/** * 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.Writable;import org.apache.lucene.search.SortField;/** * A {@link Writable} wrapper for {@link SortField}. */public class WSortField implements Writable {  /** The SortField object being wrapped. */  private SortField sf = null;  /**   * Constructor.   *    * @param sortField the SortField object   */  public WSortField(SortField sortField) {    this.sf = sortField;  }  /**   * Constructor.   */  private WSortField() {    sf = new SortField(null, SortField.SCORE);  }  /**   * Get the SortField object being wrapped.   *    * @return the Sortfield object   */  public SortField getSortField() {    return sf;  }  /**   * Deserialize the SortField object.    *    * @param in the input stream   * @return the SortField object   * @throws IOException   */  public static WSortField read(DataInput in) throws IOException {    WSortField sf = new WSortField();    sf.readFields(in);    return sf;  }  // ///////////////////////////////////////////////  // Writable  // ///////////////////////////////////////////////  /*   * (non-Javadoc)   *    * @see org.apache.hadoop.io.Writable#write(java.io.DataOutput)   */  public void write(DataOutput out) throws IOException {    Utils.checkArgs(out);    String field = sf.getField();    SafeText.writeString(out, field);    out.writeBoolean(sf.getReverse());    out.writeInt(sf.getType());  }  /*   * (non-Javadoc)   *    * @see org.apache.hadoop.io.Writable#readFields(java.io.DataInput)   */  public void readFields(DataInput in) throws IOException {    Utils.checkArgs(in);    String field = SafeText.readString(in);    boolean reverse = in.readBoolean();    int type = in.readInt();    sf = new SortField(field, type, reverse);  }}