added sources for Slick

Former-commit-id: 1647fa32ef6894bd7db44f741f07c2f4dcdf9054
Former-commit-id: 0e5810dcfbe1fd59b13e7cabe9f1e93c5542da2d

lib/slick-source/org/newdawn/slick/util/Log.java

@@ -0,0 +1,161 @@
+package org.newdawn.slick.util;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+/**
+ * A simple central logging system
+ * 
+ * @author kevin
+ */
+public final class Log {
+	/** True if we're doing verbose logging INFO and DEBUG */
+	private static boolean verbose = true;
+	/** true if activated by the system property "org.newdawn.slick.forceVerboseLog" */
+	private static boolean forcedVerbose = false;
+	
+	/**
+	 * The debug property which can be set via JNLP or startup parameter to switch
+	 * logging mode to verbose for games that were released without verbose logging
+	 * value must be "true"
+	 */
+	private static final String forceVerboseProperty = "org.newdawn.slick.forceVerboseLog";
+	
+	/**
+	 * the verbose property must be set to "true" to switch on verbose logging
+	 */
+	private static final String forceVerbosePropertyOnValue = "true";
+	
+	/** The log system plugin in use */
+	private static LogSystem logSystem = new DefaultLogSystem();
+	
+	/**
+	 * The log is a simple static utility, no construction
+	 */
+	private Log() {
+		
+	}
+	
+	/**
+	 * Set the log system that will have all of the log info 
+	 * sent to it.
+	 * 
+	 * @param system The system to use for logging.
+	 */
+	public static void setLogSystem(LogSystem system) {
+		logSystem = system;
+	}
+	
+	/**
+	 * Indicate that we want verbose logging.
+	 * The call is ignored if verbose logging is forced by the system property
+	 * "org.newdawn.slick.forceVerboseLog"
+	 * 
+	 * @param v True if we want verbose logging (INFO and DEBUG)
+	 */
+	public static void setVerbose(boolean v) {
+		if (forcedVerbose)
+			return;
+		verbose = v;
+	}
+
+	/**
+	 * Check if the system property org.newdawn.slick.verboseLog is set to true.
+	 * If this is the case we activate the verbose logging mode
+	 */
+	public static void checkVerboseLogSetting() {
+		try {
+			AccessController.doPrivileged(new PrivilegedAction() {
+	            public Object run() {
+					String val = System.getProperty(Log.forceVerboseProperty);
+					if ((val != null) && (val.equalsIgnoreCase(Log.forceVerbosePropertyOnValue))) {
+						Log.setForcedVerboseOn();
+					}
+					
+					return null;
+	            }
+			});
+		} catch (Throwable e) {
+			// ignore, security failure - probably an applet
+		}
+	}
+	
+	/**
+	 * Indicate that we want verbose logging, even if switched off in game code.
+	 * Only be called when system property "org.newdawn.slick.forceVerboseLog" is set to true.
+	 * You must not call this method directly.
+	 */
+	public static void setForcedVerboseOn() {
+		forcedVerbose = true;
+		verbose = true;
+	}
+	
+	/**
+	 * Log an error
+	 * 
+	 * @param message The message describing the error
+	 * @param e The exception causing the error
+	 */
+	public static void error(String message, Throwable e) {
+		logSystem.error(message, e);
+	}
+
+	/**
+	 * Log an error
+	 * 
+	 * @param e The exception causing the error
+	 */
+	public static void error(Throwable e) {
+		logSystem.error(e);
+	}
+
+	/**
+	 * Log an error
+	 * 
+	 * @param message The message describing the error
+	 */
+	public static void error(String message) {
+		logSystem.error(message);
+	}
+
+	/**
+	 * Log a warning
+	 * 
+	 * @param message The message describing the warning
+	 */
+	public static void warn(String message) {
+		logSystem.warn(message);
+	}
+	
+	/**
+	 * Log a warning
+	 * 
+	 * @param message The message describing the warning
+	 * @param e The issue causing the warning
+	 */
+	public static void warn(String message, Throwable e) {
+		logSystem.warn(message, e);
+	}
+
+	/**
+	 * Log an information message
+	 * 
+	 * @param message The message describing the infomation
+	 */
+	public static void info(String message) {
+		if (verbose || forcedVerbose) {
+			logSystem.info(message);
+		}
+	}
+
+	/**
+	 * Log a debug message
+	 * 
+	 * @param message The message describing the debug
+	 */
+	public static void debug(String message) {
+		if (verbose || forcedVerbose) {
+			logSystem.debug(message);
+		}
+	}
+}