Github user jskora commented on a diff in the pull request: https://github.com/apache/nifi/pull/113#discussion_r43755190 --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ListFile.java --- @@ -0,0 +1,378 @@ +/* + * 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 org.apache.nifi.annotation.behavior.TriggerSerially; +import org.apache.nifi.annotation.behavior.TriggerWhenEmpty; +import org.apache.nifi.annotation.behavior.WritesAttribute; +import org.apache.nifi.annotation.behavior.WritesAttributes; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.SeeAlso; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.flowfile.attributes.CoreAttributes; +import org.apache.nifi.processor.DataUnit; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.processors.standard.util.FileInfo; + +import java.io.File; +import java.io.FileFilter; +import java.io.IOException; +import java.nio.file.FileStore; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.nio.file.attribute.BasicFileAttributeView; +import java.nio.file.attribute.BasicFileAttributes; +import java.nio.file.attribute.FileOwnerAttributeView; +import java.nio.file.attribute.PosixFileAttributeView; +import java.nio.file.attribute.PosixFilePermissions; +import java.text.DateFormat; +import java.text.SimpleDateFormat; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Date; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicReference; +import java.util.regex.Pattern; + +@TriggerSerially +@TriggerWhenEmpty +@Tags({"file", "get", "list", "ingest", "source", "filesystem"}) +@CapabilityDescription("Retrieves a listing of files from the local filesystem. For each file that is listed, " + + "creates a FlowFile that represents the file so that it can be fetched in conjunction with ListFile. This " + + "Processor is designed to run on Primary Node only in a cluster. If the primary node changes, the new " + + "Primary Node will pick up where the previous node left off without duplicating all of the data. Unlike " + + "GetFile, this Processor does not delete any data from the local filesystem.") +@WritesAttributes({ + @WritesAttribute(attribute="filename", description="The name of the file that was read from filesystem."), + @WritesAttribute(attribute="path", description="The path is set to the absolute path of the file's directory " + + "on filesystem. For example, if the Directory property is set to /tmp, then files picked up from " + + "/tmp will have the path attribute set to \"./\". If the Recurse Subdirectories property is set to " + + "true and a file is picked up from /tmp/abc/1/2/3, then the path attribute will be set to " + + "\"/tmp/abc/1/2/3\"."), + @WritesAttribute(attribute="fs.owner", description="The user that owns the file in filesystem"), + @WritesAttribute(attribute="fs.group", description="The group that owns the file in filesystem"), + @WritesAttribute(attribute="fs.lastModified", description="The timestamp of when the file in filesystem was " + + "last modified, as milliseconds since midnight Jan 1, 1970 UTC"), + @WritesAttribute(attribute="fs.length", description="The number of bytes in the file in filesystem"), + @WritesAttribute(attribute="fs.permissions", description="The permissions for the file in filesystem. This " + + "is formatted as 3 characters for the owner, 3 for the group, and 3 for other users. For example " + + "rw-rw-r--") +}) +@SeeAlso({GetFile.class, PutFile.class}) +public class ListFile extends AbstractListProcessor<FileInfo> { + + public static final PropertyDescriptor DIRECTORY = new PropertyDescriptor.Builder() + .name("Input Directory") + .description("The input directory from which files to pull files") + .required(true) + .addValidator(StandardValidators.createDirectoryExistsValidator(true, false)) + .expressionLanguageSupported(true) + .build(); + + public static final PropertyDescriptor RECURSE = new PropertyDescriptor.Builder() + .name("Recurse Subdirectories") + .description("Indicates whether to list files from subdirectories of the directory") + .required(true) + .allowableValues("true", "false") + .defaultValue("true") + .build(); + + public static final PropertyDescriptor FILE_FILTER = new PropertyDescriptor.Builder() + .name("File Filter") + .description("Only files whose names match the given regular expression will be picked up") + .required(true) + .defaultValue("[^\\.].*") + .addValidator(StandardValidators.REGULAR_EXPRESSION_VALIDATOR) + .build(); + + public static final PropertyDescriptor PATH_FILTER = new PropertyDescriptor.Builder() + .name("Path Filter") + .description("When " + RECURSE.getName() + " is true, then only subdirectories whose path matches the given regular expression will be scanned") + .required(false) + .addValidator(StandardValidators.REGULAR_EXPRESSION_VALIDATOR) + .build(); + + + public static final PropertyDescriptor MIN_AGE = new PropertyDescriptor.Builder() + .name("Minimum File Age") + .description("The minimum age that a file must be in order to be pulled; any file younger than this amount of time (according to last modification date) will be ignored") + .required(true) + .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR) + .defaultValue("0 sec") + .build(); + + public static final PropertyDescriptor MAX_AGE = new PropertyDescriptor.Builder() + .name("Maximum File Age") + .description("The maximum age that a file must be in order to be pulled; any file older than this amount of time (according to last modification date) will be ignored") + .required(false) + .addValidator(StandardValidators.createTimePeriodValidator(100, TimeUnit.MILLISECONDS, Long.MAX_VALUE, TimeUnit.NANOSECONDS)) + .build(); + + public static final PropertyDescriptor MIN_SIZE = new PropertyDescriptor.Builder() + .name("Minimum File Size") + .description("The minimum size that a file must be in order to be pulled") + .required(true) + .addValidator(StandardValidators.DATA_SIZE_VALIDATOR) + .defaultValue("0 B") + .build(); + + public static final PropertyDescriptor MAX_SIZE = new PropertyDescriptor.Builder() + .name("Maximum File Size") + .description("The maximum size that a file can be in order to be pulled") + .required(false) + .addValidator(StandardValidators.DATA_SIZE_VALIDATOR) + .build(); + + public static final PropertyDescriptor IGNORE_HIDDEN_FILES = new PropertyDescriptor.Builder() + .name("Ignore Hidden Files") + .description("Indicates whether or not hidden files should be ignored") + .allowableValues("true", "false") + .defaultValue("true") + .required(true) + .build(); + + private List<PropertyDescriptor> properties; --- End diff -- That makes sense, but is it necessary for a processor with no dynamic properties?
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