Added hashcode to domain and changed equals method a bit, added Test (#…

…2412)

This commit is one of many prepare PRs / commits for a bigger PR:
SumStateAlert #2260
By Seperating the big #2260 into smaller commits we would like to make the review easier.

Co-authored-by: Kai Jeschek <[email protected]>

io.openems.backend.metadata.odoo/src/io/openems/backend/metadata/odoo/odoo/Domain.java

@@ -122,16 +122,21 @@ public Domain(Field[] fields, Operator operator, Object value) {
 		this.value = value;
 	}
 
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.field, this.operator, this.value);
+	}
+
 	@Override
 	public boolean equals(Object obj) {
 		if (this == obj) {
 			return true;
-		}
-		if (!Domain.class.isInstance(obj)) {
+		} else if (obj instanceof Domain other) {
+			return Objects.equals(this.field, other.field) //
+					&& Objects.equals(this.operator, other.operator) //
+					&& Objects.equals(this.value, other.value);
+		} else {
 			return false;
 		}
-		var other = (Domain) obj;
-		return Objects.equals(this.field, other.field) && Objects.equals(this.operator, other.operator)
-				&& Objects.equals(this.value, other.value);
 	}
 }

io.openems.backend.metadata.odoo/test/io/openems/backend/metadata/odoo/odoo/DomainTest.java

@@ -2,6 +2,7 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertThrows;
 
 import org.junit.Test;
 
@@ -33,20 +34,31 @@ public boolean isQuery() {
 		}
 	};
 
+	@Test
+	public void testDummy() {
+		assertThrows(UnsupportedOperationException.class, TEST_FIELD::name);
+		assertThrows(UnsupportedOperationException.class, TEST_FIELD::index);
+		assertThrows(UnsupportedOperationException.class, TEST_FIELD::isQuery);
+	}
+
 	@Test
 	public void testConstructor() {
-		final var domain_1 = new Domain(TEST_FIELD, Operator.LIKE, "Lorem ipsum");
+		final var domain1 = new Domain(TEST_FIELD, Operator.LIKE, "Lorem ipsum");
+
+		assertEquals("like", domain1.operator);
+		assertEquals("Lorem ipsum", domain1.value);
+		assertEquals(TEST_FIELD.id(), domain1.field);
 
-		assertEquals("like", domain_1.operator);
-		assertEquals("Lorem ipsum", domain_1.value);
-		assertEquals(TEST_FIELD.id(), domain_1.field);
+		final var domain2 = new Domain(new Field[] { TEST_FIELD, TEST_FIELD }, Operator.EQ, "Lorem ipsum");
+		final var domain3 = new Domain(TEST_FIELD_ID + "." + TEST_FIELD_ID, Operator.EQ, "Lorem ipsum");
 
-		final var domain_3 = new Domain(new Field[] { TEST_FIELD, TEST_FIELD }, Operator.EQ, "Lorem ipsum");
-		final var domain_4 = new Domain(TEST_FIELD_ID + "." + TEST_FIELD_ID, Operator.EQ, "Lorem ipsum");
+		assertNotEquals(domain1, domain3);
+		assertEquals(domain3, domain3);
+		assertEquals(domain2, domain3);
+		assertNotEquals(domain3, null);
+		assertNotEquals(domain3, 1);
 
-		assertEquals(domain_3, domain_3);
-		assertEquals(domain_3, domain_4);
-		assertNotEquals(domain_3, null);
-		assertNotEquals(domain_3, 1);
+		assertEquals(domain3.hashCode(), domain2.hashCode());
+		assertNotEquals(domain1.hashCode(), domain2.hashCode());
 	}
 }