/*****************************************************************
* 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.cayenne.crypto.transformer.value;
/**
* Converts between long and byte[] using big-endian encoding.
*
* @since 4.0
*/
public class LongConverter implements BytesConverter<Long> {
public static final BytesConverter INSTANCE = new LongConverter();
private static final int BYTES = 8;
static long getLong(byte[] bytes) {
if (bytes.length < BYTES) {
return IntegerConverter.getInt(bytes);
}
if (bytes.length > BYTES) {
throw new IllegalArgumentException("byte[] is too large for a single long value: " + bytes.length);
}
return (bytes[0] & 0xFFL) << 56
| (bytes[1] & 0xFFL) << 48
| (bytes[2] & 0xFFL) << 40
| (bytes[3] & 0xFFL) << 32
| (bytes[4] & 0xFFL) << 24
| (bytes[5] & 0xFFL) << 16
| (bytes[6] & 0xFFL) << 8
| (bytes[7] & 0xFFL);
}
static byte[] getBytes(long k) {
if (k >= Integer.MIN_VALUE && k <= Integer.MAX_VALUE) {
return IntegerConverter.getBytes((int) k);
}
return new byte[]{
(byte) (k >> 56),
(byte) (k >> 48),
(byte) (k >> 40),
(byte) (k >> 32),
(byte) (k >> 24),
(byte) (k >> 16),
(byte) (k >> 8),
(byte) k};
}
@Override
public Long fromBytes(byte[] bytes) {
return getLong(bytes);
}
@Override
public byte[] toBytes(Long value) {
return getBytes(value);
}
}