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package org.openslx.util;
import java.io.Closeable;
import org.apache.log4j.Logger;
public class Util
{
private static Logger log = Logger.getLogger( Util.class );
/**
* Check if the given object is null, abort program if true. An optional
* message to be printed can be passed. A stack trace will be printed, too.
* Finally the application terminates with exit code 2.
*
* This comes in handy if something must not be null, and you want user
* friendly output. A perfect example would be reading settings from a
* config file. You can use this on mandatory fields.
*
* @param something
* the object to compare to null
* @param message
* the message to be printed if something is null
*/
public static void notNullFatal( Object something, String message )
{
if ( something == null ) {
if ( message != null )
log.fatal( "[NOTNULL] " + message );
log.warn( Thread.currentThread().getStackTrace().toString() );
System.exit( 2 );
}
}
public static void notNullOrEmptyFatal( String something, String message )
{
if ( something == null || something.isEmpty() ) {
if ( message != null )
log.fatal( "[NOTNULL] " + message );
log.warn( Thread.currentThread().getStackTrace().toString() );
System.exit( 2 );
}
}
/**
* Parse the given String as a base10 integer.
* If the string does not represent a valid integer, return the given
* default value.
*
* @param value string representation to parse to an int
* @param defaultValue fallback value if given string can't be parsed
* @return
*/
public static int parseInt( String value, int defaultValue )
{
try {
return Integer.parseInt( value );
} catch ( Exception e ) {
return defaultValue;
}
}
public static void safeClose( Closeable... closeable )
{
for ( Closeable c : closeable ) {
if ( c == null )
continue;
try {
c.close();
} catch ( Throwable t ) {
}
}
}
public static void safeClose( AutoCloseable... closeable )
{
for ( AutoCloseable c : closeable ) {
if ( c == null )
continue;
try {
c.close();
} catch ( Throwable t ) {
}
}
}
public static boolean sleep( int millis )
{
try {
Thread.sleep( millis );
return true;
} catch ( InterruptedException e ) {
Thread.currentThread().interrupt();
return false;
}
}
public static boolean joinThread( Thread t )
{
try {
t.join();
return true;
} catch ( InterruptedException e ) {
return false;
}
}
public static long unixTime()
{
return System.currentTimeMillis() / 1000;
}
}
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