/*
* 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.ByteCodeNode;
import com.facebook.presto.metadata.FunctionInfo;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.relational.RowExpression;
import com.facebook.presto.sql.tree.QualifiedName;
import com.google.common.base.Preconditions;
import java.util.ArrayList;
import java.util.List;
public class FunctionCallCodeGenerator
implements ByteCodeGenerator
{
@Override
public ByteCodeNode generateExpression(Signature signature, ByteCodeGeneratorContext context, Type returnType, List<RowExpression> arguments)
{
FunctionRegistry registry = context.getRegistry();
FunctionInfo function = registry.getExactFunction(signature);
if (function == null) {
// TODO: temporary hack to deal with magic timestamp literal functions which don't have an "exact" form and need to be "resolved"
function = registry.resolveFunction(QualifiedName.of(signature.getName()), signature.getArgumentTypes(), false);
}
Preconditions.checkArgument(function != null, "Function %s not found", signature);
List<ByteCodeNode> argumentsByteCode = new ArrayList<>();
for (RowExpression argument : arguments) {
argumentsByteCode.add(context.generate(argument));
}
return context.generateCall(function, argumentsByteCode);
}
}