| /* |
| * 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.lucene.analysis.payloads; |
| |
| /** 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; |
| } |
| |
| /** |
| * @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); |
| } |
| } |