| /* |
| * 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; |
| |
| import jsinterop.annotations.JsPackage; |
| import jsinterop.annotations.JsProperty; |
| import jsinterop.annotations.JsType; |
| |
| /** |
| * Provides utilities to perform operations on Arrays. |
| */ |
| public class ArrayHelper { |
| |
| public static final int ARRAY_PROCESS_BATCH_SIZE = 10000; |
| |
| public static <T> 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 Object[] unsafeClone(Object array, int fromIndex, int toIndex) { |
| return asNativeArray(array).slice(fromIndex, toIndex); |
| } |
| |
| public static <T> T[] createFrom(T[] array, int length) { |
| return ArrayStamper.stampJavaTypeInfo(new NativeArray(length), array); |
| } |
| |
| public static int getLength(Object array) { |
| return asNativeArray(array).length; |
| } |
| |
| public static void setLength(Object array, int length) { |
| asNativeArray(array).length = length; |
| } |
| |
| public static void removeFrom(Object array, int index, int deleteCount) { |
| asNativeArray(array).splice(index, deleteCount); |
| } |
| |
| public static void insertTo(Object array, int index, Object value) { |
| asNativeArray(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; |
| } |
| NativeArray destArray = asNativeArray(dest); |
| 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; |
| Object[] spliceArgs = unsafeClone(src, batchStart, batchEnd); |
| asNativeArray(spliceArgs).splice(0, 0, destOfs, overwrite ? len : 0); |
| getSpliceFunction().apply(destArray, spliceArgs); |
| batchStart = batchEnd; |
| destOfs += len; |
| } |
| } |
| |
| @JsType(isNative = true, name = "Function", namespace = JsPackage.GLOBAL) |
| private static class NativeFunction { |
| public native String apply(Object thisContext, Object[] argsArray); |
| } |
| |
| @JsProperty(name = "Array.prototype.splice", namespace = "<window>") |
| private static native NativeFunction getSpliceFunction(); |
| |
| public static NativeArray asNativeArray(Object array) { |
| return JsUtils.uncheckedCast(array); |
| } |
| } |
| |