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Lucene example source code file (QueryParserWrapper.java)

This example Lucene source code file (QueryParserWrapper.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

deprecated, operator, or_operator, parseexception, parseexception, query, query, resolution, standardqueryparser, string, string, stringbuilder, text, unsupportedoperationexception, unsupportedoperationexception, util

The Lucene QueryParserWrapper.java source code

package org.apache.lucene.queryParser.standard;

/**
 * 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.text.Collator;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.DateTools;
import org.apache.lucene.document.DateTools.Resolution;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.queryParser.core.QueryNodeException;
import org.apache.lucene.queryParser.core.config.FieldConfig;
import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
import org.apache.lucene.queryParser.core.nodes.QueryNode;
import org.apache.lucene.queryParser.core.parser.SyntaxParser;
import org.apache.lucene.queryParser.core.processors.QueryNodeProcessor;
import org.apache.lucene.queryParser.standard.builders.StandardQueryBuilder;
import org.apache.lucene.queryParser.standard.builders.StandardQueryTreeBuilder;
import org.apache.lucene.queryParser.standard.config.AllowLeadingWildcardAttribute;
import org.apache.lucene.queryParser.standard.config.AnalyzerAttribute;
import org.apache.lucene.queryParser.standard.config.DateResolutionAttribute;
import org.apache.lucene.queryParser.standard.config.DefaultOperatorAttribute;
import org.apache.lucene.queryParser.standard.config.DefaultPhraseSlopAttribute;
import org.apache.lucene.queryParser.standard.config.LocaleAttribute;
import org.apache.lucene.queryParser.standard.config.LowercaseExpandedTermsAttribute;
import org.apache.lucene.queryParser.standard.config.MultiTermRewriteMethodAttribute;
import org.apache.lucene.queryParser.standard.config.PositionIncrementsAttribute;
import org.apache.lucene.queryParser.standard.config.RangeCollatorAttribute;
import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler;
import org.apache.lucene.queryParser.standard.parser.StandardSyntaxParser;
import org.apache.lucene.queryParser.standard.processors.StandardQueryNodeProcessorPipeline;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.MultiTermQuery;
import org.apache.lucene.search.Query;

/**
 * This class performs the query parsing using the new query parser
 * implementation, but keeps the old {@link QueryParser} API. <br/>
 * <br/>
 * This class should be used when the new query parser features are and the old
 * {@link QueryParser} API are needed at the same time. <br/>
 * 
 * @deprecated this class will be removed soon, it's a temporary class to be
 *             used along the transition from the old query parser to the new
 *             one
 */
@Deprecated
public class QueryParserWrapper {

  /**
   * The default operator for parsing queries. Use
   * {@link QueryParserWrapper#setDefaultOperator} to change it.
   */
  static public enum Operator { OR, AND }

  // the nested class:
  /** Alternative form of QueryParser.Operator.AND */
  public static final Operator AND_OPERATOR = Operator.AND;

  /** Alternative form of QueryParser.Operator.OR */
  public static final Operator OR_OPERATOR = Operator.OR;

  /**
   * Returns a String where those characters that QueryParser expects to be
   * escaped are escaped by a preceding <code>\.
   */
  public static String escape(String s) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < s.length(); i++) {
      char c = s.charAt(i);
      // These characters are part of the query syntax and must be escaped
      if (c == '\\' || c == '+' || c == '-' || c == '!' || c == '(' || c == ')'
          || c == ':' || c == '^' || c == '[' || c == ']' || c == '\"'
          || c == '{' || c == '}' || c == '~' || c == '*' || c == '?'
          || c == '|' || c == '&') {
        sb.append('\\');
      }
      sb.append(c);
    }
    return sb.toString();
  }

  private SyntaxParser syntaxParser = new StandardSyntaxParser();

  private StandardQueryConfigHandler config;

  private StandardQueryParser qpHelper;

  private QueryNodeProcessor processorPipeline;

  private StandardQueryBuilder builder = new StandardQueryTreeBuilder();

  private String defaultField;

  public QueryParserWrapper(String defaultField, Analyzer analyzer) {
    this.defaultField = defaultField;

    this.qpHelper = new StandardQueryParser();

    this.config = (StandardQueryConfigHandler) qpHelper.getQueryConfigHandler();

    this.qpHelper.setAnalyzer(analyzer);

    this.processorPipeline = new StandardQueryNodeProcessorPipeline(this.config);

  }

  StandardQueryParser getQueryParserHelper() {
    return qpHelper;
  }

  public String getField() {
    return this.defaultField;
  }

  public Analyzer getAnalyzer() {

    if (this.config != null
        && this.config.hasAttribute(AnalyzerAttribute.class)) {

      return this.config.getAttribute(AnalyzerAttribute.class).getAnalyzer();

