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	/*
	* Copyright (c) 1998, 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 com.sun.tools.jdi;

	import com.sun.jdi.*;

	import java.util.List;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Iterator;

	public class ArrayReferenceImpl extends ObjectReferenceImpl
	implements ArrayReference
	{
	int length = -1;

	ArrayReferenceImpl(VirtualMachine aVm,long aRef) {
	super(aVm,aRef);
	}

	protected ClassTypeImpl invokableReferenceType(Method method) {
	// The method has to be a method on Object since
	// arrays don't have methods nor any other 'superclasses'
	// So, use the ClassTypeImpl for Object instead of
	// the ArrayTypeImpl for the array itself.
	return (ClassTypeImpl)method.declaringType();
	}

	ArrayTypeImpl arrayType() {
	return (ArrayTypeImpl)type();
	}

	/**
	* Return array length.
	* Need not be synchronized since it cannot be provably stale.
	*/
	public int length() {
	if(length == -1) {
	try {
	length = JDWP.ArrayReference.Length.
	process(vm, this).arrayLength;
	} catch (JDWPException exc) {
	throw exc.toJDIException();
	}
	}
	return length;
	}

	public Value getValue(int index) {
	List<Value> list = getValues(index, 1);
	return list.get(0);
	}

	public List<Value> getValues() {
	return getValues(0, -1);
	}

	/**
	* Validate that the range to set/get is valid.
	* length of -1 (meaning rest of array) has been converted
	* before entry.
	*/
	private void validateArrayAccess(int index, int length) {
	// because length can be computed from index,
	// index must be tested first for correct error message
	if ((index < 0) \|\| (index > length())) {
	throw new IndexOutOfBoundsException(
	"Invalid array index: " + index);
	}
	if (length < 0) {
	throw new IndexOutOfBoundsException(
	"Invalid array range length: " + length);
	}
	if (index + length > length()) {
	throw new IndexOutOfBoundsException(
	"Invalid array range: " +
	index + " to " + (index + length - 1));
	}
	}

	@SuppressWarnings("unchecked")
	private static <T> T cast(Object x) {
	return (T)x;
	}

	public List<Value> getValues(int index, int length) {
	if (length == -1) { // -1 means the rest of the array
	length = length() - index;
	}
	validateArrayAccess(index, length);
	if (length == 0) {
	return new ArrayList<Value>();
	}

	List<Value> vals;
	try {
	vals = cast(JDWP.ArrayReference.GetValues.process(vm, this, index, length).values);
	} catch (JDWPException exc) {
	throw exc.toJDIException();
	}

	return vals;
	}

	public void setValue(int index, Value value)
	throws InvalidTypeException,
	ClassNotLoadedException {
	List<Value> list = new ArrayList<Value>(1);
	list.add(value);
	setValues(index, list, 0, 1);
	}

	public void setValues(List<? extends Value> values)
	throws InvalidTypeException,
	ClassNotLoadedException {
	setValues(0, values, 0, -1);
	}

	public void setValues(int index, List<? extends Value> values,
	int srcIndex, int length)
	throws InvalidTypeException,
	ClassNotLoadedException {

	if (length == -1) { // -1 means the rest of the array
	// shorter of, the rest of the array and rest of
	// the source values
	length = Math.min(length() - index,
	values.size() - srcIndex);
	}
	validateMirrorsOrNulls(values);
	validateArrayAccess(index, length);

	if ((srcIndex < 0) \|\| (srcIndex > values.size())) {
	throw new IndexOutOfBoundsException(
	"Invalid source index: " + srcIndex);
	}
	if (srcIndex + length > values.size()) {
	throw new IndexOutOfBoundsException(
	"Invalid source range: " +
	srcIndex + " to " +
	(srcIndex + length - 1));
	}

	boolean somethingToSet = false;;
	ValueImpl[] setValues = new ValueImpl[length];

	for (int i = 0; i < length; i++) {
	ValueImpl value = (ValueImpl)values.get(srcIndex + i);

	try {
	// Validate and convert if necessary
	setValues[i] =
	ValueImpl.prepareForAssignment(value,
	new Component());
	somethingToSet = true;
	} catch (ClassNotLoadedException e) {
	/*
	* Since we got this exception,
	* the component must be a reference type.
	* This means the class has not yet been loaded
	* through the defining class's class loader.
	* If the value we're trying to set is null,
	* then setting to null is essentially a
	* no-op, and we should allow it without an
	* exception.
	*/
	if (value != null) {
	throw e;
	}
	}
	}
	if (somethingToSet) {
	try {
	JDWP.ArrayReference.SetValues.
	process(vm, this, index, setValues);
	} catch (JDWPException exc) {
	throw exc.toJDIException();
	}
	}
	}

	public String toString() {
	return "instance of " + arrayType().componentTypeName() +
	"[" + length() + "] (id=" + uniqueID() + ")";
	}

	byte typeValueKey() {
	return JDWP.Tag.ARRAY;
	}

	void validateAssignment(ValueContainer destination)
	throws InvalidTypeException, ClassNotLoadedException {
	try {
	super.validateAssignment(destination);
	} catch (ClassNotLoadedException e) {
	/*
	* An array can be used extensively without the
	* enclosing loader being recorded by the VM as an
	* initiating loader of the array type. In addition, the
	* load of an array class is fairly harmless as long as
	* the component class is already loaded. So we relax the
	* rules a bit and allow the assignment as long as the
	* ultimate component types are assignable.
	*/
	boolean valid = false;
	JNITypeParser destParser = new JNITypeParser(
	destination.signature());
	JNITypeParser srcParser = new JNITypeParser(
	arrayType().signature());
	int destDims = destParser.dimensionCount();
	if (destDims <= srcParser.dimensionCount()) {
	/*
	* Remove all dimensions from the destination. Remove
	* the same number of dimensions from the source.
	* Get types for both and check to see if they are
	* compatible.
	*/
	String destComponentSignature =
	destParser.componentSignature(destDims);
	Type destComponentType =
	destination.findType(destComponentSignature);
	String srcComponentSignature =
	srcParser.componentSignature(destDims);
	Type srcComponentType =
	arrayType().findComponentType(srcComponentSignature);
	valid = ArrayTypeImpl.isComponentAssignable(destComponentType,
	srcComponentType);
	}

	if (!valid) {
	throw new InvalidTypeException("Cannot assign " +
	arrayType().name() +
	" to " +
	destination.typeName());
	}
	}
	}

	/*
	* Represents an array component to other internal parts of this
	* implementation. This is not exposed at the JDI level. Currently,
	* this class is needed only for type checking so it does not even
	* reference a particular component - just a generic component
	* of this array. In the future we may need to expand its use.
	*/
	class Component implements ValueContainer {
	public Type type() throws ClassNotLoadedException {
	return arrayType().componentType();
	}
	public String typeName() {
	return arrayType().componentTypeName();
	}
	public String signature() {
	return arrayType().componentSignature();
	}
	public Type findType(String signature) throws ClassNotLoadedException {
	return arrayType().findComponentType(signature);
	}
	}
	}

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