FileChangeMonitor (adams-pom 25.11.0-SNAPSHOT API)

All Known Implementing Classes:

AbstractFileChangeMonitor, AbstractMessageDigestBasedMonitor, FlowFileDigest, LastModified, MessageDigest, MultiMonitor, NoChange, Size
```
public interface FileChangeMonitor
```
Interface for file change monitors.

Author:

FracPete (fracpete at waikato dot ac dot nz)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`File`	`getMonitoredFile()`	Returns the file that is being monitored.
`boolean`	`hasChanged(File file)`	Checks whether the file has changed.
`String`	`initialize(File file)`	Initializes the monitor with the specified file.
`boolean`	`isInitialized(File file)`	Checks whether the monitor has been initialized with the specified file.
`String`	`update(File file)`	Updates the monitor with the specified file.

- Method Detail
  - isInitialized
```
boolean isInitialized(File file)
```
    Checks whether the monitor has been initialized with the specified file.
    
    Parameters:
    
    file - the file to check
    
    Returns:
    
    true if setup for this file
    
    See Also:
    
    initialize(File)
  - initialize
```
String initialize(File file)
```
    Initializes the monitor with the specified file.
    
    Parameters:
    
    file - the file to initialize with
    
    Returns:
    
    null if successful, otherwise error message
  - getMonitoredFile
```
File getMonitoredFile()
```
    Returns the file that is being monitored.
    
    Returns:
    
    the file, null if not initialized
  - hasChanged
```
boolean hasChanged(File file)
```
    Checks whether the file has changed. Must be initialized beforehand.
    
    Parameters:
    
    file - the file to check
    
    Returns:
    
    true if changed
    
    See Also:
    
    isInitialized(File), initialize(File)
  - update
```
String update(File file)
```
    Updates the monitor with the specified file.
    
    Parameters:
    
    file - the file to update with
    
    Returns:
    
    null if successful, otherwise error message