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A reactive Java web server.

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/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.v5.config.util;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.caucho.v5.vfs.ReadStream;
import com.caucho.v5.vfs.VfsOld;

/**
 * Static utility functions.
 */
public class ConfigUtil
{
  private static final Logger log = Logger.getLogger(ConfigUtil.class.getName());
  
  public static String getSourceLines(String systemId, int errorLine)
  {
    if (systemId == null)
      return "";

    try (ReadStream is = VfsOld.lookup().lookup(systemId).openRead()) {
      int line = 0;
      StringBuilder sb = new StringBuilder("\n\n");
      String text;
      while ((text = is.readLine()) != null) {
        line++;

        if (errorLine - 2 <= line && line <= errorLine + 2) {
          sb.append(line);
          sb.append(": ");
          sb.append(text);
          sb.append("\n");
        }
      }

      return sb.toString();
    } catch (IOException e) {
      log.log(Level.FINEST, e.toString(), e);

      return "";
    }
  }
}