/*
* 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.control.IfStatement;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.relational.RowExpression;
import com.google.common.base.Preconditions;
import java.util.List;
public class IfCodeGenerator
implements ByteCodeGenerator
{
@Override
public ByteCodeNode generateExpression(Signature signature, ByteCodeGeneratorContext context, Type returnType, List<RowExpression> arguments)
{
Preconditions.checkArgument(arguments.size() == 3);
Block condition = new Block(context.getContext())
.append(context.generate(arguments.get(0)))
.comment("... and condition value was not null")
.getVariable("wasNull")
.invokeStatic(CompilerOperations.class, "not", boolean.class, boolean.class)
.invokeStatic(CompilerOperations.class, "and", boolean.class, boolean.class, boolean.class)
.putVariable("wasNull", false);
return new IfStatement(context.getContext(),
condition,
context.generate(arguments.get(1)),
context.generate(arguments.get(2)));
}
}