLOAT ( Float.class, float.class, 'F', (Float)(float)0, new float[0], Format.floating(32)),
	DOUBLE ( Double.class, double.class, 'D', (Double)(double)0, new double[0], Format.floating(64)),
	OBJECT ( Object.class, Object.class, 'L', null, new Object[0], Format.other( 1)),
	// VOID must be the last type, since it is "assignable" from any other type:
	VOID ( Void.class, void.class, 'V', null, null, Format.other( 0)),
	;

	private final Class<?> wrapperType;
	private final Class<?> primitiveType;
	private final char basicTypeChar;
	private final Object zero;
	private final Object emptyArray;
	private final int format;
	private final String wrapperSimpleName;
	private final String primitiveSimpleName;

	private Wrapper(Class<?> wtype, Class<?> ptype, char tchar, Object zero, Object emptyArray, int format) {
	this.wrapperType = wtype;
	this.primitiveType = ptype;
	this.basicTypeChar = tchar;
	this.zero = zero;
	this.emptyArray = emptyArray;
	this.format = format;
	this.wrapperSimpleName = wtype.getSimpleName();
	this.primitiveSimpleName = ptype.getSimpleName();
	}

	/** For debugging, give the details of this wrapper. */
	public String detailString() {
	return wrapperSimpleName+
	java.util.Arrays.asList(wrapperType, primitiveType,
	basicTypeChar, zero,
	"0x"+Integer.toHexString(format));
	}

	private static abstract class Format {
	static final int SLOT_SHIFT = 0, SIZE_SHIFT = 2, KIND_SHIFT = 12;
	static final int
	SIGNED = (-1) << KIND_SHIFT,
	UNSIGNED = 0 << KIND_SHIFT,
	FLOATING = 1 << KIND_SHIFT;
	static final int
	SLOT_MASK = ((1<<(SIZE_SHIFT-SLOT_SHIFT))-1),
	SIZE_MASK = ((1<<(KIND_SHIFT-SIZE_SHIFT))-1);
	static int format(int kind, int size, int slots) {
	assert(((kind >> KIND_SHIFT) << KIND_SHIFT) == kind);
	assert((size & (size-1)) == 0); // power of two
	assert((kind == SIGNED) ? (size > 0) :
	(kind == UNSIGNED) ? (size > 0) :
	(kind == FLOATING) ? (size == 32 \|\| size == 64) :
	false);
	assert((slots == 2) ? (size == 64) :
	(slots == 1) ? (size <= 32) :
	false);
	return kind \| (size << SIZE_SHIFT) \| (slots << SLOT_SHIFT);
	}
	static final int
	INT = SIGNED \| (32 << SIZE_SHIFT) \| (1 << SLOT_SHIFT),
	SHORT = SIGNED \| (16 << SIZE_SHIFT) \| (1 << SLOT_SHIFT),
	BOOLEAN = UNSIGNED \| (1 << SIZE_SHIFT) \| (1 << SLOT_SHIFT),
	CHAR = UNSIGNED \| (16 << SIZE_SHIFT) \| (1 << SLOT_SHIFT),
	FLOAT = FLOATING \| (32 << SIZE_SHIFT) \| (1 << SLOT_SHIFT),
	VOID = UNSIGNED \| (0 << SIZE_SHIFT) \| (0 << SLOT_SHIFT),
	NUM_MASK = (-1) << SIZE_SHIFT;
	static int signed(int size) { return format(SIGNED, size, (size > 32 ? 2 : 1)); }
	static int unsigned(int size) { return format(UNSIGNED, size, (size > 32 ? 2 : 1)); }
	static int floating(int size) { return format(FLOATING, size, (size > 32 ? 2 : 1)); }
	static int other(int slots) { return slots << SLOT_SHIFT; }
	}

	/// format queries:

