/*
* 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.bytecode.FieldDefinition;
import com.facebook.presto.bytecode.MethodGenerationContext;
import com.facebook.presto.bytecode.Scope;
import com.facebook.presto.bytecode.expression.BytecodeExpression;
import com.facebook.presto.operator.scalar.ScalarFunctionImplementation;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Optional;
import static com.facebook.presto.bytecode.ParameterizedType.type;
import static com.facebook.presto.sql.gen.BytecodeUtils.generateInvocation;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.util.Objects.requireNonNull;
public class InvokeFunctionBytecodeExpression
extends BytecodeExpression
{
public static BytecodeExpression invokeFunction(Scope scope, CachedInstanceBinder cachedInstanceBinder, String name, ScalarFunctionImplementation function, BytecodeExpression... parameters)
{
return invokeFunction(scope, cachedInstanceBinder, name, function, ImmutableList.copyOf(parameters));
}
public static BytecodeExpression invokeFunction(Scope scope, CachedInstanceBinder cachedInstanceBinder, String name, ScalarFunctionImplementation function, List<BytecodeExpression> parameters)
{
requireNonNull(scope, "scope is null");
requireNonNull(function, "function is null");
Binding binding = cachedInstanceBinder.getCallSiteBinder().bind(function.getMethodHandle());
Optional<BytecodeNode> instance = Optional.empty();
if (function.getInstanceFactory().isPresent()) {
FieldDefinition field = cachedInstanceBinder.getCachedInstance(function.getInstanceFactory().get());
instance = Optional.of(scope.getThis().getField(field));
}
return new InvokeFunctionBytecodeExpression(scope, binding, name, function, instance, parameters);
}
private final BytecodeNode invocation;
private final String oneLineDescription;
private InvokeFunctionBytecodeExpression(
Scope scope,
Binding binding,
String name,
ScalarFunctionImplementation function,
Optional<BytecodeNode> instance,
List<BytecodeExpression> parameters)
{
super(type(function.getMethodHandle().type().returnType()));
this.invocation = generateInvocation(scope, name, function, instance, parameters.stream().map(BytecodeNode.class::cast).collect(toImmutableList()), binding);
this.oneLineDescription = name + "(" + Joiner.on(", ").join(parameters) + ")";
}
@Override
public BytecodeNode getBytecode(MethodGenerationContext generationContext)
{
return invocation;
}
@Override
public List<BytecodeNode> getChildNodes()
{
return ImmutableList.of();
}
@Override
protected String formatOneLine()
{
return oneLineDescription;
}
}