com.mysql.jdbc.Util Maven / Gradle / Ivy
/*
Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FLOSS License Exception
.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc;
import java.io.ObjectInputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.TimeZone;
/**
* Various utility methods for the driver.
*/
public class Util {
protected final static Method systemNanoTimeMethod;
static {
Method aMethod;
try {
aMethod = System.class.getMethod("nanoTime", (Class[]) null);
} catch (SecurityException e) {
aMethod = null;
} catch (NoSuchMethodException e) {
aMethod = null;
}
systemNanoTimeMethod = aMethod;
}
public static boolean nanoTimeAvailable() {
return systemNanoTimeMethod != null;
}
private static Method CAST_METHOD;
// cache this ourselves, as the method call is statically-synchronized in all but JDK6!
private static final TimeZone DEFAULT_TIMEZONE = TimeZone.getDefault();
static final TimeZone getDefaultTimeZone() {
return (TimeZone) DEFAULT_TIMEZONE.clone();
}
class RandStructcture {
long maxValue;
double maxValueDbl;
long seed1;
long seed2;
}
private static Util enclosingInstance = new Util();
private static boolean isJdbc4 = false;
private static boolean isColdFusion = false;
static {
try {
CAST_METHOD = Class.class.getMethod("cast", new Class[] { Object.class });
} catch (Throwable t) {
// ignore - not available in this VM
}
try {
Class.forName("java.sql.NClob");
isJdbc4 = true;
} catch (Throwable t) {
isJdbc4 = false;
}
//
// Detect the ColdFusion MX environment
//
// Unfortunately, no easy-to-discern classes are available to our classloader to check...
//
String loadedFrom = stackTraceToString(new Throwable());
if (loadedFrom != null) {
isColdFusion = loadedFrom.indexOf("coldfusion") != -1;
} else {
isColdFusion = false;
}
}
public static boolean isJdbc4() {
return isJdbc4;
}
public static boolean isColdFusion() {
return isColdFusion;
}
// Right from Monty's code
public static String newCrypt(String password, String seed) {
byte b;
double d;
if ((password == null) || (password.length() == 0)) {
return password;
}
long[] pw = newHash(seed);
long[] msg = newHash(password);
long max = 0x3fffffffL;
long seed1 = (pw[0] ^ msg[0]) % max;
long seed2 = (pw[1] ^ msg[1]) % max;
char[] chars = new char[seed.length()];
for (int i = 0; i < seed.length(); i++) {
seed1 = ((seed1 * 3) + seed2) % max;
seed2 = (seed1 + seed2 + 33) % max;
d = (double) seed1 / (double) max;
b = (byte) java.lang.Math.floor((d * 31) + 64);
chars[i] = (char) b;
}
seed1 = ((seed1 * 3) + seed2) % max;
seed2 = (seed1 + seed2 + 33) % max;
d = (double) seed1 / (double) max;
b = (byte) java.lang.Math.floor(d * 31);
for (int i = 0; i < seed.length(); i++) {
chars[i] ^= (char) b;
}
return new String(chars);
}
static long[] newHash(String password) {
long nr = 1345345333L;
long add = 7;
long nr2 = 0x12345671L;
long tmp;
for (int i = 0; i < password.length(); ++i) {
if ((password.charAt(i) == ' ') || (password.charAt(i) == '\t')) {
continue; // skip spaces
}
tmp = (0xff & password.charAt(i));
nr ^= ((((nr & 63) + add) * tmp) + (nr << 8));
nr2 += ((nr2 << 8) ^ nr);
add += tmp;
}
long[] result = new long[2];
result[0] = nr & 0x7fffffffL;
result[1] = nr2 & 0x7fffffffL;
return result;
}
public static String oldCrypt(String password, String seed) {
long hp;
long hm;
long s1;
long s2;
long max = 0x01FFFFFF;
double d;
byte b;
if ((password == null) || (password.length() == 0)) {
return password;
}
hp = oldHash(seed);
hm = oldHash(password);
long nr = hp ^ hm;
nr %= max;
s1 = nr;
s2 = nr / 2;
char[] chars = new char[seed.length()];
for (int i = 0; i < seed.length(); i++) {
s1 = ((s1 * 3) + s2) % max;
s2 = (s1 + s2 + 33) % max;
d = (double) s1 / max;
b = (byte) java.lang.Math.floor((d * 31) + 64);
chars[i] = (char) b;
}
return new String(chars);
}
static long oldHash(String password) {
long nr = 1345345333;
long nr2 = 7;
long tmp;
for (int i = 0; i < password.length(); i++) {
if ((password.charAt(i) == ' ') || (password.charAt(i) == '\t')) {
continue;
}
tmp = password.charAt(i);
nr ^= ((((nr & 63) + nr2) * tmp) + (nr << 8));
nr2 += tmp;
}
return nr & ((1L << 31) - 1L);
}
private static RandStructcture randomInit(long seed1, long seed2) {
RandStructcture randStruct = enclosingInstance.new RandStructcture();
randStruct.maxValue = 0x3FFFFFFFL;
randStruct.maxValueDbl = randStruct.maxValue;
randStruct.seed1 = seed1 % randStruct.maxValue;
randStruct.seed2 = seed2 % randStruct.maxValue;
return randStruct;
}
/**
* Given a ResultSet and an index into the columns of that ResultSet, read
* binary data from the column which represents a serialized object, and
* re-create the object.