	/** How many bits are in the wrapped value? Returns 0 for OBJECT or VOID. */
	public int bitWidth() { return (format >> Format.SIZE_SHIFT) & Format.SIZE_MASK; }
	/** How many JVM stack slots occupied by the wrapped value? Returns 0 for VOID. */
	public int stackSlots() { return (format >> Format.SLOT_SHIFT) & Format.SLOT_MASK; }
	/** Does the wrapped value occupy a single JVM stack slot? */
	public boolean isSingleWord() { return (format & (1 << Format.SLOT_SHIFT)) != 0; }
	/** Does the wrapped value occupy two JVM stack slots? */
	public boolean isDoubleWord() { return (format & (2 << Format.SLOT_SHIFT)) != 0; }
	/** Is the wrapped type numeric (not void or object)? */
	public boolean isNumeric() { return (format & Format.NUM_MASK) != 0; }
	/** Is the wrapped type a primitive other than float, double, or void? */
	public boolean isIntegral() { return isNumeric() && format < Format.FLOAT; }
	/** Is the wrapped type one of int, boolean, byte, char, or short? */
	public boolean isSubwordOrInt() { return isIntegral() && isSingleWord(); }
	/* Is the wrapped value a signed integral type (one of byte, short, int, or long)? */
	public boolean isSigned() { return format < Format.VOID; }
	/* Is the wrapped value an unsigned integral type (one of boolean or char)? */
	public boolean isUnsigned() { return format >= Format.BOOLEAN && format < Format.FLOAT; }
	/** Is the wrapped type either float or double? */
	public boolean isFloating() { return format >= Format.FLOAT; }
	/** Is the wrapped type either void or a reference? */
	public boolean isOther() { return (format & ~Format.SLOT_MASK) == 0; }

	/** Does the JLS 5.1.2 allow a variable of this wrapper's
	* primitive type to be assigned from a value of the given wrapper's primitive type?
	* Cases:
	* <ul>
	* <li>unboxing followed by widening primitive conversion
	* <li>any type converted to {@code void} (i.e., dropping a method call's value)
	* <li>boxing conversion followed by widening reference conversion to {@code Object}
	* </ul>
	* These are the cases allowed by MethodHandle.asType.
	*/
	public boolean isConvertibleFrom(Wrapper source) {
	if (this == source) return true;
	if (this.compareTo(source) < 0) {
	// At best, this is a narrowing conversion.
	return false;
	}
	// All conversions are allowed in the enum order between floats and signed ints.
	// First detect non-signed non-float types (boolean, char, Object, void).
	boolean floatOrSigned = (((this.format & source.format) & Format.SIGNED) != 0);
	if (!floatOrSigned) {
	if (this.isOther()) return true;
	// can convert char to int or wider, but nothing else
	if (source.format == Format.CHAR) return true;
	// no other conversions are classified as widening
	return false;
	}
	// All signed and float conversions in the enum order are widening.
	assert(this.isFloating() \|\| this.isSigned());
	assert(source.isFloating() \|\| source.isSigned());
	return true;
	}

	static { assert(checkConvertibleFrom()); }
	private static boolean checkConvertibleFrom() {
	// Check the matrix for correct classification of widening conversions.
	for (Wrapper w : values()) {
	assert(w.isConvertibleFrom(w));
	assert(VOID.isConvertibleFrom(w));
	if (w != VOID) {
	assert(OBJECT.isConvertibleFrom(w));
	assert(!w.isConvertibleFrom(VOID));
	}
	// check relations with unsigned integral types:
	if (w != CHAR) {
	assert(!CHAR.isConvertibleFrom(w));
	if (!w.isConvertibleFrom(INT))
	assert(!w.isConvertibleFrom(CHAR));
	}
	if (w != BOOLEAN) {
	assert(!BOOLEAN.isConvertibleFrom(w));
	if (w != VOID && w != OBJECT)
	assert(!w.isConvertibleFrom(BOOLEAN));
	}
	// check relations with signed integral types:
	if (w.isSigned()) {
	for (Wrapper x : values()) {
	if (w == x) continue;
	if (x.isFloating())
	assert(!w.isConvertibleFrom(x));
	else if (x.isSigned()) {
	if (w.compareTo(x) < 0)
	assert(!w.isConvertibleFrom(x));
	else
	assert(w.isConvertibleFrom(x));
	}
	}
	}
	// check relations with floating types:
	if (w.isFloating()) {
	for (Wrapper x : values()) {
	if (w == x) continue;
	if (x.isSigned())
	assert(w.isConvertibleFrom(x));
	else if (x.isFloating()) {
	if (w.compareTo(x) < 0)
	assert(!w.isConvertibleFrom(x));
	else
	assert(w.isConvertibleFrom(x));
	}
	}
	}
	}
	return true; // i.e., assert(true)
	}

