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package org.openslx.taskmanager.api;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.log4j.Logger;
/**
* Holds the environment that tasks running a system command *should*
* use. The environment is read from a config file.
*/
public class Environment
{
private static final Logger log = Logger.getLogger( Environment.class );
private static Map<String, String> env = null;
public static boolean load( String fileName )
{
if ( env != null )
throw new RuntimeException( "Already loaded" );
try {
Pattern regex = Pattern.compile( "^([a-zA-Z0-9_]+)(|=.*)$" );
FileReader fileReader = new FileReader( fileName );
BufferedReader bufferedReader = new BufferedReader( fileReader );
Map<String, String> env = new LinkedHashMap<>();
String line = null;
while ( ( line = bufferedReader.readLine() ) != null ) {
Matcher m = regex.matcher( line );
if ( !m.matches() )
continue;
String name = m.group( 1 );
String value = m.group( 2 );
if ( value.isEmpty() ) {
value = System.getenv( name );
} else {
value = value.substring( 1 );
}
if ( value != null ) {
env.put( name, value );
}
}
bufferedReader.close();
Environment.env = env;
log.info( "Loaded " + env.size() + " environment lines." );
} catch ( IOException e ) {
log.info( "Could not load environment definition from " + fileName + ". Processes might use the same environment as this thread." );
return false;
}
return true;
}
public static Map<String, String> get()
{
return Collections.unmodifiableMap( env );
}
}
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