1 #// Usage: jjs javafoovars.js -- <directory>
   2 
   3 /*
   4  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  *   - Redistributions of source code must retain the above copyright
  11  *     notice, this list of conditions and the following disclaimer.
  12  *
  13  *   - Redistributions in binary form must reproduce the above copyright
  14  *     notice, this list of conditions and the following disclaimer in the
  15  *     documentation and/or other materials provided with the distribution.
  16  *
  17  *   - Neither the name of Oracle nor the names of its
  18  *     contributors may be used to endorse or promote products derived
  19  *     from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  22  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 
  34 // This example demonstrates Java subclassing by Java.extend
  35 // and javac Compiler and Tree API. This example counts number
  36 // of variables called "foo" in the given java source files!
  37 if (arguments.length == 0) {
  38     print("Usage: jjs javafoovars.js -- <directory>");
  39     exit(1);
  40 }
  41 
  42 // Java types used
  43 var File = Java.type("java.io.File");
  44 var Files = Java.type("java.nio.file.Files");
  45 var StringArray = Java.type("java.lang.String[]");
  46 var ToolProvider = Java.type("javax.tools.ToolProvider");
  47 var Tree = Java.type("com.sun.source.tree.Tree");
  48 var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
  49 var VariableTree = Java.type("com.sun.source.tree.VariableTree");
  50 
  51 // count "foo"-s in the given .java files
  52 function countFoo() {
  53     // get the system compiler tool
  54     var compiler = ToolProvider.systemJavaCompiler;
  55     // get standard file manager
  56     var fileMgr = compiler.getStandardFileManager(null, null, null);
  57     // Using Java.to convert script array (arguments) to a Java String[]
  58     var compUnits = fileMgr.getJavaFileObjects(
  59         Java.to(arguments, StringArray));
  60     // create a new compilation task
  61     var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
  62     // subclass SimpleTreeVisitor - to count variables called "foo"
  63     var FooCounterVisitor = Java.extend(TreeScanner);
  64     var fooCount = 0;
  65 
  66     var visitor = new FooCounterVisitor() {
  67         visitVariable: function (node, p) {
  68             if (node.name.toString() == "foo") {
  69                 fooCount++;
  70             }
  71         }
  72     }
  73 
  74     for each (var cu in task.parse()) {
  75         cu.accept(visitor, null);
  76     }
  77     return fooCount;
  78 }
  79 
  80 // for each ".java" file in directory (recursively) count "foo".
  81 function main(dir) {
  82     var totalCount = 0;
  83     Files.walk(dir.toPath()).
  84       forEach(function(p) {
  85         var name = p.toFile().absolutePath;
  86         if (name.endsWith(".java")) {
  87             var count = 0;
  88             try {
  89                 count = countFoo(p.toFile().getAbsolutePath());
  90             } catch (e) {
  91                 print(e);
  92             }
  93             if (count != 0) {
  94                 print(name + ": " + count);
  95             }
  96             totalCount += count;
  97         }
  98       });
  99     print("Total foo count: " + totalCount);
 100 }
 101 
 102 main(new File(arguments[0]));