/*
* 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.sql.gen;
import com.facebook.presto.byteCode.Block;
import com.facebook.presto.byteCode.ByteCodeNode;
import com.facebook.presto.byteCode.CompilerContext;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.relational.RowExpression;
import com.facebook.presto.type.UnknownType;
import java.util.List;
import static com.facebook.presto.sql.gen.ByteCodeUtils.generateFunctionCall;
public class CastCodeGenerator
implements ByteCodeGenerator
{
@Override
public ByteCodeNode generateExpression(Signature signature, ByteCodeGeneratorContext generatorContext, Type returnType, List<RowExpression> arguments)
{
RowExpression argument = arguments.get(0);
CompilerContext context = generatorContext.getContext();
if (argument.getType().equals(UnknownType.UNKNOWN)) {
return new Block(context).putVariable("wasNull", true).pushJavaDefault(returnType.getJavaType());
}
FunctionBinding binding = generatorContext
.getBootstrapBinder()
.bindCastOperator(generatorContext.generateGetSession(), generatorContext.generate(argument), argument.getType(), returnType);
return generateFunctionCall(signature, context, binding, "cast");
}
}