    }

    return null;

  }

  /**
   * Sets the {@link StandardQueryBuilder} used to generate a {@link Query}
   * object from the parsed and processed query node tree.
   * 
   * @param builder the builder
   */
  public void setQueryBuilder(StandardQueryBuilder builder) {
    this.builder = builder;
  }

  /**
   * Sets the {@link QueryNodeProcessor} used to process the query node tree
   * generated by the
   * {@link org.apache.lucene.queryParser.standard.parser.StandardSyntaxParser}.
   * 
   * @param processor the processor
   */
  public void setQueryProcessor(QueryNodeProcessor processor) {
    this.processorPipeline = processor;
    this.processorPipeline.setQueryConfigHandler(this.config);

  }

  /**
   * Sets the {@link QueryConfigHandler} used by the {@link QueryNodeProcessor}
   * set to this object.
   * 
   * @param queryConfig the query config handler
   */
  public void setQueryConfig(StandardQueryConfigHandler queryConfig) {
    this.config = queryConfig;

    if (this.processorPipeline != null) {
      this.processorPipeline.setQueryConfigHandler(this.config);
    }

  }

  /**
   * Returns the query config handler used by this query parser
   * 
   * @return the query config handler
   */
  public QueryConfigHandler getQueryConfigHandler() {
    return this.config;
  }

  /**
   * Returns {@link QueryNodeProcessor} used to process the query node tree
   * generated by the
   * {@link org.apache.lucene.queryParser.standard.parser.StandardSyntaxParser}.
   * 
   * @return the query processor
   */
  public QueryNodeProcessor getQueryProcessor() {
    return this.processorPipeline;
  }

  public ParseException generateParseException() {
    return null;
  }

  public boolean getAllowLeadingWildcard() {

    if (this.config != null
        && this.config.hasAttribute(AllowLeadingWildcardAttribute.class)) {

      return this.config.getAttribute(AllowLeadingWildcardAttribute.class)
          .isAllowLeadingWildcard();

    }

    return false;

  }

  public MultiTermQuery.RewriteMethod getMultiTermRewriteMethod() {

    if (this.config != null
        && this.config.hasAttribute(MultiTermRewriteMethodAttribute.class)) {

      return this.config.getAttribute(MultiTermRewriteMethodAttribute.class)
          .getMultiTermRewriteMethod();

    }

    return MultiTermQuery.CONSTANT_SCORE_AUTO_REWRITE_DEFAULT;

  }

  public Resolution getDateResolution(String fieldName) {

    if (this.config != null) {
      FieldConfig fieldConfig = this.config.getFieldConfig(fieldName);

      if (fieldConfig != null) {

        if (this.config.hasAttribute(DateResolutionAttribute.class)) {

          return this.config.getAttribute(DateResolutionAttribute.class)
              .getDateResolution();

        }

      }

    }

    return null;

  }

  public boolean getEnablePositionIncrements() {

    if (this.config != null
        && this.config.hasAttribute(PositionIncrementsAttribute.class)) {

      return this.config.getAttribute(PositionIncrementsAttribute.class)
          .isPositionIncrementsEnabled();

    }

    return false;

  }

  public float getFuzzyMinSim() {
    return FuzzyQuery.defaultMinSimilarity;
  }

  public int getFuzzyPrefixLength() {
    return FuzzyQuery.defaultPrefixLength;
  }

  public Locale getLocale() {

    if (this.config != null && this.config.hasAttribute(LocaleAttribute.class)) {
      return this.config.getAttribute(LocaleAttribute.class).getLocale();
    }

    return Locale.getDefault();

  }

  public boolean getLowercaseExpandedTerms() {

    if (this.config != null
        && this.config.hasAttribute(LowercaseExpandedTermsAttribute.class)) {

      return this.config.getAttribute(LowercaseExpandedTermsAttribute.class)
          .isLowercaseExpandedTerms();

    }

    return true;

  }

  public int getPhraseSlop() {

    if (this.config != null
        && this.config.hasAttribute(AllowLeadingWildcardAttribute.class)) {

      return this.config.getAttribute(DefaultPhraseSlopAttribute.class)
          .getDefaultPhraseSlop();

    }

    return 0;

  }

  public Collator getRangeCollator() {

    if (this.config != null
        && this.config.hasAttribute(RangeCollatorAttribute.class)) {

      return this.config.getAttribute(RangeCollatorAttribute.class)
          .getRangeCollator();

    }

    return null;

