Java example source code file (T6394683.java)

This example Java source code file (T6394683.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

assertionerror, bufferedwriter, cannot, file, fileoutputstream, ioexception, javacompiler, javatestfile, string, t6394683, testfile, xprefer\:newer, xprefer\:source

The T6394683.java Java example source code

/*
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * @test
 * @bug 6394683
 * @summary need to resolve different file-type precedence semantics for javac and 269
 */

import java.io.*;
import javax.tools.*;

public class T6394683 {
    static final String testSrc = System.getProperty("test.src", ".");
    static final File a_java = new File(testSrc, "A.java");
    static final File a_class = new File("A.class");
    static final File b_class = new File("B.class");
    static final File b_java = new File("B.java");

    static abstract class TestFile extends File {
        TestFile(File file) {
            super(file.getPath());
        }

        abstract void create() throws IOException;
    }

    static class JavaTestFile extends TestFile {
        JavaTestFile(File file, String text) {
            super(file);
            this.text = text;
        }

        void create() throws IOException {
            BufferedWriter out = new BufferedWriter(new FileWriter(this));
            out.write(text);
            out.newLine();
            out.close();
        }

        private String text;
    }

    static TestFile good_java = new JavaTestFile(b_java, "class B { }");
    static TestFile bad_java  = new JavaTestFile(b_java, "class B");

    static TestFile good_class = new TestFile(b_class) {
            void create() throws IOException {
                JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
                int rc = javac.run(null, null, null,
                                   "-d", ".",
                                   new File(testSrc, "B.java").getPath());
                if (rc != 0)
                    throw new AssertionError("compilation failed, rc=" + rc + " creating B.class");
            }
        };

    static TestFile bad_class = new TestFile(b_class) {
            void create() throws IOException {
                FileOutputStream out = new FileOutputStream(b_class);
                out.close();
            }
        };


    public static void main(String ... args) throws Exception {
        boolean ok;

        ok  = test("-Xprefer:source", good_java, bad_class);
        ok &= test("-Xprefer:source", bad_class, good_java);
        ok &= test("-Xprefer:newer",  bad_java,  good_class);
        ok &= test("-Xprefer:newer",  bad_class, good_java);

        if (!ok)
            throw new AssertionError("test failed");
    }

    static boolean test(String opt, TestFile older, TestFile newer) throws Exception {

        // ensure clean start
        a_class.delete();
        b_java.delete();
        b_class.delete();

        older.create();
        newer.create();
        if (!older.exists() || !newer.exists())
            throw new AssertionError("error creating files");

        int n = 0;
        while (newer.lastModified() <= older.lastModified()) {
            if (++n == 5)
                throw new Error("Cannot create files");
            Thread.sleep(1000);
            newer.create();
        }

        System.err.println("test:"
                           + "option:" + opt + ", "
                           + "older:" + older + "[" + older.length() + ":" + older.lastModified() + "], "
                           + "newer:" + newer + "[" + newer.length() + ":" + newer.lastModified() + "]");
        for (String s: new File(".").list())
            System.err.print(" " + s);
        System.err.println();

        JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
        int rc = javac.run(null, null, null,
                           "-d", ".",
                           "-classpath", ".",
                           "-sourcepath", ".",
                           opt,
                           a_java.getPath());
        if (rc != 0) {
            error("compilation failed, rc=" + rc + ", option: " + opt + ", older:" + older + ", newer" + newer);
            return false;
        }

        return true;
    }

    static void error(String msg) {
        System.err.println(msg);
    }
}