Quelle Hello.java Sprache: JAVA

/*
* Copyright (c) 2018, 2022, 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.awt.AWTError;
import java.awt.Desktop;
import java.awt.GraphicsEnvironment;
import java.awt.desktop.OpenFilesEvent;
import java.awt.desktop.OpenFilesHandler;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.file.Path;
import java.nio.file.Files;
import java.util.stream.Collectors;
import java.util.List;
import java.util.ArrayList;
import java.util.stream.Stream;
import java.util.Collections;
import java.util.Optional;

public class Hello implements OpenFilesHandler {

    public static void main(String[] args) throws IOException, InterruptedException {
        var faFiles = getFaFiles();
        if (faFiles != null) {
            // Some files got opened through fa mechanizm.
            // They are the arguments then.
            args = faFiles.toArray(String[]::new);
        }

        var lines = printArgs(args);

        Stream.of(args).forEach(arg -> System.out.println(
                arg.codePoints()
                        .mapToObj(codePoint -> String.format("0x%04x", codePoint))
                        .collect(Collectors.joining(",", "[", "]"))));

        lines.forEach(System.out::println);

        var outputFile = getOutputFile(args);
        trace(String.format("Output file: [%s]", outputFile));
        Files.write(outputFile, lines);

        if (Optional.ofNullable(System.getProperty("jpackage.test.noexit")).map(
                Boolean::parseBoolean).orElse(false)) {
            trace("noexit");
            var lock = new Object();
            synchronized (lock) {
                lock.wait();
            }
        }

        System.exit(Integer.getInteger("jpackage.test.exitCode", 0));
    }

    private static List<String> printArgs(String[] args) {
        List<String> lines = new ArrayList<>();
        lines.add(MSG);

        lines.add("args.length: " + args.length);

        for (String arg : args) {
            if (arg.startsWith("jpackage.app")) {
                lines.add(arg + "=" + System.getProperty(arg));
            } else {
                lines.add(arg);
            }
        }

        for (int index = 1; index <= EXPECTED_NUM_OF_PARAMS; index++) {
            String value = System.getProperty("param" + index);
            if (value != null) {
                lines.add("-Dparam" + index + "=" + value);
            }
        }

        return lines;
    }

    private static Path getOutputFile(String[] args) {
        Path outputFilePath = Path.of(Optional.ofNullable(System.getProperty(
                "jpackage.test.appOutput")).orElse("appOutput.txt"));

        // If first arg is a file (most likely from fa), then put output in the same folder as
        // the file from fa.
        if (args.length >= 1) {
            Path faPath = Path.of(args[0]);
            if (Files.exists(faPath)) {
                return faPath.toAbsolutePath().getParent().resolve(outputFilePath);
            }
        }

        try {
            // Try writing in the default output file.
            Files.write(outputFilePath, Collections.emptyList());
            return outputFilePath.toAbsolutePath();
        } catch (IOException ex) {
            // Log reason of a failure.
            StringWriter errors = new StringWriter();
            ex.printStackTrace(new PrintWriter(errors));
            Stream.of(errors.toString().split("\\R")).forEachOrdered(Hello::trace);
        }

        return Path.of(System.getProperty("user.home")).resolve(outputFilePath).toAbsolutePath();
    }

    @Override
    public void openFiles(OpenFilesEvent e) {
        synchronized(lock) {
            trace("openFiles");
            files = e.getFiles().stream()
                .map(File::toString)
                .collect(Collectors.toList());

            lock.notifyAll();
        }
    }

    private static List<String> getFaFiles() throws InterruptedException {
        if (openFilesHandler == null) {
            return null;
        }

        synchronized(openFilesHandler.lock) {
            trace("getFaFiles: wait");
            openFilesHandler.lock.wait(1000);
            if (openFilesHandler.files == null) {
                trace(String.format("getFaFiles: no files"));
                return null;
            }
            // Return copy of `files` to keep access to `files` field synchronized.
            trace(String.format("getFaFiles: file count %d",
                    openFilesHandler.files.size()));
            return new ArrayList<>(openFilesHandler.files);
        }
    }

    private List<String> files;
    private final Object lock = new Object();
    private final static Hello openFilesHandler = createInstance();

    private static Hello createInstance() {
        if (GraphicsEnvironment.isHeadless()) {
            return null;
        }

        trace("Environment supports a display");

        if (!Desktop.isDesktopSupported()) {
            return null;
        }

        trace("Environment supports a desktop");

        try {
            // Disable JAB.
            // Needed to suppress error:
            // Exception in thread "main" java.awt.AWTError: Assistive Technology not found: com.sun.java.accessibility.AccessBridge
            System.setProperty("javax.accessibility.assistive_technologies", "");
        } catch (SecurityException ex) {
            ex.printStackTrace();
        }

        try {
            var desktop = Desktop.getDesktop();
            if (desktop.isSupported(Desktop.Action.APP_OPEN_FILE)) {
                trace("Set file handler");
                Hello instance = new Hello();
                desktop.setOpenFileHandler(instance);
                return instance;
            }
        } catch (AWTError ex) {
            trace("Set file handler failed");
            ex.printStackTrace();
        }

        return null;
    }

    private static final String MSG = "jpackage test application";
    private static final int EXPECTED_NUM_OF_PARAMS = 3; // Starts at 1

    private static void trace(String msg) {
        System.out.println("hello: " + msg);
    }
}

quality96%

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.