org.springframework.scripting.support

## Class ResourceScriptSource

- java.lang.Object
- - org.springframework.scripting.support.ResourceScriptSource

- All Implemented Interfaces:
    ScriptSource

      public class ResourceScriptSource
      extends Object
      implements ScriptSource

  `ScriptSource` implementation based on Spring's `Resource` abstraction. Loads the script text from the underlying Resource's `File` or `InputStream`, and tracks the last-modified timestamp of the file (if possible).
  Since:
    2.0
  Author:
    Rob Harrop, Juergen Hoeller
  See Also:
    `InputStreamSource.getInputStream()`, `Resource.getFile()`, `ResourceLoader`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Log` | `logger` Logger available to subclasses

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ResourceScriptSource(Resource resource)` Create a new ResourceScriptSource for the given resource.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Resource` | `getResource()` Return the `Resource` to load the script from.
    `String` | `getScriptAsString()` Retrieve the current script source text as String.
    `boolean` | `isModified()` Indicate whether the underlying script data has been modified since the last time `ScriptSource.getScriptAsString()` was called.
    `protected long` | `retrieveLastModifiedTime()` Retrieve the current last-modified timestamp of the underlying resource.
    `void` | `setEncoding(String encoding)` Sets the encoding used for reading the script resource.
    `String` | `suggestedClassName()` Determine a class name for the underlying script.
    `String` | `toString()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### logger

          protected final Log logger

      Logger available to subclasses

  - ### Constructor Detail

    - #### ResourceScriptSource

          public ResourceScriptSource(Resource resource)

      Create a new ResourceScriptSource for the given resource.
      Parameters:
        `resource` - the Resource to load the script from

  - ### Method Detail

    - #### getResource

          public final Resource getResource()

      Return the `Resource` to load the script from.

    - #### getScriptAsString

          public String getScriptAsString()
                                   throws IOException

      Description copied from interface: `ScriptSource`
      Retrieve the current script source text as String.
      Specified by:
        `getScriptAsString` in interface `ScriptSource`
      Returns:
        the script text
      Throws:
        `IOException` - if script retrieval failed

    - #### isModified

          public boolean isModified()

      Description copied from interface: `ScriptSource`
      Indicate whether the underlying script data has been modified since the last time `ScriptSource.getScriptAsString()` was called. Returns `true` if the script has not been read yet.
      Specified by:
        `isModified` in interface `ScriptSource`
      Returns:
        whether the script data has been modified

    - #### retrieveLastModifiedTime

          protected long retrieveLastModifiedTime()

      Retrieve the current last-modified timestamp of the underlying resource.
      Returns:
        the current timestamp, or 0 if not determinable

    - #### suggestedClassName

          public String suggestedClassName()

      Description copied from interface: `ScriptSource`
      Determine a class name for the underlying script.
      Specified by:
        `suggestedClassName` in interface `ScriptSource`
      Returns:
        the suggested class name, or `null` if none available

    - #### setEncoding

          public void setEncoding(String encoding)

      Sets the encoding used for reading the script resource. The default value is "UTF-8". A null value, implies the platform default.
      Parameters:
        `encoding` - charset encoding used for reading the script.

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`