*
* @param resultSet
* the ResultSet to use.
* @param index
* an index into the ResultSet.
* @return the object if it can be de-serialized
* @throws Exception
* if an error occurs
*/
public static Object readObject(java.sql.ResultSet resultSet, int index) throws Exception {
ObjectInputStream objIn = new ObjectInputStream(resultSet.getBinaryStream(index));
Object obj = objIn.readObject();
objIn.close();
return obj;
}
private static double rnd(RandStructcture randStruct) {
randStruct.seed1 = ((randStruct.seed1 * 3) + randStruct.seed2) % randStruct.maxValue;
randStruct.seed2 = (randStruct.seed1 + randStruct.seed2 + 33) % randStruct.maxValue;
return ((randStruct.seed1) / randStruct.maxValueDbl);
}
/**
* @param message
* @param password
*/
public static String scramble(String message, String password) {
long[] hashPass;
long[] hashMessage;
byte[] to = new byte[8];
String val = "";
message = message.substring(0, 8);
if ((password != null) && (password.length() > 0)) {
hashPass = newHash(password);
hashMessage = newHash(message);
RandStructcture randStruct = randomInit(hashPass[0] ^ hashMessage[0], hashPass[1] ^ hashMessage[1]);
int msgPos = 0;
int msgLength = message.length();
int toPos = 0;
while (msgPos++ < msgLength) {
to[toPos++] = (byte) (Math.floor(rnd(randStruct) * 31) + 64);
}
/* Make it harder to break */
byte extra = (byte) (Math.floor(rnd(randStruct) * 31));
for (int i = 0; i < to.length; i++) {
to[i] ^= extra;
}
val = StringUtils.toString(to);
}
return val;
}
/**
* Converts a nested exception into a nicer message
*
* @param ex
* the exception to expand into a message.
*
* @return a message containing the exception, the message (if any), and a
* stacktrace.
*/
public static String stackTraceToString(Throwable ex) {
StringBuffer traceBuf = new StringBuffer();
traceBuf.append(Messages.getString("Util.1"));
if (ex != null) {
traceBuf.append(ex.getClass().getName());
String message = ex.getMessage();
if (message != null) {
traceBuf.append(Messages.getString("Util.2"));
traceBuf.append(message);
}
StringWriter out = new StringWriter();
PrintWriter printOut = new PrintWriter(out);
ex.printStackTrace(printOut);
traceBuf.append(Messages.getString("Util.3"));
traceBuf.append(out.toString());
}
traceBuf.append(Messages.getString("Util.4"));
return traceBuf.toString();
}
public static Object getInstance(String className, Class[] argTypes, Object[] args, ExceptionInterceptor exceptionInterceptor) throws SQLException {
try {
return handleNewInstance(Class.forName(className).getConstructor(argTypes), args, exceptionInterceptor);
} catch (SecurityException e) {
throw SQLError.createSQLException("Can't instantiate required class", SQLError.SQL_STATE_GENERAL_ERROR, e, exceptionInterceptor);
} catch (NoSuchMethodException e) {
throw SQLError.createSQLException("Can't instantiate required class", SQLError.SQL_STATE_GENERAL_ERROR, e, exceptionInterceptor);
} catch (ClassNotFoundException e) {
throw SQLError.createSQLException("Can't instantiate required class", SQLError.SQL_STATE_GENERAL_ERROR, e, exceptionInterceptor);
}
}
/**
* Handles constructing new instance with the given constructor and wrapping
* (or not, as required) the exceptions that could possibly be generated
*/
public static final Object handleNewInstance(Constructor ctor, Object[] args, ExceptionInterceptor exceptionInterceptor) throws SQLException {
try {
return ctor.newInstance(args);
} catch (IllegalArgumentException e) {
throw SQLError.createSQLException("Can't instantiate required class", SQLError.SQL_STATE_GENERAL_ERROR, e, exceptionInterceptor);
} catch (InstantiationException e) {
throw SQLError.createSQLException("Can't instantiate required class", SQLError.SQL_STATE_GENERAL_ERROR, e, exceptionInterceptor);
} catch (IllegalAccessException e) {
throw SQLError.createSQLException("Can't instantiate required class", SQLError.SQL_STATE_GENERAL_ERROR, e, exceptionInterceptor);
} catch (InvocationTargetException e) {
Throwable target = e.getTargetException();
if (target instanceof SQLException) {
throw (SQLException) target;
}
if (target instanceof ExceptionInInitializerError) {
target = ((ExceptionInInitializerError) target).getException();
}
throw SQLError.createSQLException(target.toString(), SQLError.SQL_STATE_GENERAL_ERROR, target, exceptionInterceptor);
}
}
/**
* Does a network interface exist locally with the given hostname?
