nashorn/samples/call_bind_java.js
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     1 /*
       
     2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
       
     3  *
       
     4  * Redistribution and use in source and binary forms, with or without
       
     5  * modification, are permitted provided that the following conditions
       
     6  * are met:
       
     7  *
       
     8  *   - Redistributions of source code must retain the above copyright
       
     9  *     notice, this list of conditions and the following disclaimer.
       
    10  *
       
    11  *   - Redistributions in binary form must reproduce the above copyright
       
    12  *     notice, this list of conditions and the following disclaimer in the
       
    13  *     documentation and/or other materials provided with the distribution.
       
    14  *
       
    15  *   - Neither the name of Oracle nor the names of its
       
    16  *     contributors may be used to endorse or promote products derived
       
    17  *     from this software without specific prior written permission.
       
    18  *
       
    19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
       
    20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
       
    21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
       
    22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
       
    23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
       
    24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
       
    25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
       
    26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
       
    27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
       
    28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
       
    29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
       
    30  */
       
    31 
       
    32 // Sample demonstrating calling Java methods like normal
       
    33 // functions. Bound instance methods, static methods can be
       
    34 // called like normal script functions.
       
    35 
       
    36 // Java types used
       
    37 var Files = Java.type("java.nio.file.Files");
       
    38 var FileSystems = Java.type("java.nio.file.FileSystems");
       
    39 var System = Java.type("java.lang.System");
       
    40 
       
    41 var fs = FileSystems.default;
       
    42 var bind = Function.prototype.bind;
       
    43 
       
    44 // Java methods as "functions"
       
    45 
       
    46 // Java method with bound "this"
       
    47 var Path = bind.call(fs.getPath, fs);
       
    48 // Java static method
       
    49 var Property = System.getProperty;
       
    50 
       
    51 // call Java static methods and bound instance methods
       
    52 // like normal script functions.
       
    53 
       
    54 var root = Path("/");
       
    55 // print URI for root dir
       
    56 print(root.toUri());
       
    57 var home = Path(Property("user.home"));
       
    58 // list home directory
       
    59 Files.walk(home).forEach(print);