/*
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to you 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 net.hydromatic.optiq.rules.java;
import net.hydromatic.linq4j.expressions.Expression;
import net.hydromatic.linq4j.expressions.Expressions;
import net.hydromatic.linq4j.expressions.NewExpression;
import org.eigenbase.rex.RexCall;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.List;
/**
* Implementation of {@link net.hydromatic.optiq.rules.java
* .NotNullImplementor} that calls given {@link java.lang.reflect.Method}.
* When method is not static, a new instance of the required class is created.
*/
public class ReflectiveCallNotNullImplementor implements NotNullImplementor {
protected final Method method;
/**
* Constructor of {@link ReflectiveCallNotNullImplementor}
* @param method method that is used to implement the call
*/
public ReflectiveCallNotNullImplementor(Method method) {
this.method = method;
}
public Expression implement(RexToLixTranslator translator,
RexCall call, List<Expression> translatedOperands) {
if ((method.getModifiers() & Modifier.STATIC) != 0) {
return Expressions.call(method, translatedOperands);
} else {
// The UDF class must have a public zero-args constructor.
// Assume that the validator checked already.
final NewExpression target =
Expressions.new_(method.getDeclaringClass());
return Expressions.call(target, method, translatedOperands);
}
}
}
// End ReflectiveCallNotNullImplementor.java