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

Direct Known Subclasses:

WrappingJavaFileManager

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.

Since:

1.6

Author:

Peter von der Ahé

Nested Class Summary

Nested classes/interfaces inherited from interface javax.tools.JavaFileManager

JavaFileManager.Location

Field Summary

Fields

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	close() Releases any resources opened by this file manager directly or indirectly.
void	flush() Flushes any resources opened for output by this file manager directly or indirectly.
ClassLoader	getClassLoader(JavaFileManager.Location location) Gets a class loader for loading plug-ins from the given location.
FileObject	getFileForInput(JavaFileManager.Location location, String packageName, String relativeName) Gets a file object for input representing the specified relative name in the specified package in the given location.
FileObject	getFileForOutput(JavaFileManager.Location location, String packageName, String relativeName, FileObject sibling) Gets 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) Gets a file object for input representing the specified class of the specified kind in the given location.
JavaFileObject	getJavaFileForOutput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject sibling) Gets a file object for output representing the specified class of the specified kind in the 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 location.
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 location.

Methods inherited from class java.lang.Object

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

Field Detail

fileManager

protected final M extends JavaFileManager fileManager

The file manager which all methods are delegated to.

Constructor Detail

ForwardingJavaFileManager

protected ForwardingJavaFileManager(M fileManager)

Creates a new instance of ForwardingJavaFileManager.

Parameters:

fileManager - delegate to this file manager

Method Detail

getClassLoader

public ClassLoader getClassLoader(JavaFileManager.Location location)

Description copied from interface: JavaFileManager

Gets a class loader for loading plug-ins from the given 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 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 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

Gets a file object for input representing the specified class of the specified kind in the given 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

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

Gets a file object for output representing the specified class of the specified kind 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.

Specified by:

getJavaFileForOutput 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

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

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

getFileForInput

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

Description copied from interface: JavaFileManager

Gets a file object for input representing the specified relative name in the specified package in the given 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 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

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

Gets 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 - a 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

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

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 Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface JavaFileManager

Throws:

IOException - if an I/O error occurred

See Also:

JavaFileManager.flush()