Races lists - Added utility class for "contains data" calculation

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/home/client/place/event/partials/racelist/RaceListDataUtil.java

@@ -0,0 +1,107 @@
+package com.sap.sailing.gwt.home.client.place.event.partials.racelist;
+
+import java.util.Collection;
+
+import com.sap.sailing.gwt.ui.shared.dispatch.event.RaceListRaceDTO;
+import com.sap.sailing.gwt.ui.shared.race.FleetMetadataDTO;
+import com.sap.sailing.gwt.ui.shared.race.RaceMetadataDTO;
+import com.sap.sailing.gwt.ui.shared.race.SimpleWindDTO;
+import com.sap.sse.common.Duration;
+
+public class RaceListDataUtil {
+    
+    private interface ValueProvider<T, V> {
+        V getValue(T object);
+    }
+    
+    private static <T extends RaceMetadataDTO> boolean hasValues(Collection<T> races, ValueProvider<T, ?> valueProvider) {
+        for (T race : races) {
+            if (valueProvider.getValue(race) != null) {
+                return true;
+            }
+        }
+        return false;
+    }
+    
+    private static <T extends RaceMetadataDTO> boolean hasNumberValues(Collection<T> races, ValueProvider<T, Number> valueProvider) {
+        for (T race : races) {
+            Number value = valueProvider.getValue(race);
+            if (value != null && value.longValue() > 0) {
+                return true;
+            }
+        }
+        return false;
+    }
+    
+    public static <T extends RaceMetadataDTO> boolean hasFleets(Collection<T> data) {
+        return hasValues(data, new ValueProvider<T, FleetMetadataDTO>() {
+            @Override
+            public FleetMetadataDTO getValue(T object) {
+                return object.getFleet();
+            }
+        });
+    }
+    
+    public static <T extends RaceListRaceDTO> boolean hasDurations(Collection<T> data) {
+        return hasValues(data, new ValueProvider<T, Duration>() {
+            @Override
+            public Duration getValue(T object) {
+                return object.getDuration();
+            }
+        });
+    }
+    
+    public static <T extends RaceMetadataDTO> boolean hasWind(Collection<T> data) {
+        return hasValues(data, new ValueProvider<T, SimpleWindDTO>() {
+            @Override
+            public SimpleWindDTO getValue(T object) {
+                return object.getWind();
+            }
+        });
+    }
+    
+    public static <T extends RaceListRaceDTO> boolean hasWindFixes(Collection<T> data) {
+        return hasNumberValues(data, new ValueProvider<T, Number>() {
+            @Override
+            public Number getValue(T object) {
+                return object.getWindFixesCount();
+            }
+        });
+    }
+    
+    public static <T extends RaceListRaceDTO> boolean hasVideos(Collection<T> data) {
+        return hasNumberValues(data, new ValueProvider<T, Number>() {
+            @Override
+            public Number getValue(T object) {
+                return object.getVideoCount();
+            }
+        });
+    }
+    
+    public static <T extends RaceListRaceDTO> boolean hasAudios(Collection<T> data) {
+        return hasNumberValues(data, new ValueProvider<T, Number>() {
+            @Override
+            public Number getValue(T object) {
+                return object.getAudioCount();
+            }
+        });
+    }
+    
+    public static <T extends RaceMetadataDTO> boolean hasCourses(Collection<T> data) {
+        return hasValues(data, new ValueProvider<T, String>() {
+            @Override
+            public String getValue(T object) {
+                return object.getCourse();
+            }
+        });
+    }
+    
+    public static <T extends RaceMetadataDTO> boolean hasCourseAreas(Collection<T> data) {
+        return hasValues(data, new ValueProvider<T, String>() {
+            @Override
+            public String getValue(T object) {
+                return object.getCourseArea();
+            }
+        });
+    }
+}