sql/src/test/java/org/apache/druid/sql/calcite/TempDirProducer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.druid.sql.calcite;

import org.apache.druid.java.util.common.FileUtils;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;

/**
 * Creates a hierarchy of temp dirs.
 *
 * All created directories will be accessible until the shutdown of the current JVM.
 * Installs only a single shutdown hook.
 */
public class TempDirProducer implements Closeable
{
  private final File tempDir;

  public TempDirProducer(String prefix)
  {
    tempDir = FileUtils.createTempDir(prefix);
  }

  public TempDirProducer(TempDirProducer tempDirProducer, String prefix)
  {
    this.tempDir = FileUtils.createTempDirInLocation(tempDirProducer.tempDir.toPath(), prefix);
  }

  public TempDirProducer getProducer(String prefix)
  {
    return new TempDirProducer(this, prefix);
  }

  public File newTempFolder(String prefix)
  {
    return FileUtils.createTempDirInLocation(tempDir.toPath(), prefix);
  }

  public File newTempFolder()
  {
    return newTempFolder(null);
  }

  @Override
  public void close() throws IOException
  {
    FileUtils.deleteDirectory(tempDir);
  }
}