Merge pull request #8 from zalando/issue7

Fix issue 7: equals & hashCode impl for PgArray

Author: valgog

src/main/java/de/zalando/typemapper/postgres/PgArray.java

@@ -1,5 +1,7 @@
 package de.zalando.typemapper.postgres;
 
+import com.google.common.base.Objects;
+
 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.SQLException;
@@ -175,4 +177,19 @@ public void free() throws SQLException {
         throw new SQLFeatureNotSupportedException("Feature not supported");
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(elementTypeName, serializer.collection);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof PgArray) {
+            PgArray other = (PgArray) obj;
+            return Objects.equal(elementTypeName, other.elementTypeName) &&
+                    Objects.equal(serializer.collection, other.serializer.collection);
+        } else {
+            return false;
+        }
+    }
 }

src/test/java/de/zalando/typemapper/postgres/PgArrayTest.java

@@ -0,0 +1,31 @@
+package de.zalando.typemapper.postgres;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+public class PgArrayTest {
+
+    @Test
+    public void testEquals() {
+        PgArray<Short> array1 = PgArray.ARRAY(Arrays.asList((short) 1, (short) 2, (short) 3));
+        PgArray<Short> array2 = PgArray.ARRAY(Arrays.asList((short) 1, (short) 2, (short) 3));
+        assertEquals(array1, array2);
+
+        PgArray<Integer> array3 = PgArray.ARRAY(Arrays.asList(1, 2, 3));
+        assertNotEquals(array1, array3);
+    }
+
+    @Test
+    public void testHashCode() {
+        PgArray<Short> array1 = PgArray.ARRAY(Arrays.asList((short) 1, (short) 2, (short) 3));
+        PgArray<Short> array2 = PgArray.ARRAY(Arrays.asList((short) 1, (short) 2, (short) 3));
+        assertEquals(array1.hashCode(), array2.hashCode());
+
+        PgArray<Integer> array3 = PgArray.ARRAY(Arrays.asList(1, 2, 3));
+        assertNotEquals(array1.hashCode(), array3.hashCode());
+    }
+}