*
* @param hostname
* the hostname (or IP address in string form) to check
* @return true if it exists, false if no, or unable to determine due to VM
* version support of java.net.NetworkInterface
*/
public static boolean interfaceExists(String hostname) {
try {
Class networkInterfaceClass = Class.forName("java.net.NetworkInterface");
return networkInterfaceClass.getMethod("getByName", (Class[]) null).invoke(networkInterfaceClass, new Object[] { hostname }) != null;
} catch (Throwable t) {
return false;
}
}
/**
* Reflexive access on JDK-1.5's Class.cast() method so we don't have to
* move that out into separate classes built for JDBC-4.0.
*
* @param invokeOn
* @param toCast
* @return
*/
public static Object cast(Object invokeOn, Object toCast) {
if (CAST_METHOD != null) {
try {
return CAST_METHOD.invoke(invokeOn, new Object[] { toCast });
} catch (Throwable t) {
return null;
}
}
return null;
}
public static long getCurrentTimeNanosOrMillis() {
if (systemNanoTimeMethod != null) {
try {
return ((Long) systemNanoTimeMethod.invoke(null, (Object[]) null)).longValue();
} catch (IllegalArgumentException e) {
// ignore - fall through to currentTimeMillis()
} catch (IllegalAccessException e) {
// ignore - fall through to currentTimeMillis()
} catch (InvocationTargetException e) {
// ignore - fall through to currentTimeMillis()
}
}
return System.currentTimeMillis();
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void resultSetToMap(Map mappedValues, java.sql.ResultSet rs) throws SQLException {
while (rs.next()) {
mappedValues.put(rs.getObject(1), rs.getObject(2));
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void resultSetToMap(Map mappedValues, java.sql.ResultSet rs, int key, int value) throws SQLException {
while (rs.next()) {
mappedValues.put(rs.getObject(key), rs.getObject(value));
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void resultSetToMap(Map mappedValues, java.sql.ResultSet rs, String key, String value) throws SQLException {
while (rs.next()) {
mappedValues.put(rs.getObject(key), rs.getObject(value));
}
}
public static Map calculateDifferences(Map map1, Map map2) {
Map diffMap = new HashMap();
for (Map.Entry entry : map1.entrySet()) {
Object key = entry.getKey();
Number value1 = null;
Number value2 = null;
if (entry.getValue() instanceof Number) {
value1 = (Number) entry.getValue();
value2 = (Number) map2.get(key);
} else {
try {
value1 = new Double(entry.getValue().toString());
value2 = new Double(map2.get(key).toString());
} catch (NumberFormatException nfe) {
continue;
}
}
if (value1.equals(value2)) {
continue;
}
if (value1 instanceof Byte) {
diffMap.put(key, Byte.valueOf((byte) (((Byte) value2).byteValue() - ((Byte) value1).byteValue())));
} else if (value1 instanceof Short) {
diffMap.put(key, Short.valueOf((short) (((Short) value2).shortValue() - ((Short) value1).shortValue())));
} else if (value1 instanceof Integer) {
diffMap.put(key, Integer.valueOf((((Integer) value2).intValue() - ((Integer) value1).intValue())));
} else if (value1 instanceof Long) {
diffMap.put(key, Long.valueOf((((Long) value2).longValue() - ((Long) value1).longValue())));
} else if (value1 instanceof Float) {
diffMap.put(key, Float.valueOf(((Float) value2).floatValue() - ((Float) value1).floatValue()));
} else if (value1 instanceof Double) {
diffMap.put(key, Double.valueOf((((Double) value2).shortValue() - ((Double) value1).shortValue())));
} else if (value1 instanceof BigDecimal) {
diffMap.put(key, ((BigDecimal) value2).subtract((BigDecimal) value1));
} else if (value1 instanceof BigInteger) {
diffMap.put(key, ((BigInteger) value2).subtract((BigInteger) value1));
}
}
return diffMap;
}
/**
* Returns initialized instances of classes listed in extensionClassNames.
* There is no need to call Extension.init() method after that if you don't change connection or properties.
*
* @param conn
* @param props
* @param extensionClassNames
* @param errorMessageKey
* @param exceptionInterceptor
* @throws SQLException
*/
public static List loadExtensions(Connection conn, Properties props, String extensionClassNames, String errorMessageKey,
ExceptionInterceptor exceptionInterceptor) throws SQLException {
List extensionList = new LinkedList();
List interceptorsToCreate = StringUtils.split(extensionClassNames, ",", true);
String className = null;
try {
for (int i = 0, s = interceptorsToCreate.size(); i < s; i++) {
className = interceptorsToCreate.get(i);
Extension extensionInstance = (Extension) Class.forName(className).newInstance();
extensionInstance.init(conn, props);
extensionList.add(extensionInstance);
}
} catch (Throwable t) {
SQLException sqlEx = SQLError.createSQLException(Messages.getString(errorMessageKey, new Object[] { className }), exceptionInterceptor);
sqlEx.initCause(t);
throw sqlEx;
}
return extensionList;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy