Examples of java.lang.invoke.MethodHandle.bindTo()

java.lang.invoke.MethodHandle.bindTo()
Binds a value {@code x} to the first argument of a method handle, without invoking it.The new method handle adapts, as its target, the current method handle by binding it to the given argument. The type of the bound handle will be the same as the type of the target, except that a single leading reference parameter will be omitted.
When called, the bound handle inserts the given value {@code x}as a new leading argument to the target. The other arguments are also passed unchanged. What the target eventually returns is returned unchanged by the bound handle.
The reference {@code x} must be convertible to the first parametertype of the target.
(Note: Because method handles are immutable, the target method handle retains its original type and behavior.) @param x the value to bind to the first argument of the target @return a new method handle which prepends the given value to the incomingargument list, before calling the original method handle @throws IllegalArgumentException if the target does not have aleading parameter type that is a reference type @throws ClassCastException if {@code x} cannot be convertedto the leading parameter type of the target @see MethodHandles#insertArguments

  }


  public static Object perform_withArguments_(Object receiver,
      Symbol selector, Object[] arguments) throws Throwable {
    MethodHandle handle = getHandle(receiver, selector);
    return handle.bindTo(receiver).invokeWithArguments(arguments);
  }


  public static Object perform(Object receiver, String selector)
      throws Throwable {
    MethodHandle handle = getHandle(receiver, selector);

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            if (optimize && !function.isDeterministic()) {
                return new FunctionCall(node.getName(), node.getWindow().orNull(), node.isDistinct(), toExpressions(argumentValues));
            }
            MethodHandle handle = function.getScalarFunction();
            if (handle.type().parameterCount() > 0 && handle.type().parameterType(0) == Session.class) {
                handle = handle.bindTo(session);
            }
            try {
                return handle.invokeWithArguments(argumentValues);
            }
            catch (Throwable throwable) {

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            if (optimize && !function.isDeterministic()) {
                return new FunctionCall(node.getName(), node.getWindow().orNull(), node.isDistinct(), toExpressions(argumentValues));
            }
            MethodHandle handle = function.getScalarFunction();
            if (handle.type().parameterCount() > 0 && handle.type().parameterType(0) == Session.class) {
                handle = handle.bindTo(session);
            }
            try {
                return handle.invokeWithArguments(argumentValues);
            }
            catch (Throwable throwable) {

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            handle = lookup.findStatic(InvokeDynamicSupport.class, "setVariableFallback", methodType(IRubyObject.class, VariableSite.class, IRubyObject.class, IRubyObject.class));
        } else {
            throw new RuntimeException("invalid variable access type");
        }
        
        handle = handle.bindTo(site);
        site.setTarget(handle);
        
        return site;
    }

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        // prepare fallback
        MethodHandle fallback = null;
        if (site.chainCount() > RubyInstanceConfig.MAX_POLY_COUNT) {
            if (RubyInstanceConfig.LOG_INDY_BINDINGS) LOG.info(site.name + "\tqet on type " + self.getMetaClass().id + " failed (polymorphic)" + extractSourceInfo(site));
            fallback = findStatic(InvokeDynamicSupport.class, "getVariableFail", methodType(IRubyObject.class, VariableSite.class, IRubyObject.class));
            fallback = fallback.bindTo(site);
            site.setTarget(fallback);
            return (IRubyObject)fallback.invokeWithArguments(self);
        } else {
            if (RubyInstanceConfig.LOG_INDY_BINDINGS) LOG.info(site.name + "\tget on type " + self.getMetaClass().id + " added to PIC" + extractSourceInfo(site));
            fallback = site.getTarget();

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        // prepare fallback
        MethodHandle fallback = null;
        if (site.chainCount() > RubyInstanceConfig.MAX_POLY_COUNT) {
            if (RubyInstanceConfig.LOG_INDY_BINDINGS) LOG.info(site.name + "\tset on type " + self.getMetaClass().id + " failed (polymorphic)" + extractSourceInfo(site));
            fallback = findStatic(InvokeDynamicSupport.class, "setVariableFail", methodType(IRubyObject.class, VariableSite.class, IRubyObject.class, IRubyObject.class));
            fallback = fallback.bindTo(site);
            site.setTarget(fallback);
            return (IRubyObject)fallback.invokeWithArguments(self, value);
        } else {
            if (RubyInstanceConfig.LOG_INDY_BINDINGS) LOG.info(site.name + "\tset on type " + self.getMetaClass().id + " added to PIC" + extractSourceInfo(site));
            fallback = site.getTarget();

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            handle = lookup.findStatic(InvokeDynamicSupport.class, "getGlobalFallback", methodType(IRubyObject.class, GlobalSite.class, ThreadContext.class));
        } else {
            throw new RuntimeException("invalid variable access type");
        }
        
        handle = handle.bindTo(site);
        site.setTarget(handle);
        
        return site;
    }

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            handle = lookup.findStatic(InvokeDynamicSupport.class, "getGlobalBooleanFallback", methodType(boolean.class, GlobalSite.class, ThreadContext.class));
        } else {
            throw new RuntimeException("invalid variable access type");
        }
        
        handle = handle.bindTo(site);
        site.setTarget(handle);
        
        return site;
    }

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        IRubyObject value = variable.getAccessor().getValue();
        
        MethodHandle target = constant(IRubyObject.class, value);
        target = dropArguments(target, 0, ThreadContext.class);
        MethodHandle fallback = lookup().findStatic(InvokeDynamicSupport.class, "getGlobalFallback", methodType(IRubyObject.class, GlobalSite.class, ThreadContext.class));
        fallback = fallback.bindTo(site);
        
        target = ((SwitchPoint)invalidator.getData()).guardWithTest(target, fallback);
        
        site.setTarget(target);

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        boolean value = variable.getAccessor().getValue().isTrue();
        
        MethodHandle target = constant(boolean.class, value);
        target = dropArguments(target, 0, ThreadContext.class);
        MethodHandle fallback = lookup().findStatic(InvokeDynamicSupport.class, "getGlobalBooleanFallback", methodType(boolean.class, GlobalSite.class, ThreadContext.class));
        fallback = fallback.bindTo(site);
        
        target = ((SwitchPoint)invalidator.getData()).guardWithTest(target, fallback);
        
        site.setTarget(target);

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