/*
* 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.annotation.UsedByGeneratedCode;
import com.facebook.presto.metadata.BoundVariables;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.metadata.SqlOperator;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.TypeManager;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import java.lang.invoke.MethodHandle;
import static com.facebook.presto.metadata.Signature.typeVariable;
import static com.facebook.presto.spi.function.OperatorType.CAST;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
import static com.facebook.presto.util.Reflection.methodHandle;
public final class CastFromUnknownOperator
extends SqlOperator
{
public static final CastFromUnknownOperator CAST_FROM_UNKNOWN = new CastFromUnknownOperator();
private static final MethodHandle METHOD_HANDLE_LONG = methodHandle(CastFromUnknownOperator.class, "toLong", Void.class);
private static final MethodHandle METHOD_HANDLE_DOUBLE = methodHandle(CastFromUnknownOperator.class, "toDouble", Void.class);
private static final MethodHandle METHOD_HANDLE_BOOLEAN = methodHandle(CastFromUnknownOperator.class, "toBoolean", Void.class);
private static final MethodHandle METHOD_HANDLE_SLICE = methodHandle(CastFromUnknownOperator.class, "toSlice", Void.class);
private static final MethodHandle METHOD_HANDLE_OBJECT = methodHandle(CastFromUnknownOperator.class, "toObject", Void.class);
public CastFromUnknownOperator()
{
super(CAST,
ImmutableList.of(typeVariable("E")),
ImmutableList.of(),
parseTypeSignature("E"),
ImmutableList.of(parseTypeSignature("unknown")));
}
@Override
public ScalarFunctionImplementation specialize(
BoundVariables boundVariables, int arity, TypeManager typeManager,
FunctionRegistry functionRegistry)
{
Type toType = boundVariables.getTypeVariable("E");
MethodHandle methodHandle;
if (toType.getJavaType() == long.class) {
methodHandle = METHOD_HANDLE_LONG;
}
else if (toType.getJavaType() == double.class) {
methodHandle = METHOD_HANDLE_DOUBLE;
}
else if (toType.getJavaType() == boolean.class) {
methodHandle = METHOD_HANDLE_BOOLEAN;
}
else if (toType.getJavaType() == Slice.class) {
methodHandle = METHOD_HANDLE_SLICE;
}
else {
methodHandle = METHOD_HANDLE_OBJECT.asType(METHOD_HANDLE_OBJECT.type().changeReturnType(toType.getJavaType()));
}
return new ScalarFunctionImplementation(true, ImmutableList.of(true), methodHandle, isDeterministic());
}
@UsedByGeneratedCode
public static Long toLong(Void arg)
{
return null;
}
@UsedByGeneratedCode
public static Double toDouble(Void arg)
{
return null;
}
@UsedByGeneratedCode
public static Boolean toBoolean(Void arg)
{
return null;
}
@UsedByGeneratedCode
public static Slice toSlice(Void arg)
{
return null;
}
@UsedByGeneratedCode
public static Object toObject(Void arg)
{
return null;
}
}