Java example source code file (T7142086.java)

This example Java source code file (T7142086.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

ansource, arraylist, assertionerror, charsequence, diagnosticchecker, exception, n_methods, net, network, override, simplejavafileobject, string, stringbuilder, t7142086, testclass, util

The T7142086.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 7142086
 * @summary performance problem in Check.checkOverrideClashes(...)
 * @run main/timeout=10 T7142086
 */

import com.sun.source.util.JavacTask;
import java.net.URI;
import java.util.List;
import java.util.ArrayList;
import java.util.Locale;
import javax.tools.Diagnostic;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

public class T7142086 {

    final static int N_METHODS = 1000;

    static class TestClass extends SimpleJavaFileObject {

        String methTemplate = "abstract void m(A#N p);";
        String classTemplate = "abstract class Test { #M }";

        String source;

        public TestClass() {
            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
            StringBuilder buf = new StringBuilder();
            for (int i = 0 ; i < N_METHODS ; i++) {
                buf.append(methTemplate.replace("#N", String.valueOf(i)));
                buf.append("\n");
            }
            source = classTemplate.replace("#M", buf.toString());
        }

        @Override
        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
            return source;
        }
    }

    static class AnSource extends SimpleJavaFileObject {

        String classTemplate = "abstract class A#N { }";

        String source;

        public AnSource(int n) {
            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
            source = classTemplate.replace("#N", String.valueOf(n));
        }

        @Override
        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
            return source;
        }
    }

    public static void main(String... args) throws Exception {
        ArrayList<JavaFileObject> sources = new ArrayList<>();
        for (int i = 0 ; i < N_METHODS ; i++) {
            sources.add(new AnSource(i));
        }
        sources.add(new TestClass());
        new T7142086().run(sources);
    }

    void run(List<JavaFileObject> sources) throws Exception {
        DiagnosticChecker dc = new DiagnosticChecker();
        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);
        JavacTask ct = (JavacTask)comp.getTask(null, fm, dc,
                null, null, sources);
        ct.analyze();
    }

    static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {

        boolean errorFound;

        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
            if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
                throw new AssertionError("unexpected diagnostic: " + diagnostic.getMessage(Locale.getDefault()));
            }
        }
    }
}