Package ch.obermuhlner.scriptengine.java

Class MemoryFileManager

java.lang.Object

ch.obermuhlner.scriptengine.java.MemoryFileManager

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable, javax.tools.JavaFileManager, javax.tools.OptionChecker

public class MemoryFileManager
extends java.lang.Object
implements javax.tools.JavaFileManager

File manager for the compiler API. Reads from memory (Strings) and writes class files to memory (cached OutputMemoryJavaFileObject). Slightly modified from the original implementation in jdk.jshell.MemoryFileManager

Nested Class Summary

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

javax.tools.JavaFileManager.Location

Constructor Summary

Constructors

Constructor	Description
MemoryFileManager(javax.tools.StandardJavaFileManager standardManager)

Method Summary

Modifier and Type	Method	Description
void	close()	Releases any resources opened by this file manager directly or indirectly.
boolean	contains(javax.tools.JavaFileManager.Location location, javax.tools.FileObject file)
javax.tools.JavaFileObject	createSourceFileObject(java.lang.Object origin, java.lang.String name, java.lang.String code)
void	dumpClasses()
void	flush()	Flushes any resources opened for output by this file manager directly or indirectly.
java.lang.ClassLoader	getClassLoader(javax.tools.JavaFileManager.Location location)	Returns a class loader for loading plug-ins from the given location.
javax.tools.FileObject	getFileForInput(javax.tools.JavaFileManager.Location location, java.lang.String packageName, java.lang.String relativeName)	Returns a file object for input representing the specified relative name in the specified package in the given location.
javax.tools.FileObject	getFileForOutput(javax.tools.JavaFileManager.Location location, java.lang.String packageName, java.lang.String relativeName, javax.tools.FileObject sibling)	Returns a file object for output representing the specified relative name in the specified package in the given location.
javax.tools.JavaFileObject	getJavaFileForInput(javax.tools.JavaFileManager.Location location, java.lang.String className, javax.tools.JavaFileObject.Kind kind)	Returns a file object for input representing the specified class of the specified kind in the given location.
javax.tools.JavaFileObject	getJavaFileForOutput(javax.tools.JavaFileManager.Location location, java.lang.String className, javax.tools.JavaFileObject.Kind kind, javax.tools.FileObject sibling)	Returns a file object for output representing the specified class of the specified kind in the given location.
javax.tools.JavaFileManager.Location	getLocationForModule(javax.tools.JavaFileManager.Location location, java.lang.String moduleName)
javax.tools.JavaFileManager.Location	getLocationForModule(javax.tools.JavaFileManager.Location location, javax.tools.JavaFileObject fo)
boolean	handleOption(java.lang.String current, java.util.Iterator<java.lang.String> remaining)	Handles one option.
boolean	hasLocation(javax.tools.JavaFileManager.Location location)	Determines if a location is known to this file manager.
java.lang.String	inferBinaryName(javax.tools.JavaFileManager.Location location, javax.tools.JavaFileObject file)	Infers a binary name of a file object based on a location.
java.lang.String	inferModuleName(javax.tools.JavaFileManager.Location location)
boolean	isSameFile(javax.tools.FileObject a, javax.tools.FileObject b)	Compares two file objects and return true if they represent the same underlying object.
int	isSupportedOption(java.lang.String option)	Determines if the given option is supported and if so, the number of arguments the option takes.
java.lang.Iterable<javax.tools.JavaFileObject>	list(javax.tools.JavaFileManager.Location location, java.lang.String packageName, java.util.Set<javax.tools.JavaFileObject.Kind> kinds, boolean recurse)	Lists all file objects matching the given criteria in the given location.
java.lang.Iterable<java.util.Set<javax.tools.JavaFileManager.Location>>	listLocationsForModules(javax.tools.JavaFileManager.Location location)

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.tools.JavaFileManager

getServiceLoader

Constructor Detail

MemoryFileManager

public MemoryFileManager(javax.tools.StandardJavaFileManager standardManager)

Method Detail

dumpClasses

public void dumpClasses()

createSourceFileObject

public javax.tools.JavaFileObject createSourceFileObject(java.lang.Object origin,
                                                         java.lang.String name,
                                                         java.lang.String code)

getClassLoader

public java.lang.ClassLoader getClassLoader(javax.tools.JavaFileManager.Location location)

Returns 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 javax.tools.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:

java.lang.SecurityException - if a class loader can not be created in the current security context

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

list

public java.lang.Iterable<javax.tools.JavaFileObject> list(javax.tools.JavaFileManager.Location location,
                                                           java.lang.String packageName,
                                                           java.util.Set<javax.tools.JavaFileObject.Kind> kinds,
                                                           boolean recurse)
                                                    throws java.io.IOException

