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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.linker;
import java.util.Arrays;
import jdk.nashorn.internal.runtime.ScriptRuntime;
/**
* Represents a Nashorn callable bound to a receiver and optionally arguments. Note that objects of this class
* are just the tuples of a callable and a bound this and arguments, without any behavior. All the behavior is
* defined in the {@code BoundCallableLinker}.
*/
public final class BoundCallable {
private final Object callable;
private final Object boundThis;
private final Object[] boundArgs;
BoundCallable(final Object callable, final Object boundThis, final Object[] boundArgs) {
this.callable = callable;
this.boundThis = boundThis;
this.boundArgs = isEmptyArray(boundArgs) ? ScriptRuntime.EMPTY_ARRAY : boundArgs.clone();
}
private BoundCallable(final BoundCallable original, final Object[] extraBoundArgs) {
this.callable = original.callable;
this.boundThis = original.boundThis;
this.boundArgs = original.concatenateBoundArgs(extraBoundArgs);
}
Object getCallable() {
return callable;
}
Object getBoundThis() {
return boundThis;
}
Object[] getBoundArgs() {
return boundArgs;
}
BoundCallable bind(final Object[] extraBoundArgs) {
if (isEmptyArray(extraBoundArgs)) {
return this;
}
return new BoundCallable(this, extraBoundArgs);
}
private Object[] concatenateBoundArgs(final Object[] extraBoundArgs) {
if (boundArgs.length == 0) {
return extraBoundArgs.clone();
}
final int origBoundArgsLen = boundArgs.length;
final int extraBoundArgsLen = extraBoundArgs.length;
final Object[] newBoundArgs = new Object[origBoundArgsLen + extraBoundArgsLen];
System.arraycopy(boundArgs, 0, newBoundArgs, 0, origBoundArgsLen);
System.arraycopy(extraBoundArgs, 0, newBoundArgs, origBoundArgsLen, extraBoundArgsLen);
return newBoundArgs;
}
private static boolean isEmptyArray(final Object[] a) {
return a == null || a.length == 0;
}
@Override
public String toString() {
final StringBuilder b = new StringBuilder(callable.toString()).append(" on ").append(boundThis);
if (boundArgs.length != 0) {
b.append(" with ").append(Arrays.toString(boundArgs));
}
return b.toString();
}
}
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