jdk-24/test/jdk/java/nio/file/spi/SetDefaultProvider.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @modules jdk.jartool
 * @library /test/lib
 * @build SetDefaultProvider TestProvider m/* jdk.test.lib.process.ProcessTools
 * @run testng/othervm SetDefaultProvider
 * @summary Runs tests with -Djava.nio.file.spi.DefaultFileSystemProvider set on
 *          the command line to override the default file system provider
 */

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.spi.ToolProvider;

import jdk.test.lib.process.ProcessTools;

import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import static org.testng.Assert.*;

@Test
public class SetDefaultProvider {

    private static String SET_DEFAULT_FSP =
        "-Djava.nio.file.spi.DefaultFileSystemProvider=TestProvider";

    private static final ToolProvider JAR_TOOL = ToolProvider.findFirst("jar")
        .orElseThrow(() ->
            new RuntimeException("jar tool not found")
        );

    private static Path createTempDirectory(String prefix) throws IOException {
        Path testDir = Paths.get(System.getProperty("test.dir", "."));
        return Files.createTempDirectory(testDir, prefix);
    }

    /**
     * Test override of default FileSystemProvider with the main application
     * on the class path.
     */
    public void testClassPath() throws Exception {
        String moduleClasses = moduleClasses();
        String testClasses = System.getProperty("test.classes");
        String classpath = moduleClasses + File.pathSeparator + testClasses;
        int exitValue = exec(SET_DEFAULT_FSP, "-cp", classpath, "p.Main");
        assertTrue(exitValue == 0);
    }

    /**
     * Test override of default FileSystemProvider with the main application
     * on the module path as an exploded module.
     */
    public void testExplodedModule() throws Exception {
        String modulePath = System.getProperty("jdk.module.path");
        int exitValue = exec(SET_DEFAULT_FSP, "-p", modulePath, "-m", "m/p.Main");
        assertTrue(exitValue == 0);
    }

    /**
     * Test override of default FileSystemProvider with the main application
     * on the module path as a modular JAR.
     */
    public void testModularJar() throws Exception {
        String jarFile = createModularJar();
        int exitValue = exec(SET_DEFAULT_FSP, "-p", jarFile, "-m", "m/p.Main");
        assertTrue(exitValue == 0);
    }

    /**
     * Test override of default FileSystemProvider where the main application
     * is a module that is patched by an exploded patch.
     */
    public void testExplodedModuleWithExplodedPatch() throws Exception {
        Path patchdir = createTempDirectory("patch");
        String modulePath = System.getProperty("jdk.module.path");
        int exitValue = exec(SET_DEFAULT_FSP,
                             "--patch-module", "m=" + patchdir,
                             "-p", modulePath,
                             "-m", "m/p.Main");
        assertTrue(exitValue == 0);
    }

    /**
     * Test override of default FileSystemProvider where the main application
     * is a module that is patched by an exploded patch.
     */
    public void testExplodedModuleWithJarPatch() throws Exception {
        Path patchdir = createTempDirectory("patch");
        Files.createDirectory(patchdir.resolve("m.properties"));
        Path patch = createJarFile(patchdir);
        String modulePath = System.getProperty("jdk.module.path");
        int exitValue = exec(SET_DEFAULT_FSP,
                             "--patch-module", "m=" + patch,
                             "-p", modulePath,
                             "-m", "m/p.Main");
        assertTrue(exitValue == 0);
    }

    /**
     * Returns the directory containing the classes for module "m".
     */
    private String moduleClasses() {
        String mp = System.getProperty("jdk.module.path");
        for (String dir : mp.split(File.pathSeparator)) {
            Path m = Paths.get(dir, "m");
            if (Files.exists(m)) return m.toString();
        }
        assertFalse(true);
        return null;
    }

    /**
     * Creates a modular JAR containing module "m".
     */
    private String createModularJar() throws Exception {
        Path dir = Paths.get(moduleClasses());
        Path jar = createJarFile(dir);
        return jar.toString();
    }

    /**
     * Creates a JAR file containing the entries in the given file tree.
     */
    private Path createJarFile(Path dir) throws Exception {
        Path jar = createTempDirectory("tmp").resolve("m.jar");
        String[] args = { "--create", "--file=" + jar, "-C", dir.toString(), "." };
        int ret = JAR_TOOL.run(System.out, System.out, args);
        assertTrue(ret == 0);
        return jar;
    }

    /**
     * Invokes the java launcher with the given arguments, returning the exit code.
     */
    private int exec(String... args) throws Exception {
       return ProcessTools.executeTestJava(args)
                .outputTo(System.out)
                .errorTo(System.out)
                .getExitValue();
    }
}