helloworldap.java

来自「是一款用JAVA 编写的编译器 具有很强的编译功能」· Java 代码 · 共 88 行

/*
 * Copyright 2006-2007 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.
 *
 * 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.
 */

import java.io.*;
import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.lang.model.type.*;
import javax.lang.model.util.*;
import static javax.tools.Diagnostic.Kind.*;

import java.util.Set;

@SupportedAnnotationTypes({"*"})
public class HelloWorldAP extends AbstractProcessor {
    Messager msgr = null;
    Filer filer = null;
    boolean DONE=false;

    @Override
    public void init(ProcessingEnvironment penv) {	
	processingEnv = penv;
	msgr=penv.getMessager();
	filer=penv.getFiler();
    }

    public boolean process(Set<? extends TypeElement> tes, RoundEnvironment renv ) {
	boolean ret = true;
	if(!renv.processingOver() && !DONE) {
	    msgr.printMessage(NOTE, "running process to create HelloWorld.");
	    try {
	        Writer pw = filer.createSourceFile("HelloWorld").openWriter();
		pw.write("public class HelloWorld {\n"); 
		pw.write("  public static void main (String argv[]) {\n"); 
		pw.write("    System.out.println(\"Hello apt world.\");\n"); 
		pw.write("  }\n");
		pw.write("}\n"); 
		pw.flush();
		pw.close();

		OutputStream os = filer.createClassFile("HelloWorldAP").openOutputStream();
		// the easiest way to create a class file is to copy another one
		InputStream is = getClass().getResourceAsStream("HelloWorldAP.class");
		copy(is, os);
		is.close();
		os.flush();
		os.close();
		DONE=true;
	    } 
	    catch (IOException ioe) {
		msgr.printMessage(ERROR, ioe.getMessage());
		ret = false;
	    }
	    catch (Exception e) {
		msgr.printMessage(ERROR, e.getMessage());
		ret = false;
	    }
	}
	return ret;
    }

    void copy(InputStream is, OutputStream os) throws IOException {
	byte[] buf = new byte[8192];
	int n;
	while ((n = is.read(buf, 0, buf.length)) > 0)
	    os.write(buf, 0, n);
    }
}