/*
 * 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.hadoop.fs.tosfs.object;

import org.apache.hadoop.fs.tosfs.object.exceptions.ChecksumMismatchException;
import org.apache.hadoop.fs.tosfs.util.CommonUtils;

import java.io.InputStream;
import java.util.Arrays;

public class ObjectContent {
  private final byte[] checksum;
  private final InputStream stream;

  public ObjectContent(byte[] checksum, InputStream stream) {
    this.checksum = checksum;
    this.stream = stream;
  }

  public InputStream stream() {
    return stream;
  }

  public InputStream verifiedStream(byte[] expectedChecksum) throws ChecksumMismatchException {
    if (!Arrays.equals(expectedChecksum, checksum)) {
      CommonUtils.runQuietly(stream::close);
      throw new ChecksumMismatchException(expectedChecksum, checksum);
    }

    return stream;
  }

  public byte[] checksum() {
    return checksum;
  }
}
