code: /* LanguageTool, a natural language style checker
   * Copyright (C) 2013 Daniel Naber (http://www.danielnaber.de)
   *
   * 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.chunking;
  
  /**
   * The name of a chunk. Just a string - this class exists mostly for better type safety.
   * @since 2.3
   */
  public class ChunkTag {
  
    private final String chunkTag;
    private final boolean isRegexp;
  
    public ChunkTag(String chunkTag) {
      this(chunkTag, false);
    }
  
    /** @since 5.1 */
    public ChunkTag(String chunkTag, boolean isRegexp) {
      if (chunkTag == null || chunkTag.trim().isEmpty()) {
        throw new IllegalArgumentException("chunkTag cannot be null or empty: '" + chunkTag + "'");
      }
      this.chunkTag = chunkTag;
      this.isRegexp = isRegexp;
    }
  
    public String getChunkTag() {
      return chunkTag;
    }
  
    /** @since 5.1 */
    public boolean isRegexp() {
      return isRegexp;
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;
      ChunkTag other = (ChunkTag) o;
      return chunkTag.equals(other.chunkTag);
    }
  
    @Override
    public int hashCode() {
      return chunkTag.hashCode();
    }
  
    @Override
    public String toString() {
      return chunkTag + (isRegexp ? "[regex]" : "");
    }
  }
  