Github user kchilton2 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/240#discussion_r143872059
--- Diff:
extras/rya.pcj.fluo/pcj.fluo.app/src/main/java/org/apache/rya/indexing/pcj/fluo/app/util/StopNodeVisitor.java
---
@@ -0,0 +1,54 @@
+/*
+ * 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.rya.indexing.pcj.fluo.app.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import org.apache.rya.indexing.pcj.fluo.app.query.FluoQuery;
+import org.apache.rya.indexing.pcj.fluo.app.query.QueryBuilderVisitorBase;
+
+/**
+ * Base class that enables all visitors extending this class to stop
traversing
+ * the Builder tree at a prescribed node. Any visitor extending this
class will
+ * traverse the visitor tree and process all nodes up to and including
the prescribed stop
+ * node.
+ */
+public abstract class StopNodeVisitor extends QueryBuilderVisitorBase {
+
+ private String stopNodeId;
+ private boolean processedStopNode = false;
+
+ public StopNodeVisitor(FluoQuery.Builder fluoBuilder,String nodeId) {
+ super(fluoBuilder);
+ this.stopNodeId = checkNotNull(nodeId);
+ }
+
+ @Override
+ public void visitNode(String nodeId) {
+ //process the stop node, then stop traversing
+ if(!processedStopNode) {
+ processedStopNode = atStopNode(nodeId);
+ super.visitNode(nodeId);
+ }
+ }
+
+ boolean atStopNode(String nodeId) {
--- End diff --
docs
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