	/** Produce a zero value for the given wrapper type.
	* This will be a numeric zero for a number or character,
	* false for a boolean, and null for a reference or void.
	* The common thread is that this is what is contained
	* in a default-initialized variable of the given primitive
	* type. (For void, it is what a reflective method returns
	* instead of no value at all.)
	*/
	public Object zero() { return zero; }

	/** Produce a zero value for the given wrapper type T.
	* The optional argument must a type compatible with this wrapper.
	* Equivalent to {@code this.cast(this.zero(), type)}.
	*/
	public <T> T zero(Class<T> type) { return convert(zero, type); }

	/** Return the wrapper that wraps values of the given type.
	* The type may be {@code Object}, meaning the {@code OBJECT} wrapper.
	* Otherwise, the type must be a primitive.
	* @throws IllegalArgumentException for unexpected types
	*/
	public static Wrapper forPrimitiveType(Class<?> type) {
	Wrapper w = findPrimitiveType(type);
	if (w != null) return w;
	if (type.isPrimitive())
	throw new InternalError(); // redo hash function
	throw newIllegalArgumentException("not primitive: "+type);
	}

	static Wrapper findPrimitiveType(Class<?> type) {
	Wrapper w = FROM_PRIM[hashPrim(type)];
	if (w != null && w.primitiveType == type) {
	return w;
	}
	return null;
	}

	/** Return the wrapper that wraps values into the given wrapper type.
	* If it is {@code Object}, return {@code OBJECT}.
	* Otherwise, it must be a wrapper type.
	* The type must not be a primitive type.
	* @throws IllegalArgumentException for unexpected types
	*/
	public static Wrapper forWrapperType(Class<?> type) {
	Wrapper w = findWrapperType(type);
	if (w != null) return w;
	for (Wrapper x : values())
	if (x.wrapperType == type)
	throw new InternalError(); // redo hash function
	throw newIllegalArgumentException("not wrapper: "+type);
	}

	static Wrapper findWrapperType(Class<?> type) {
	Wrapper w = FROM_WRAP[hashWrap(type)];
	if (w != null && w.wrapperType == type) {
	return w;
	}
	return null;
	}

	/** Return the wrapper that corresponds to the given bytecode
	* signature character. Return {@code OBJECT} for the character 'L'.
	* @throws IllegalArgumentException for any non-signature character or {@code '['}.
	*/
	public static Wrapper forBasicType(char type) {
	Wrapper w = FROM_CHAR[hashChar(type)];
	if (w != null && w.basicTypeChar == type) {
	return w;
	}
	for (Wrapper x : values())
	if (w.basicTypeChar == type)
	throw new InternalError(); // redo hash function
	throw newIllegalArgumentException("not basic type char: "+type);
	}

	/** Return the wrapper for the given type, if it is
	* a primitive type, else return {@code OBJECT}.
	*/
	public static Wrapper forBasicType(Class<?> type) {
	if (type.isPrimitive())
	return forPrimitiveType(type);
	return OBJECT; // any reference, including wrappers or arrays
	}

