org.apache.thrift.utils.StringUtils Maven / Gradle / Ivy
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/*
* 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.thrift.utils;
public final class StringUtils {
private StringUtils() {
// Utility class.
}
private static final char[] HEX_CHARS = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
/**
* Stringify a byte array to the hex representation for each byte.
*
* @param bytes the byte array to convert to hex string.
* @return hex string.
*/
public static String bytesToHexString(byte[] bytes) {
if (bytes == null) {
return null;
}
return bytesToHexString(bytes, 0, bytes.length);
}
/**
* Stringify a portion of the byte array.
*
* @param bytes byte array.
* @param offset portion start.
* @param length portion length.
* @return hex string.
*/
public static String bytesToHexString(byte[] bytes, int offset, int length) {
if (length < 0) {
throw new IllegalArgumentException("Negative length " + length);
}
if (offset < 0) {
throw new IndexOutOfBoundsException("Negative start offset " + offset);
}
if (length > bytes.length - offset) {
throw new IndexOutOfBoundsException(
"Invalid range, bytes.length: "
+ bytes.length
+ " offset: "
+ offset
+ " length: "
+ length);
}
char[] chars = new char[length * 2];
for (int i = 0; i < length; i++) {
int unsignedInt = bytes[i + offset] & 0xFF;
chars[2 * i] = HEX_CHARS[unsignedInt >>> 4];
chars[2 * i + 1] = HEX_CHARS[unsignedInt & 0x0F];
}
return new String(chars);
}
}