[GitHub] nifi pull request #476: NIFI-1942 Processor to validate CSV against user-sup...

[JPercivall <gi...@git.apache.org>]

Github user JPercivall commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/476#discussion_r70715212
  
    --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ValidateCsv.java ---
    @@ -0,0 +1,408 @@
    +/*
    + * 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 java.io.IOException;
    +import java.io.InputStream;
    +import java.io.InputStreamReader;
    +import java.util.ArrayList;
    +import java.util.Arrays;
    +import java.util.Collection;
    +import java.util.Collections;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Set;
    +import java.util.concurrent.atomic.AtomicReference;
    +
    +import org.apache.nifi.annotation.behavior.EventDriven;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
    +import org.apache.nifi.annotation.behavior.SideEffectFree;
    +import org.apache.nifi.annotation.behavior.SupportsBatching;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.ValidationContext;
    +import org.apache.nifi.components.ValidationResult;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.logging.ComponentLog;
    +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.io.InputStreamCallback;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.supercsv.cellprocessor.Optional;
    +import org.supercsv.cellprocessor.ParseBigDecimal;
    +import org.supercsv.cellprocessor.ParseBool;
    +import org.supercsv.cellprocessor.ParseChar;
    +import org.supercsv.cellprocessor.ParseDate;
    +import org.supercsv.cellprocessor.ParseDouble;
    +import org.supercsv.cellprocessor.ParseInt;
    +import org.supercsv.cellprocessor.ParseLong;
    +import org.supercsv.cellprocessor.constraint.DMinMax;
    +import org.supercsv.cellprocessor.constraint.Equals;
    +import org.supercsv.cellprocessor.constraint.ForbidSubStr;
    +import org.supercsv.cellprocessor.constraint.LMinMax;
    +import org.supercsv.cellprocessor.constraint.NotNull;
    +import org.supercsv.cellprocessor.constraint.RequireHashCode;
    +import org.supercsv.cellprocessor.constraint.RequireSubStr;
    +import org.supercsv.cellprocessor.constraint.StrMinMax;
    +import org.supercsv.cellprocessor.constraint.StrNotNullOrEmpty;
    +import org.supercsv.cellprocessor.constraint.StrRegEx;
    +import org.supercsv.cellprocessor.constraint.Strlen;
    +import org.supercsv.cellprocessor.constraint.Unique;
    +import org.supercsv.cellprocessor.constraint.UniqueHashCode;
    +import org.supercsv.cellprocessor.ift.CellProcessor;
    +import org.supercsv.exception.SuperCsvCellProcessorException;
    +import org.supercsv.io.CsvListReader;
    +import org.supercsv.prefs.CsvPreference;
    +
    +@EventDriven
    +@SideEffectFree
    +@SupportsBatching
    +@InputRequirement(Requirement.INPUT_REQUIRED)
    +@Tags({"csv", "schema", "validation"})
    +@CapabilityDescription("Validates the contents of FlowFiles against a user-specified CSV schema")
    --- End diff --
    
    Is there some sort of example CSV schema or other documentation we can point to here? I know nothing about CSV validation and if I was given the task to add/configure this processor I would be completely lost. 


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