code: /**
   * boilerpipe
   *
   * Copyright (c) 2009, 2014 Christian Kohlschütter
   *
   * The author licenses this file to You 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 com.kohlschutter.boilerpipe.filters.english;
  
  import java.util.Iterator;
  
  import com.kohlschutter.boilerpipe.BoilerpipeFilter;
  import com.kohlschutter.boilerpipe.BoilerpipeProcessingException;
  import com.kohlschutter.boilerpipe.document.TextBlock;
  import com.kohlschutter.boilerpipe.document.TextDocument;
  import com.kohlschutter.boilerpipe.labels.DefaultLabels;
  
  /**
   * Marks all blocks as "non-content" that occur after blocks that have been marked
   * {@link DefaultLabels#INDICATES_END_OF_TEXT}. These marks are ignored unless a minimum number of
   * words in content blocks occur before this mark (default: 60). This can be used in conjunction
   * with an upstream {@link TerminatingBlocksFinder}.
   * 
   * @see TerminatingBlocksFinder
   */
  public final class IgnoreBlocksAfterContentFilter extends HeuristicFilterBase implements
      BoilerpipeFilter {
    public static final IgnoreBlocksAfterContentFilter DEFAULT_INSTANCE =
        new IgnoreBlocksAfterContentFilter(60);
    public static final IgnoreBlocksAfterContentFilter INSTANCE_200 =
        new IgnoreBlocksAfterContentFilter(200);
    private final int minNumWords;
  
    /**
     * Returns the singleton instance for DeleteBlocksAfterContentFilter.
     */
    public static IgnoreBlocksAfterContentFilter getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }
  
    public IgnoreBlocksAfterContentFilter(final int minNumWords) {
      this.minNumWords = minNumWords;
    }
  
    public boolean process(TextDocument doc) throws BoilerpipeProcessingException {
      boolean changes = false;
  
      int numWords = 0;
      boolean foundEndOfText = false;
      for (Iterator<TextBlock> it = doc.getTextBlocks().iterator(); it.hasNext();) {
        TextBlock block = it.next();
  
        final boolean endOfText = block.hasLabel(DefaultLabels.INDICATES_END_OF_TEXT);
        if (block.isContent()) {
          numWords += getNumFullTextWords(block);
        }
        if (endOfText && numWords >= minNumWords) {
          foundEndOfText = true;
        }
        if (foundEndOfText) {
          changes = true;
          block.setIsContent(false);
        }
      }
  
      return changes;
    }
  }
  