    1   /* Copyright (C) 2003 Internet Archive.
    2    *
    3    * This file is part of the Heritrix web crawler (crawler.archive.org).
    4    *
    5    * Heritrix is free software; you can redistribute it and/or modify
    6    * it under the terms of the GNU Lesser Public License as published by
    7    * the Free Software Foundation; either version 2.1 of the License, or
    8    * any later version.
    9    *
    10   * Heritrix is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU Lesser Public License for more details.
    14   *
    15   * You should have received a copy of the GNU Lesser Public License
    16   * along with Heritrix; if not, write to the Free Software
    17   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18   *
    19   * MemUURISet.java
    20   * Created on Sep 15, 2003
    21   *
    22   * $Header$
    23   */
    24  package org.archive.crawler.util;
    25
    26
    27  /***
    28   * A UriUniqFilter that doesn't actually provide any uniqueness
    29   * filter on presented items: all are passed through.
    30   *
    31   * @author gojomo
    32   *
    33   */
    34  public class NoopUriUniqFilter
    35  extends SetBasedUriUniqFilter {
    36
    37      protected synchronized boolean setAdd(CharSequence uri) {
    38          return true; // always consider as new
    39      }
    40      protected synchronized boolean setRemove(CharSequence uri) {
    41          return true; // always consider as succeeded
    42      }
    43      protected synchronized long setCount() {
    44          return -1; // return nonsense value
    45      }
    46
    47      /* (non-Javadoc)
    48       * @see org.archive.crawler.util.UriUniqFilterImpl#createUriSet()
    49       */
    50      protected void createUriSet() {
    51          // do nothing
    52      }
    53
    54  }