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Lucene example source code file (SpanFilter.java)

This example Lucene source code file (SpanFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

filter, filter, io, ioexception, ioexception, spanfilter, spanfilter, spanfilterresult, spanfilterresult

The Lucene SpanFilter.java source code

package org.apache.lucene.search;
/**
 * Copyright 2007 The Apache Software Foundation
 *
 * Licensed 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.
 */

import org.apache.lucene.index.IndexReader;

import java.io.IOException;

/** Abstract base class providing a mechanism to restrict searches to a subset
 of an index and also maintains and returns position information.

 This is useful if you want to compare the positions from a SpanQuery with the positions of items in
 a filter.  For instance, if you had a SpanFilter that marked all the occurrences of the word "foo" in documents,
 and then you entered a new SpanQuery containing bar, you could not only filter by the word foo, but you could
 then compare position information for post processing.
 */
public abstract class SpanFilter extends Filter{
  /** Returns a SpanFilterResult with true for documents which should be permitted in
    search results, and false for those that should not and Spans for where the true docs match.
   * @param reader The {@link org.apache.lucene.index.IndexReader} to load position and DocIdSet information from
   * @return A {@link SpanFilterResult}
   * @throws java.io.IOException if there was an issue accessing the necessary information
   * */
  public abstract SpanFilterResult bitSpans(IndexReader reader) throws IOException;
}

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