Java Path Create nio createJarFile(Path directory, String name, Optional manifest, Class[] classesToAdd, Map filesToAdd)

Description

create Jar File

License

Apache License

Declaration

private static Path createJarFile(Path directory, String name, Optional<Manifest> manifest,
            Class[] classesToAdd, Map<String, Path> filesToAdd) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.InputStream;
import java.io.OutputStream;

import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import java.util.Map;
import java.util.Optional;

import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

public class Main {
    private static final String CLASS_EXTENSION = ".class";
    private static final String FILE_SEPARATOR = FileSystems.getDefault().getSeparator();

    private static Path createJarFile(Path directory, String name, Optional<Manifest> manifest,
            Class[] classesToAdd, Map<String, Path> filesToAdd) throws Exception {
        Path outputFile = directory.resolve(name);
        OutputStream fileOutputStream = Files.newOutputStream(outputFile);
        try (JarOutputStream outputStream = manifest.isPresent()
                ? new JarOutputStream(fileOutputStream, manifest.get())
                : new JarOutputStream(fileOutputStream, new Manifest())) {
            for (Class currentClass : classesToAdd) {
                addClass(outputStream, currentClass);
            }/*from  w  w  w .j  av a  2s.  c o  m*/
            for (String entryName : filesToAdd.keySet()) {
                Path file = filesToAdd.get(entryName);
                addPath(outputStream, file, entryName);
            }
        }
        return outputFile;
    }

    private static void addClass(JarOutputStream outputStream, Class currentClass) throws Exception {
        String resourceName = classToResourceName(currentClass);
        Path classFile = classToPath(currentClass);
        addPath(outputStream, classFile, resourceName);
    }

    private static void addPath(JarOutputStream outputStream, Path path, String entryName) throws Exception {
        outputStream.putNextEntry(new JarEntry(entryName));
        if (!Files.isDirectory(path)) {
            try (InputStream inputStream = Files.newInputStream(path)) {
                while (inputStream.available() > 0) {
                    outputStream.write(inputStream.read());
                }
            }
        }
        outputStream.closeEntry();
    }

    public static String classToResourceName(Class currentClass) throws Exception {
        return currentClass.getCanonicalName().replace(".", FILE_SEPARATOR) + CLASS_EXTENSION;
    }

    public static Path classToPath(Class currentClass) throws Exception {
        return Paths.get(currentClass.getResource(FILE_SEPARATOR + classToResourceName(currentClass)).toURI());
    }
}

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