/*

 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.processing;

import com.sun.tools.javac.model.JavacElements;

import com.sun.tools.javac.util.*;

import com.sun.tools.javac.tree.JCTree;

import com.sun.tools.javac.tree.JCTree.*;

import javax.lang.model.element.*;

import javax.tools.JavaFileObject;

import javax.tools.Diagnostic;

import javax.annotation.processing.*;

/**

 * An implementation of the Messager built on top of log.

 *

 * <p><b>This is NOT part of any supported API.

 * If you write code that depends on this, you do so at your own risk.

 * This code and its internal interfaces are subject to change or

 * deletion without notice.</b>

 */

public class JavacMessager implements Messager {

    Log log;

    JavacProcessingEnvironment processingEnv;

    int errorCount = 0;

    int warningCount = 0;

    JavacMessager(Context context, JavacProcessingEnvironment processingEnv) {

        log = Log.instance(context);

        this.processingEnv = processingEnv;

    }

    // processingEnv.getElementUtils()

    public void printMessage(Diagnostic.Kind kind, CharSequence msg) {

        printMessage(kind, msg, null, null, null);

    }

    public void printMessage(Diagnostic.Kind kind, CharSequence msg,

                      Element e) {

        printMessage(kind, msg, e, null, null);

    }

    /**

     * Prints a message of the specified kind at the location of the

     * annotation mirror of the annotated element.

     *

     * @param kind the kind of message

     * @param msg  the message, or an empty string if none

     * @param e    the annotated element

     * @param a    the annotation to use as a position hint

     */

    public void printMessage(Diagnostic.Kind kind, CharSequence msg,

                      Element e, AnnotationMirror a) {

        printMessage(kind, msg, e, a, null);

    }

    /**

     * Prints a message of the specified kind at the location of the

     * annotation value inside the annotation mirror of the annotated

     * element.

     *

     * @param kind the kind of message

     * @param msg  the message, or an empty string if none

     * @param e    the annotated element

     * @param a    the annotation containing the annotaiton value

     * @param v    the annotation value to use as a position hint

     */

    public void printMessage(Diagnostic.Kind kind, CharSequence msg,

                      Element e, AnnotationMirror a, AnnotationValue v) {

        JavaFileObject oldSource = null;

        JavaFileObject newSource = null;

        JCDiagnostic.DiagnosticPosition pos = null;

        JavacElements elemUtils = processingEnv.getElementUtils();

        Pair<JCTree, JCCompilationUnit> treeTop = elemUtils.getTreeAndTopLevel(e, a, v);

        if (treeTop != null) {

            newSource = treeTop.snd.sourcefile;

            if (newSource != null) {

                // save the old version and reinstate it later

                oldSource = log.useSource(newSource);

                pos = treeTop.fst.pos();

            }

        }

        try {

            switch (kind) {

            case ERROR:

                errorCount++;

                boolean prev = log.multipleErrors;

                log.multipleErrors = true;

                try {

                    log.error(pos, "proc.messager", msg.toString());

                } finally {

                    log.multipleErrors = prev;

                }

                break;

            case WARNING:

                warningCount++;

                log.warning(pos, "proc.messager", msg.toString());

                break;

            case MANDATORY_WARNING:

                warningCount++;

                log.mandatoryWarning(pos, "proc.messager", msg.toString());

                break;

            default:

                log.note(pos, "proc.messager", msg.toString());

                break;

            }

        } finally {

            // reinstate the saved version, only if it was saved earlier

            if (newSource != null)

                log.useSource(oldSource);

        }

    }

    /**

     * Prints an error message.

     * Equivalent to {@code printError(null, msg)}.

     * @param msg  the message, or an empty string if none

     */

    public void printError(String msg) {

        printMessage(Diagnostic.Kind.ERROR, msg);

    }

    /**

     * Prints a warning message.

     * Equivalent to {@code printWarning(null, msg)}.

     * @param msg  the message, or an empty string if none

     */

    public void printWarning(String msg) {

        printMessage(Diagnostic.Kind.WARNING, msg);

    }

    /**

     * Prints a notice.

     * @param msg  the message, or an empty string if none

     */

    public void printNotice(String msg) {

        printMessage(Diagnostic.Kind.NOTE, msg);

    }

    public boolean errorRaised() {

        return errorCount > 0;

    }

    public int errorCount() {

        return errorCount;

    }

    public int warningCount() {

        return warningCount;

    }

    public void newRound() {

        errorCount = 0;

    }

    public String toString() {

        return "javac Messager";

    }

}