Module java.compiler

Package javax.tools

Class ForwardingJavaFileManager<M extends JavaFileManager>

java.lang.Object

javax.tools.ForwardingJavaFileManager<M>

Type Parameters:

M - the kind of file manager forwarded to by this object

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable, JavaFileManager, OptionChecker

public class ForwardingJavaFileManager<M extends JavaFileManager>
extends Object
implements JavaFileManager

Forwards calls to a given file manager. Subclasses of this class might override some of these methods and might also provide additional fields and methods.

Unless stated otherwise, references in this class to "this file manager" should be interpreted as referring indirectly to the delegate file manager.

Since:

1.6

Nested Class Summary

Nested classes/interfaces declared in interface javax.tools.JavaFileManager

JavaFileManager.Location

Field Summary

Fields

Modifier and Type	Field	Description
protected final M	fileManager	The file manager to which all methods are delegated.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ForwardingJavaFileManager(M fileManager)	Creates a new instance of ForwardingJavaFileManager.

Method Summary

Modifier and Type	Method	Description
void	close()	Releases any resources opened by this file manager directly or indirectly.
boolean	contains(JavaFileManager.Location location, FileObject fo)	Determines whether or not a given file object is "contained in" a specified location.
void	flush()	Flushes any resources opened for output by this file manager directly or indirectly.
ClassLoader	getClassLoader(JavaFileManager.Location location)	Returns a class loader for loading plug-ins from the given package-oriented location.
FileObject	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.
FileObject	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.
FileObject	getFileForOutputForOriginatingFiles(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.
JavaFileObject	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.
JavaFileObject	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.
JavaFileObject	getJavaFileForOutputForOriginatingFiles(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.
JavaFileManager.Location	getLocationForModule(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.
JavaFileManager.Location	getLocationForModule(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.
<S> ServiceLoader<S>	getServiceLoader(JavaFileManager.Location location, Class<S> service)	Get a service loader for a specific service class from a given location.
boolean	handleOption(String current, Iterator<String> remaining)	Handles one option.
boolean	hasLocation(JavaFileManager.Location location)	Determines if a location is known to this file manager.
String	inferBinaryName(JavaFileManager.Location location, JavaFileObject file)	Infers a binary name of a file object based on a package-oriented location.
String	inferModuleName(JavaFileManager.Location location)	Infer the name of the module from its location, as returned by getLocationForModule or listModuleLocations.
boolean	isSameFile(FileObject a, FileObject b)	Compares two file objects and return true if they represent the same underlying object.
int	isSupportedOption(String option)	Determines if the given option is supported and if so, the number of arguments the option takes.
Iterable<JavaFileObject>	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.
Iterable<Set<JavaFileManager.Location>>	listLocationsForModules(JavaFileManager.Location location)	Lists the locations for all the modules in a module-oriented location or an output location.

Methods declared in class java.lang.Object

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

Field Details

fileManager

protected final M extends JavaFileManager fileManager

The file manager to which all methods are delegated.

Constructor Details

ForwardingJavaFileManager

protected ForwardingJavaFileManager(M fileManager)

Creates a new instance of ForwardingJavaFileManager.

Parameters:

fileManager - delegate to this file manager

Method Details

getClassLoader

public ClassLoader getClassLoader(JavaFileManager.Location location)

Description copied from interface: JavaFileManager

Returns 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 the ANNOTATION_PROCESSOR_PATH location.

Specified by:

getClassLoader in interface JavaFileManager

Parameters:

location - a location

Returns:

a class loader for the given location; or null if 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 JavaFileManager.close() has been called and this file manager cannot be reopened

list

public Iterable<JavaFileObject> list(JavaFileManager.Location location,
 String packageName,
 Set<JavaFileObject.Kind> kinds,
 boolean recurse)
                              throws IOException

Description copied from interface: JavaFileManager

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.

Specified by:

list in interface JavaFileManager

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 JavaFileManager.close() has been called and this file manager cannot be reopened

IllegalStateException - if JavaFileManager.close() has been called and this file manager cannot be reopened

inferBinaryName

public String inferBinaryName(JavaFileManager.Location location,
 JavaFileObject file)

Description copied from interface: JavaFileManager

Infers 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.

Specified by:

inferBinaryName in interface JavaFileManager

Parameters:

location - a location

file - a file object

Returns:

a binary name or null the file object is not found in the given location

Throws:

IllegalStateException - if JavaFileManager.close() has been called and this file manager cannot be reopened

isSameFile

public boolean isSameFile(FileObject a,
 FileObject b)

Description copied from interface: JavaFileManager

Compares two file objects and return true if they represent the same underlying object.

