//tag::ref-doc[]
= File Source
This application polls a directory and sends new files or their contents to the output channel.
The file source provides the contents of a File as a byte array by default.
However, this can be customized using the --file.supplier.mode option:
* ref Provides a java.io.File reference
* lines Will split files line-by-line and emit a new message for each line
* contents The default. Provides the contents of a file as a byte array
When using `--file.supplier.mode=lines`, you can also provide the additional option `--file.supplier.withMarkers=true`.
If set to true, the underlying FileSplitter will emit additional start-of-file and end-of-file marker messages before and after the actual data.
The payload of these 2 additional marker messages is of type `FileSplitter.FileMarker`. The option withMarkers defaults to false if not explicitly set.
== Options
The **$$file$$** $$source$$ has the following options:
//tag::configuration-properties[]
Properties grouped by prefix:
=== file.consumer
$$markers-json$$:: $$When 'fileMarkers == true', specify if they should be produced as FileSplitter.FileMarker objects or JSON.$$ *($$Boolean$$, default: `$$true$$`)*
$$mode$$:: $$The FileReadingMode to use for file reading sources. Values are 'ref' - The File object, 'lines' - a message per line, or 'contents' - the contents as bytes.$$ *($$FileReadingMode$$, default: `$$<none>$$`, possible values: `ref`,`lines`,`contents`)*
$$with-markers$$:: $$Set to true to emit start of file/end of file marker messages before/after the data. Only valid with FileReadingMode 'lines'.$$ *($$Boolean$$, default: `$$<none>$$`)*
=== file.supplier
$$delay-when-empty$$:: $$Duration of delay when no new files are detected.$$ *($$Duration$$, default: `$$1s$$`)*
$$directory$$:: $$The directory to poll for new files.$$ *($$File$$, default: `$$<none>$$`)*
$$filename-pattern$$:: $$A simple ant pattern to match files.$$ *($$String$$, default: `$$<none>$$`)*
$$filename-regex$$:: $$A regex pattern to match files.$$ *($$Pattern$$, default: `$$<none>$$`)*
$$prevent-duplicates$$:: $$Set to true to include an AcceptOnceFileListFilter which prevents duplicates.$$ *($$Boolean$$, default: `$$true$$`)*
//end::configuration-properties[]
//end::ref-doc[]
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