package org.apache.maven.surefire.report;

 /*

  * 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.

  */

 import org.apache.maven.surefire.util.TeeStream;

 import org.codehaus.plexus.util.IOUtil;

 import java.io.ByteArrayOutputStream;

 import java.io.PrintStream;

 /**

  * Captures System.out/System.err streams to buffers.

  * <p/>

  * Please note that this design is inherently single-threaded test-linear, and is intended only

  * for use with ReporterManager, which is also test-linear. While it will capture

  * output in a multi-threaded scenario, there's no way to associate ouput with the correct

  * test/thread.

  * <p/>

  * Note; this class does not need synchronization because all of these methods are serially invoked on

  * the same thread. Or maybe not. See notes inside ReporterManager about the general improperness

  * of this design in multithreading.

  */

 public class SystemStreamCapturer

 {

     private final PrintStream oldOut;

     private final PrintStream oldErr;

     private final PrintStream newErr;

     private final PrintStream newOut;

     private final ByteArrayOutputStream stdOut;

     private final ByteArrayOutputStream stdErr;

     public SystemStreamCapturer()

     {

         stdOut = new ByteArrayOutputStream();

         newOut = new PrintStream( stdOut );

         oldOut = System.out;

         TeeStream tee = new TeeStream( oldOut, newOut );

         System.setOut( tee );

         stdErr = new ByteArrayOutputStream();

         newErr = new PrintStream( stdErr );

         oldErr = System.err;

         tee = new TeeStream( oldErr, newErr );

         System.setErr( tee );

     }

     public void restoreStreams()

     {

         // Note that the fields can be null if the test hasn't even started yet (an early error)

         if ( oldOut != null )

         {

             System.setOut( oldOut );

         }

         if ( oldErr != null )

         {

             System.setErr( oldErr );

         }

         IOUtil.close( newOut );

         IOUtil.close( newErr );

     }

     public void clearCapturedContent()

     {

         if ( stdOut != null )

         {

             stdOut.reset();

         }

         if ( stdErr != null )

         {

             stdErr.reset();

         }

     }

     public String getStdOutLog()

     {

         // Note that the fields can be null if the test hasn't even started yet (an early error)

         return stdOut != null ? stdOut.toString() : "";

     }

     public String getStdErrLog()

     {

         // Note that the fields can be null if the test hasn't even started yet (an early error)

         return stdErr != null ? stdErr.toString() : "";

     }

 }