/**
* 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 org.apache.atlas.gremlin.optimizer;
import org.apache.atlas.gremlin.GremlinExpressionFactory;
import org.apache.atlas.groovy.AbstractFunctionExpression;
import org.apache.atlas.groovy.GroovyExpression;
/**
* Finds order expression in the call hierarchy.
*
*/
public class OrderFinder implements CallHierarchyVisitor {
private boolean hasOrderExpression;
private GremlinExpressionFactory gremlinFactory;
public OrderFinder(GremlinExpressionFactory gremlinFactory) {
this.gremlinFactory = gremlinFactory;
}
@Override
public boolean preVisitFunctionCaller(AbstractFunctionExpression expr) {
return true;
}
@Override
public void visitNonFunctionCaller(GroovyExpression expr) {
}
@Override
public void visitNullCaller() {
}
@Override
public boolean postVisitFunctionCaller(AbstractFunctionExpression functionCall) {
if (gremlinFactory.isOrderExpression(functionCall)) {
hasOrderExpression = true;
return false;
}
return true;
}
public boolean hasOrderExpression() {
return hasOrderExpression;
}
}