/*
* 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.operator.scalar;
import com.facebook.presto.spi.function.Description;
import com.facebook.presto.spi.function.ScalarFunction;
import com.facebook.presto.spi.function.SqlNullable;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.function.TypeParameter;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.spi.type.Type;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import java.nio.ByteBuffer;
@Description("textual representation of expression type")
@ScalarFunction("typeof")
public final class TypeOfFunction
{
private TypeOfFunction() {}
@TypeParameter("T")
@SqlType(StandardTypes.VARCHAR)
public static Slice typeof(
@TypeParameter("T") Type type,
@SqlNullable @SqlType("T") Object value)
{
return Slices.wrappedBuffer(ByteBuffer.wrap(type.getDisplayName().getBytes()));
}
@TypeParameter("T")
@SqlType(StandardTypes.VARCHAR)
public static Slice typeof(
@TypeParameter("T") Type type,
@SqlNullable @SqlType("T") Long value)
{
return typeof(type, (Object) value);
}
@TypeParameter("T")
@SqlType(StandardTypes.VARCHAR)
public static Slice typeof(
@TypeParameter("T") Type type,
@SqlNullable @SqlType("T") Double value)
{
return typeof(type, (Object) value);
}
@TypeParameter("T")
@SqlType(StandardTypes.VARCHAR)
public static Slice typeof(
@TypeParameter("T") Type type,
@SqlNullable @SqlType("T") Boolean value)
{
return typeof(type, (Object) value);
}
@TypeParameter("T")
@SqlType(StandardTypes.VARCHAR)
public static Slice typeof(
@TypeParameter("T") Type type,
@SqlNullable @SqlType("T") Void value)
{
return typeof(type, (Object) value);
}
}