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/*
 * jupiter-interface
 *
 * Copyright (c) 2017, Michael Aichler.
 * All rights reserved.
 *
 * 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.github.sbt.junit.jupiter.api;

import java.io.PrintStream;
import java.util.Objects;

/**
 * Standard output and error stream pair.
 *
 * @author Michael Aichler
 */
public class StreamPair {

  /** Defines available stream types. */
  public enum Type {
    ERR,
    OUT
  }

  private final PrintStream out;
  private final PrintStream err;

  /**
   * Creates a stream pair from the given output and error print stream.
   *
   * @param out The standard output print stream.
   * @param err the error output print stream.
   */
  public StreamPair(final PrintStream out, final PrintStream err) {

    this.out = Objects.requireNonNull(out, "Output stream must not be null.");
    this.err = Objects.requireNonNull(err, "Error stream must not be null.");
  }

  /**
   * @param type The requested type.
   * @return The print stream of the specified {@code type}.
   */
  public PrintStream get(final Type type) {

    Objects.requireNonNull(type, "Stream type must not be null.");
    return Type.OUT.equals(type) ? out : err;
  }
}