Java™ Platform
Standard Ed. 6

javax.tools
Class ForwardingJavaFileManager<M extends JavaFileManager>

java.lang.Object
  extended by javax.tools.ForwardingJavaFileManager<M>
Type Parameters:
M - the kind of file manager forwarded to by this object
All Implemented Interfaces:
Closeable, Flushable, 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.

Since:
1.6

Nested Class Summary
 
Nested classes/interfaces inherited from interface javax.tools.JavaFileManager
JavaFileManager.Location
 
Field Summary
protected  M fileManager
          The file manager which all methods are delegated to.
 
Constructor Summary
protected ForwardingJavaFileManager(M fileManager)
          Creates a new instance of ForwardingJavaFileManager.
 
Method Summary
 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 JLS binary name.

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. Sun's 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. Sun's 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 JavaFileManager
Throws:
IOException - if an I/O error occurred
See Also:
JavaFileManager.flush()

Java™ Platform
Standard Ed. 6

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