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/*
* Distributed as part of mchange-commons-java v.0.2.3
*
* Copyright (C) 2012 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1, as
* published by the Free Software Foundation.
*
* This software 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software; see the file LICENSE. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
package com.mchange.v2.lang;
import com.mchange.v2.log.*;
import com.mchange.v1.util.StringTokenizerUtils;
public final class VersionUtils
{
private final static MLogger logger = MLog.getLogger( VersionUtils.class );
private final static int[] DFLT_VERSION_ARRAY = {1,1};
private final static int[] JDK_VERSION_ARRAY;
private final static int JDK_VERSION; //two digit int... 10 for 1.0, 11 for 1.1, etc.
private final static Integer NUM_BITS;
static
{
String vstr = System.getProperty( "java.version" );
int[] v;
if (vstr == null)
{
if (logger.isLoggable( MLevel.WARNING ))
logger.warning("Could not find java.version System property. Defaulting to JDK 1.1");
v = DFLT_VERSION_ARRAY;
}
else
{
try { v = extractVersionNumberArray( vstr ); }
catch ( NumberFormatException e )
{
if (logger.isLoggable( MLevel.WARNING ))
logger.warning("java.version ''" + vstr + "'' could not be parsed. Defaulting to JDK 1.1.");
v = DFLT_VERSION_ARRAY;
}
}
int jdkv = 0;
if (v.length > 0)
jdkv += (v[0] * 10);
if (v.length > 1)
jdkv += (v[1]);
JDK_VERSION_ARRAY = v;
JDK_VERSION = jdkv;
//System.err.println( JDK_VERSION );
Integer tmpNumBits;
try
{
String numBitsStr = System.getProperty("sun.arch.data.model");
if (numBitsStr == null)
tmpNumBits = null;
else
tmpNumBits = new Integer( numBitsStr );
}
catch (Exception e)
{
tmpNumBits = null;
}
if (tmpNumBits == null || tmpNumBits.intValue() == 32 || tmpNumBits.intValue() == 64)
NUM_BITS = tmpNumBits;
else
{
if ( logger.isLoggable( MLevel.WARNING ) )
logger.warning("Determined a surprising jvmNumerOfBits: " + tmpNumBits +
". Setting jvmNumberOfBits to unknown (null).");
NUM_BITS = null;
}
}
/**
* @return null if unknown,
* an Integer (as of 2006 always 32 or 64)
* otherwise
*/
public static Integer jvmNumberOfBits()
{ return NUM_BITS; }
public static boolean isJavaVersion10()
{ return (JDK_VERSION == 10); }
public static boolean isJavaVersion11()
{ return (JDK_VERSION == 11); }
public static boolean isJavaVersion12()
{ return (JDK_VERSION == 12); }
public static boolean isJavaVersion13()
{ return (JDK_VERSION == 13); }
public static boolean isJavaVersion14()
{ return (JDK_VERSION == 14); }
public static boolean isJavaVersion15()
{ return (JDK_VERSION == 15); }
public static boolean isAtLeastJavaVersion10()
{ return (JDK_VERSION >= 10); }
public static boolean isAtLeastJavaVersion11()
{ return (JDK_VERSION >= 11); }
public static boolean isAtLeastJavaVersion12()
{ return (JDK_VERSION >= 12); }
public static boolean isAtLeastJavaVersion13()
{ return (JDK_VERSION >= 13); }
public static boolean isAtLeastJavaVersion14()
{ return (JDK_VERSION >= 14); }
public static boolean isAtLeastJavaVersion15()
{ return (JDK_VERSION >= 15); }
public static boolean isAtLeastJavaVersion16()
{ return (JDK_VERSION >= 16); }
public static boolean isAtLeastJavaVersion17()
{ return (JDK_VERSION >= 17); }
public static int[] extractVersionNumberArray(String versionString)
throws NumberFormatException
{ return extractVersionNumberArray( versionString, versionString.split("\\D+") ); }
public static int[] extractVersionNumberArray(String versionString, String delims)
throws NumberFormatException
{
String[] intStrs = StringTokenizerUtils.tokenizeToArray( versionString, delims, false );
return extractVersionNumberArray( versionString, intStrs );
}
private static int[] extractVersionNumberArray(String versionString, String[] intStrs)
throws NumberFormatException
{
int len = intStrs.length;
int[] out = new int[ len ];
for (int i = 0; i < len; ++i)
{
try
{
out[i] = Integer.parseInt( intStrs[i] );
}
catch (NumberFormatException e)
{
if (i <= 1) //we don't even have the major version, e.g. 1.2
throw e; // just bail
else //we'll make do with what we have
{
if (logger.isLoggable(MLevel.INFO))
logger.log(MLevel.INFO,
"JVM version string (" +
versionString +
") contains non-integral component (" + intStrs[i] +
"). Using precending components only to resolve JVM version.");
int[] goodEnough = new int[i];
System.arraycopy(out, 0, goodEnough, 0, i);
out = goodEnough;
break;
}
}
}
return out;
}
public boolean prefixMatches( int[] pfx, int[] fullVersion )
{
if (pfx.length > fullVersion.length)
return false;
else
{
for (int i = 0, len = pfx.length; i < len; ++i)
if (pfx[i] != fullVersion[i])
return false;
return true;
}
}
public static int lexicalCompareVersionNumberArrays(int[] a, int[] b)
{
int alen = a.length;
int blen = b.length;
for (int i = 0; i < alen; ++i)
{
if (i == blen)
return 1; //a is larger if they are the same to a point, but a has an extra version number
else if (a[i] > b[i])
return 1;
else if (a[i] < b[i])
return -1;
}
if (blen > alen)
return -1; //a is smaller if they are the same to a point, but b has an extra version number
else
return 0;
}
}
