| /* |
| * Copyright (c) 2010, 2013, 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 jdk.nashorn.internal.runtime.arrays; |
| |
| import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; |
| import java.lang.reflect.Array; |
| import jdk.nashorn.internal.runtime.BitVector; |
| |
| /** |
| * This filter handles the deletion of array elements. |
| */ |
| final class DeletedArrayFilter extends ArrayFilter { |
| /** Bit vector tracking deletions. */ |
| private final BitVector deleted; |
| |
| DeletedArrayFilter(final ArrayData underlying) { |
| super(underlying); |
| this.deleted = new BitVector(underlying.length()); |
| } |
| |
| @Override |
| public ArrayData copy() { |
| final DeletedArrayFilter copy = new DeletedArrayFilter(underlying.copy()); |
| copy.getDeleted().copy(deleted); |
| return copy; |
| } |
| |
| @Override |
| public Object[] asObjectArray() { |
| final Object[] value = super.asObjectArray(); |
| |
| for (int i = 0; i < value.length; i++) { |
| if (deleted.isSet(i)) { |
| value[i] = UNDEFINED; |
| } |
| } |
| |
| return value; |
| } |
| |
| @Override |
| public Object asArrayOfType(final Class<?> componentType) { |
| final Object value = super.asArrayOfType(componentType); |
| final Object undefValue = convertUndefinedValue(componentType); |
| final int l = Array.getLength(value); |
| for (int i = 0; i < l; i++) { |
| if (deleted.isSet(i)) { |
| Array.set(value, i, undefValue); |
| } |
| } |
| |
| return value; |
| } |
| |
| @Override |
| public ArrayData shiftLeft(final int by) { |
| super.shiftLeft(by); |
| deleted.shiftLeft(by, length()); |
| return this; |
| } |
| |
| @Override |
| public ArrayData shiftRight(final int by) { |
| super.shiftRight(by); |
| deleted.shiftRight(by, length()); |
| return this; |
| } |
| |
| @Override |
| public ArrayData ensure(final long safeIndex) { |
| if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH && safeIndex >= length()) { |
| return new SparseArrayData(this, safeIndex + 1); |
| } |
| |
| super.ensure(safeIndex); |
| deleted.resize(length()); |
| |
| return this; |
| } |
| |
| @Override |
| public ArrayData shrink(final long newLength) { |
| super.shrink(newLength); |
| deleted.resize(length()); |
| return this; |
| } |
| |
| @Override |
| public ArrayData set(final int index, final Object value, final boolean strict) { |
| deleted.clear(ArrayIndex.toLongIndex(index)); |
| return super.set(index, value, strict); |
| } |
| |
| @Override |
| public ArrayData set(final int index, final int value, final boolean strict) { |
| deleted.clear(ArrayIndex.toLongIndex(index)); |
| return super.set(index, value, strict); |
| } |
| |
| @Override |
| public ArrayData set(final int index, final double value, final boolean strict) { |
| deleted.clear(ArrayIndex.toLongIndex(index)); |
| return super.set(index, value, strict); |
| } |
| |
| @Override |
| public boolean has(final int index) { |
| return super.has(index) && deleted.isClear(ArrayIndex.toLongIndex(index)); |
| } |
| |
| @Override |
| public ArrayData delete(final int index) { |
| final long longIndex = ArrayIndex.toLongIndex(index); |
| assert longIndex >= 0 && longIndex < length(); |
| deleted.set(longIndex); |
| underlying.setEmpty(index); |
| return this; |
| } |
| |
| @Override |
| public ArrayData delete(final long fromIndex, final long toIndex) { |
| assert fromIndex >= 0 && fromIndex <= toIndex && toIndex < length(); |
| deleted.setRange(fromIndex, toIndex + 1); |
| underlying.setEmpty(fromIndex, toIndex); |
| return this; |
| } |
| |
| @Override |
| public Object pop() { |
| final long index = length() - 1; |
| |
| if (super.has((int)index)) { |
| final boolean isDeleted = deleted.isSet(index); |
| final Object value = super.pop(); |
| |
| return isDeleted ? UNDEFINED : value; |
| } |
| |
| return super.pop(); |
| } |
| |
| @Override |
| public ArrayData slice(final long from, final long to) { |
| final ArrayData newArray = underlying.slice(from, to); |
| final DeletedArrayFilter newFilter = new DeletedArrayFilter(newArray); |
| newFilter.getDeleted().copy(deleted); |
| newFilter.getDeleted().shiftLeft(from, newFilter.length()); |
| |
| return newFilter; |
| } |
| |
| private BitVector getDeleted() { |
| return deleted; |
| } |
| } |