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/*
* Copyright (C) 2015 Samsung System LSI
* Licensed 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 com.android.bluetooth;
import java.io.UnsupportedEncodingException;
import com.android.bluetooth.map.BluetoothMapUtils;
/**
* Class to represent a 128bit value using two long member variables.
* Has functionality to convert to/from hex-strings.
* Mind that since signed variables are used to store the value internally
* is used, the MSB/LSB long values can be negative.
*/
public class SignedLongLong implements Comparable<SignedLongLong> {
private long mMostSigBits;
private long mLeastSigBits;
public SignedLongLong(long leastSigBits, long mostSigBits) {
this.mMostSigBits = mostSigBits;
this.mLeastSigBits = leastSigBits;
}
/**
* Create a SignedLongLong from a Hex-String without "0x" prefix
* @param value the hex-string
* @return the created object
* @throws UnsupportedEncodingException
*/
public static SignedLongLong fromString(String value) throws UnsupportedEncodingException {
String lsbStr, msbStr;
long lsb = 0, msb = 0;
lsbStr = msbStr = null;
if(value == null) throw new NullPointerException();
value=value.trim();
int valueLength = value.length();
if(valueLength == 0 || valueLength > 32) {
throw new NumberFormatException("invalid string length: " + valueLength);
}
if(valueLength <= 16){
lsbStr = value;
} else {
lsbStr = value.substring(valueLength-16, valueLength);
msbStr = value.substring(0, valueLength-16);
msb = BluetoothMapUtils.getLongFromString(msbStr);
}
lsb = BluetoothMapUtils.getLongFromString(lsbStr);
return new SignedLongLong(lsb, msb);
}
@Override
public int compareTo(SignedLongLong another) {
if(mMostSigBits == another.mMostSigBits) {
if(mLeastSigBits == another.mLeastSigBits) {
return 0;
}
if(mLeastSigBits < another.mLeastSigBits) {
return -1;
}
return 1;
}
if(mMostSigBits < another.mMostSigBits) {
return -1;
}
return 1;
}
@Override
public String toString() {
return toHexString();
}
/**
*
* @return a hex-string representation of the object values
*/
public String toHexString(){
return BluetoothMapUtils.getLongLongAsString(mLeastSigBits, mMostSigBits);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
SignedLongLong other = (SignedLongLong) obj;
if (mLeastSigBits != other.mLeastSigBits) {
return false;
}
if (mMostSigBits != other.mMostSigBits) {
return false;
}
return true;
}
public long getMostSignificantBits() {
return mMostSigBits;
}
public long getLeastSignificantBits() {
return mLeastSigBits;
}
}
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