- All Superinterfaces:
- AutoCloseable,- Closeable,- Flushable,- OptionChecker
- All Known Subinterfaces:
- StandardJavaFileManager
- All Known Implementing Classes:
- ForwardingJavaFileManager
When constructing new JavaFileObjects, the file manager must determine where to create them. For example, if a file manager manages regular files on a file system, it would most likely have a current/working directory to use as default location when creating or finding files. A number of hints can be provided to a file manager as to where to create files. Any file manager might choose to ignore these hints.
Some methods in this interface use class names. Such class names must be given in the Java Virtual Machine internal form of fully qualified class and interface names. For convenience '.' and '/' are interchangeable. The internal form is defined in chapter four of The Java Virtual Machine Specification.
Discussion: this means that the names "java/lang.package-info", "java/lang/package-info", "java.lang.package-info", are valid and equivalent. Compare to binary name as defined in The Java Language Specification, section 13.1 "The Form of a Binary".
The case of names is significant.  All names should be treated
 as case-sensitive.  For example, some file systems have
 case-insensitive, case-aware file names.  File objects representing
 such files should take care to preserve case by using File.getCanonicalFile() or similar means.  If the system is
 not case-aware, file objects must use other means to preserve case.
 
Relative names: some methods in this interface use relative names. A relative name is a non-null, non-empty sequence of path segments separated by '/'. '.' or '..' are invalid path segments. A valid relative name must match the "path-rootless" rule of RFC 3986, section 3.3. Informally, this should be true:
All methods in this interface might throw a SecurityException.
An object of this interface is not required to support multi-threaded access, that is, be synchronized. However, it must support concurrent access to different file objects created by this object.
Implementation note: a consequence of this requirement is that a trivial implementation of output to a JarOutputStream is not a sufficient implementation. That is, rather than creating a JavaFileObject that returns the JarOutputStream directly, the contents must be cached until closed and then written to the JarOutputStream.
Unless explicitly allowed, all methods in this interface might
 throw a NullPointerException if given a null argument.
- Since:
- 1.6
- External Specifications
- See Also:
- 
Nested Class SummaryNested ClassesModifier and TypeInterfaceDescriptionstatic interfaceInterface for locations of file objects.
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Method SummaryModifier and TypeMethodDescriptionvoidclose()Releases any resources opened by this file manager directly or indirectly.default booleancontains(JavaFileManager.Location location, FileObject fo) Determines whether or not a given file object is "contained in" a specified location.voidflush()Flushes any resources opened for output by this file manager directly or indirectly.getClassLoader(JavaFileManager.Location location) Returns a class loader for loading plug-ins from the given package-oriented location.getFileForInput(JavaFileManager.Location location, String packageName, String relativeName) Returns a file object for input representing the specified relative name in the specified package in the given package-oriented location.getFileForOutput(JavaFileManager.Location location, String packageName, String relativeName, FileObject sibling) Returns a file object for output representing the specified relative name in the specified package in the given location.default FileObjectgetFileForOutputForOriginatingFiles(JavaFileManager.Location location, String packageName, String relativeName, FileObject... originatingFiles) Returns a file object for output representing the specified relative name in the specified package in the given location.getJavaFileForInput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind) Returns a file object for input representing the specified class of the specified kind in the given package-oriented location.getJavaFileForOutput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject sibling) Returns a file object for output representing the specified class of the specified kind in the given package-oriented location.default JavaFileObjectgetJavaFileForOutputForOriginatingFiles(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject... originatingFiles) Returns a file object for output representing the specified class of the specified kind in the given package-oriented location.default JavaFileManager.LocationgetLocationForModule(JavaFileManager.Location location, String moduleName) Gets a location for a named module within a location, which may be either a module-oriented location or an output location.default JavaFileManager.LocationgetLocationForModule(JavaFileManager.Location location, JavaFileObject fo) Gets a location for the module containing a specific file to be found within a location, which may be either a module-oriented location or an output location.default <S> ServiceLoader<S> getServiceLoader(JavaFileManager.Location location, Class<S> service) Get a service loader for a specific service class from a given location.booleanhandleOption(String current, Iterator<String> remaining) Handles one option.booleanhasLocation(JavaFileManager.Location location) Determines if a location is known to this file manager.inferBinaryName(JavaFileManager.Location location, JavaFileObject file) Infers a binary name of a file object based on a package-oriented location.default StringinferModuleName(JavaFileManager.Location location) Infer the name of the module from its location, as returned bygetLocationForModuleorlistModuleLocations.booleanisSameFile(FileObject a, FileObject b) Compares two file objects and return true if they represent the same underlying object.list(JavaFileManager.Location location, String packageName, Set<JavaFileObject.Kind> kinds, boolean recurse) Lists all file objects matching the given criteria in the given package-oriented location.default Iterable<Set<JavaFileManager.Location>> Lists the locations for all the modules in a module-oriented location or an output location.Methods declared in interface javax.tools.OptionCheckerisSupportedOption
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Method Details- 
getClassLoaderReturns a class loader for loading plug-ins from the given package-oriented location. For example, to load annotation processors, a compiler will request a class loader for theANNOTATION_PROCESSOR_PATHlocation.- Parameters:
- location- a location
- Returns:
- a class loader for the given location; or nullif loading plug-ins from the given location is disabled or if the location is not known
- Throws:
- SecurityException- if a class loader can not be created in the current security context
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
- IllegalArgumentException- if the location is a module-oriented location
 
