org.apache.lucene.analysis.payloads.PayloadHelper Maven / Gradle / Ivy
/*
* 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);
}
}