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Lucene example source code file (SearchWithSortTask.java)

This example Lucene source code file (SearchWithSortTask.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

illegalstateexception, no, override, override, readtask, runtimeexception, searchwithsorttask, sort, sort, sortfield, sortfield, string, string, you

The Lucene SearchWithSortTask.java source code

package org.apache.lucene.benchmark.byTask.tasks;
/**
 * 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 org.apache.lucene.benchmark.byTask.PerfRunData;
import org.apache.lucene.benchmark.byTask.feeds.QueryMaker;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;

/**
 * Does sort search on specified field.
 * 
 */
public class SearchWithSortTask extends ReadTask {

  private boolean doScore = true;
  private boolean doMaxScore = true;
  private Sort sort;

  public SearchWithSortTask(PerfRunData runData) {
    super(runData);
  }

  /**
   * SortFields: field:type,field:type[,noscore][,nomaxscore]
   *
   * If noscore is present, then we turn off score tracking
   * in {@link org.apache.lucene.search.TopFieldCollector}.
   * If nomaxscore is present, then we turn off maxScore tracking
   * in {@link org.apache.lucene.search.TopFieldCollector}.
   * 
   * name:string,page:int,subject:string
   * 
   */
  @Override
  public void setParams(String sortField) {
    super.setParams(sortField);
    String[] fields = sortField.split(",");
    SortField[] sortFields = new SortField[fields.length];
    int upto = 0;
    for (int i = 0; i < fields.length; i++) {
      String field = fields[i];
      SortField sortField0;
      if (field.equals("doc")) {
        sortField0 = SortField.FIELD_DOC;
      } else if (field.equals("score")) {
        sortField0 = SortField.FIELD_SCORE;
      } else if (field.equals("noscore")) {
        doScore = false;
        continue;
      } else if (field.equals("nomaxscore")) {
        doMaxScore = false;
        continue;
      } else {
        int index = field.lastIndexOf(":");
        String fieldName;
        String typeString;
        if (index != -1) {
          fieldName = field.substring(0, index);
          typeString = field.substring(1+index, field.length());
        } else {
          throw new RuntimeException("You must specify the sort type ie page:int,subject:string");
        }
        int type = getType(typeString);
        sortField0 = new SortField(fieldName, type);
      }
      sortFields[upto++] = sortField0;
    }

    if (upto < sortFields.length) {
      SortField[] newSortFields = new SortField[upto];
      System.arraycopy(sortFields, 0, newSortFields, 0, upto);
      sortFields = newSortFields;
    }
    this.sort = new Sort(sortFields);
  }

  private int getType(String typeString) {
    int type;
    if (typeString.equals("float")) {
      type = SortField.FLOAT;
    } else if (typeString.equals("double")) {
      type = SortField.DOUBLE;
    } else if (typeString.equals("byte")) {
      type = SortField.BYTE;
    } else if (typeString.equals("short")) {
      type = SortField.SHORT;
    } else if (typeString.equals("int")) {
      type = SortField.INT;
    } else if (typeString.equals("long")) {
      type = SortField.LONG;
    } else if (typeString.equals("string")) {
      type = SortField.STRING;
    } else if (typeString.equals("string_val")) {
      type = SortField.STRING_VAL;
    } else {
      throw new RuntimeException("Unrecognized sort field type " + typeString);
    }
    return type;
  }

  @Override
  public boolean supportsParams() {
    return true;
  }

  @Override
  public QueryMaker getQueryMaker() {
    return getRunData().getQueryMaker(this);
  }

  @Override
  public boolean withRetrieve() {
    return false;
  }

  @Override
  public boolean withSearch() {
    return true;
  }

  @Override
  public boolean withTraverse() {
    return false;
  }

  @Override
  public boolean withWarm() {
    return false;
  }

  @Override
  public boolean withScore() {
    return doScore;
  }

  @Override
  public boolean withMaxScore() {
    return doMaxScore;
  }
  
  @Override
  public Sort getSort() {
    if (sort == null) {
      throw new IllegalStateException("No sort field was set");
    }
    return sort;
  }

}

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