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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 BoundCallableLinker.
/** * 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(); } }