| namespace Lucene.Net.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. |
| */ |
| |
| /// <summary> |
| /// Utility methods for encoding payloads. |
| /// </summary> |
| public class PayloadHelper |
| { |
| /// <summary> |
| /// NOTE: This was encodeFloat() in Lucene |
| /// </summary> |
| public static byte[] EncodeSingle(float payload) |
| { |
| return EncodeSingle(payload, new byte[4], 0); |
| } |
| |
| /// <summary> |
| /// NOTE: This was encodeFloat() in Lucene |
| /// </summary> |
| public static byte[] EncodeSingle(float payload, byte[] data, int offset) |
| { |
| return EncodeInt32(J2N.BitConversion.SingleToInt32Bits(payload), data, offset); |
| } |
| |
| /// <summary> |
| /// NOTE: This was encodeInt() in Lucene |
| /// </summary> |
| public static byte[] EncodeInt32(int payload) |
| { |
| return EncodeInt32(payload, new byte[4], 0); |
| } |
| |
| /// <summary> |
| /// NOTE: This was encodeInt() in Lucene |
| /// </summary> |
| public static byte[] EncodeInt32(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; |
| } |
| |
| /// <summary> |
| /// NOTE: This was decodeFloat() in Lucene |
| /// </summary> |
| /// <seealso cref="DecodeSingle(byte[], int)"/> |
| /// <seealso cref="EncodeSingle(float)"/> |
| /// <returns> the decoded float </returns> |
| public static float DecodeSingle(byte[] bytes) |
| { |
| return DecodeSingle(bytes, 0); |
| } |
| |
| /// <summary> |
| /// Decode the payload that was encoded using <see cref="EncodeSingle(float)"/>. |
| /// NOTE: the length of the array must be at least offset + 4 long. |
| /// <para/> |
| /// NOTE: This was decodeFloat() in Lucene |
| /// </summary> |
| /// <param name="bytes"> The bytes to decode </param> |
| /// <param name="offset"> The offset into the array. </param> |
| /// <returns> The float that was encoded |
| /// </returns> |
| /// <seealso cref="EncodeSingle(float)"/> |
| public static float DecodeSingle(byte[] bytes, int offset) |
| { |
| |
| return J2N.BitConversion.Int32BitsToSingle(DecodeInt32(bytes, offset)); |
| } |
| |
| /// <summary> |
| /// NOTE: This was decodeInt() in Lucene |
| /// </summary> |
| public static int DecodeInt32(byte[] bytes, int offset) |
| { |
| return ((bytes[offset] & 0xFF) << 24) | ((bytes[offset + 1] & 0xFF) << 16) | ((bytes[offset + 2] & 0xFF) << 8) | (bytes[offset + 3] & 0xFF); |
| } |
| } |
| } |