Java example source code file (TestExceptions.java)

This example Java source code file (TestExceptions.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

bytearrayoutputstream, error, exception, file, initialization, ioexception, jar, jarfile, jaroutputstream, list, packtestinput, packtestjarinputstream, testinput, unpacktestfileinput, unpacktestinput, util

The TestExceptions.java Java example source code

/*
 * Copyright (c) 2010, 2013, 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.
 */

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.jar.Pack200;

/*
 * @test
 * @bug 6985763
 * @summary verify that proper exceptions are thrown
 * @compile -XDignore.symbol.file Utils.java TestExceptions.java
 * @run main TestExceptions
 * @author ksrini
 */

public class TestExceptions {

    static final File testJar = new File("test.jar");
    static final File testPackFile = new File("test.pack");

    static void init() {
        Utils.jar("cvf", testJar.getAbsolutePath(), ".");
        JarFile jf = null;
        try {
            jf = new JarFile(testJar);
            Utils.pack(jf, testPackFile);
        } catch (IOException ioe) {
            throw new Error("Initialization error", ioe);
        } finally {
            Utils.close(jf);
        }
    }

    // a test that closes the input jarFile.
    static void pack200Test1() {
        PackTestInput ti = null;
        // setup the scenario
        try {
            ti = new PackTestInput(new JarFile(testJar), new ByteArrayOutputStream());
        } catch (Exception e) {
            throw new Error("Initialization error", e);
        } finally {
            Utils.close(ti.getJarFile());
        }
        // test the scenario
        try {
            System.out.println(ti);
            Pack200.Packer p = Pack200.newPacker();
            p.pack(ti.getJarFile(), ti.getOutputStream());
        } catch (Exception e) {
            ti.checkException(e);
        } finally {
            if (ti != null) {
                ti.close();
            }
        }
    }

    // test the Pack200.pack(JarFile, OutputStream);
    static void pack200Test2() {
        List<PackTestInput> tlist = new ArrayList();
        try {
            // setup the test scenarios
            try {
                tlist.add(new PackTestInput((JarFile)null, null));
                tlist.add(new PackTestInput(new JarFile(testJar), null));
                tlist.add(new PackTestInput((JarFile)null, new ByteArrayOutputStream()));
            } catch (Exception e) {
                throw new Error("Initialization error", e);
            }

            // test the scenarios
            for (PackTestInput ti : tlist) {
                System.out.println(ti);
                try {
                    Pack200.Packer p = Pack200.newPacker();
                    p.pack(ti.getJarFile(), ti.getOutputStream());
                } catch (Exception e) {
                    ti.checkException(e);
                }
            }
        } finally { // keep jprt happy
            for (TestInput ti : tlist) {
                if (ti != null) {
                    ti.close();
                }
            }
        }
    }

    // test the Pack200.pack(JarInputStream, OutputStream);
    static void pack200Test3() {
        List<PackTestJarInputStream> tlist = new ArrayList();
        try {
            // setup the test scenarios
            try {
                tlist.add(new PackTestJarInputStream((JarInputStream)null, null));
                tlist.add(new PackTestJarInputStream((JarInputStream)null,
                        new ByteArrayOutputStream()));
                tlist.add(new PackTestJarInputStream(
                        new JarInputStream(new FileInputStream(testJar)), null));

            } catch (Exception e) {
                throw new Error("Initialization error", e);
            }
            for (PackTestJarInputStream ti : tlist) {
                System.out.println(ti);
                try {
                    Pack200.Packer p = Pack200.newPacker();
                    p.pack(ti.getJarInputStream(), ti.getOutputStream());
                } catch (Exception e) {
                    ti.checkException(e);
                }
            }
        } finally { // keep jprt happy
            for (PackTestJarInputStream ti : tlist) {
                if (ti != null) {
                    ti.close();
                }
            }
        }
    }

    // test the Pack200.unpack(InputStream, OutputStream);
    static void unpack200Test1() {
        List<UnpackTestInput> tlist = new ArrayList();
        try {
            // setup the test scenarios
            try {
                tlist.add(new UnpackTestInput((InputStream)null, null));
                tlist.add(new UnpackTestInput(new FileInputStream(testPackFile),
                        null));
                tlist.add(new UnpackTestInput((InputStream) null,
                        new JarOutputStream(new ByteArrayOutputStream())));
            } catch (Exception e) {
                throw new Error("Initialization error", e);
            }

