Github user pvillard31 commented on a diff in the pull request: https://github.com/apache/nifi/pull/2147#discussion_r138817250 --- Diff: nifi-commons/nifi-record-path/src/main/java/org/apache/nifi/record/path/paths/WildcardDescendantPath.java --- @@ -0,0 +1,74 @@ +/* + * 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.nifi.record.path.paths; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.stream.Stream; + +import org.apache.nifi.record.path.FieldValue; +import org.apache.nifi.record.path.RecordPathEvaluationContext; +import org.apache.nifi.record.path.StandardFieldValue; +import org.apache.nifi.record.path.util.Filters; +import org.apache.nifi.serialization.record.Record; +import org.apache.nifi.serialization.record.RecordField; + +public class WildcardDescendantPath extends RecordPathSegment { + + WildcardDescendantPath(final RecordPathSegment parent, final boolean absolute) { + super("/*", parent, absolute); + } + + @Override + public Stream<FieldValue> evaluate(final RecordPathEvaluationContext context) { + final Stream<FieldValue> parentResult = getParentPath().evaluate(context); + + return parentResult + .flatMap(recordFieldVal -> findDescendants(recordFieldVal).stream()); + } + + private List<FieldValue> findDescendants(final FieldValue fieldValue) { + if (fieldValue == null || fieldValue.getValue() == null) { + return Collections.emptyList(); + } + if (!Filters.isRecord(fieldValue)) { + return Collections.emptyList(); + } + + final Record record = (Record) fieldValue.getValue(); --- End diff -- Right!
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