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Java example source code file (ClassProcessor.java)

This example Java source code file (ClassProcessor.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

classprocessor, couldn't, datainputstream, elementkind, fileinputstream, ioexception, modifiers, outputstream, package, roundenvironment, string, supportedoptions, typeelement, unexpected, util

The ClassProcessor.java Java example source code

/*
 * Copyright (c) 2010, 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.
 *
 * 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.
 */

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

/*
 * @test
 * @bug 6499119
 * @summary Created package-info class file modeled improperly
 * @library /tools/javac/lib
 * @build   JavacTestingAbstractProcessor
 * @compile ClassProcessor.java package-info.java
 * @compile/process -cp . -processor ClassProcessor -Akind=java  java.lang.Object
 * @compile/process -cp . -processor ClassProcessor -Akind=class java.lang.Object
 */

@SupportedOptions({ "gen", "expect" })
public class ClassProcessor extends JavacTestingAbstractProcessor {
    int round = 1;

    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        if (round == 1) {
            System.out.println("-- Round 1 --");
            createPackageFile();
        } else if (round == 2) {
            boolean found_foo_A = false;
            System.out.println("-- Round 2 --");
            for(Element e: roundEnv.getRootElements()) {
                System.out.println("ElementKind: " + e.getKind());
                System.out.println("Modifiers:   " + e.getModifiers());
                System.out.println("Annotations: " + e.getAnnotationMirrors());
                if (e.getAnnotationMirrors().toString().equals("@foo.A")) {
                    found_foo_A = true;
                    checkEqual("ElementKind", e.getKind().toString(), "PACKAGE");
                    checkEqual("Modifiers",   e.getModifiers().toString(), "[]");
                }
            }
            if (!found_foo_A)
                error("did not find @foo.A");
        }
        round++;
        return true;
    }

    private void createPackageFile() {
        String kind = processingEnv.getOptions().get("kind");

        File pkgInfo;
        if (kind.equals("java"))
            pkgInfo = new File(System.getProperty("test.src"),     "package-info.java");
        else
            pkgInfo = new File(System.getProperty("test.classes"), "foo/package-info.class");

        byte[] bytes = new byte[(int) pkgInfo.length()];
        DataInputStream in = null;
        try {
            in = new DataInputStream(new FileInputStream(pkgInfo));
            in.readFully(bytes);
        } catch (IOException ioe) {
            error("Couldn't read package info file: " + ioe);
        } finally {
            if(in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    error("InputStream closing failed: " + e);
                }
            }
        }

        OutputStream out = null;
        try {
            if (kind.equals("java"))
                out = filer.createSourceFile("foo.package-info").openOutputStream();
            else
                out = filer.createClassFile("foo.package-info").openOutputStream();
            out.write(bytes, 0, bytes.length);
        } catch (IOException ioe) {
            error("Couldn't create package info file: " + ioe);
        } finally {
            if(out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    error("OutputStream closing failed: " + e);
                }
            }
        }
    }

    private void checkEqual(String label, String actual, String expect) {
        if (!actual.equals(expect)) {
            error("Unexpected value for " + label + "; actual=" + actual + ", expected=" + expect);
        }
    }

    private void error(String msg) {
        messager.printMessage(Kind.ERROR, msg);
    }
}

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