  }

  public boolean getUseOldRangeQuery() {
    if (getMultiTermRewriteMethod() == MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE) {
      return true;
    } else {
      return false;
    }
  }

  public Query parse(String query) throws ParseException {

    try {
      QueryNode queryTree = this.syntaxParser.parse(query, getField());
      queryTree = this.processorPipeline.process(queryTree);
      return this.builder.build(queryTree);

    } catch (QueryNodeException e) {
      throw new ParseException("parse exception");
    }

  }

  public void setAllowLeadingWildcard(boolean allowLeadingWildcard) {
    this.qpHelper.setAllowLeadingWildcard(allowLeadingWildcard);
  }

  public void setMultiTermRewriteMethod(MultiTermQuery.RewriteMethod method) {
    this.qpHelper.setMultiTermRewriteMethod(method);
  }

  public void setDateResolution(Resolution dateResolution) {
    this.qpHelper.setDateResolution(dateResolution);
  }

  private Map<CharSequence, DateTools.Resolution> dateRes = new HashMap();

  public void setDateResolution(String fieldName, Resolution dateResolution) {
    dateRes.put(fieldName, dateResolution);
    this.qpHelper.setDateResolution(dateRes);
  }

  public void setDefaultOperator(Operator op) {

    this.qpHelper
        .setDefaultOperator(OR_OPERATOR.equals(op) ? org.apache.lucene.queryParser.standard.config.DefaultOperatorAttribute.Operator.OR
            : org.apache.lucene.queryParser.standard.config.DefaultOperatorAttribute.Operator.AND);

  }

  public Operator getDefaultOperator() {

    if (this.config != null
        && this.config.hasAttribute(DefaultOperatorAttribute.class)) {

      return (this.config.getAttribute(DefaultOperatorAttribute.class)
          .getOperator() == org.apache.lucene.queryParser.standard.config.DefaultOperatorAttribute.Operator.AND) ? AND_OPERATOR
          : OR_OPERATOR;

    }

    return OR_OPERATOR;

  }

  public void setEnablePositionIncrements(boolean enable) {
    this.qpHelper.setEnablePositionIncrements(enable);
  }

  public void setFuzzyMinSim(float fuzzyMinSim) {
    // TODO Auto-generated method stub

  }

  public void setFuzzyPrefixLength(int fuzzyPrefixLength) {
    // TODO Auto-generated method stub

  }

  public void setLocale(Locale locale) {
    this.qpHelper.setLocale(locale);
  }

  public void setLowercaseExpandedTerms(boolean lowercaseExpandedTerms) {
    this.qpHelper.setLowercaseExpandedTerms(lowercaseExpandedTerms);
  }

  public void setPhraseSlop(int phraseSlop) {
    this.qpHelper.setDefaultPhraseSlop(phraseSlop);
  }

  public void setRangeCollator(Collator rc) {
    this.qpHelper.setRangeCollator(rc);
  }

  public void setUseOldRangeQuery(boolean useOldRangeQuery) {
    if (useOldRangeQuery) {
      setMultiTermRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
    } else {
      setMultiTermRewriteMethod(MultiTermQuery.CONSTANT_SCORE_AUTO_REWRITE_DEFAULT);
    }
  }

  protected Query getPrefixQuery(String field, String termStr)
      throws ParseException {
    throw new UnsupportedOperationException();
  }

  protected Query getWildcardQuery(String field, String termStr)
      throws ParseException {
    throw new UnsupportedOperationException();
  }

  protected Query getFuzzyQuery(String field, String termStr,
      float minSimilarity) throws ParseException {
    throw new UnsupportedOperationException();
  }

  /** @deprecated Use {@link #getFieldQuery(String, String, boolean)} instead */
  @Deprecated
  protected Query getFieldQuery(String field, String queryText) throws ParseException {
    return getFieldQuery(field, queryText, true);
  }

  /**
   * @exception ParseException throw in overridden method to disallow
   */
  protected Query getFieldQuery(String field, String queryText, boolean quoted)
      throws ParseException {
    throw new UnsupportedOperationException();
  }

  protected Query getBooleanQuery(List<BooleanClause> clauses, boolean disableCoord)
      throws ParseException {
    throw new UnsupportedOperationException();
  }

  /**
   * Base implementation delegates to {@link #getFieldQuery(String,String)}.
   * This method may be overridden, for example, to return a SpanNearQuery
   * instead of a PhraseQuery.
   * 
   * @exception ParseException throw in overridden method to disallow
   */
  protected Query getFieldQuery(String field, String queryText, int slop)
      throws ParseException {
    throw new UnsupportedOperationException();
  }

  /**
   * @exception ParseException throw in overridden method to disallow
   */
  protected Query getRangeQuery(String field, String part1, String part2,
      boolean inclusive) throws ParseException {
    throw new UnsupportedOperationException();
  }

}

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