#919 - io.ebean package initial

src/main/java/io/ebeaninternal/server/expression/Same.java

@@ -0,0 +1,56 @@
+package io.ebeaninternal.server.expression;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * Utility to help isSame methods.
+ */
+public class Same {
+
+  /**
+   * Return true if both values are null or both an not null.
+   */
+  public static boolean sameByNull(Object v1, Object v2) {
+    return v1 == null ? v2 == null : v2 != null;
+  }
+
+  /**
+   * Null safe equals check.
+   */
+  public static boolean sameByValue(Object v1, Object v2) {
+    return v1 == null ? v2 == null : v1.equals(v2);
+  }
+
+  /**
+   * Return true if both collections are the same by value and order is taken into account.
+   */
+  public static boolean sameByValue(Collection<?> v1, Collection<?> v2) {
+    if (v1 == null) {
+      return v2 == null;
+    }
+    if (v2 == null || v1.size() != v2.size()) {
+      return false;
+    }
+    Iterator<?> thisIt = v1.iterator();
+    Iterator<?> thatIt = v2.iterator();
+    while (thisIt.hasNext() && thatIt.hasNext()) {
+      if (!thisIt.next().equals(thatIt.next())) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
+   * Null safe check by sameByValue or sameByNull based on byValue.
+   */
+  public static boolean sameBy(boolean byValue, Object value, Object value1) {
+
+    if (byValue) {
+      return sameByValue(value, value1);
+    } else {
+      return sameByNull(value, value1);
+    }
+  }
+}