Implemented Dimension (as GroupKey) and a CompoundGroupKey

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/Dimension.java

@@ -0,0 +1,24 @@
+package com.sap.sailing.datamining;
+
+import com.sap.sailing.datamining.shared.GroupKey;
+
+public interface Dimension extends GroupKey {
+    
+    public enum Type {
+        
+        RegattaName, RaceName, LegNumber,
+        CourseArea,
+        Fleet,
+        BoatClassName,
+        Year,
+        LegType,
+        CompetitorName,
+        SailID,
+        Nationality,
+        WindStrength
+
+    }
+    
+    public Type getType();
+
+}

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/impl/AbstractGroupKey.java

@@ -0,0 +1,18 @@
+package com.sap.sailing.datamining.impl;
+
+import com.sap.sailing.datamining.shared.GroupKey;
+
+public abstract class AbstractGroupKey implements GroupKey {
+    
+    @Override
+    public String toString() {
+        return asString();
+    }
+    
+    //Enforce hash code and equals in all subclasses
+    @Override
+    public abstract boolean equals(Object other);
+    @Override
+    public abstract int hashCode();
+
+}

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/impl/CompoundGroupKey.java

@@ -0,0 +1,71 @@
+package com.sap.sailing.datamining.impl;
+
+import com.sap.sailing.datamining.shared.GroupKey;
+
+public class CompoundGroupKey extends AbstractGroupKey implements GroupKey {
+
+    private GroupKey mainKey;
+    private GroupKey subKey;
+    
+    public CompoundGroupKey(GroupKey mainKey) {
+        this(mainKey, null);
+    }
+
+    public CompoundGroupKey(GroupKey mainKey, GroupKey subKey) {
+        this.mainKey = mainKey;
+        this.subKey = subKey;
+    }
+
+    @Override
+    public String asString() {
+        return mainKey.asString() + " " + subKey.asString();
+    }
+
+    @Override
+    public boolean hasSubKey() {
+        return subKey != null;
+    }
+
+    @Override
+    public GroupKey getSubKey() {
+        return subKey;
+    }
+    
+    public void setSubKey(GroupKey subKey) {
+        this.subKey = subKey;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((mainKey == null) ? 0 : mainKey.hashCode());
+        result = prime * result + ((subKey == null) ? 0 : subKey.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        CompoundGroupKey other = (CompoundGroupKey) obj;
+        if (mainKey == null) {
+            if (other.mainKey != null)
+                return false;
+        } else if (!mainKey.equals(other.mainKey))
+            return false;
+        if (subKey == null) {
+            if (other.subKey != null)
+                return false;
+        } else if (!subKey.equals(other.subKey))
+            return false;
+        return true;
+    }
+
+    
+
+}

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/impl/DimensionImpl.java

@@ -0,0 +1,44 @@
+package com.sap.sailing.datamining.impl;
+
+import com.sap.sailing.datamining.Dimension;
+import com.sap.sailing.datamining.shared.GroupKey;
+
+public class DimensionImpl extends AbstractGroupKey implements Dimension {
+    
+    private Type type;
+
+    public DimensionImpl(Type type) {
+        this.type = type;
+    }
+
+    @Override
+    public Type getType() {
+        return type;
+    }
+
+    @Override
+    public String asString() {
+        return getType().toString();
+    }
+
+    @Override
+    public boolean hasSubKey() {
+        return false;
+    }
+
+    @Override
+    public GroupKey getSubKey() {
+        return null;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        return type.equals(other);
+    }
+
+    @Override
+    public int hashCode() {
+        return type.hashCode();
+    }
+
+}

java/com.sap.sailing.datamining/src/com/sap/sailing/datamining/shared/GroupKey.java

@@ -1,5 +1,22 @@
 package com.sap.sailing.datamining.shared;
 
+
 public interface GroupKey {
+    
+    /**
+     * @return a string representation of this group key.
+     */
+    public String asString();
+    
+    /**
+     * Checks if this group key has a sub key. For example if the data was grouped primary by competitor and secondary by leg type.
+     * @return true, if this group key has a sub key
+     */
+    public boolean hasSubKey();
+    
+    /**
+     * @return the sub key or null, if there's none.
+     */
+    public GroupKey getSubKey();
 
 }