content: package org.apache.lucene.analysis.payloads;
  /**
   * 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.
   */
  
  
  /**
   * Utility methods for encoding payloads.
   *
   **/
  public class PayloadHelper {
  
    public static byte[] encodeFloat(float payload) {
      return encodeFloat(payload, new byte[4], 0);
    }
  
    public static byte[] encodeFloat(float payload, byte[] data, int offset){
      return encodeInt(Float.floatToIntBits(payload), data, offset);
    }
  
    public static byte[] encodeInt(int payload){
      return encodeInt(payload, new byte[4], 0);
    }
  
    public static byte[] encodeInt(int payload, byte[] data, int offset){
      data[offset] = (byte)(payload >> 24);
      data[offset + 1] = (byte)(payload >> 16);
      data[offset + 2] = (byte)(payload >>  8);
      data[offset + 3] = (byte) payload;
      return data;
    }
  
    /**
     * @param bytes
     * @see #decodeFloat(byte[], int)
     * @see #encodeFloat(float)
     * @return the decoded float
     */
    public static float decodeFloat(byte [] bytes){
      return decodeFloat(bytes, 0);
    }
  
    /**
     * Decode the payload that was encoded using {@link #encodeFloat(float)}.
     * NOTE: the length of the array must be at least offset + 4 long.
     * @param bytes The bytes to decode
     * @param offset The offset into the array.
     * @return The float that was encoded
     *
     * @see #encodeFloat(float)
     */
    public static final float decodeFloat(byte [] bytes, int offset){
  
      return Float.intBitsToFloat(decodeInt(bytes, offset));
    }
  
    public static final int decodeInt(byte [] bytes, int offset){
      return ((bytes[offset] & 0xFF) << 24) | ((bytes[offset + 1] & 0xFF) << 16)
           | ((bytes[offset + 2] & 0xFF) <<  8) |  (bytes[offset + 3] & 0xFF);
    }
  }
  