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listIterable<JavaFileObject> list(JavaFileManager.Location location, String packageName, Set<JavaFileObject.Kind> kinds, boolean recurse) throws IOException Lists all file objects matching the given criteria in the given package-oriented location. List file objects in "subpackages" if recurse is true.Note: even if the given location is unknown to this file manager, it may not return null. Also, an unknown location may not cause an exception.- Parameters:
- location- a location
- packageName- a package name
- kinds- return objects only of these kinds
- recurse- if true include "subpackages"
- Returns:
- an Iterable of file objects matching the given criteria
- Throws:
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalArgumentException- if the location is a module-oriented location
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
 
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inferBinaryNameInfers a binary name of a file object based on a package-oriented location. The binary name returned might not be a valid binary name according to The Java Language Specification.- Parameters:
- location- a location
- file- a file object
- Returns:
- a binary name or nullthe file object is not found in the given location
- Throws:
- IllegalArgumentException- if the location is a module-oriented location
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
 
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isSameFileCompares two file objects and return true if they represent the same underlying object.- Parameters:
- a- a file object
- b- a file object
- Returns:
- true if the given file objects represent the same underlying object
- Throws:
- IllegalArgumentException- if either of the arguments were created with another file manager and this file manager does not support foreign file objects
 
- 
handleOptionHandles one option. Ifcurrentis an option to this file manager it will consume any arguments to that option fromremainingand return true, otherwise return false.- Parameters:
- current- current option
- remaining- remaining options
- Returns:
- true if this option was handled by this file manager, false otherwise
- Throws:
- IllegalArgumentException- if this option to this file manager is used incorrectly
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
 
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hasLocationDetermines if a location is known to this file manager.- Parameters:
- location- a location
- Returns:
- true if the location is known
 
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getJavaFileForInputJavaFileObject getJavaFileForInput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind) throws IOException Returns a file object for input representing the specified class of the specified kind in the given package-oriented location.- Parameters:
- location- a location
- className- the name of a class
- kind- the kind of file, must be one of- SOURCEor- CLASS
- Returns:
- a file object, might return nullif the file does not exist
- Throws:
- IllegalArgumentException- if the location is not known to this file manager and the file manager does not support unknown locations, or if the kind is not valid, or if the location is a module-oriented location
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
 
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getJavaFileForOutputJavaFileObject getJavaFileForOutput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException Returns a file object for output representing the specified class of the specified kind in the given package-oriented location.Optionally, this file manager might consider the sibling as a hint for where to place the output. The exact semantics of this hint is unspecified. The JDK compiler, javac, for example, will place class files in the same directories as originating source files unless a class file output directory is provided. To facilitate this behavior, javac might provide the originating source file as sibling when calling this method. - Parameters:
- location- a package-oriented location
- className- the name of a class
- kind- the kind of file, must be one of- SOURCEor- CLASS
- sibling- a file object to be used as hint for placement; might be- null
- Returns:
- a file object for output
- Throws:
- IllegalArgumentException- if sibling is not known to this file manager, or if the location is not known to this file manager and the file manager does not support unknown locations, or if the kind is not valid, or if the location is not an output location
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalStateException-- close()has been called and this file manager cannot be reopened
 
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getJavaFileForOutputForOriginatingFilesdefault JavaFileObject getJavaFileForOutputForOriginatingFiles(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject... originatingFiles) throws IOException Returns a file object for output representing the specified class of the specified kind in the given package-oriented location.The provided originatingFilesrepresent files that were, in an unspecified way, used to create the content of the file created by this method. SeeoriginatingElementsinFiler.createSourceFile(java.lang.CharSequence, javax.lang.model.element.Element...).Elements.getFileObjectOf(javax.lang.model.element.Element)may be used to convert theElements toFileObjects.- Implementation Requirements:
- The default implementation calls
 getJavaFileForOutput(javax.tools.JavaFileManager.Location, java.lang.String, javax.tools.JavaFileObject.Kind, javax.tools.FileObject)with the first element of theoriginatingFiles, if any, as asibling.
- Parameters:
- location- a package-oriented location
- className- the name of a class
- kind- the kind of file, must be one of- SOURCEor- CLASS
- originatingFiles- the files which are contributing to this newly created file;- nullis equivalent to empty- originatingFiles, meaning no known originating files
- Returns:
- a file object for output
- Throws:
- IllegalArgumentException- if sibling is not known to this file manager, or if the location is not known to this file manager and the file manager does not support unknown locations, or if the kind is not valid, or if the location is not an output location
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalStateException-- close()has been called and this file manager cannot be reopened
- Since:
- 18
- See Also:
 
