com.facebook.presto.sql.util.AstUtils Maven / Gradle / Ivy
/*
* 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.util;
import com.facebook.presto.sql.tree.Node;
import com.google.common.collect.TreeTraverser;
import java.util.stream.Stream;
import static com.google.common.collect.Iterables.unmodifiableIterable;
import static java.util.Objects.requireNonNull;
public class AstUtils
{
public static boolean nodeContains(Node node, Node subNode)
{
requireNonNull(node, "node is null");
requireNonNull(subNode, "subNode is null");
return preOrder(node)
.anyMatch(childNode -> childNode == subNode);
}
public static Stream preOrder(Node node)
{
return TreeTraverser.using((Node n) -> unmodifiableIterable(n.getChildren()))
.preOrderTraversal(requireNonNull(node, "node is null"))
.stream();
}
private AstUtils() {}
}