/*
    * 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.maven.surefire.extensions.util;
  
  import javax.annotation.Nonnull;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.channels.Channel;
  import java.nio.channels.ClosedChannelException;
  import java.nio.channels.ReadableByteChannel;
  import java.nio.channels.WritableByteChannel;
  
  import static org.apache.maven.surefire.api.util.internal.Channels.newBufferedChannel;
  import static org.apache.maven.surefire.api.util.internal.Channels.newChannel;
  
  /**
   *
   */
  public final class CommandlineStreams implements Closeable {
      private final ReadableByteChannel stdOutChannel;
      private final ReadableByteChannel stdErrChannel;
      private final WritableByteChannel stdInChannel;
      private volatile boolean closed;
  
      public CommandlineStreams(@Nonnull Process process) {
          InputStream stdOutStream = process.getInputStream();
          stdOutChannel = newBufferedChannel(stdOutStream);
  
          InputStream stdErrStream = process.getErrorStream();
          stdErrChannel = newBufferedChannel(stdErrStream);
  
          stdInChannel = newChannel(process.getOutputStream());
      }
  
      public ReadableByteChannel getStdOutChannel() {
          return stdOutChannel;
      }
  
      public ReadableByteChannel getStdErrChannel() {
          return stdErrChannel;
      }
  
      public WritableByteChannel getStdInChannel() {
          return stdInChannel;
      }
  
      @Override
      public void close() throws IOException {
          if (closed) {
              return;
          }
  
          try (Channel c1 = stdOutChannel;
                  Channel c2 = stdErrChannel;
                  Channel c3 = stdInChannel) {
              closed = true;
          } catch (ClosedChannelException e) {
              // already closed externally
          }
      }
  }