add IntegerEnumType

presto-common/src/main/java/com/facebook/presto/common/type/EnumType.java

@@ -0,0 +1,24 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.facebook.presto.common.type;
+
+import java.util.Map;
+
+public interface EnumType<T>
+        extends Type
+{
+    Map<String, T> getEntries();
+
+    Type getValueType();
+}

presto-common/src/main/java/com/facebook/presto/common/type/IntegerEnumType.java

@@ -0,0 +1,66 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.facebook.presto.common.type;
+
+import com.facebook.presto.common.block.Block;
+import com.facebook.presto.common.function.SqlFunctionProperties;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class IntegerEnumType
+        extends AbstractLongType
+        implements EnumType<Long>
+{
+    private final Map<String, Long> entries;
+
+    public IntegerEnumType(String name, Map<String, Long> entries)
+    {
+        super(TypeSignature.parseTypeSignature(name));
+        this.entries = entries;
+    }
+
+    @Override
+    public Map<String, Long> getEntries()
+    {
+        return entries;
+    }
+
+    @Override
+    public Object getObjectValue(SqlFunctionProperties properties, Block block, int position)
+    {
+        if (block.isNull(position)) {
+            return null;
+        }
+
+        return block.getLong(position);
+    }
+
+    @Override
+    public boolean isComparable()
+    {
+        return false;
+    }
+
+    @Override
+    public boolean isOrderable()
+    {
+        return false;
+    }
+
+    @Override
+    public Type getValueType() {
+        return BigintType.BIGINT;
+    }
+}