            // test the scenarios
            for (UnpackTestInput ti : tlist) {
                System.out.println(ti);
                try {
                    Pack200.Unpacker unpacker = Pack200.newUnpacker();
                    unpacker.unpack(ti.getInputStream(), ti.getJarOutputStream());
                } catch (Exception e) {
                    ti.checkException(e);
                }
            }
        } finally { // keep jprt happy
            for (TestInput ti : tlist) {
                if (ti != null) {
                    ti.close();
                }
            }
        }
    }

    // test the Pack200.unpack(File, OutputStream);
    static void unpack200Test2() {
        List<UnpackTestFileInput> tlist = new ArrayList();
        try {
            // setup the test scenarios
            try {
                tlist.add(new UnpackTestFileInput((File)null, null));
                tlist.add(new UnpackTestFileInput(testPackFile, null));
                tlist.add(new UnpackTestFileInput((File)null,
                        new JarOutputStream(new ByteArrayOutputStream())));
            } catch (Exception e) {
                throw new Error("Initialization error", e);
            }

            // test the scenarios
            for (UnpackTestFileInput ti : tlist) {
                System.out.println(ti);
                try {
                    Pack200.Unpacker unpacker = Pack200.newUnpacker();
                    unpacker.unpack(ti.getInputFile(), ti.getJarOutputStream());
                } catch (Exception e) {
                    ti.checkException(e);
                }
            }
        } finally { // keep jprt happy
            for (TestInput ti : tlist) {
                if (ti != null) {
                    ti.close();
                }
            }
        }
    }

    public static void main(String... args) throws IOException {
        init();
        pack200Test1();
        pack200Test2();
        pack200Test3();
        unpack200Test1();
        Utils.cleanup();
    }

    // containers for test inputs and management
    static abstract class TestInput {

        private final Object in;
        private final Object out;
        final boolean shouldNPE;
        final String testname;

        public TestInput(String name, Object in, Object out) {
            this.testname = name;
            this.in = in;
            this.out = out;
            shouldNPE = (in == null || out == null);
        }

        @Override
        public String toString() {
            StringBuilder outStr = new StringBuilder(testname);
            outStr.append(", input:").append(in);
            outStr.append(", output:").append(this.out);
            outStr.append(", should NPE:").append(shouldNPE);
            return outStr.toString();
        }

        void close() {
            if (in != null && (in instanceof Closeable)) {
                Utils.close((Closeable) in);
            }
            if (out != null && (out instanceof Closeable)) {
                Utils.close((Closeable) out);
            }
        }

        void checkException(Throwable t) {
            if (shouldNPE) {
                if (t instanceof NullPointerException) {
                    System.out.println("Got expected exception");
                    return;
                } else {
                    throw new RuntimeException("Expected NPE, but got ", t);
                }
            }
            if (t instanceof IOException) {
                System.out.println("Got expected exception");
                return;
            } else {
                throw new RuntimeException("Expected IOException but got ", t);
            }
        }
    }

    static class PackTestInput extends TestInput {

        public PackTestInput(JarFile jf, OutputStream out) {
            super("PackTestInput", jf, out);
        }

        JarFile getJarFile() {
            return (JarFile) super.in;
        }

        OutputStream getOutputStream() {
            return (OutputStream) super.out;
        }
    };

    static class PackTestJarInputStream extends TestInput {

        public PackTestJarInputStream(JarInputStream in, OutputStream out) {
            super("PackTestJarInputStream", in, out);
        }

        JarInputStream getJarInputStream() {
            return (JarInputStream) super.in;
        }

        OutputStream getOutputStream() {
            return (OutputStream) super.out;
        }
    };

    static class UnpackTestInput extends TestInput {

        public UnpackTestInput(InputStream in, JarOutputStream out) {
            super("UnpackTestInput", in, out);
        }

        InputStream getInputStream() {
            return (InputStream) super.in;
        }

        JarOutputStream getJarOutputStream() {
            return (JarOutputStream) super.out;
        }
    };

    static class UnpackTestFileInput extends TestInput {

        public UnpackTestFileInput(File in, JarOutputStream out) {
            super("UnpackTestInput", in, out);
        }

        File getInputFile() {
            return (File) super.in;
        }

        JarOutputStream getJarOutputStream() {
            return (JarOutputStream) super.out;
        }
    };
}