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public interface JavaFileManager extends OptionChecker
File manager for tools operating on Java™ programming language source and class files. In this context, file means an abstraction of regular files and other sources of data.
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 (JLS) 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 {@link java.io.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:
URI.{@linkplain java.net.URI#create create}(relativeName).{@linkplain java.net.URI#normalize normalize}().{@linkplain java.net.URI#getPath getPath}().equals(relativeName)
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 {@linkplain java.util.jar.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 {@code null} argument.
Nested Class Summary | |
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static interface |
Interface for locations of file objects. |
Method Summary | |
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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 javax.tools.FileObject 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 javax.tools.FileObject 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 javax.tools.JavaFileObject 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 javax.tools.JavaFileObject for output representing the specified class of the specified kind in the given location. |
boolean |
handleOption(String current, Iterator 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. |
Iterable |
list(JavaFileManager.Location location, String packageName, Set kinds, boolean recurse) Lists all file objects matching the given criteria in the given location. |
Methods inherited from class javax.tools.OptionChecker |
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isSupportedOption |
Method Detail |
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public void close() throws IOException
IOException
- if an I/O error occurredpublic void flush() throws IOException
IOException
- if an I/O error occurredpublic ClassLoader getClassLoader(JavaFileManager.Location location)
location
- a locationpublic FileObject getFileForInput(JavaFileManager.Location location, String packageName, String relativeName) throws IOException
If the returned object represents a {@linkplain JavaFileObject.Kind#SOURCE source} or {@linkplain JavaFileObject.Kind#CLASS class} file, it must be an instance of {@link 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 {@linkplain StandardLocation#SOURCE_PATH 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"
.
location
- a locationpackageName
- a package namerelativeName
- a relative nameIOException
- if an I/O error occurred, or if {@link
#close} has been called and this file manager cannot be
reopenedpublic FileObject getFileForOutput(JavaFileManager.Location location, String packageName, String relativeName, FileObject sibling) throws IOException
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 {@linkplain JavaFileObject.Kind#SOURCE source} or {@linkplain JavaFileObject.Kind#CLASS class} file, it must be an instance of {@link 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 {@link #getFileForInput getFileForInput} for an example.
location
- a locationpackageName
- a package namerelativeName
- a relative namesibling
- a file object to be used as hint for placement;
might be {@code null}IOException
- if an I/O error occurred, or if {@link
#close} has been called and this file manager cannot be
reopenedpublic JavaFileObject getJavaFileForInput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind) throws IOException
location
- a locationclassName
- the name of a classkind
- the kind of file, must be one of {@link
JavaFileObject.Kind#SOURCE SOURCE} or {@link
JavaFileObject.Kind#CLASS CLASS}IOException
- if an I/O error occurred, or if {@link
#close} has been called and this file manager cannot be
reopenedpublic JavaFileObject getJavaFileForOutput(JavaFileManager.Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException
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.
location
- a locationclassName
- the name of a classkind
- the kind of file, must be one of {@link
JavaFileObject.Kind#SOURCE SOURCE} or {@link
JavaFileObject.Kind#CLASS CLASS}sibling
- a file object to be used as hint for placement;
might be {@code null}IOException
- if an I/O error occurred, or if {@link
#close} has been called and this file manager cannot be
reopenedpublic boolean handleOption(String current, Iterator remaining)
current
- current optionremaining
- remaining optionspublic boolean hasLocation(JavaFileManager.Location location)
location
- a locationpublic String inferBinaryName(JavaFileManager.Location location, JavaFileObject file)
location
- a locationfile
- a file objectpublic boolean isSameFile(FileObject a, FileObject b)
a
- a file objectb
- a file objectpublic Iterable list(JavaFileManager.Location location, String packageName, Set kinds, boolean recurse) throws IOException
Note: even if the given location is unknown to this file manager, it may not return {@code null}. Also, an unknown location may not cause an exception.
location
- a locationpackageName
- a package namekinds
- return objects only of these kindsrecurse
- if true include "subpackages"IOException
- if an I/O error occurred, or if {@link
#close} has been called and this file manager cannot be
reopened
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