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/*
 Copyright 2012-2013 University of Stavanger, Norway

 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 no.uis.nio.util;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Objects;

/**
 * Utility functions for file  providers.
 */
public class PathUtil {
  private PathUtil() {
  }
  
  public static void createDirectory(Path outDir, boolean cleanExisting) throws IOException {
    
    if (cleanExisting) {
      cleanDirectory(outDir);
    }
    Files.createDirectories(outDir);
  }
  
  public static void cleanDirectory(Path outDir) throws IOException {
    if (Files.isDirectory(outDir) && Files.exists(outDir)) {
      Files.walkFileTree(outDir, new SimpleFileVisitor() {

        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
          Files.delete(Objects.requireNonNull(file));
          return FileVisitResult.CONTINUE;
        }

      });
    }
  }
}