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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 jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.ScriptRuntime;
import jdk.nashorn.internal.runtime.linker.Bootstrap;
/**
* Helper class for the various map/apply functions in {@link jdk.nashorn.internal.objects.NativeArray}.
* @param <T> element type of results from application callback
*/
public abstract class IteratorAction<T> {
/** Self object */
protected final Object self;
/** This for the callback invocation */
protected Object thisArg;
/** Callback function to be applied to elements */
protected final Object callbackfn;
/** Result of array iteration */
protected T result;
/** Current array index of iterator */
protected long index;
/** Iterator object */
private final ArrayLikeIterator<Object> iter;
/**
* Constructor
*
* @param self self reference to array object
* @param callbackfn callback function for each element
* @param thisArg the reference
* @param initialResult result accumulator initialization
*/
public IteratorAction(final Object self, final Object callbackfn, final Object thisArg, final T initialResult) {
this(self, callbackfn, thisArg, initialResult, ArrayLikeIterator.arrayLikeIterator(self));
}
/**
* Constructor
*
* @param self self reference to array object
* @param callbackfn callback function for each element
* @param thisArg the reference
* @param initialResult result accumulator initialization
* @param iter custom element iterator
*/
public IteratorAction(final Object self, final Object callbackfn, final Object thisArg, final T initialResult, final ArrayLikeIterator<Object> iter) {
this.self = self;
this.callbackfn = callbackfn;
this.result = initialResult;
this.iter = iter;
this.thisArg = thisArg;
}
/**
* An action to be performed once at the start of the apply loop
* @param iterator array element iterator
*/
protected void applyLoopBegin(final ArrayLikeIterator<Object> iterator) {
//empty
}
/**
* Apply action main loop.
* @return result of apply
*/
public final T apply() {
final boolean strict = Bootstrap.isStrictCallable(callbackfn);
// for non-strict callback, need to translate undefined thisArg to be global object
thisArg = (thisArg == ScriptRuntime.UNDEFINED && !strict)? Context.getGlobal() : thisArg;
applyLoopBegin(iter);
final boolean reverse = iter.isReverse();
while (iter.hasNext()) {
final Object val = iter.next();
index = iter.nextIndex() + (reverse ? 1 : -1);
try {
if (!forEach(val, index)) {
return result;
}
} catch (final RuntimeException | Error e) {
throw e;
} catch (final Throwable t) {
throw new RuntimeException(t);
}
}
return result;
}
/**
* For each callback
*
* @param val value
* @param i position of value
*
* @return true if callback invocation return true
*
* @throws Throwable if invocation throws an exception/error
*/
protected abstract boolean forEach(final Object val, final double i) throws Throwable;
}
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