// Copyright 2017 Google Inc.
//
// 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.google.crypto.tink;

import com.google.crypto.tink.proto.EncryptedKeyset;
import com.google.crypto.tink.proto.Keyset;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

A KeysetWriter that can write to some source cleartext or encrypted keysets in proto binary wire format.
Since:
1.0.0/**
 * A {@link KeysetWriter} that can write to some source cleartext or encrypted keysets in <a
 * href="https://developers.google.com/protocol-buffers/docs/encoding">proto binary wire format</a>.
 *
 * @since 1.0.0
 */
public final class BinaryKeysetWriter implements KeysetWriter {
  private final OutputStream outputStream;
  private final boolean closeStreamAfterReading;

  private BinaryKeysetWriter(OutputStream stream, boolean closeStreamAfterReading) {
    this.outputStream = stream;
    this.closeStreamAfterReading = closeStreamAfterReading;
  }

  
Static method to create a BinaryKeysetWriter that writes to an OutputStream. /** Static method to create a BinaryKeysetWriter that writes to an {@link OutputStream}. */
  public static KeysetWriter withOutputStream(OutputStream stream) {
    return new BinaryKeysetWriter(stream, /*closeStreamAfterReading=*/ false);
  }

  
Static method to create a BinaryKeysetWriter that writes to a file. /** Static method to create a BinaryKeysetWriter that writes to a file. */
  public static KeysetWriter withFile(File file) throws IOException {
    return new BinaryKeysetWriter(new FileOutputStream(file), /*closeStreamAfterReading=*/ true);
  }

  @Override
  public void write(Keyset keyset) throws IOException {
    try {
      keyset.writeTo(outputStream);
    } finally {
      if (closeStreamAfterReading) {
        outputStream.close();
      }
    }
  }

  @Override
  public void write(EncryptedKeyset keyset) throws IOException {
    try {
      keyset.writeTo(outputStream);
    } finally {
      if (closeStreamAfterReading) {
        outputStream.close();
      }
    }
  }
}