#919 - io.ebean package initial

src/main/java/io/ebeaninternal/server/el/ElComparatorProperty.java

@@ -0,0 +1,49 @@
+package io.ebeaninternal.server.el;
+
+import java.util.Comparator;
+
+/**
+ * Comparator based on a ElGetValue.
+ */
+public final class ElComparatorProperty<T> implements Comparator<T>, ElComparator<T> {
+
+  private final ElPropertyValue elGetValue;
+
+  private final int nullOrder;
+
+  private final int asc;
+
+  public ElComparatorProperty(ElPropertyValue elGetValue, boolean ascending, boolean nullsHigh) {
+    this.elGetValue = elGetValue;
+    this.asc = ascending ? 1 : -1;
+    this.nullOrder = asc * (nullsHigh ? 1 : -1);
+  }
+
+  public int compare(T o1, T o2) {
+
+    Object val1 = elGetValue.pathGet(o1);
+    Object val2 = elGetValue.pathGet(o2);
+    return compareValues(val1, val2);
+  }
+
+  public int compareValue(Object value, T o2) {
+
+    Object val2 = elGetValue.pathGet(o2);
+    return compareValues(value, val2);
+  }
+
+  @SuppressWarnings({"unchecked", "rawtypes"})
+  public int compareValues(Object val1, Object val2) {
+
+    if (val1 == null) {
+      return val2 == null ? 0 : nullOrder;
+    }
+    if (val2 == null) {
+      return -1 * nullOrder;
+    }
+    Comparable c = (Comparable) val1;
+    return asc * c.compareTo(val2);
+  }
+
+
+}