Move Environment class to API, fix loading from file

1 files changed, 68 insertions, 0 deletions

diff --git a/api/src/main/java/org/openslx/taskmanager/api/Environment.java b/api/src/main/java/org/openslx/taskmanager/api/Environment.java
new file mode 100644
index 0000000..3942ec5
--- /dev/null
+++ b/api/src/main/java/org/openslx/taskmanager/api/Environment.java
@@ -0,0 +1,68 @@
+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 );
+	}
+
+}