Fixes tarantool#31

Adds Iterator enum with values copied from Tarantool sources;
Adds overloaded select method that accepts Iterator instead of int;
Adds tests on JUnit5 and Mockito.

Author: Alexander Krasnoschekov

pom.xml

@@ -52,6 +52,18 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-all</artifactId>
+            <version>1.9.5</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <parent>

src/main/java/org/tarantool/AbstractTarantoolOps.java

@@ -6,6 +6,10 @@ public abstract class AbstractTarantoolOps<Space, Tuple, Operation, Result> impl
 
     public abstract Result exec(Code code, Object... args);
 
+    public Result select(Space space, Space index, Tuple key, int offset, int limit, Iterator iterator) {
+        return exec(Code.SELECT, Key.SPACE, space, Key.INDEX, index, Key.KEY, key, Key.ITERATOR, iterator.ordinal(), Key.LIMIT, limit, Key.OFFSET, offset);
+    }
+
     public Result select(Space space, Space index, Tuple key, int offset, int limit, int iterator) {
         return exec(Code.SELECT, Key.SPACE, space, Key.INDEX, index, Key.KEY, key, Key.ITERATOR, iterator, Key.LIMIT, limit, Key.OFFSET, offset);
     }

src/main/java/org/tarantool/Iterator.java

@@ -0,0 +1,17 @@
+package org.tarantool;
+
+// Iterator info was taken from here https://github.com/tarantool/tarantool/blob/f66584c3bcdffe61d6d99a4868a9b72d62338a11/src/box/iterator_type.h#L62
+public enum Iterator {
+    EQ, // key == x ASC order
+    REQ, // key == x DESC order
+    ALL, // all tuples
+    LT, // key <  x
+    LE, // key <= x
+    GE, // key >= x
+    GT, // key >  x
+    BITS_ALL_SET, // all bits from x are set in key
+    BITS_ANY_SET, // at least one x's bit is set
+    BITS_ALL_NOT_SET, // all bits are not set
+    OVERLAPS, // key overlaps x
+    NEIGHBOR // tuples in distance ascending order from specified point
+}

src/main/java/org/tarantool/TarantoolClientOps.java

@@ -4,6 +4,8 @@
 public interface TarantoolClientOps<T,O,P,R> {
     R select(T space, T index, O key, int offset, int limit, int iterator);
 
+    R select(T space, T index, O key, int offset, int limit, Iterator iterator);
+
     R insert(T space, O tuple);
 
     R replace(T space, O tuple);

src/test/java/org/tarantool/IteratorTest.java

@@ -0,0 +1,46 @@
+package org.tarantool;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.*;
+
+
+class IteratorTest {
+    protected class MockOps extends AbstractTarantoolOps<Integer, List<?>, Object, List<?>> {
+
+        @Override
+        public List exec(Code code, Object... args) {
+            return null;
+        }
+
+        @Override
+        public void close() {
+            throw new UnsupportedOperationException();
+        }
+    }
+
+    @Test
+    void testSelectWithIteratorInsteadOfInteger() {
+        final int iteratorNumber = 0;
+
+        assertEquals(Iterator.EQ.ordinal(), iteratorNumber);
+
+        MockOps ops = new MockOps();
+        MockOps spyOps = spy(ops);
+        spyOps.select(1,1,new ArrayList<Integer>(),0,1,Iterator.EQ);
+
+        verify(spyOps, times(1)).exec(
+                Code.SELECT,
+                Key.SPACE,1,
+                Key.INDEX,1,
+                Key.KEY, new ArrayList<Integer>(),
+                Key.ITERATOR,iteratorNumber,
+                Key.LIMIT,1,
+                Key.OFFSET,0
+        );
+    }
+}