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getFileForInputFileObject getFileForInput(JavaFileManager.Location location, String packageName, String relativeName) throws IOException Returns a file object for input representing the specified relative name in the specified package in the given package-oriented location.If the returned object represents a source or class file, it must be an instance of JavaFileObject.Informally, the file object returned by this method is located in the concatenation of the location, package name, and relative name. For example, to locate the properties file "resources/compiler.properties" in the package "com.sun.tools.javac" in the SOURCE_PATH location, this method might be called like so: getFileForInput(SOURCE_PATH, "com.sun.tools.javac", "resources/compiler.properties");If the call was executed on Windows, with SOURCE_PATH set to "C:\Documents and Settings\UncleBob\src\share\classes", a valid result would be a file object representing the file"C:\Documents and Settings\UncleBob\src\share\classes\com\sun\tools\javac\resources\compiler.properties".- Parameters:
- location- a package-oriented location
- packageName- a package name
- relativeName- a relative name
- Returns:
- a file object, might return nullif the file does not exist
- Throws:
- IllegalArgumentException- if the location is not known to this file manager and the file manager does not support unknown locations, or if- relativeNameis not valid, or if the location is a module-oriented location
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
 
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getFileForOutputFileObject getFileForOutput(JavaFileManager.Location location, String packageName, String relativeName, FileObject sibling) throws IOException Returns a file object for output representing the specified relative name in the specified package in the given location.Optionally, this file manager might consider the sibling as a hint for where to place the output. The exact semantics of this hint is unspecified. The JDK compiler, javac, for example, will place class files in the same directories as originating source files unless a class file output directory is provided. To facilitate this behavior, javac might provide the originating source file as sibling when calling this method. If the returned object represents a source or class file, it must be an instance of JavaFileObject.Informally, the file object returned by this method is located in the concatenation of the location, package name, and relative name or next to the sibling argument. See getFileForInputfor an example.- Parameters:
- location- an output location
- packageName- a package name
- relativeName- a relative name
- sibling- a file object to be used as hint for placement; might be- null
- Returns:
- a file object
- Throws:
- IllegalArgumentException- if sibling is not known to this file manager, or if the location is not known to this file manager and the file manager does not support unknown locations, or if- relativeNameis not valid, or if the location is not an output location
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
 
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getFileForOutputForOriginatingFilesdefault FileObject getFileForOutputForOriginatingFiles(JavaFileManager.Location location, String packageName, String relativeName, FileObject... originatingFiles) throws IOException Returns a file object for output representing the specified relative name in the specified package in the given location.The provided originatingFilesrepresent files that were, in an unspecified way, used to create the content of the file created by this method. SeeoriginatingElementsinFiler.createResource(javax.tools.JavaFileManager.Location, java.lang.CharSequence, java.lang.CharSequence, javax.lang.model.element.Element...).Elements.getFileObjectOf(javax.lang.model.element.Element)may be used to convert theElements toFileObjects.If the returned object represents a source or class file, it must be an instance of JavaFileObject.Informally, the file object returned by this method is located in the concatenation of the location, package name, and relative name or in a location inferred from the originatingFiles. SeegetFileForInputfor an example.- Implementation Requirements:
- The default implementation calls
 getFileForOutput(javax.tools.JavaFileManager.Location, java.lang.String, java.lang.String, javax.tools.FileObject)with the first element of theoriginatingFiles, if any, as asibling.
- Parameters:
- location- an output location
- packageName- a package name
- relativeName- a relative name
- originatingFiles- the files which are contributing to this newly created file;- nullis equivalent to empty- originatingFiles, meaning no known originating files
- Returns:
- a file object
- Throws:
- IllegalArgumentException- if sibling is not known to this file manager, or if the location is not known to this file manager and the file manager does not support unknown locations, or if- relativeNameis not valid, or if the location is not an output location
- IOException- if an I/O error occurred, or if- close()has been called and this file manager cannot be reopened
- IllegalStateException- if- close()has been called and this file manager cannot be reopened
- Since:
- 18
- See Also:
 
