diff options
Diffstat (limited to 'javax/annotation/processing/Filer.java')
| -rw-r--r-- | javax/annotation/processing/Filer.java | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/javax/annotation/processing/Filer.java b/javax/annotation/processing/Filer.java new file mode 100644 index 000000000..21b21f807 --- /dev/null +++ b/javax/annotation/processing/Filer.java @@ -0,0 +1,215 @@ +/* Filer.java -- Manages file creation for an annotation processor. + Copyright (C) 2012 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package javax.annotation.processing; + +import java.io.IOException; + +import javax.lang.model.element.Element; + +import javax.tools.JavaFileManager; +import javax.tools.JavaFileObject; +import javax.tools.FileObject; + +/** + * <p>This interface supports the creation of new files by the + * annotation processor. Creating files via this interface means + * that they can be tracked by the annotation processing tool. + * Once the file streams are closed, the tool will automatically + * consider them for processing.</p> + * <p>Files are separated into three types: source files, class + * files and resource files. Two locations are defined; one + * for source files and one for class files (resource files + * may use either). Locations are specified using a relative + * path separated by {@code '/'} and not including the + * segments {@code '.'} and {@code '..'} so that they may only + * refer to subdirectories. A valid relative name must match + * the "path-rootless" rule of RFC 3986, section 3.3.</p> + * <p>The file creation methods take a variable number of + * originating elements, which can be used by the tool to + * handle dependency management. For example, if a + * file is generated due to the presence of a particular + * method, the element representing that method may be + * specified as an originating element. Whether this + * information is used by the tool or not is left down + * to the implementator.</p> + * <p>Each run of the annotation processing tool may only + * create a file with a given pathname once. Attempts + * to create the same file a second time will result in + * a {@link FilerException}. The same behaviour results + * from trying to overwrite the initial source files, which + * are classed as being created in the zeroth round of + * processing. The same exception will be thrown if + * the same name is used for both a source file and a + * class file.</p> + * <p>Processors must not knowingly attempt to overwrite + * files that weren't generated by themselves or a similar + * tool. Similarly, the user invoking the tool should + * not configure it so that it will end up overwriting + * files that weren't generated. A {@code Filer} + * implementation may include safeguards so as not to + * overwrite class files such as {@code java.lang.Object}.</p> + * <p>The {@link javax.lang.annotation.Generated} + * annotation is available to denote generated files + * if needed. Some of the effect of overwriting files may + * be achieved by using a decorator-style design + * pattern and either a generated superclass or a series + * of generated subclasses. In the latter case, + * the class would provide the appropriate generated + * subclass via the factory pattern.</p> + * + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.6 + */ +public interface Filer +{ + + /** + * Returns a {@link JavaFileObject} for writing a class + * file. The name and location of the created file are + * based on the specified type name. The location used + * is relative to the root location for class files. + * A class file may be created for a package by appending + * the suffix {@code ".package-info"} to the name. The + * contents of the class file should be compatible with + * source version being used for this run of the annotation + * processor. + * + * @param name the name of the type (or package if + * the {@code ".package-info"} suffix) to create + * a class file for. + * @param elements program elements associated with this class + * file. May be {@code null} or incomplete. + * @return access to the new class file via a {@link JavaFileObject}. + * @throws FilerException if the same pathname has already been used, + * the same type has already been created or + * the name is invalid. + * @throws IOException if an I/O error occurs. + */ + JavaFileObject createClassFile(CharSequence name, Element... elements) + throws IOException; + + /** + * <p>Returns a {@link FileObject} for writing a resource file. + * The name and location of the created file are determined + * by combining the given location (either that used by class + * files, source files or another location supported by the + * implementation), the name of a package in which the resource + * should live (if any), and the specified name.</p> + * <p>Files created by this method are not registered for annotation + * processing.</p> + * + * @param location the location to use for the resource. Can be + * {@link javax.tools.StandardLocation#CLASS_OUTPUT}, + * {@link javax.tools.StandardLocation#SOURCE_OUTPUT}, + * or another location supported by the implementation. + * @param pkg the package which should contain the resource, or the + * empty string if one is not used. + * @param relName the final path components of the file name, which will + * be relative to the location and (if specified) the package. + * @param elements program elements associated with this resource + * file. May be {@code null} or incomplete. + * @return access to the new resource file via a {@link FileObject}. + * @throws FilerException if the same pathname has already been used. + * @throws IOException if an I/O error occurs. + * @throws IllegalArgumentException if the location specified is not supported, + * or {@code relName} is not relative. + */ + FileObject createResource(JavaFileManager.Location location, + CharSequence pkg, CharSequence relName, + Element... elements) + throws IOException; + + /** + * <p>Returns a {@link JavaFileObject} for writing a source + * file. The name and location of the created file are + * based on the specified type name. If more than one + * type is being declared, the top-level one should be used. + * The location used is relative to the root location for + * source files. A source file may be created for a package by + * appending the suffix {@code ".package-info"} to the name. The + * contents of the source file should be compatible with + * source version being used for this run of the annotation + * processor.</p> + * <p>The character set used by the {@link java.io.OutputStream} + * of the returned object is determined by the implementation, + * and may be set using either the platform default or by an + * option passed to the annotation processing tool. To override + * this, users can wrap the stream in an + * {@link java.io.OutputStreamWriter}.</p> + * + * @param name the fully-qualified name of the type (or package if + * the {@code ".package-info"} suffix) to create + * a source file for. + * @param elements program elements associated with this source + * file. May be {@code null} or incomplete. + * @return access to the new source file via a {@link JavaFileObject}. + * @throws FilerException if the same pathname has already been used, + * the same type has already been created or + * the name is invalid. + * @throws IOException if an I/O error occurs. + */ + JavaFileObject createSourceFile(CharSequence name, Element... elements) + throws IOException; + + /** + * Returns a {@link FileObject} for reading a resource file. + * The name and location of the file to read are determined + * by combining the given location (either that used by class + * files, source files or another location supported by the + * implementation), the name of a package in which the resource + * lives (if any), and the specified name. + * + * @param location the location to use for the resource. Can be + * {@link javax.tools.StandardLocation#CLASS_OUTPUT}, + * {@link javax.tools.StandardLocation#SOURCE_OUTPUT}, + * or another location supported by the implementation. + * @param pkg the package which contains the resource, or the + * empty string if one is not used. + * @param relName the final path components of the file name, which will + * be relative to the location and (if specified) the package. + * @return access to the new resource file via a {@link FileObject}. + * @throws FilerException if the same pathname is open for writing. + * @throws IOException if an I/O error occurs. + * @throws IllegalArgumentException if the location specified is not supported, + * or {@code relName} is not relative. + */ + FileObject getResource(JavaFileManager.Location location, + CharSequence pkg, CharSequence relName) + throws IOException; + +} |