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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();
+ }
+}