/*
* 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.byteCode.control.TryCatch;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.relational.RowExpression;
import java.util.List;
import static com.facebook.presto.byteCode.ParameterizedType.type;
public class TryCastCodeGenerator
implements ByteCodeGenerator
{
@Override
public ByteCodeNode generateExpression(Signature signature, ByteCodeGeneratorContext generatorContext, Type returnType, List<RowExpression> arguments)
{
ByteCodeNode castByteCode = new CastCodeGenerator().generateExpression(signature, generatorContext, returnType, arguments);
CompilerContext context = generatorContext.getContext();
Block catchBlock = new Block(context)
.comment("propagate InterruptedException")
.invokeStatic(CompilerOperations.class, "propagateInterruptedException", void.class, Throwable.class)
.comment("wasNull = true;")
.putVariable("wasNull", true)
.comment("restore stack after exception")
.getVariable("output")
.comment("return dummy value for null")
.pushJavaDefault(returnType.getJavaType());
return new TryCatch(context, "TRY_CAST", castByteCode, catchBlock, type(Exception.class));
}
}