	// Note on perfect hashes:
	// for signature chars c, do (c + (c >> 1)) % 16
	// for primitive type names n, do (n[0] + n[2]) % 16
	// The type name hash works for both primitive and wrapper names.
	// You can add "java/lang/Object" to the primitive names.
	// But you add the wrapper name Object, use (n[2] + (3*n[1])) % 16.
	private static final Wrapper[] FROM_PRIM = new Wrapper[16];
	private static final Wrapper[] FROM_WRAP = new Wrapper[16];
	private static final Wrapper[] FROM_CHAR = new Wrapper[16];
	private static int hashPrim(Class<?> x) {
	String xn = x.getName();
	if (xn.length() < 3) return 0;
	return (xn.charAt(0) + xn.charAt(2)) % 16;
	}
	private static int hashWrap(Class<?> x) {
	String xn = x.getName();
	final int offset = 10; assert(offset == "java.lang.".length());
	if (xn.length() < offset+3) return 0;
	return (3*xn.charAt(offset+1) + xn.charAt(offset+2)) % 16;
	}
	private static int hashChar(char x) {
	return (x + (x >> 1)) % 16;
	}
	static {
	for (Wrapper w : values()) {
	int pi = hashPrim(w.primitiveType);
	int wi = hashWrap(w.wrapperType);
	int ci = hashChar(w.basicTypeChar);
	assert(FROM_PRIM[pi] == null);
	assert(FROM_WRAP[wi] == null);
	assert(FROM_CHAR[ci] == null);
	FROM_PRIM[pi] = w;
	FROM_WRAP[wi] = w;
	FROM_CHAR[ci] = w;
	}
	//assert(jdk.sun.invoke.util.WrapperTest.test(false));
	}

	/** What is the primitive type wrapped by this wrapper? */
	public Class<?> primitiveType() { return primitiveType; }

	/** What is the wrapper type for this wrapper? */
	public Class<?> wrapperType() { return wrapperType; }

	/** What is the wrapper type for this wrapper?
	* Otherwise, the example type must be the wrapper type,
	* or the corresponding primitive type.
	* (For {@code OBJECT}, the example type can be any non-primitive,
	* and is normalized to {@code Object.class}.)
	* The resulting class type has the same type parameter.
	*/
	public <T> Class<T> wrapperType(Class<T> exampleType) {
	if (exampleType == wrapperType) {
	return exampleType;
	} else if (exampleType == primitiveType \|\|
	wrapperType == Object.class \|\|
	exampleType.isInterface()) {
	return forceType(wrapperType, exampleType);
	}
	throw newClassCastException(exampleType, primitiveType);
	}

	private static ClassCastException newClassCastException(Class<?> actual, Class<?> expected) {
	return new ClassCastException(actual + " is not compatible with " + expected);
	}

	/** If {@code type} is a primitive type, return the corresponding
	* wrapper type, else return {@code type} unchanged.
	*/
	public static <T> Class<T> asWrapperType(Class<T> type) {
	if (type.isPrimitive()) {
	return forPrimitiveType(type).wrapperType(type);
	}
	return type;
	}

	/** If {@code type} is a wrapper type, return the corresponding
	* primitive type, else return {@code type} unchanged.
	*/
	public static <T> Class<T> asPrimitiveType(Class<T> type) {
	Wrapper w = findWrapperType(type);
	if (w != null) {
	return forceType(w.primitiveType(), type);
	}
	return type;
	}

	/** Query: Is the given type a wrapper, such as {@code Integer} or {@code Void}? */
	public static boolean isWrapperType(Class<?> type) {
	return findWrapperType(type) != null;
	}

	/** Query: Is the given type a primitive, such as {@code int} or {@code void}? */
	public static boolean isPrimitiveType(Class<?> type) {
	return type.isPrimitive();
	}

	/** What is the bytecode signature character for this type?
	* All non-primitives, including array types, report as 'L', the signature character for references.
	*/
	public static char basicTypeChar(Class<?> type) {
	if (!type.isPrimitive())
	return 'L';
	else
	return forPrimitiveType(type).basicTypeChar();
	}

	/** What is the bytecode signature character for this wrapper's
	* primitive type?
	*/
	public char basicTypeChar() { return basicTypeChar; }

