Java example source code file (DocLintTest.java)

This example Java source code file (DocLintTest.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

compilation, dl_err6, dl_wrn12, exception, javactask, message, net, network, opt_badarg, override, printwriter, regex, set, string, stringwriter, util, xdoclint\:badarg, xdoclint\:reference

The DocLintTest.java Java example source code

/*
 * Copyright (c) 2012, 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.
 */

/*
 * @test
 * @bug 8004833
 * @summary Integrate doclint support into javac
 */

import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URI;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.tools.Diagnostic;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
import static javax.tools.Diagnostic.Kind.*;

import com.sun.source.util.JavacTask;
import com.sun.tools.javac.main.Main;
import java.util.EnumSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class DocLintTest {
    public static void main(String... args) throws Exception {
        new DocLintTest().run();
    }

    JavaCompiler javac;
    StandardJavaFileManager fm;
    JavaFileObject file;

    final String code =
        /* 01 */    "/** Class comment. */\n" +
        /* 02 */    "public class Test {\n" +
        /* 03 */    "    /** Method comment. */\n" +
        /* 04 */    "    public void method() { }\n" +
        /* 05 */    "\n" +
        /* 06 */    "    /** Syntax < error. */\n" +
        /* 07 */    "    private void syntaxError() { }\n" +
        /* 08 */    "\n" +
        /* 09 */    "    /** @see DoesNotExist */\n" +
        /* 10 */    "    protected void referenceError() { }\n" +
        /* 08 */    "\n" +
        /* 09 */    "    /** @return */\n" +
        /* 10 */    "    public int emptyReturn() { return 0; }\n" +
        /* 11 */    "}\n";

    final String rawDiags = "-XDrawDiagnostics";
    private enum Message {
        // doclint messages
        DL_ERR6(ERROR, "Test.java:6:16: compiler.err.proc.messager: malformed HTML"),
        DL_ERR9(ERROR, "Test.java:9:14: compiler.err.proc.messager: reference not found"),
        DL_WRN12(WARNING, "Test.java:12:9: compiler.warn.proc.messager: no description for @return"),

        OPT_BADARG(ERROR, "invalid flag: -Xdoclint:badarg");

        final Diagnostic.Kind kind;
        final String text;

        static Message get(String text) {
            for (Message m: values()) {
                if (m.text.equals(text))
                    return m;
            }
            return null;
        }

        Message(Diagnostic.Kind kind, String text) {
            this.kind = kind;
            this.text = text;
        }

        @Override
        public String toString() {
            return "[" + kind + ",\"" + text + "\"]";
        }
    }
    void run() throws Exception {
        javac = ToolProvider.getSystemJavaCompiler();
        fm = javac.getStandardFileManager(null, null, null);
        fm.setLocation(StandardLocation.CLASS_OUTPUT, Arrays.asList(new File(".")));
        file = new SimpleJavaFileObject(URI.create("Test.java"), JavaFileObject.Kind.SOURCE) {
            @Override
            public CharSequence getCharContent(boolean ignoreEncoding) {
                return code;
            }
        };

        test(Collections.<String>emptyList(),
                Main.Result.OK,
                EnumSet.noneOf(Message.class));

        test(Arrays.asList("-Xdoclint:none"),
                Main.Result.OK,
                EnumSet.noneOf(Message.class));

        test(Arrays.asList(rawDiags, "-Xdoclint"),
                Main.Result.ERROR,
                EnumSet.of(Message.DL_ERR6, Message.DL_ERR9, Message.DL_WRN12));

        test(Arrays.asList(rawDiags, "-Xdoclint:all/public"),
                Main.Result.OK,
                EnumSet.of(Message.DL_WRN12));

        test(Arrays.asList(rawDiags, "-Xdoclint:syntax"),
                Main.Result.ERROR,
                EnumSet.of(Message.DL_ERR6, Message.DL_WRN12));

        test(Arrays.asList(rawDiags, "-Xdoclint:reference"),
                Main.Result.ERROR,
                EnumSet.of(Message.DL_ERR9));

        test(Arrays.asList(rawDiags, "-Xdoclint:badarg"),
                Main.Result.CMDERR,
                EnumSet.of(Message.OPT_BADARG));

        if (errors > 0)
            throw new Exception(errors + " errors occurred");
    }

    void test(List<String> opts, Main.Result expectResult, Set expectMessages) {
        System.err.println("test: " + opts);
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        List<JavaFileObject> files = Arrays.asList(file);
        try {
            JavacTask t = (JavacTask) javac.getTask(pw, fm, null, opts, null, files);
            boolean ok = t.call();
            pw.close();
            String out = sw.toString().replaceAll("[\r\n]+", "\n");
            if (!out.isEmpty())
                System.err.println(out);
            if (ok && expectResult != Main.Result.OK) {
                error("Compilation succeeded unexpectedly");
            } else if (!ok && expectResult != Main.Result.ERROR) {
                error("Compilation failed unexpectedly");
            } else
                check(out, expectMessages);
        } catch (IllegalArgumentException e) {
            System.err.println(e);
            String expectOut = expectMessages.iterator().next().text;
            if (expectResult != Main.Result.CMDERR)
                error("unexpected exception caught");
            else if (!e.getMessage().equals(expectOut)) {
                error("unexpected exception message: "
                        + e.getMessage()
                        + " expected: " + expectOut);
            }
        }

//        if (errors > 0)
//            throw new Error("stop");
    }

    private void check(String out, Set<Message> expect) {
        Pattern stats = Pattern.compile("^([1-9]+) (error|warning)(s?)");
        Set<Message> found = EnumSet.noneOf(Message.class);
        int e = 0, w = 0;
        if (!out.isEmpty()) {
            for (String line: out.split("[\r\n]+")) {
                Matcher s = stats.matcher(line);
                if (s.matches()) {
                    int i = Integer.valueOf(s.group(1));
                    if (s.group(2).equals("error"))
                        e++;
                    else
                        w++;
                    continue;
                }

                Message m = Message.get(line);
                if (m == null)
                    error("Unexpected line: " + line);
                else
                    found.add(m);
            }
        }
        for (Message m: expect) {
            if (!found.contains(m))
                error("expected message not found: " + m.text);
        }
        for (Message m: found) {
            if (!expect.contains(m))
                error("unexpected message found: " + m.text);
        }
    }

    void error(String msg) {
        System.err.println("Error: " + msg);
        errors++;
    }

    int errors;
}