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 javax.tools.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:

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

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

inferBinaryName

public java.lang.String inferBinaryName(javax.tools.JavaFileManager.Location location,
                                        javax.tools.JavaFileObject file)

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 javax.tools.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:

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

isSameFile

public boolean isSameFile(javax.tools.FileObject a,
                          javax.tools.FileObject b)

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

Specified by:

isSameFile in interface javax.tools.JavaFileManager

Parameters:

a - a file object

b - a file object

Returns:

true if the given file objects represent the same underlying object

Throws:

java.lang.IllegalArgumentException - if either of the arguments were created with another file manager and this file manager does not support foreign file objects

isSupportedOption

public int isSupportedOption(java.lang.String option)

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

Specified by:

isSupportedOption in interface javax.tools.OptionChecker

Parameters:

option - an option

Returns:

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

handleOption

public boolean handleOption(java.lang.String current,
                            java.util.Iterator<java.lang.String> remaining)

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 javax.tools.JavaFileManager

Parameters:

current - current option

remaining - remaining options

Returns:

true if this option was handled by this file manager, false otherwise

Throws:

java.lang.IllegalArgumentException - if this option to this file manager is used incorrectly

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

hasLocation

public boolean hasLocation(javax.tools.JavaFileManager.Location location)

Determines if a location is known to this file manager.

Specified by:

hasLocation in interface javax.tools.JavaFileManager

Parameters:

location - a location

Returns:

true if the location is known

getJavaFileForInput

public javax.tools.JavaFileObject getJavaFileForInput(javax.tools.JavaFileManager.Location location,
                                                      java.lang.String className,
                                                      javax.tools.JavaFileObject.Kind kind)
                                               throws java.io.IOException

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

Specified by:

getJavaFileForInput in interface javax.tools.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:

java.lang.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

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

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

getJavaFileForOutput

public javax.tools.JavaFileObject getJavaFileForOutput(javax.tools.JavaFileManager.Location location,
                                                       java.lang.String className,
                                                       javax.tools.JavaFileObject.Kind kind,
                                                       javax.tools.FileObject sibling)
                                                throws java.io.IOException

Returns 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 javax.tools.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:

java.lang.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

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

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

getFileForInput

public javax.tools.FileObject getFileForInput(javax.tools.JavaFileManager.Location location,
                                              java.lang.String packageName,
                                              java.lang.String relativeName)
                                       throws java.io.IOException

Returns 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 javax.tools.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:

java.lang.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

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

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

getFileForOutput

public javax.tools.FileObject getFileForOutput(javax.tools.JavaFileManager.Location location,
                                               java.lang.String packageName,
                                               java.lang.String relativeName,
                                               javax.tools.FileObject sibling)
                                        throws java.io.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 getFileForInput for an example.

Specified by:

getFileForOutput in interface javax.tools.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:

java.lang.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

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

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

getLocationForModule

public javax.tools.JavaFileManager.Location getLocationForModule(javax.tools.JavaFileManager.Location location,
                                                                 java.lang.String moduleName)
                                                          throws java.io.IOException

Specified by:

getLocationForModule in interface javax.tools.JavaFileManager

Throws:

java.io.IOException

getLocationForModule

public javax.tools.JavaFileManager.Location getLocationForModule(javax.tools.JavaFileManager.Location location,
                                                                 javax.tools.JavaFileObject fo)
                                                          throws java.io.IOException

Specified by:

getLocationForModule in interface javax.tools.JavaFileManager

Throws:

java.io.IOException

inferModuleName

public java.lang.String inferModuleName(javax.tools.JavaFileManager.Location location)
                                 throws java.io.IOException

Specified by:

inferModuleName in interface javax.tools.JavaFileManager

Throws:

java.io.IOException

listLocationsForModules

public java.lang.Iterable<java.util.Set<javax.tools.JavaFileManager.Location>> listLocationsForModules(javax.tools.JavaFileManager.Location location)
                                                                                                throws java.io.IOException

Specified by:

listLocationsForModules in interface javax.tools.JavaFileManager

Throws:

java.io.IOException

contains

public boolean contains(javax.tools.JavaFileManager.Location location,
                        javax.tools.FileObject file)
                 throws java.io.IOException

Specified by:

contains in interface javax.tools.JavaFileManager

Throws:

java.io.IOException

flush

public void flush()
           throws java.io.IOException

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 java.io.Flushable

Specified by:

flush in interface javax.tools.JavaFileManager

Throws:

java.io.IOException - if an I/O error occurred

See Also:

close()

close

public void close()
           throws java.io.IOException

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 java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface javax.tools.JavaFileManager

Throws:

java.io.IOException - if an I/O error occurred

See Also:

flush()