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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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/**
 * 
 */
package com.browseengine.bobo.search.section;

import java.io.IOException;

/**
 * UNARY-NOT operator node
 * (this node is not supported by SectionSearchQueryPlan)
 */
public class UnaryNotNode extends SectionSearchQueryPlan {
  private SectionSearchQueryPlan _subquery;

  public UnaryNotNode(SectionSearchQueryPlan subquery) {
    super();
    _subquery = subquery;
  }

  public SectionSearchQueryPlan getSubquery() {
    return _subquery;
  }

  @Override
  public int fetchDoc(int targetDoc) throws IOException {
    throw new UnsupportedOperationException("UnaryNotNode does not support fetchDoc");
  }

  @Override
  public int fetchSec(int targetSec) throws IOException {
    throw new UnsupportedOperationException("UnaryNotNode does not support fetchSec");
  }
}