log files with headers (thanks...

log files with headers (thanks https://stackoverflow.com/questions/34359166/java-logging-using-gethead-with-append)

src/main/java/fr/inrae/agriterix/simulator/dynamics/DynamicsLogFormatter.java

 package fr.inrae.agriterix.simulator.dynamics;
 
-import java.util.logging.Formatter;
-import java.util.logging.LogRecord;
+import java.io.File;
+import java.util.logging.*;
 
 public class DynamicsLogFormatter extends Formatter {
 
+    private String header;
+
+    public DynamicsLogFormatter(String header) {
+        this.header = header;
+    }
+
     @Override
     public String format(LogRecord record) {
         StringBuffer sb = new StringBuffer();
@@ -12,4 +18,37 @@ public class DynamicsLogFormatter extends Formatter {
         return sb.toString();
     }
 
+    @Override
+    public String getHead(Handler h) {
+        boolean writeHeader = true;
+        try {
+            if (h instanceof FileHandler) {
+                writeHeader = lengthOpen((FileHandler) h).longValue() == 0L;
+            }
+        } catch (SecurityException ignore) {
+        }
+
+        if (writeHeader) {
+            return header + "\n"; //TODO: Insert your CSV headers.
+        } else {
+            return super.getHead(h); //Skip headers.
+        }
+    }
+
+    private Number lengthOpen(Handler h) {
+        if (h instanceof FileHandler) {
+            String p = h.getClass().getName();
+            LogManager manager = LogManager.getLogManager();
+            p = manager.getProperty(p.concat(".pattern"));
+            //TODO: Deal with FileHandler patterns.
+            if (p != null) {
+                File f = new File(p);
+                //TODO: Implement file listing and filtering.
+                return f.length();
+            }
+        }
+        return 0L;
+    }
+
+
 }

src/main/java/fr/inrae/agriterix/simulator/dynamics/DynamicsLogger.java

@@ -19,7 +19,7 @@ public class DynamicsLogger {
         private String separator = ", ";
         private String path = "data/out";
 
-        public DynamicsLogger(String className, String timeStamp) {
+        public DynamicsLogger(String className, String timeStamp, String header) {
             try {
                 Files.createDirectories(Paths.get("data/out/" + timeStamp + "/logs/"));
                 fileHandler = new FileHandler("data/out/" + timeStamp + "/logs/" + className + ".csv", false);
@@ -29,7 +29,12 @@ public class DynamicsLogger {
             logger = Logger.getLogger(className);
             logger.setUseParentHandlers(false);
             logger.addHandler(fileHandler);
-            fileHandler.setFormatter(new DynamicsLogFormatter());
+            fileHandler.setFormatter(new DynamicsLogFormatter(header));
+        }
+
+
+        public void setHeader(String header) {
+            logger.info(header);
         }
 
         public void log(int timestep, String message) {

src/main/java/fr/inrae/agriterix/simulator/dynamics/FlowDynamics.java

@@ -22,7 +22,8 @@ public class FlowDynamics extends Dynamics {
 
     @Override
     public void initLogger() {
-        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp);
+        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp, "TIMESTAMP, CATEGORY, FLOW_LABEL, " +
+                "PRODUCT, VALUE");
     }
 
     @Override

src/main/java/fr/inrae/agriterix/simulator/dynamics/MarketDynamics.java

@@ -30,7 +30,8 @@ public class MarketDynamics extends Dynamics {
 
     @Override
     public void initLogger() {
-        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp);
+        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp, "TIMESTAMP, GEOAREA, PRODUCT, " +
+                "AMOUNT, LABEL");
     }
 
     @Override

src/main/java/fr/inrae/agriterix/simulator/dynamics/PopulationDynamics.java

@@ -106,7 +106,7 @@ public class PopulationDynamics extends Dynamics {
 
     @Override
     public void initLogger() {
-        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp);
+        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp, "HEADER");
     }
 
     /**

src/main/java/fr/inrae/agriterix/simulator/dynamics/PopulationDynamicsByAgeClass.java

@@ -63,7 +63,7 @@ public class PopulationDynamicsByAgeClass extends Dynamics {
     
     @Override
     public void initLogger() {
-        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp);
+        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp, "HEADER");
     }
 
     @Override

src/main/java/fr/inrae/agriterix/simulator/dynamics/ProductionDynamics.java

@@ -36,7 +36,8 @@ public class ProductionDynamics extends Dynamics {
 
     @Override
     public void initLogger() {
-        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp);
+        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp, "TIMESTAMP, GEOAREA, PRODUCT, " +
+                "AMOUNT, LABEL");
     }
 
     @Override

src/main/java/fr/inrae/agriterix/simulator/dynamics/StateDynamics.java

@@ -22,7 +22,7 @@ public class StateDynamics extends Dynamics {
 
     @Override
     public void initLogger() {
-        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp);
+        logger = new DynamicsLogger(this.getClass().getSimpleName(), super.timeStamp, "HEADER");
     }
 
     @Override