Specified by:

isSameFile in interface JavaFileManager

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

handleOption

public boolean handleOption(String current,
 Iterator<String> remaining)

Description copied from interface: JavaFileManager

Handles one option. If current is an option to this file manager it will consume any arguments to that option from remaining and return true, otherwise return false.

Specified by:

handleOption in interface JavaFileManager

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 JavaFileManager.close() has been called and this file manager cannot be reopened

hasLocation

public boolean hasLocation(JavaFileManager.Location location)

Description copied from interface: JavaFileManager

Determines if a location is known to this file manager.

Specified by:

hasLocation in interface JavaFileManager

Parameters:

location - a location

Returns:

true if the location is known

isSupportedOption

public int isSupportedOption(String option)

Description copied from interface: OptionChecker

Determines if the given option is supported and if so, the number of arguments the option takes.

Specified by:

isSupportedOption in interface OptionChecker

Parameters:

option - an option

Returns:

the number of arguments the given option takes or -1 if the option is not supported

getJavaFileForInput

public JavaFileObject getJavaFileForInput(JavaFileManager.Location location,
 String className,
 JavaFileObject.Kind kind)
                                   throws IOException

Description copied from interface: JavaFileManager

Returns a file object for input representing the specified class of the specified kind in the given package-oriented location.

Specified by:

getJavaFileForInput in interface JavaFileManager

Parameters:

location - a location

className - the name of a class

kind - the kind of file, must be one of SOURCE or CLASS

Returns:

a file object, might return null if 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

IllegalStateException - if JavaFileManager.close() has been called and this file manager cannot be reopened

IOException - if an I/O error occurred, or if JavaFileManager.close() has been called and this file manager cannot be reopened

getJavaFileForOutput

public JavaFileObject getJavaFileForOutput(JavaFileManager.Location location,
 String className,
 JavaFileObject.Kind kind,
 FileObject sibling)
                                    throws IOException

Description copied from interface: JavaFileManager

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.

Specified by:

getJavaFileForOutput in interface JavaFileManager

Parameters:

location - a package-oriented location

className - the name of a class

kind - the kind of file, must be one of SOURCE or 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

IllegalStateException - JavaFileManager.close() has been called and this file manager cannot be reopened

IOException - if an I/O error occurred, or if JavaFileManager.close() has been called and this file manager cannot be reopened

getJavaFileForOutputForOriginatingFiles

public 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 originatingFiles represent files that were, in an unspecified way, used to create the content of the file created by this method. See originatingElements in Filer.createSourceFile(java.lang.CharSequence, javax.lang.model.element.Element...). Elements.getFileObjectOf(javax.lang.model.element.Element) may be used to convert the Elements to FileObjects.

Specified by:

getJavaFileForOutputForOriginatingFiles in interface JavaFileManager

Implementation Requirements:

If the subclass of the ForwardingJavaFileManager overrides the getJavaFileForOutput(javax.tools.JavaFileManager.Location, java.lang.String, javax.tools.JavaFileObject.Kind, javax.tools.FileObject) method, this method will delegate to it as per the general contract of JavaFileManager.getJavaFileForOutputForOriginatingFiles(javax.tools.JavaFileManager.Location, java.lang.String, javax.tools.JavaFileObject.Kind, javax.tools.FileObject...). If the subclass does not override the method, the call will be delegated to the fileManager.

Parameters:

location - a package-oriented location

className - the name of a class

kind - the kind of file, must be one of SOURCE or CLASS

originatingFiles - the files which are contributing to this newly created file; null is 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

IllegalStateException - JavaFileManager.close() has been called and this file manager cannot be reopened

IOException - if an I/O error occurred, or if JavaFileManager.close() has been called and this file manager cannot be reopened

See Also:

• Filer.createSourceFile(java.lang.CharSequence, javax.lang.model.element.Element...)

getFileForInput

public FileObject getFileForInput(JavaFileManager.Location location,
 String packageName,
 String relativeName)
                           throws IOException

Description copied from interface: JavaFileManager

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".

Specified by:

getFileForInput in interface JavaFileManager

Parameters:

location - a package-oriented location

packageName - a package name

relativeName - a relative name

Returns:

a file object, might return null if 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 relativeName is not valid, or if the location is a module-oriented location

IllegalStateException - if JavaFileManager.close() has been called and this file manager cannot be reopened

IOException - if an I/O error occurred, or if JavaFileManager.close() has been called and this file manager cannot be reopened

getFileForOutput

public FileObject getFileForOutput(JavaFileManager.Location location,
 String packageName,
 String relativeName,
 FileObject sibling)
                            throws IOException

Description copied from interface: JavaFileManager

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 getFileForInput for an example.

