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*******************************************************************************
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package sun.text.normalizer;
import java.util.HashMap;
Class to store version numbers of the form major.minor.milli.micro.
Author: synwee @stable ICU 2.6
/**
* Class to store version numbers of the form major.minor.milli.micro.
* @author synwee
* @stable ICU 2.6
*/
public final class VersionInfo
{
// public methods ------------------------------------------------------
Returns an instance of VersionInfo with the argument version.
Params: - version – version String in the format of "major.minor.milli.micro" or "major.minor.milli" or "major.minor" or "major", where major, minor, milli, micro are non-negative numbers <= 255. If the trailing version numbers are not specified they are taken as 0s. E.g. Version "3.1" is equivalent to "3.1.0.0".
Throws: - throws an IllegalArgumentException when the argument version
– is not in the right format
Returns: an instance of VersionInfo with the argument version. @stable ICU 2.6
/**
* Returns an instance of VersionInfo with the argument version.
* @param version version String in the format of "major.minor.milli.micro"
* or "major.minor.milli" or "major.minor" or "major",
* where major, minor, milli, micro are non-negative numbers
* {@literal <=} 255. If the trailing version numbers are
* not specified they are taken as 0s. E.g. Version "3.1" is
* equivalent to "3.1.0.0".
* @return an instance of VersionInfo with the argument version.
* @exception throws an IllegalArgumentException when the argument version
* is not in the right format
* @stable ICU 2.6
*/
public static VersionInfo getInstance(String version)
{
int length = version.length();
int array[] = {0, 0, 0, 0};
int count = 0;
int index = 0;
while (count < 4 && index < length) {
char c = version.charAt(index);
if (c == '.') {
count ++;
}
else {
c -= '0';
if (c < 0 || c > 9) {
throw new IllegalArgumentException(INVALID_VERSION_NUMBER_);
}
array[count] *= 10;
array[count] += c;
}
index ++;
}
if (index != length) {
throw new IllegalArgumentException(
"Invalid version number: String '" + version + "' exceeds version format");
}
for (int i = 0; i < 4; i ++) {
if (array[i] < 0 || array[i] > 255) {
throw new IllegalArgumentException(INVALID_VERSION_NUMBER_);
}
}
return getInstance(array[0], array[1], array[2], array[3]);
}
Returns an instance of VersionInfo with the argument version.
Params: - major – major version, non-negative number <= 255.
- minor – minor version, non-negative number <= 255.
- milli – milli version, non-negative number <= 255.
- micro – micro version, non-negative number <= 255.
Throws: - throws an IllegalArgumentException when either arguments are
– negative or > 255
@stable ICU 2.6
/**
* Returns an instance of VersionInfo with the argument version.
* @param major major version, non-negative number {@literal <=} 255.
* @param minor minor version, non-negative number {@literal <=} 255.
* @param milli milli version, non-negative number {@literal <=} 255.
* @param micro micro version, non-negative number {@literal <=} 255.
* @exception throws an IllegalArgumentException when either arguments are
* negative or {@literal >} 255
* @stable ICU 2.6
*/
public static VersionInfo getInstance(int major, int minor, int milli,
int micro)
{
// checks if it is in the hashmap
// else
if (major < 0 || major > 255 || minor < 0 || minor > 255 ||
milli < 0 || milli > 255 || micro < 0 || micro > 255) {
throw new IllegalArgumentException(INVALID_VERSION_NUMBER_);
}
int version = getInt(major, minor, milli, micro);
Integer key = Integer.valueOf(version);
Object result = MAP_.get(key);
if (result == null) {
result = new VersionInfo(version);
MAP_.put(key, result);
}
return (VersionInfo)result;
}
Compares other with this VersionInfo.
Params: - other – VersionInfo to be compared
Returns: 0 if the argument is a VersionInfo object that has version
information equals to this object.
Less than 0 if the argument is a VersionInfo object that has
version information greater than this object.
Greater than 0 if the argument is a VersionInfo object that
has version information less than this object. @stable ICU 2.6
/**
* Compares other with this VersionInfo.
* @param other VersionInfo to be compared
* @return 0 if the argument is a VersionInfo object that has version
* information equals to this object.
* Less than 0 if the argument is a VersionInfo object that has
* version information greater than this object.
* Greater than 0 if the argument is a VersionInfo object that
* has version information less than this object.
* @stable ICU 2.6
*/
public int compareTo(VersionInfo other)
{
return m_version_ - other.m_version_;
}
// private data members ----------------------------------------------
Version number stored as a byte for each of the major, minor, milli and
micro numbers in the 32 bit int.
Most significant for the major and the least significant contains the
micro numbers.
/**
* Version number stored as a byte for each of the major, minor, milli and
* micro numbers in the 32 bit int.
* Most significant for the major and the least significant contains the
* micro numbers.
*/
private int m_version_;
Map of singletons
/**
* Map of singletons
*/
private static final HashMap<Integer, Object> MAP_ = new HashMap<>();
Error statement string
/**
* Error statement string
*/
private static final String INVALID_VERSION_NUMBER_ =
"Invalid version number: Version number may be negative or greater than 255";
// private constructor -----------------------------------------------
Constructor with int
Params: - compactversion – a 32 bit int with each byte representing a number
/**
* Constructor with int
* @param compactversion a 32 bit int with each byte representing a number
*/
private VersionInfo(int compactversion)
{
m_version_ = compactversion;
}
Gets the int from the version numbers
Params: - major – non-negative version number
- minor – non-negativeversion number
- milli – non-negativeversion number
- micro – non-negativeversion number
/**
* Gets the int from the version numbers
* @param major non-negative version number
* @param minor non-negativeversion number
* @param milli non-negativeversion number
* @param micro non-negativeversion number
*/
private static int getInt(int major, int minor, int milli, int micro)
{
return (major << 24) | (minor << 16) | (milli << 8) | micro;
}
}