| /* |
| * 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 java.util.Iterator; |
| import java.util.List; |
| import jdk.nashorn.api.scripting.JSObject; |
| import jdk.nashorn.internal.runtime.JSType; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| |
| /** |
| * Superclass for array iterators |
| * TODO: rewrite these |
| * |
| * @param <T> element type |
| */ |
| abstract public class ArrayLikeIterator<T> implements Iterator<T> { |
| |
| /** current element index in iteration */ |
| protected long index; |
| |
| /** should undefined elements be included in the iteration? */ |
| protected final boolean includeUndefined; |
| |
| /** |
| * Constructor |
| * |
| * @param includeUndefined should undefined elements be included in the iteration? |
| */ |
| ArrayLikeIterator(final boolean includeUndefined) { |
| this.includeUndefined = includeUndefined; |
| this.index = 0; |
| } |
| |
| /** |
| * Is this a reverse order iteration? |
| * @return true if reverse |
| */ |
| public boolean isReverse() { |
| return false; |
| } |
| |
| /** |
| * Go the the next valid element index of the iterator |
| * @return next index |
| */ |
| protected long bumpIndex() { |
| return index++; |
| } |
| |
| /** |
| * Return the next valid element index of the iterator |
| * @return next index |
| */ |
| public long nextIndex() { |
| return index; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException("remove"); |
| } |
| |
| /** |
| * Get the length of the iteration |
| * @return length |
| */ |
| public abstract long getLength(); |
| |
| /** |
| * ArrayLikeIterator factory |
| * |
| * @param object object over which to do element iteration |
| * @return iterator |
| */ |
| public static ArrayLikeIterator<Object> arrayLikeIterator(final Object object) { |
| return arrayLikeIterator(object, false); |
| } |
| |
| /** |
| * ArrayLikeIterator factory (reverse order) |
| * @param object object over which to do reverse element iteration |
| * @return iterator |
| */ |
| public static ArrayLikeIterator<Object> reverseArrayLikeIterator(final Object object) { |
| return reverseArrayLikeIterator(object, false); |
| } |
| |
| /** |
| * ArrayLikeIterator factory |
| * @param object object over which to do reverse element iteration |
| * @param includeUndefined should undefined elements be included in the iteration |
| * @return iterator |
| */ |
| public static ArrayLikeIterator<Object> arrayLikeIterator(final Object object, final boolean includeUndefined) { |
| Object obj = object; |
| |
| if (ScriptObject.isArray(obj)) { |
| return new ScriptArrayIterator((ScriptObject) obj, includeUndefined); |
| } |
| |
| obj = JSType.toScriptObject(obj); |
| if (obj instanceof ScriptObject) { |
| return new ScriptObjectIterator((ScriptObject)obj, includeUndefined); |
| } |
| |
| if (obj instanceof JSObject) { |
| return new JSObjectIterator((JSObject)obj, includeUndefined); |
| } |
| |
| if (obj instanceof List) { |
| return new JavaListIterator((List<?>)obj, includeUndefined); |
| } |
| |
| if (obj != null && obj.getClass().isArray()) { |
| return new JavaArrayIterator(obj, includeUndefined); |
| } |
| |
| return new EmptyArrayLikeIterator(); |
| } |
| |
| /** |
| * ArrayLikeIterator factory (reverse order) |
| * @param object object over which to do reverse element iteration |
| * @param includeUndefined should undefined elements be included in the iteration |
| * @return iterator |
| */ |
| public static ArrayLikeIterator<Object> reverseArrayLikeIterator(final Object object, final boolean includeUndefined) { |
| Object obj = object; |
| |
| if (ScriptObject.isArray(obj)) { |
| return new ReverseScriptArrayIterator((ScriptObject) obj, includeUndefined); |
| } |
| |
| obj = JSType.toScriptObject(obj); |
| if (obj instanceof ScriptObject) { |
| return new ReverseScriptObjectIterator((ScriptObject)obj, includeUndefined); |
| } |
| |
| if (obj instanceof JSObject) { |
| return new ReverseJSObjectIterator((JSObject)obj, includeUndefined); |
| } |
| |
| if (obj instanceof List) { |
| return new ReverseJavaListIterator((List<?>)obj, includeUndefined); |
| } |
| |
| if (obj != null && obj.getClass().isArray()) { |
| return new ReverseJavaArrayIterator(obj, includeUndefined); |
| } |
| |
| return new EmptyArrayLikeIterator(); |
| } |
| |
| } |