lang/java/tools/src/main/java/org/apache/avro/tool/TrevniUtil.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.avro.tool;

import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;

import org.apache.trevni.Input;
import org.apache.trevni.avro.HadoopInput;
import org.apache.trevni.InputFile;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

/** Static utility methods for tools. */
class TrevniUtil {

  static Input input(String filename) throws IOException {
    if (filename.startsWith("hdfs://")) {
      return new HadoopInput(new Path(filename), new Configuration());
    } else {
      return new InputFile(new File(filename));
    }
  }

  /**
   * Returns stdin if filename is "-", else opens the local or HDFS file
   * and returns an InputStream for it.
   * @throws IOException
   */
  static InputStream input(String filename, InputStream stdin)
    throws IOException {
    if (filename.equals("-"))
      return new BufferedInputStream(stdin);
    else if (filename.startsWith("hdfs://")) {
      FileSystem fs = FileSystem.get(URI.create(filename), new Configuration());
      return new BufferedInputStream(fs.open(new Path(filename)));
    } else {
      return new BufferedInputStream(new FileInputStream(new File(filename)));
    }
  }

  /**
   * Returns stdout if filename is "-", else opens the local or HDFS file
   * and returns an OutputStream for it.
   * @throws IOException
   */
  static OutputStream output(String filename, OutputStream stdout)
    throws IOException {
    if (filename.equals("-"))
      return new BufferedOutputStream(stdout);
    else if (filename.startsWith("hdfs://")) {
      FileSystem fs = FileSystem.get(URI.create(filename), new Configuration());
      return new BufferedOutputStream(fs.create(new Path(filename)));
    } else {
      return new BufferedOutputStream(new FileOutputStream(new File(filename)));
    }
  }

}