/*
    * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 2.1 of the License, or (at your option) any later version.
    *
    * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   *
   * Additionally licensed with:
   *
   * 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 org.spf4j.os;
  
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.nio.charset.Charset;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.annotation.Nullable;
  
  /**
   * @author Zoltan Farkas
   */
  @SuppressFBWarnings("LO_SUSPECT_LOG_PARAMETER")
  public final class LoggingProcessHandler implements ProcessHandler<Void, Void> {
  
    private Logger log;
  
    @SuppressFBWarnings("EI_EXPOSE_REP2")
    public LoggingProcessHandler(final Logger log) {
      this.log = log;
    }
  
    public void started(final Process p) {
      int pid = ProcessUtil.getPid(p);
      log.log(Level.FINE, "Started {0} with pid={1} ", new Object[]{p, pid});
      this.log = Logger.getLogger(log.getName() + '.' + pid);
    }
  
    @Override
    @Nullable
    public Void handleStdOut(final InputStream is) throws IOException {
      BufferedReader reader = new BufferedReader(new InputStreamReader(is, Charset.defaultCharset()));
      String line;
      while ((line = reader.readLine()) != null) {
        log.fine(line);
      }
      return null;
    }
  
    @Override
    @Nullable
    public Void handleStdErr(final InputStream stderr) throws IOException {
      BufferedReader reader = new BufferedReader(new InputStreamReader(stderr, Charset.defaultCharset()));
      String line;
      while ((line = reader.readLine()) != null) {
        log.severe(line);
      }
      return null;
    }
  
    @Override
    public String toString() {
      return "LoggingProcessHandler{" + "log=" + log + '}';
    }
  
  }