Java example source code file (T6877206.java)

This example Java source code file (T6877206.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

context, exception, file, filewriter, ioexception, jar, jaroutputstream, jarurlconnection, javacfilemanager, net, network, set, string, symbolfileobject, t6877206, treeset, uri, util, zip

The T6877206.java Java example source code

/*
 * Copyright (c) 2009, 2011, 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 6877206
 * @summary JavaFileObject.toUri returns bogus URI (win)
 */

import java.io.*;
import java.net.*;
import java.util.*;
import java.util.jar.*;
import java.util.zip.*;
import javax.tools.*;

import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Options;

// Test URIs returned from JavacFileManager and its support classes.
// For a variety of file objects, verify the validity of FileObject.toUri()
// by verifying the URI exists and points to the same contents as the file
// object itself

public class T6877206 {
    public static void main(String... args) throws Exception {
        new T6877206().run();
    }

    Set<String> foundClasses = new TreeSet();
    Set<String> foundJars = new TreeSet();

    void run() throws Exception {
        File rt_jar = findRtJar();

        // names for entries to be created in directories and jar files
        String[] entries = { "p/A.class", "p/resources/A-1.jpg" };

        // test various combinations of directories and jar files, intended to
        // cover all sources of URIs within JavacFileManager's support classes

        test(createFileManager(), createDir("dir", entries), "p", entries.length);
        test(createFileManager(), createDir("a b/dir", entries), "p", entries.length);

        for (boolean useOptimizedZip: new boolean[] { false, true }) {
            test(createFileManager(useOptimizedZip), createJar("jar", entries), "p", entries.length);
            test(createFileManager(useOptimizedZip), createJar("jar jar", entries), "p", entries.length);

            for (boolean useSymbolFile: new boolean[] { false, true }) {
                test(createFileManager(useOptimizedZip, useSymbolFile), rt_jar, "java.lang.ref", -1);
            }
        }

        // Verify that we hit all the impl classes we intended
        checkCoverage("classes", foundClasses,
                "RegularFileObject", "SymbolFileObject", "ZipFileIndexFileObject", "ZipFileObject");

        // Verify that we hit the jar files we intended, specifically ct.sym as well as rt.jar
        checkCoverage("jar files", foundJars,
                "ct.sym", "jar", "jar jar", "rt.jar");
    }

    // use a new file manager for each test
    void test(StandardJavaFileManager fm, File f, String pkg, int expect) throws Exception {
        JarURLConnection c;
        System.err.println("Test " + f);
        try {
            fm.setLocation(StandardLocation.CLASS_PATH, Collections.singleton(f));

            int count = 0;
            for (JavaFileObject fo: fm.list(StandardLocation.CLASS_PATH,
                    pkg, EnumSet.allOf(JavaFileObject.Kind.class), true)) {
                System.err.println("checking " + fo);
                // record the file object class name for coverage checks later
                foundClasses.add(fo.getClass().getSimpleName());
                testFileObject(fo);
                count++;
            }

            if (expect > 0 && count != expect)
                throw new Exception("wrong number of entries found: "
                        + count + ", expected " + expect);
        } finally {
            fm.close();
        }
    }

    void testFileObject(JavaFileObject fo) throws Exception {
        // test the validity of the result of toUri() by using URLConnection
        // and comparing the results of reading from the connection with the
        // result of reading from the file object directly.
        URI uri = fo.toUri();
        System.err.println("uri: " + uri);

        URLConnection urlconn = uri.toURL().openConnection();
        if (urlconn instanceof JarURLConnection) {
            JarURLConnection jarconn = (JarURLConnection) urlconn;
            File f = new File(jarconn.getJarFile().getName());
            // record access to the jar file for coverage checks later
            foundJars.add(f.getName());
        }

        try {
            byte[] uriData = read(urlconn.getInputStream());
            byte[] foData = read(fo.openInputStream());
            if (!Arrays.equals(uriData, foData)) {
                if (uriData.length != foData.length)
                    throw new Exception("data size differs: uri data "
                            + uriData.length + " bytes, fo data " + foData.length+ " bytes");
                for (int i = 0; i < uriData.length; i++) {
                    if (uriData[i] != foData[i])
                    throw new Exception("unexpected data returned at offset " + i
                            + ", uri data " + uriData[i] + ", fo data " + foData[i]);
                }
                throw new AssertionError("cannot find difference");
            }
        } finally {
            // In principle, simply closing the result of urlconn.getInputStream()
            // should have been sufficient. But the internal JarURLConnection
            // does not close the JarFile in an expeditious manner, thus preventing
            // jtreg from deleting the jar file before starting the next test.
            // Therefore we force access to the JarURLConnection to close the
            // JarFile when necessary.
            if (urlconn instanceof JarURLConnection) {
                JarURLConnection jarconn = (JarURLConnection) urlconn;
                jarconn.getJarFile().close();
            }
        }
    }

    void checkCoverage(String label, Set<String> found, String... expect) throws Exception {
        Set<String> e = new TreeSet(Arrays.asList(expect));
        if (!found.equals(e)) {
            e.removeAll(found);
            throw new Exception("expected " + label + " not used: " + e);
        }
    }

    JavacFileManager createFileManager() {
        return createFileManager(false, false);
    }

    JavacFileManager createFileManager(boolean useOptimizedZip) {
        return createFileManager(useOptimizedZip, false);
    }

    JavacFileManager createFileManager(boolean useOptimizedZip, boolean useSymbolFile) {
        Context ctx = new Context();
        Options options = Options.instance(ctx);
        options.put("useOptimizedZip", Boolean.toString(useOptimizedZip));
        if (!useSymbolFile) {
            options.put("ignore.symbol.file", "true");
        }
        return new JavacFileManager(ctx, false, null);
    }

    File createDir(String name, String... entries) throws Exception {
        File dir = new File(name);
        if (!dir.mkdirs())
            throw new Exception("cannot create directories " + dir);
        for (String e: entries) {
            writeFile(new File(dir, e), e);
        }
        return dir;
    }

    File createJar(String name, String... entries) throws IOException {
        File jar = new File(name);
        OutputStream out = new FileOutputStream(jar);
        try {
            JarOutputStream jos = new JarOutputStream(out);
            for (String e: entries) {
                jos.putNextEntry(new ZipEntry(e));
                jos.write(e.getBytes());
            }
            jos.close();
        } finally {
            out.close();
        }
        return jar;
    }

    File findRtJar() throws Exception {
        File java_home = new File(System.getProperty("java.home"));
        if (java_home.getName().equals("jre"))
            java_home = java_home.getParentFile();
        File rt_jar = new File(new File(new File(java_home, "jre"), "lib"), "rt.jar");
        if (!rt_jar.exists())
            throw new Exception("can't find rt.jar");
        return rt_jar;
    }

    byte[] read(InputStream in) throws IOException {
        byte[] data = new byte[1024];
        int offset = 0;
        try {
            int n;
            while ((n = in.read(data, offset, data.length - offset)) != -1) {
                offset += n;
                if (offset == data.length)
                    data = Arrays.copyOf(data, 2 * data.length);
            }
        } finally {
            in.close();
        }
        return Arrays.copyOf(data, offset);
    }

    void writeFile(File f, String s) throws IOException {
        f.getParentFile().mkdirs();
        FileWriter out = new FileWriter(f);
        try {
            out.write(s);
        } finally {
            out.close();
        }
    }
}