1 /*
   2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * JDK-8051778: support bind on all Nashorn callables
  26  *
  27  * @test
  28  * @run
  29  */
  30 
  31 var bind = Function.prototype.bind;
  32 
  33 // Bind a POJO method
  34 var l = new java.util.ArrayList();
  35 var l_add_foo = bind.call(l.add, l, "foo");
  36 l_add_foo();
  37 print("l=" + l);
  38 
  39 // Bind a BoundCallable
  40 var l_add = bind.call(l.add, l);
  41 var l_add_foo2 = bind.call(l_add, null, "foo2");
  42 l_add_foo2();
  43 print("l=" + l);
  44 
  45 // Bind a POJO method retrieved from one instance to a different but 
  46 // compatible instance.
  47 var l2 = new java.util.ArrayList();
  48 var l2_size = bind.call(l.size, l2);
  49 print("l2_size()=" + l2_size());
  50 
  51 // Bind a Java type object (used as a constructor).
  52 var construct_two = bind.call(java.lang.Integer, null, 2);
  53 print("Bound Integer(2) constructor: " + new construct_two())
  54 
  55 // Bind a @FunctionalInterface proxying to an object literal. NOTE: the 
  56 // expected value of this.a is always "original" and never "bound". This
  57 // might seem counterintuitive, but we are not binding the apply()
  58 // function of the object literal that defines the BiFunction behaviour,
  59 // we are binding the SAM proxy object instead, and it is always
  60 // forwarding to the apply() function with "this" set to the object
  61 // literal. Basically, binding "this" for SAM proxies is useless; only
  62 // binding arguments makes sense.
  63 var f1 = new java.util.function.BiFunction() {
  64     apply: function(x, y) {
  65         return "BiFunction with literal: " + this.a + ", " + x + ", " + y;
  66     },
  67     a: "unbound"
  68 };
  69 print((bind.call(f1, {a: "bound"}))(1, 2))
  70 print((bind.call(f1, {a: "bound"}, 3))(4))
  71 print((bind.call(f1, {a: "bound"}, 5, 6))())
  72 
  73 // Bind a @FunctionalInterface proxying to a function. With the same 
  74 // reasoning as above (binding the proxy vs. binding the JS function), 
  75 // the value of this.a will always be undefined, and never "bound".
  76 var f2 = new java.util.function.BiFunction(
  77     function(x, y) {
  78         return "BiFunction with function: " + this.a + ", " + x + ", " + y;
  79     }
  80 );
  81 print((bind.call(f2, {a: "bound"}))(7, 8))
  82 print((bind.call(f2, {a: "bound"}, 9))(10))
  83 print((bind.call(f2, {a: "bound"}, 11, 12))())