Specified by:

getFileForOutput in interface JavaFileManager

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 relativeName is not valid, or if the location is not an output location

IllegalStateException - if JavaFileManager.close() has been called and this file manager cannot be reopened

IOException - if an I/O error occurred, or if JavaFileManager.close() has been called and this file manager cannot be reopened

getFileForOutputForOriginatingFiles

public 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 originatingFiles represent files that were, in an unspecified way, used to create the content of the file created by this method. See originatingElements in Filer.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 the Elements to FileObjects.

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. See getFileForInput for an example.

Specified by:

getFileForOutputForOriginatingFiles in interface JavaFileManager

Implementation Requirements:

If the subclass of the ForwardingJavaFileManager overrides the getFileForOutput(javax.tools.JavaFileManager.Location, java.lang.String, java.lang.String, javax.tools.FileObject) method, this method will delegate to it as per the general contract of JavaFileManager.getFileForOutputForOriginatingFiles(javax.tools.JavaFileManager.Location, java.lang.String, java.lang.String, javax.tools.FileObject...). If the subclass does not override the method, the call will be delegated to the fileManager.

Parameters:

location - an output location

packageName - a package name

relativeName - a relative name

originatingFiles - the files which are contributing to this newly created file; null is 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 relativeName is not valid, or if the location is not an output location

IllegalStateException - if JavaFileManager.close() has been called and this file manager cannot be reopened

IOException - if an I/O error occurred, or if JavaFileManager.close() has been called and this file manager cannot be reopened

See Also:

• Filer.createResource(javax.tools.JavaFileManager.Location, java.lang.CharSequence, java.lang.CharSequence, javax.lang.model.element.Element...)

flush

public void flush()
           throws IOException

Description copied from interface: JavaFileManager

Flushes any resources opened for output by this file manager directly or indirectly. Flushing a closed file manager has no effect.

Specified by:

flush in interface Flushable

Specified by:

flush in interface JavaFileManager

Throws:

IOException - if an I/O error occurred

See Also:

• JavaFileManager.close()

close

public void close()
           throws IOException

Description copied from interface: JavaFileManager

Releases 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:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface JavaFileManager

Throws:

IOException - if an I/O error occurred

See Also:

• JavaFileManager.flush()

getLocationForModule

public JavaFileManager.Location getLocationForModule(JavaFileManager.Location location,
 String moduleName)
                                              throws IOException

Description copied from interface: JavaFileManager

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.

Specified by:

getLocationForModule in interface JavaFileManager

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

Since:

9

getLocationForModule

public JavaFileManager.Location getLocationForModule(JavaFileManager.Location location,
 JavaFileObject fo)
                                              throws IOException

Description copied from interface: JavaFileManager

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.

Specified by:

getLocationForModule in interface JavaFileManager

Parameters:

location - the module-oriented location

fo - the file

Returns:

the module containing the file

Throws:

IOException - if an I/O error occurred

Since:

9

getServiceLoader

public <S> ServiceLoader<S> getServiceLoader(JavaFileManager.Location location,
 Class<S> service)
                                      throws IOException

Description copied from interface: JavaFileManager

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 in META-INF/services.

Specified by:

getServiceLoader in interface JavaFileManager

Type Parameters:

S - the service class

Parameters:

location - the module-oriented location

service - the Class object of the service class

Returns:

a service loader for the given service class

Throws:

IOException - if an I/O error occurred

Since:

9

inferModuleName

public String inferModuleName(JavaFileManager.Location location)
                       throws IOException

Description copied from interface: JavaFileManager

Infer the name of the module from its location, as returned by getLocationForModule or listModuleLocations.

Specified by:

inferModuleName in interface JavaFileManager

Parameters:

location - a package-oriented location representing a module

Returns:

the name of the module

Throws:

IOException - if an I/O error occurred

Since:

9

listLocationsForModules

public Iterable<Set<JavaFileManager.Location>> listLocationsForModules(JavaFileManager.Location location)
                                                                throws IOException

Description copied from interface: JavaFileManager

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.

Specified by:

listLocationsForModules in interface JavaFileManager

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

Since:

9

contains

public boolean contains(JavaFileManager.Location location,
 FileObject fo)
                 throws IOException

Description copied from interface: JavaFileManager

Determines 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 same file 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:

getLocationForModule(location, moduleName)

such that the file object is contained in the (package-oriented) location for that module.

Specified by:

contains in interface JavaFileManager

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

Since:

9