nashorn/samples/jsadapter-fallthrough.js
author rriggs
Wed, 12 Oct 2016 12:56:35 -0400
changeset 43211 f264afd5082c
parent 33005 19c2fe67d821
permissions -rw-r--r--
8156802: Better constraint checking Reviewed-by: dfuchs
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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// Demonstrate how to provide a default fall-through solution for adapted Java
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// objects, forwarding all calls that are not adapted.
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var Date = Java.type('java.time.LocalDate')
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function wrapDate(d) {
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    return new JSAdapter() {
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        __call__: function() {
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            // adapted (extra) methods
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            if (arguments[0] === 'yesterday') {
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                return d.minusDays(1)
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            }
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            // fall-through: forward all other, non-adapted method calls
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            var args = [d].concat(Array.prototype.slice.call(arguments, 1)) 
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            return Function.call.apply(d[arguments[0]], args)
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        }
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    }
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}
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var now = wrapDate(Date.now())
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print(now)
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print(now.yesterday()) // adapted
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print(now.lengthOfMonth()) // fall through to original method
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print(now.atTime(23, 42)) // arguments are passed through
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