Class FilesystemResourceLoader
- java.lang.Object
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- org.apache.lucene.analysis.util.FilesystemResourceLoader
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- All Implemented Interfaces:
ResourceLoader
public final class FilesystemResourceLoader extends java.lang.Object implements ResourceLoader
SimpleResourceLoader
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 aClassLoader
is needed.You can chain several
FilesystemResourceLoader
s to allow lookup of files in more than one base directory.
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Field Summary
Fields Modifier and Type Field Description private java.nio.file.Path
baseDirectory
private ResourceLoader
delegate
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Constructor Summary
Constructors Constructor Description FilesystemResourceLoader(java.nio.file.Path baseDirectory, java.lang.ClassLoader delegate)
Creates a resource loader that resolves resources against the given base directory.FilesystemResourceLoader(java.nio.file.Path baseDirectory, java.lang.Module delegate)
Creates a resource loader that resolves resources against the given base directory.FilesystemResourceLoader(java.nio.file.Path baseDirectory, ResourceLoader delegate)
Creates a resource loader that resolves resources against the given base directory.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <T> java.lang.Class<? extends T>
findClass(java.lang.String cname, java.lang.Class<T> expectedType)
Finds class of the name and expected type<T> T
newInstance(java.lang.String cname, java.lang.Class<T> expectedType)
Creates an instance of the name and expected typejava.io.InputStream
openResource(java.lang.String resource)
Opens a named resource
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Field Detail
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baseDirectory
private final java.nio.file.Path baseDirectory
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delegate
private final ResourceLoader delegate
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Constructor Detail
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FilesystemResourceLoader
public FilesystemResourceLoader(java.nio.file.Path baseDirectory, java.lang.ClassLoader delegate)
Creates a resource loader that resolves resources against the given base directory. Files not found in file system and class lookups are delegated toClassLoader
.To use this constructor with the Java Module System, you must open all modules that contain resources to the
org.apache.lucene.core
module, otherwise resources can't be looked up. It is recommended to useFilesystemResourceLoader(Path, Module)
for such use cases as this would limit to certain modules.
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FilesystemResourceLoader
public FilesystemResourceLoader(java.nio.file.Path baseDirectory, java.lang.Module delegate)
Creates a resource loader that resolves resources against the given base directory. Files not found in file system and class lookups are delegated toModuleResourceLoader
.To use this constructor, you must open the module to the
org.apache.lucene.core
module, otherwise resources can't be looked up.
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FilesystemResourceLoader
public FilesystemResourceLoader(java.nio.file.Path baseDirectory, ResourceLoader delegate)
Creates a resource loader that resolves resources against the given base directory. Files not found in file system and class lookups are delegated to the given delegateResourceLoader
.
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Method Detail
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openResource
public java.io.InputStream openResource(java.lang.String resource) throws java.io.IOException
Description copied from interface:ResourceLoader
Opens a named resource- Specified by:
openResource
in interfaceResourceLoader
- Throws:
java.io.IOException
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newInstance
public <T> T newInstance(java.lang.String cname, java.lang.Class<T> expectedType)
Description copied from interface:ResourceLoader
Creates an instance of the name and expected type- Specified by:
newInstance
in interfaceResourceLoader
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findClass
public <T> java.lang.Class<? extends T> findClass(java.lang.String cname, java.lang.Class<T> expectedType)
Description copied from interface:ResourceLoader
Finds class of the name and expected type- Specified by:
findClass
in interfaceResourceLoader
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