diff options
Diffstat (limited to 'src/jdk/nashorn/internal/runtime/linker/BoundCallable.java')
-rw-r--r-- | src/jdk/nashorn/internal/runtime/linker/BoundCallable.java | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/jdk/nashorn/internal/runtime/linker/BoundCallable.java b/src/jdk/nashorn/internal/runtime/linker/BoundCallable.java new file mode 100644 index 00000000..a0eee0de --- /dev/null +++ b/src/jdk/nashorn/internal/runtime/linker/BoundCallable.java @@ -0,0 +1,96 @@ +/* + * 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(); + } +} |