javacmessager.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * Copyright 2005-2006 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.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.comp.*;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.*;
import com.sun.tools.javac.util.Position;
import javax.lang.model.element.*;
import javax.tools.JavaFileObject;
import javax.tools.Diagnostic;
import javax.annotation.processing.*;
import java.util.*;

/** 
 * An implementation of the Messager built on top of log.
 *
 * <p><b>This is NOT part of any API supported by Sun Microsystems.
 * 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;

    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) {
		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:
		log.warning(pos, "proc.messager", msg.toString());
                break;
                
	    case MANDATORY_WARNING:
		log.mandatoryWarning(pos, "proc.messager", msg.toString());
		break;

	    default:
		log.note(pos, "proc.messager", msg.toString());
		break;
	    }
	} finally {
	    if (oldSource != 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 void newRound(Context context) {
	log = Log.instance(context);
	errorCount = 0;
    }

    public String toString() {
	return "javac Messager";
    }
}