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## org.mule.transport.file
Class ExpressionFilenameParser

    java.lang.Object
      org.mule.transport.file.ExpressionFilenameParser

All Implemented Interfaces:
  MuleContextAware, FilenameParser

    public class ExpressionFilenameParser

extends Object
implements FilenameParser, MuleContextAware

`ExpressionFilenameParser` can use any expression language supported by Mule to construct a file name for the current message. Expressions can be xpath, xquery, ognl, mvel, header, function and more. For more information see http://muledocs.org/v2/Expressions.

For example an xpath expression can be defined to pull a message id out of an xml message and use that as the file name - `#[xpath:/message/header/@id]`

This parser superseeds the (now removed) `org.mule.transport.file.SimpleFilenameParser` which has been kept in Mule 2 for compatibility. The following demonstrates how to achieve the same results when using the `ExpressionFilenameParser` over the `SimpleFilenameParser`

- #[DATE] : #[function:datestamp]
- #[DATE:yy-MM-dd] : #[function:datestamp-yy-MM-dd]
- #[SYSTIME] : #[function:systime]
- #[UUID] : #[function:uuid]
- #[ORIGINALNAME] : #[header:originalFilename]
- #[COUNT] : #[function:count] - note that this is a global counter.
- #[<Message Property Name>] : #[header:<Message Property Name>]

Field Summary
`static String` | `DEFAULT_DATE_FORMAT`
`static String` | `DEFAULT_EXPRESSION`
`protected MuleContext` | `muleContext`

Constructor Summary
`ExpressionFilenameParser()`

Method Summary
`String` | `getFilename(MuleMessage message, String expression)`
`protected String` | `getFilename(MuleMessage message, String expression, TemplateParser parser)`
`void` | `setMuleContext(MuleContext context)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_DATE_FORMAT

    public static final String DEFAULT_DATE_FORMAT

See Also:
  Constant Field Values

### DEFAULT_EXPRESSION

    public static final String DEFAULT_EXPRESSION

### muleContext

    protected MuleContext muleContext

Constructor Detail

### ExpressionFilenameParser

    public ExpressionFilenameParser()

Method Detail

### setMuleContext

    public void setMuleContext(MuleContext context)

  Specified by:
    `setMuleContext` in interface `MuleContextAware`

### getFilename

    public String getFilename(MuleMessage message,
                              String expression)

  Specified by:
    `getFilename` in interface `FilenameParser`

### getFilename

    protected String getFilename(MuleMessage message,
                                 String expression,
                                 TemplateParser parser)

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