Implement equals and hashCode on ranking and partition functions

modules/AppearanceAPI/src/main/java/org/gephi/appearance/FunctionImpl.java

@@ -165,4 +165,38 @@ public class FunctionImpl implements RankingFunction, PartitionFunction, SimpleF
         }
         return super.toString();
     }
+
+    @Override
+    public int hashCode() {
+        int hash = 5;
+        hash = 47 * hash + (this.column != null ? this.column.hashCode() : 0);
+        hash = 47 * hash + (this.transformer != null ? this.transformer.hashCode() : 0);
+        hash = 47 * hash + (this.partition != null ? this.partition.hashCode() : 0);
+        hash = 47 * hash + (this.ranking != null ? this.ranking.hashCode() : 0);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final FunctionImpl other = (FunctionImpl) obj;
+        if (this.column != other.column && (this.column == null || !this.column.equals(other.column))) {
+            return false;
+        }
+        if (this.transformer != other.transformer && (this.transformer == null || !this.transformer.equals(other.transformer))) {
+            return false;
+        }
+        if (this.partition != other.partition && (this.partition == null || !this.partition.equals(other.partition))) {
+            return false;
+        }
+        if (this.ranking != other.ranking && (this.ranking == null || !this.ranking.equals(other.ranking))) {
+            return false;
+        }
+        return true;
+    }
 }

modules/AppearanceAPI/src/main/java/org/gephi/appearance/PartitionImpl.java

@@ -104,4 +104,26 @@ public class PartitionImpl implements Partition {
     public Column getColumn() {
         return column;
     }
+
+    @Override
+    public int hashCode() {
+        int hash = 3;
+        hash = 23 * hash + (this.column != null ? this.column.hashCode() : 0);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final PartitionImpl other = (PartitionImpl) obj;
+        if (this.column != other.column && (this.column == null || !this.column.equals(other.column))) {
+            return false;
+        }
+        return true;
+    }
 }

modules/AppearanceAPI/src/main/java/org/gephi/appearance/RankingImpl.java

@@ -69,7 +69,7 @@ public class RankingImpl implements Ranking {
 
     @Override
     public Number getMaxValue() {
-        return index.getMinValue(column);
+        return index.getMaxValue(column);
     }
 
     @Override
@@ -87,4 +87,26 @@ public class RankingImpl implements Ranking {
         float normalizedValue = (float) (value.doubleValue() - getMinValue().doubleValue()) / (float) (getMaxValue().doubleValue() - getMinValue().doubleValue());
         return interpolator.interpolate(normalizedValue);
     }
+
+    @Override
+    public int hashCode() {
+        int hash = 3;
+        hash = 67 * hash + (this.column != null ? this.column.hashCode() : 0);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final RankingImpl other = (RankingImpl) obj;
+        if (this.column != other.column && (this.column == null || !this.column.equals(other.column))) {
+            return false;
+        }
+        return true;
+    }
 }