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/*
* 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();
}
}
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