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flushFlushes any resources opened for output by this file manager directly or indirectly. Flushing a closed file manager has no effect.- Specified by:
- flushin interface- Flushable
- Throws:
- IOException- if an I/O error occurred
- See Also:
 
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closeReleases any resources opened by this file manager directly or indirectly. This might render this file manager useless and the effect of subsequent calls to methods on this object or any objects obtained through this object is undefined unless explicitly allowed. However, closing a file manager which has already been closed has no effect.- Specified by:
- closein interface- AutoCloseable
- Specified by:
- closein interface- Closeable
- Throws:
- IOException- if an I/O error occurred
- See Also:
 
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getLocationForModuledefault JavaFileManager.Location getLocationForModule(JavaFileManager.Location location, String moduleName) throws IOException Gets a location for a named module within a location, which may be either a module-oriented location or an output location. The result will be an output location if the given location is an output location, or it will be a package-oriented location.- Implementation Requirements:
- This implementation throws UnsupportedOperationException.
- Parameters:
- location- the module-oriented location
- moduleName- the name of the module to be found
- Returns:
- the location for the named module
- Throws:
- IOException- if an I/O error occurred
- UnsupportedOperationException- if this operation is not supported by this file manager
- IllegalArgumentException- if the location is neither an output location nor a module-oriented location
- Since:
- 9
 
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getLocationForModuledefault JavaFileManager.Location getLocationForModule(JavaFileManager.Location location, JavaFileObject fo) throws IOException Gets a location for the module containing a specific file to be found within a location, which may be either a module-oriented location or an output location. The result will be an output location if the given location is an output location, or it will be a package-oriented location.- Implementation Requirements:
- This implementation throws UnsupportedOperationException.
- Parameters:
- location- the module-oriented location
- fo- the file
- Returns:
- the module containing the file
- Throws:
- IOException- if an I/O error occurred
- UnsupportedOperationException- if this operation is not supported by this file manager
- IllegalArgumentException- if the location is neither an output location nor a module-oriented location
- Since:
- 9
 
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getServiceLoaderdefault <S> ServiceLoader<S> getServiceLoader(JavaFileManager.Location location, Class<S> service) throws IOException Get a service loader for a specific service class from a given location. If the location is a module-oriented location, the service loader will use the service declarations in the modules found in that location. Otherwise, a service loader is created using the package-oriented location, in which case, the services are determined using the provider-configuration files inMETA-INF/services.- Implementation Requirements:
- This implementation throws UnsupportedOperationException.
- Type Parameters:
- S- the service class
- Parameters:
- location- the module-oriented location
- service- the- Classobject of the service class
- Returns:
- a service loader for the given service class
- Throws:
- IOException- if an I/O error occurred
- UnsupportedOperationException- if this operation is not supported by this file manager
- Since:
- 9
 
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inferModuleNameInfer the name of the module from its location, as returned bygetLocationForModuleorlistModuleLocations.- Implementation Requirements:
- This implementation throws UnsupportedOperationException.
- Parameters:
- location- a package-oriented location representing a module
- Returns:
- the name of the module
- Throws:
- IOException- if an I/O error occurred
- UnsupportedOperationException- if this operation is not supported by this file manager
- IllegalArgumentException- if the location is not one known to this file manager
- Since:
- 9
 
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listLocationsForModulesdefault Iterable<Set<JavaFileManager.Location>> listLocationsForModules(JavaFileManager.Location location) throws IOException Lists the locations for all the modules in a module-oriented location or an output location. The locations that are returned will be output locations if the given location is an output, or it will be a package-oriented locations.- Implementation Requirements:
- This implementation throws UnsupportedOperationException.
- Parameters:
- location- the module-oriented location for which to list the modules
- Returns:
- a series of sets of locations containing modules
- Throws:
- IOException- if an I/O error occurred
- UnsupportedOperationException- if this operation is not supported by this file manager
- IllegalArgumentException- if the location is not a module-oriented location
- Since:
- 9
 
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containsDetermines whether or not a given file object is "contained in" a specified location.For a package-oriented location, a file object is contained in the location if there exist values for packageName and relativeName such that either of the following calls would return the samefile object:getFileForInput(location, packageName, relativeName) getFileForOutput(location, packageName, relativeName, null)For a module-oriented location, a file object is contained in the location if there exists a module that may be obtained by the call: such that the file object is contained in the (package-oriented) location for that module.getLocationForModule(location, moduleName)- Implementation Requirements:
- This implementation throws UnsupportedOperationException.
- Parameters:
- location- the location
- fo- the file object
- Returns:
- whether or not the file is contained in the location
- Throws:
- IOException- if there is a problem determining the result
- UnsupportedOperationException- if the method is not supported
- Since:
- 9
 
 
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