started to implement log file parsing

java/com.sap.sailing.domain.deckmanadapter/src/com/sap/sailing/domain/deckmanadapter/impl/LogFile.java

@@ -0,0 +1,64 @@
+package com.sap.sailing.domain.deckmanadapter.impl;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.text.ParseException;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+/**
+ * A log file as produced by Deckman, in CSV format. The first line is expected to contain the column headers.
+ * Column headers not found in {@link FieldType} are ignored with a warning being logged.
+ * 
+ * @author Axel Uhl (D043530)
+ *
+ */
+public class LogFile implements Iterator<Record> {
+    private final FieldType[] fieldTypes;
+    private final BufferedReader bufferedReader;
+    private String nextLine;
+    
+    /**
+     * Reads the header from the reader to initialize {@link #fieldTypes}. Afterwards, using the {@link #iterator},
+     * the records can be read one by one.
+     */
+    public LogFile(Reader r) throws IOException {
+        bufferedReader = new BufferedReader(r);
+        String header = bufferedReader.readLine();
+        String[] fieldNames = header.split(",");
+        fieldTypes = new FieldType[fieldNames.length];
+        for (int i=0; i<fieldNames.length; i++) {
+            fieldTypes[i] = FieldType.valueOf(fieldNames[i]);
+        }
+        nextLine = bufferedReader.readLine();
+    }
+
+    @Override
+    public boolean hasNext() {
+        return nextLine != null;
+    }
+
+    @Override
+    public Record next() {
+        final Map<FieldType, String> fieldsAsStrings = new HashMap<>();
+        final String[] fieldValues = nextLine.split(",");
+        try {
+            nextLine = bufferedReader.readLine();
+            for (int i = 0; i < fieldValues.length; i++) {
+                fieldsAsStrings.put(fieldTypes[i], fieldValues[i]);
+            }
+            final Record result = new Record(fieldsAsStrings);
+            return result;
+        } catch (ParseException | IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void remove() {
+        throw new UnsupportedOperationException("remove() is not supported on a Deckman log file");
+    }
+
+}