1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/resourcetrysuggester.js Tue Sep 15 16:17:33 2015 +0530
1.3 @@ -0,0 +1,156 @@
1.4 +#// Usage: jjs resourcetrysuggester.js -- <directory>
1.5 +
1.6 +/*
1.7 + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
1.8 + *
1.9 + * Redistribution and use in source and binary forms, with or without
1.10 + * modification, are permitted provided that the following conditions
1.11 + * are met:
1.12 + *
1.13 + * - Redistributions of source code must retain the above copyright
1.14 + * notice, this list of conditions and the following disclaimer.
1.15 + *
1.16 + * - Redistributions in binary form must reproduce the above copyright
1.17 + * notice, this list of conditions and the following disclaimer in the
1.18 + * documentation and/or other materials provided with the distribution.
1.19 + *
1.20 + * - Neither the name of Oracle nor the names of its
1.21 + * contributors may be used to endorse or promote products derived
1.22 + * from this software without specific prior written permission.
1.23 + *
1.24 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
1.25 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
1.26 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.27 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.28 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.29 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.30 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.31 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.32 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.33 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.34 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.35 + */
1.36 +
1.37 +// This example demonstrates Java subclassing by Java.extend
1.38 +// and javac Compiler and Tree API. This example looks for
1.39 +// finally clauses with "close" call and suggests "resource try"!
1.40 +
1.41 +if (arguments.length == 0) {
1.42 + print("Usage: jjs resourcetrysuggester.js -- <directory>");
1.43 + exit(1);
1.44 +}
1.45 +
1.46 +// Java types used
1.47 +var ExpressionStatementTree = Java.type("com.sun.source.tree.ExpressionStatementTree");
1.48 +var File = Java.type("java.io.File");
1.49 +var Files = Java.type("java.nio.file.Files");
1.50 +var MemberSelectTree = Java.type("com.sun.source.tree.MemberSelectTree");
1.51 +var MethodInvocationTree = Java.type("com.sun.source.tree.MethodInvocationTree");
1.52 +var StringArray = Java.type("java.lang.String[]");
1.53 +var ToolProvider = Java.type("javax.tools.ToolProvider");
1.54 +var Tree = Java.type("com.sun.source.tree.Tree");
1.55 +var Trees = Java.type("com.sun.source.util.Trees");
1.56 +var TreeScanner = Java.type("com.sun.source.util.TreeScanner");
1.57 +
1.58 +// resourceTrySuggestions
1.59 +
1.60 +function resourceTrySuggestions() {
1.61 + // get the system compiler tool
1.62 + var compiler = ToolProvider.systemJavaCompiler;
1.63 + // get standard file manager
1.64 + var fileMgr = compiler.getStandardFileManager(null, null, null);
1.65 + // Using Java.to convert script array (arguments) to a Java String[]
1.66 + var compUnits = fileMgr.getJavaFileObjects(
1.67 + Java.to(arguments, StringArray));
1.68 + // create a new compilation task
1.69 + var task = compiler.getTask(null, fileMgr, null, null, null, compUnits);
1.70 +
1.71 + // SourcePositions object to get positions of AST nodes
1.72 + var sourcePositions = Trees.instance(task).sourcePositions;
1.73 +
1.74 + // subclass SimpleTreeVisitor - to print resource try suggestions
1.75 + var ResourceTrySuggester = Java.extend(TreeScanner);
1.76 +
1.77 + function hasOnlyEmptyStats(stats) {
1.78 + var itr = stats.iterator();
1.79 + while (itr.hasNext()) {
1.80 + if (! (itr.next() instanceof EmptyStatementTree)) {
1.81 + return false;
1.82 + }
1.83 + }
1.84 +
1.85 + return true;
1.86 + }
1.87 +
1.88 + // does the given statement list has an expression statement which
1.89 + // calls "close" method (don't worry about types - just crude one will do)
1.90 + function hasCloseCall(stats) {
1.91 + var itr = stats.iterator();
1.92 + while (itr.hasNext()) {
1.93 + var stat = itr.next();
1.94 + if (stat instanceof ExpressionStatementTree) {
1.95 + var expr = stat.expression;
1.96 + if (expr instanceof MethodInvocationTree) {
1.97 + var method = expr.methodSelect;
1.98 + if (method instanceof MemberSelectTree) {
1.99 + return method.identifier.toString().equals("close");
1.100 + }
1.101 + }
1.102 + }
1.103 + }
1.104 + return false;
1.105 + }
1.106 +
1.107 + var visitor = new ResourceTrySuggester() {
1.108 + // current CompilationUnitTree
1.109 + compUnit: null,
1.110 + // current LineMap (pos -> line, column)
1.111 + lineMap: null,
1.112 + // current compilation unit's file name
1.113 + fileName: null,
1.114 +
1.115 + // overrides of TreeScanner methods
1.116 +
1.117 + visitCompilationUnit: function(node, p) {
1.118 + // capture info about current Compilation unit
1.119 + this.compUnit = node;
1.120 + this.lineMap = node.lineMap;
1.121 + this.fileName = node.sourceFile.name;
1.122 +
1.123 + // Using Java.super API to call super class method here
1.124 + return Java.super(visitor).visitCompilationUnit(node, p);
1.125 + },
1.126 +
1.127 + visitTry: function (node, p) {
1.128 + var finallyBlk = node.finallyBlock;
1.129 + if (finallyBlk != null && hasCloseCall(finallyBlk.statements)) {
1.130 + var pos = sourcePositions.getStartPosition(this.compUnit, node);
1.131 + var line = this.lineMap.getLineNumber(pos);
1.132 + var col = this.lineMap.getColumnNumber(pos);
1.133 + print("Consider resource try statement " + " @ " + this.fileName + ":" + line + ":" + col);
1.134 + // print(node);
1.135 + }
1.136 + }
1.137 + }
1.138 +
1.139 + for each (var cu in task.parse()) {
1.140 + cu.accept(visitor, null);
1.141 + }
1.142 +}
1.143 +
1.144 +// for each ".java" file in directory (recursively) and check it!
1.145 +function main(dir) {
1.146 + Files.walk(dir.toPath()).
1.147 + forEach(function(p) {
1.148 + var name = p.toFile().absolutePath;
1.149 + if (name.endsWith(".java")) {
1.150 + try {
1.151 + resourceTrySuggestions(p.toFile().getAbsolutePath());
1.152 + } catch (e) {
1.153 + print(e);
1.154 + }
1.155 + }
1.156 + });
1.157 +}
1.158 +
1.159 +main(new File(arguments[0]));
