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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.openqa.selenium.firefox.internal;

import org.openqa.selenium.io.CircularOutputStream;

import java.io.OutputStream;

public class Streams {

  /**
   * Drains the contents of a stream without blocking on further input from that stream.
   *
   * @param stream the stream to drain
   * @return the contents of the drained stream
   */
  public static String drainStream(OutputStream stream) {
    if (stream == null) {
      return null;
    }

    if (stream instanceof CircularOutputStream) {
      return stream.toString();
    }

    return null;
  }
}