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Lucene example source code file (MultiTermRewriteMethodProcessor.java)

This example Lucene source code file (MultiTermRewriteMethodProcessor.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

illegalargumentexception, list, multitermrewritemethodattribute, multitermrewritemethodprocessor, multitermrewritemethodprocessor, override, override, parametricrangequerynode, queryconfighandler, queryconfighandler, querynode, querynode, querynodeprocessorimpl, util, wildcardquerynode

The Lucene MultiTermRewriteMethodProcessor.java source code

package org.apache.lucene.queryParser.standard.processors;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.
 */

import java.util.List;

import org.apache.lucene.queryParser.core.nodes.ParametricRangeQueryNode;
import org.apache.lucene.queryParser.core.nodes.QueryNode;
import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
import org.apache.lucene.queryParser.standard.config.MultiTermRewriteMethodAttribute;
import org.apache.lucene.queryParser.standard.nodes.WildcardQueryNode;
import org.apache.lucene.search.MultiTermQuery;

/**
 * This processor instates the default
 * {@link org.apache.lucene.search.MultiTermQuery.RewriteMethod},
 * {@link MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT}, for multi-term
 * query nodes.
 */
public class MultiTermRewriteMethodProcessor extends QueryNodeProcessorImpl {

  @Override
  protected QueryNode postProcessNode(QueryNode node) {

    // set setMultiTermRewriteMethod for WildcardQueryNode and
    // PrefixWildcardQueryNode
    if (node instanceof WildcardQueryNode
        || node instanceof ParametricRangeQueryNode) {

      if (!getQueryConfigHandler().hasAttribute(
          MultiTermRewriteMethodAttribute.class)) {
        // This should not happen, this attribute is created in the
        // StandardQueryConfigHandler
        throw new IllegalArgumentException(
            "MultiTermRewriteMethodAttribute should be set on the QueryConfigHandler");
      }

      // read the attribute value and use a TAG to take the value to the Builder
      MultiTermQuery.RewriteMethod rewriteMethod = getQueryConfigHandler()
          .getAttribute(MultiTermRewriteMethodAttribute.class)
          .getMultiTermRewriteMethod();

      node.setTag(MultiTermRewriteMethodAttribute.TAG_ID, rewriteMethod);

    }

    return node;
  }

  @Override
  protected QueryNode preProcessNode(QueryNode node) {
    return node;
  }

  @Override
  protected List<QueryNode> setChildrenOrder(List children) {
    return children;
  }
}

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