nashorn/samples/find_max_lines.js
author sundar
Fri, 04 Sep 2015 17:11:06 +0530
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8135054: Add more samples to nashorn samples directory Reviewed-by: mhaupt, hannesw
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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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// Find the file with maximum number of lines
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var Files = Java.type("java.nio.file.Files");
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var Integer = Java.type("java.lang.Integer");
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var Paths = Java.type("java.nio.file.Paths");
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var file = arguments.length == 0? "." : arguments[0];
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var ext = arguments.length > 1? arguments[1] : ".java";
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var path = Paths.get(file);
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// return number of lines in given Path (that represents a file)
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function lines(p) {
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    var strm = Files.lines(p);
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    try {
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        return strm.count();
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    } finally {
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        strm.close();
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    }
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}
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// walk files, map to file and lines, find the max    
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var obj = Files.find(path, Integer.MAX_VALUE, 
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    function(p, a) !p.toFile().isDirectory() && p.toString().endsWith(ext)).
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map(function(p) ({ path : p, lines: lines(p) })).
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max(function(x, y) x.lines - y.lines).get();
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// print path and lines of the max line file
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print(obj.path, obj.lines);