/*
    * (C) Copyright 2006-2014 Nuxeo SA (http://nuxeo.com/) and contributors.
    *
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the GNU Lesser General Public License
    * (LGPL) version 2.1 which accompanies this distribution, and is available at
    * http://www.gnu.org/licenses/lgpl-2.1.html
    *
    * 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
   * Lesser General Public License for more details.
   *
   * Contributors:
   *     Nuxeo - initial API and implementation
   *
   */
  
  package org.nuxeo.build.ant;
  
  import java.io.BufferedReader;
  import java.io.FileReader;
  import java.io.IOException;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.Task;
  
  /**
   * TODO NXBT-258
   */
  public class PropertyRegexp extends Task {
  
      String property;
  
      String pattern;
  
      String input;
  
      int select = 0;
  
      public void setProperty(String property) {
          this.property = property;
      }
  
      public void setPattern(String pattern) {
          this.pattern = pattern;
      }
  
      /**
       * @param input file path
       */
      public void setInput(String input) {
          this.input = input;
      }
  
      public void setSelect(int select) {
          this.select = select;
      }
  
      @Override
      public void execute() {
          try {
              String inputString = readFileAsString(input);
              Pattern p = Pattern.compile(pattern);
              Matcher m = p.matcher(inputString);
              String findString = "";
              if (m.find()) {
                  findString = m.group(select);
              }
              getProject().setProperty(property, findString);
          } catch (IOException e) {
              AntClient.getInstance().log("Couldn't read " + input, e,
                      Project.MSG_ERR);
          }
      }
  
      private static String readFileAsString(String filePath) throws IOException {
          StringBuffer fileData = new StringBuffer(1000);
          BufferedReader reader = new BufferedReader(new FileReader(filePath));
          char[] buf = new char[1024];
          int numRead = 0;
          while ((numRead = reader.read(buf)) != -1) {
              fileData.append(buf, 0, numRead);
          }
          reader.close();
          return fileData.toString();
      }
  
  }