	/** What is the simple name of the wrapper type?
	*/
	public String wrapperSimpleName() { return wrapperSimpleName; }

	/** What is the simple name of the primitive type?
	*/
	public String primitiveSimpleName() { return primitiveSimpleName; }

	// /** Wrap a value in the given type, which may be either a primitive or wrapper type.
	// * Performs standard primitive conversions, including truncation and float conversions.
	// */
	// public static <T> T wrap(Object x, Class<T> type) {
	// return Wrapper.valueOf(type).cast(x, type);
	// }

	/** Cast a wrapped value to the given type, which may be either a primitive or wrapper type.
	* The given target type must be this wrapper's primitive or wrapper type.
	* If this wrapper is OBJECT, the target type may also be an interface, perform no runtime check.
	* Performs standard primitive conversions, including truncation and float conversions.
	* The given type must be compatible with this wrapper. That is, it must either
	* be the wrapper type (or a subtype, in the case of {@code OBJECT}) or else
	* it must be the wrapper's primitive type.
	* Primitive conversions are only performed if the given type is itself a primitive.
	* @throws ClassCastException if the given type is not compatible with this wrapper
	*/
	public <T> T cast(Object x, Class<T> type) {
	return convert(x, type, true);
	}

	/** Convert a wrapped value to the given type.
	* The given target type must be this wrapper's primitive or wrapper type.
	* This is equivalent to {@link #cast}, except that it refuses to perform
	* narrowing primitive conversions.
	*/
	public <T> T convert(Object x, Class<T> type) {
	return convert(x, type, false);
	}

	private <T> T convert(Object x, Class<T> type, boolean isCast) {
	if (this == OBJECT) {
	// If the target wrapper is OBJECT, just do a reference cast.
	// If the target type is an interface, perform no runtime check.
	// (This loophole is safe, and is allowed by the JVM verifier.)
	// If the target type is a primitive, change it to a wrapper.
	assert(!type.isPrimitive());
	if (!type.isInterface())
	type.cast(x);
	@SuppressWarnings("unchecked")
	T result = (T) x; // unchecked warning is expected here
	return result;
	}
	Class<T> wtype = wrapperType(type);
	if (wtype.isInstance(x)) {
	return wtype.cast(x);
	}
	if (!isCast) {
	Class<?> sourceType = x.getClass(); // throw NPE if x is null
	Wrapper source = findWrapperType(sourceType);
	if (source == null \|\| !this.isConvertibleFrom(source)) {
	throw newClassCastException(wtype, sourceType);
	}
	} else if (x == null) {
	@SuppressWarnings("unchecked")
	T z = (T) zero;
	return z;
	}
	@SuppressWarnings("unchecked")
	T result = (T) wrap(x); // unchecked warning is expected here
	assert (result == null ? Void.class : result.getClass()) == wtype;
	return result;
	}

	/** Cast a reference type to another reference type.
	* If the target type is an interface, perform no runtime check.
	* (This loophole is safe, and is allowed by the JVM verifier.)
	* If the target type is a primitive, change it to a wrapper.
	*/
	static <T> Class<T> forceType(Class<?> type, Class<T> exampleType) {
	boolean z = (type == exampleType \|\|
	type.isPrimitive() && forPrimitiveType(type) == findWrapperType(exampleType) \|\|
	exampleType.isPrimitive() && forPrimitiveType(exampleType) == findWrapperType(type) \|\|
	type == Object.class && !exampleType.isPrimitive());
	if (!z)
	System.out.println(type+" <= "+exampleType);
	assert(type == exampleType \|\|
	type.isPrimitive() && forPrimitiveType(type) == findWrapperType(exampleType) \|\|
	exampleType.isPrimitive() && forPrimitiveType(exampleType) == findWrapperType(type) \|\|
	type == Object.class && !exampleType.isPrimitive());
	@SuppressWarnings("unchecked")
	Class<T> result = (Class<T>) type; // unchecked warning is expected here
	return result;
	}

