test/langtools/tools/javac/processing/rounds/OverwriteBetweenCompilations.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8038455
 * @summary Verify that annotation processor can overwrite source and class files it generated
 *          during previous compilations, and that the Symbols are updated appropriately.
 * @library /tools/lib /tools/javac/lib/
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 *          jdk.compiler/com.sun.tools.javac.processing
 *          jdk.compiler/com.sun.tools.javac.util
 *          jdk.jdeps/com.sun.tools.javap
 * @clean *
 * @build toolbox.ToolBox toolbox.JavacTask
 * @build OverwriteBetweenCompilations JavacTestingAbstractProcessor
 * @compile/ref=OverwriteBetweenCompilations_1.out -XDaccessInternalAPI -processor OverwriteBetweenCompilations -Apass=1 -parameters -XDrawDiagnostics OverwriteBetweenCompilationsSource.java
 * @compile/ref=OverwriteBetweenCompilations_2.out -XDaccessInternalAPI -processor OverwriteBetweenCompilations -Apass=2 -parameters -XDrawDiagnostics OverwriteBetweenCompilationsSource.java
 * @compile/ref=OverwriteBetweenCompilations_3.out -XDaccessInternalAPI -processor OverwriteBetweenCompilations -Apass=3 -parameters -XDrawDiagnostics OverwriteBetweenCompilationsSource.java
 */

import java.io.*;
import java.util.*;

import javax.annotation.processing.*;
import javax.lang.model.element.*;
import javax.tools.*;

import com.sun.tools.javac.processing.JavacProcessingEnvironment;
import com.sun.tools.javac.processing.PrintingProcessor.PrintingElementVisitor;
import com.sun.tools.javac.util.Log;
import com.sun.tools.javac.util.Log.WriterKind;

import toolbox.JavacTask;
import toolbox.ToolBox;

@SupportedOptions("pass")
public class OverwriteBetweenCompilations extends JavacTestingAbstractProcessor {
    int round = 1;
    @Override
    public boolean process(Set<? extends TypeElement> annotations,
                           RoundEnvironment roundEnv) {
        Log log = Log.instance(((JavacProcessingEnvironment) processingEnv).getContext());
        PrintWriter pw = log.getWriter(WriterKind.NOTICE);

        pw.println("round: " + round);

        TypeElement generatedSource =
                processingEnv.getElementUtils().getTypeElement("GeneratedSource");

        if (generatedSource != null) {
            new PrintingElementVisitor(pw, processingEnv.getElementUtils()).visit(generatedSource);
            pw.flush();
        }

        TypeElement generatedClass =
                processingEnv.getElementUtils().getTypeElement("GeneratedClass");

        if (generatedClass != null) {
            new PrintingElementVisitor(pw, processingEnv.getElementUtils()).visit(generatedClass);
            pw.flush();
        }

        int pass = Integer.parseInt(processingEnv.getOptions().get("pass"));

        if (round++ == 1) {
            try (Writer out = filer.createSourceFile("GeneratedSource").openWriter()) {
                String code = pass != 2 ? GENERATED_INIT : GENERATED_UPDATE;
                code = code.replace("NAME", "GeneratedSource");
                out.write(code);
            } catch (IOException e) {
                processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, e.toString());
            }
            try (OutputStream out = filer.createClassFile("GeneratedClass").openOutputStream()) {
                String code = pass != 2 ? GENERATED_INIT : GENERATED_UPDATE;
                code = code.replace("NAME", "GeneratedClass");

                ToolBox tb = new ToolBox();
                ToolBox.MemoryFileManager mfm = new ToolBox.MemoryFileManager();
                new JavacTask(tb)
                        .fileManager(mfm)
                        .options("-parameters")
                        .sources(code)
                        .run();

                out.write(mfm.getFileBytes(StandardLocation.CLASS_OUTPUT, "GeneratedClass"));
            } catch (IOException e) {
                processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, e.toString());
            }
        }

        return false;
    }

    //the initial generated class - "NAME" will be replaced with either "GeneratedSource" or
    //"GeneratedClass" while generating the class:
    private static final String GENERATED_INIT =
            "@Deprecated\n" +
            "public class NAME<T extends CharSequence> extends java.util.ArrayList<String>\n" +
            "                                          implements Runnable {\n" +
            "    public void test(int a) { }\n" +
            "    public void run() { }\n" +
            "}";

    //generated class update- "NAME" will be replaced with either "GeneratedSource" or
    //"GeneratedClass" while generating the class:
    private static final String GENERATED_UPDATE =
            "@javax.annotation.processing.SupportedAnnotationTypes(\"*\")\n" +
            "public abstract class NAME<E extends Number> extends java.util.LinkedList<Number>" +
            "                                             implements Runnable, CharSequence {\n" +
            "    public void test(long a) { }\n" +
            "}";
}