com.badlogicgames.packr.PackrFileUtils Maven / Gradle / Ivy

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A single executable jar for use from the command line. Packages your JAR, assets and a JVM for distribution on Windows, Linux and macOS, adding a native executable file to make it appear like a native app.

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/*
 * Copyright 2020 See AUTHORS file
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.badlogicgames.packr;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;

/**
 * Some file utility wrappers to check for function results, and to raise exceptions in case of error.
 */
class PackrFileUtils {
   /**
    * Changes the file {@code path} to executable.
    *
    * @param path the path to the file to change to executable
    */
   static void chmodX(File path) {
      if (!path.setExecutable(true)) {
         System.err.println("Warning! Failed setting executable flag for: " + path);
      }
   }

   /**
    * Copies directories, preserving file attributes.
    * 
    * The {@link org.zeroturnaround.zip.commons.FileUtilsV2_2#copyDirectory(File, File)} function does not preserve file attributes.
    *
    * @param sourceDirectory the directory to copy from
    * @param targetDirectory the directory to copy into
    *
    * @throws IOException if an IO error occurs
    */
   static void copyDirectory(File sourceDirectory, File targetDirectory) throws IOException {
      final Path sourcePath = Paths.get(sourceDirectory.toURI()).toRealPath();
      final Path targetPath = Paths.get(targetDirectory.toURI());

      Files.walkFileTree(sourcePath, new SimpleFileVisitor() {
         @Override public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
            Path relative = sourcePath.relativize(dir);
            Path target = targetPath.resolve(relative);
            File folder = target.toFile();
            Files.createDirectories(folder.toPath());
            return FileVisitResult.CONTINUE;
         }

         @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            Path relative = sourcePath.relativize(file);
            Path target = targetPath.resolve(relative);
            Files.copy(file, target, StandardCopyOption.COPY_ATTRIBUTES);
            return FileVisitResult.CONTINUE;
         }
      });
   }

   /**
    * Deletes all the content of a directory and the directory itself.
    *
    * @param directory the directory to delete
    *
    * @throws IOException if an IO error occurs
    */
   static void deleteDirectory(File directory) throws IOException {
      Files.walkFileTree(directory.toPath(), new SimpleFileVisitor() {
         @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            Files.deleteIfExists(file);
            return super.visitFile(file, attrs);
         }

         @Override public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
            Files.deleteIfExists(dir);
            return super.postVisitDirectory(dir, exc);
         }
      });
   }
}