	/** Wrap a value in this wrapper's type.
	* Performs standard primitive conversions, including truncation and float conversions.
	* Performs returns the unchanged reference for {@code OBJECT}.
	* Returns null for {@code VOID}.
	* Returns a zero value for a null input.
	* @throws ClassCastException if this wrapper is numeric and the operand
	* is not a number, character, boolean, or null
	*/
	public Object wrap(Object x) {
	// do non-numeric wrappers first
	switch (basicTypeChar) {
	case 'L': return x;
	case 'V': return null;
	}
	Number xn = numberValue(x);
	switch (basicTypeChar) {
	case 'I': return Integer.valueOf(xn.intValue());
	case 'J': return Long.valueOf(xn.longValue());
	case 'F': return Float.valueOf(xn.floatValue());
	case 'D': return Double.valueOf(xn.doubleValue());
	case 'S': return Short.valueOf((short) xn.intValue());
	case 'B': return Byte.valueOf((byte) xn.intValue());
	case 'C': return Character.valueOf((char) xn.intValue());
	case 'Z': return Boolean.valueOf(boolValue(xn.byteValue()));
	}
	throw new InternalError("bad wrapper");
	}

	/** Wrap a value (an int or smaller value) in this wrapper's type.
	* Performs standard primitive conversions, including truncation and float conversions.
	* Produces an {@code Integer} for {@code OBJECT}, although the exact type
	* of the operand is not known.
	* Returns null for {@code VOID}.
	*/
	public Object wrap(int x) {
	if (basicTypeChar == 'L') return (Integer)x;
	switch (basicTypeChar) {
	case 'L': throw newIllegalArgumentException("cannot wrap to object type");
	case 'V': return null;
	case 'I': return Integer.valueOf(x);
	case 'J': return Long.valueOf(x);
	case 'F': return Float.valueOf(x);
	case 'D': return Double.valueOf(x);
	case 'S': return Short.valueOf((short) x);
	case 'B': return Byte.valueOf((byte) x);
	case 'C': return Character.valueOf((char) x);
	case 'Z': return Boolean.valueOf(boolValue((byte) x));
	}
	throw new InternalError("bad wrapper");
	}

	private static Number numberValue(Object x) {
	if (x instanceof Number) return (Number)x;
	if (x instanceof Character) return (int)(Character)x;
	if (x instanceof Boolean) return (Boolean)x ? 1 : 0;
	// Remaining allowed case of void: Must be a null reference.
	return (Number)x;
	}

	// Parameter type of boolValue must be byte, because
	// MethodHandles.explicitCastArguments defines boolean
	// conversion as first converting to byte.
	private static boolean boolValue(byte bits) {
	bits &= 1; // simple 31-bit zero extension
	return (bits != 0);
	}

	private static RuntimeException newIllegalArgumentException(String message, Object x) {
	return newIllegalArgumentException(message + x);
	}
	private static RuntimeException newIllegalArgumentException(String message) {
	return new IllegalArgumentException(message);
	}

	// primitive array support
	public Object makeArray(int len) {
	return java.lang.reflect.Array.newInstance(primitiveType, len);
	}
	public Class<?> arrayType() {
	return emptyArray.getClass();
	}
	public void copyArrayUnboxing(Object[] values, int vpos, Object a, int apos, int length) {
	if (a.getClass() != arrayType())
	arrayType().cast(a); // throw NPE or CCE if bad type
	for (int i = 0; i < length; i++) {
	Object value = values[i+vpos];
	value = convert(value, primitiveType);
	java.lang.reflect.Array.set(a, i+apos, value);
	}
	}
	public void copyArrayBoxing(Object a, int apos, Object[] values, int vpos, int length) {
	if (a.getClass() != arrayType())
	arrayType().cast(a); // throw NPE or CCE if bad type
	for (int i = 0; i < length; i++) {
	Object value = java.lang.reflect.Array.get(a, i+apos);
	//Already done: value = convert(value, primitiveType);
	assert(value.getClass() == wrapperType);
	values[i+vpos] = value;
	}
	}
	}

Back to index...