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/*
* Copyright 2015 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package javaemul.internal;
/**
* Provides utilities to perform operations on Arrays.
*/
public class ArrayHelper {
public static final int ARRAY_PROCESS_BATCH_SIZE = 10000;
public static T[] clone(T[] array, int fromIndex, int toIndex) {
Object result = unsafeClone(array, fromIndex, toIndex);
return ArrayStamper.stampJavaTypeInfo(result, array);
}
/**
* Unlike clone, this method returns a copy of the array that is not type marked. This is only
* safe for temp arrays as returned array will not do any type checks.
*/
public static native Object unsafeClone(Object array, int fromIndex, int toIndex) /*-{
return array.slice(fromIndex, toIndex);
}-*/;
public static T[] createFrom(T[] array, int length) {
Object result = createNativeArray(length);
return ArrayStamper.stampJavaTypeInfo(result, array);
}
private static native Object createNativeArray(int length)/*-{
return new Array(length);
}-*/;
public static native int getLength(Object array) /*-{
return array.length;
}-*/;
public static native void setLength(Object array, int length)/*-{
array.length = length;
}-*/;
public static native void removeFrom(Object array, int index, int deleteCount) /*-{
array.splice(index, deleteCount);
}-*/;
public static native void insertTo(Object array, int index, Object value) /*-{
array.splice(index, 0, value);
}-*/;
public static void insertTo(Object array, int index, Object[] values) {
copy(values, 0, array, index, values.length, false);
}
public static void copy(Object array, int srcOfs, Object dest, int destOfs, int len) {
copy(array, srcOfs, dest, destOfs, len, true);
}
private static void copy(
Object src, int srcOfs, Object dest, int destOfs, int len, boolean overwrite) {
/*
* Array.prototype.splice is not used directly to overcome the limits imposed to the number of
* function parameters by browsers.
*/
if (src == dest) {
// copying to the same array, make a copy first
src = unsafeClone(src, srcOfs, srcOfs + len);
srcOfs = 0;
}
for (int batchStart = srcOfs, end = srcOfs + len; batchStart < end;) {
// increment in block
int batchEnd = Math.min(batchStart + ARRAY_PROCESS_BATCH_SIZE, end);
len = batchEnd - batchStart;
applySplice(dest, destOfs, overwrite ? len : 0, unsafeClone(src, batchStart, batchEnd));
batchStart = batchEnd;
destOfs += len;
}
}
private static native void applySplice(Object array, int index, int deleteCount,
Object arrayToAdd) /*-{
Array.prototype.splice.apply(array, [index, deleteCount].concat(arrayToAdd));
}-*/;
}
