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ASF GitHub Bot commented on NIFI-4649: -------------------------------------- Github user mattyb149 commented on a diff in the pull request: https://github.com/apache/nifi/pull/2307#discussion_r154498578 --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/FlattenJson.java --- @@ -0,0 +1,134 @@ +/* + * 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.processors.standard; + +import com.github.wnameless.json.flattener.FlattenMode; +import com.github.wnameless.json.flattener.JsonFlattener; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.ValidationResult; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.processor.AbstractProcessor; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; + +import java.io.ByteArrayOutputStream; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashSet; +import java.util.List; +import java.util.Set; + +@Tags({ "json", "flatten" }) +@CapabilityDescription( + "Provides the user with the ability to take a nested JSON document and flatten it into a simple key/value pair " + + "document. The keys are combined at each level with a user-defined separator that defaults to '.'" +) +public class FlattenJson extends AbstractProcessor { + static final Relationship REL_SUCCESS = new Relationship.Builder() + .description("Successfully flattened files go to this relationship.") + .name("success") + .build(); + static final Relationship REL_FAILURE = new Relationship.Builder() + .description("Files that cannot be flattened go to this relationship.") + .name("failure") + .build(); + static final Relationship REL_ORIGINAL = new Relationship.Builder() + .description("The original files are copied to this relationship; autoterminated by default.") + .autoTerminateDefault(true) + .name("original") + .build(); + + static final PropertyDescriptor SEPARATOR = new PropertyDescriptor.Builder() + .name("flatten-json-separator") + .displayName("Separator") + .defaultValue(".") + .description("The separator character used for joining keys. Must be a JSON-legal character.") + .addValidator((subject, input, context) -> { --- End diff -- I really wish we had a SINGLE_CHAR_VALIDATOR in StandardValidators :) For this case though, perhaps the validator should check to see if the character is JSON-legal? Better to find out before the processor is running. > FlattenJson processor > --------------------- > > Key: NIFI-4649 > URL: https://issues.apache.org/jira/browse/NIFI-4649 > Project: Apache NiFi > Issue Type: New Feature > Reporter: Mike Thomsen > Assignee: Mike Thomsen > > Users have requested a processor that can flatten a JSON record into a simple > key/value pair document no matter how nested it is. -- This message was sent by Atlassian JIRA (v6.4.14#64029)