/** * 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. */package org.apache.hadoop.contrib.dlucene.writable;import java.io.DataInput;import java.io.DataOutput;import java.io.IOException;import org.apache.hadoop.contrib.dlucene.Utils;import org.apache.hadoop.io.Text;import org.apache.hadoop.io.Writable;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.queryParser.ParseException;import org.apache.lucene.queryParser.QueryParser;import org.apache.lucene.search.Query;/** * A {@link Writable} wrapper for {@link Query}. */public class WQuery implements Writable {  /** The query object being wrapper. */  private Query query = null;  /**   * Constructor.   *    * @param query the query   */  public WQuery(Query query) {    this.query = query;  }  /**   * Constructor.   */  private WQuery() {    // do nothing  }  /**   * Get the Query object being wrapped.   *    * @return the Query object   */  public Query getQuery() {    return query;  }  /**   * Deserialize the Query object.   *    * @param in the input stream   * @return the Query object   * @throws IOException   */  public static WQuery read(DataInput in) throws IOException {    WQuery query = new WQuery();    query.readFields(in);    return query;  }  // ///////////////////////////////////////////////  // Writable  // ///////////////////////////////////////////////  /*   * (non-Javadoc)   *    * @see org.apache.hadoop.io.Writable#write(java.io.DataOutput)   */  public void write(DataOutput out) throws IOException {    Utils.checkArgs(out);    String s = query.toString(null);    Text.writeString(out, s);  }  /*   * (non-Javadoc)   *    * @see org.apache.hadoop.io.Writable#readFields(java.io.DataInput)   */  public void readFields(DataInput in) throws IOException {    Utils.checkArgs(in);    String q = Text.readString(in);    QueryParser queryParser = new QueryParser(null, new StandardAnalyzer());    try {      this.query = queryParser.parse(q);    } catch (ParseException p) {      throw new IOException(p.getMessage());    }  }}