org.apache.lucene.analysis.util

## Class FilesystemResourceLoader

- java.lang.Object
- - org.apache.lucene.analysis.util.FilesystemResourceLoader

- All Implemented Interfaces:
    ResourceLoader

      public final class FilesystemResourceLoader
      extends Object
      implements ResourceLoader

  Simple `ResourceLoader` that opens resource files from the local file system, optionally resolving against a base directory.

  This loader wraps a delegate `ResourceLoader` that is used to resolve all files, the current base directory does not contain. `newInstance(java.lang.String, java.lang.Class<T>)` is always resolved against the delegate, as a `ClassLoader` is needed.

  You can chain several `FilesystemResourceLoader`s to allow lookup of files in more than one base directory.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `FilesystemResourceLoader(Path baseDirectory)` Deprecated. You should not use this ctor, because it uses the thread's context class loader as fallback for resource lookups, which is bad programming style. Please specify a `ClassLoader` instead.
    `FilesystemResourceLoader(Path baseDirectory, ClassLoader delegate)` Creates a resource loader that resolves resources against the given base directory (may be `null` to refer to CWD).
    `FilesystemResourceLoader(Path baseDirectory, ResourceLoader delegate)` Creates a resource loader that resolves resources against the given base directory (may be `null` to refer to CWD).

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `<T> Class<? extends T>` | `findClass(String cname, Class<T> expectedType)` Finds class of the name and expected type
    `<T> T` | `newInstance(String cname, Class<T> expectedType)` Creates an instance of the name and expected type
    `InputStream` | `openResource(String resource)` Opens a named resource

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

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

- - ### Constructor Detail

    - #### FilesystemResourceLoader

          @Deprecated
          public FilesystemResourceLoader(Path baseDirectory)

      Deprecated. You should not use this ctor, because it uses the thread's context class loader as fallback for resource lookups, which is bad programming style. Please specify a `ClassLoader` instead.
      Creates a resource loader that resolves resources against the given base directory (may be `null` to refer to CWD). Files not found in file system and class lookups are delegated to context classloader.
      See Also:
        `FilesystemResourceLoader(Path, ClassLoader)`

    - #### FilesystemResourceLoader

          public FilesystemResourceLoader(Path baseDirectory,
                                          ClassLoader delegate)

      Creates a resource loader that resolves resources against the given base directory (may be `null` to refer to CWD). Files not found in file system and class lookups are delegated to context classloader.

    - #### FilesystemResourceLoader

          public FilesystemResourceLoader(Path baseDirectory,
                                          ResourceLoader delegate)

      Creates a resource loader that resolves resources against the given base directory (may be `null` to refer to CWD). Files not found in file system and class lookups are delegated to the given delegate `ResourceLoader`.

  - ### Method Detail

    - #### openResource

          public InputStream openResource(String resource)
                                   throws IOException

      Description copied from interface: `ResourceLoader`
      Opens a named resource
      Specified by:
        `openResource` in interface `ResourceLoader`
      Throws:
        `IOException`

    - #### newInstance

          public <T> T newInstance(String cname,
                                   Class<T> expectedType)

      Description copied from interface: `ResourceLoader`
      Creates an instance of the name and expected type
      Specified by:
        `newInstance` in interface `ResourceLoader`

    - #### findClass

          public <T> Class<? extends T> findClass(String cname,
                                                  Class<T> expectedType)

      Description copied from interface: `ResourceLoader`
      Finds class of the name and expected type
      Specified by:
        `findClass` in interface `ResourceLoader`

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