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+/* Messager.java -- Allows an annotation processor to report messages.
+   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 javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.AnnotationValue;
+import javax.lang.model.element.Element;
+
+import static javax.tools.Diagnostic.Kind;
+
+/**
+ * Provides a way for an annotation processor to report
+ * messages to the user.  Messages may use elements,
+ * annotations and annotation values to provide a location
+ * hint, but these may be either unavailable or only
+ * approximate.  Printing a message of kind
+ * {@link javax.tools.Diagnostic,Kind#ERROR} will cause
+ * an error to be raised.  How the messages are displayed
+ * is left to the implementor; it may be a simple use of
+ * {@code System.out} and/or {@code System.err} or something
+ * more graphical if the application has a user interface.
+ *
+ * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
+ * @since 1.6
+ */
+public interface Messager
+{
+
+  /**
+   * Prints a message of the specified kind.
+   *
+   * @param kind the kind of message to print.
+   * @param message the message to print.
+   */
+  void printMessage(Kind kind, CharSequence message);
+
+  /**
+   * Prints a message of the specified kind at
+   * the location of the given element.
+   *
+   * @param kind the kind of message to print.
+   * @param message the message to print.
+   * @param element the element to use for positioning.
+   */
+  void printMessage(Kind kind, CharSequence message,
+		    Element element);
+
+  /**
+   * Prints a message of the specified kind at the
+   * location of the annotation mirror of the given
+   * annotated element.
+   *
+   * @param kind the kind of message to print.
+   * @param message the message to print.
+   * @param element the annotated element.
+   * @param annotation the annotation to use for
+   *                   positioning.
+   */
+  void printMessage(Kind kind, CharSequence message,
+		    Element element,
+		    AnnotationMirror annotation);
+
+  /**
+   * Prints a message of the specified kind at the
+   * location of the annotation value inside the
+   * annotation mirror of the given annotated element.
+   *
+   * @param kind the kind of message to print.
+   * @param message the message to print.
+   * @param element the annotated element.
+   * @param annotation the annotation containing the value.
+   * @param value the annotation value to use for positioning.
+   */
+  void printMessage(Kind kind, CharSequence message,
+		    Element element,
+		    AnnotationMirror annotation,
+		    AnnotationValue value);
+
+}