Java example source code file (T7003595.java)

This example Java source code file (T7003595.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

anon, arraylist, classkind, error, exception, innerclasses, javasource, net, network, object, string, t7003595, test, util

The T7003595.java Java example source code

/*
 * Copyright (c) 2011, 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 7003595
 * @summary IncompatibleClassChangeError with unreferenced local class with subclass
 */

import com.sun.source.util.JavacTask;
import com.sun.tools.classfile.Attribute;
import com.sun.tools.classfile.ClassFile;
import com.sun.tools.classfile.InnerClasses_attribute;
import com.sun.tools.classfile.ConstantPool.*;
import com.sun.tools.javac.api.JavacTool;

import java.io.File;
import java.net.URI;
import java.util.Arrays;
import java.util.ArrayList;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;


public class T7003595 {

    /** global decls ***/

    // Create a single file manager and reuse it for each compile to save time.
    static StandardJavaFileManager fm = JavacTool.create().getStandardFileManager(null, null, null);

    //statistics
    static int checkCount = 0;

    enum ClassKind {
        NESTED("static class #N { #B }", "$", true),
        INNER("class #N { #B }", "$", false),
        LOCAL_REF("void test() { class #N { #B }; new #N(); }", "$1", false),
        LOCAL_NOREF("void test() { class #N { #B }; }", "$1", false),
        ANON("void test() { new Object() { #B }; }", "$1", false),
        NONE("", "", false);

        String memberInnerStr;
        String sep;
        boolean staticAllowed;

        private ClassKind(String memberInnerStr, String sep, boolean staticAllowed) {
            this.memberInnerStr = memberInnerStr;
            this.sep = sep;
            this.staticAllowed = staticAllowed;
        }

        String getSource(String className, String outerName, String nested) {
            return memberInnerStr.replaceAll("#O", outerName).
                    replaceAll("#N", className).replaceAll("#B", nested);
        }

        static String getClassfileName(String[] names, ClassKind[] outerKinds, int pos) {
            System.out.println(" pos = " + pos + " kind = " + outerKinds[pos] + " sep = " + outerKinds[pos].sep);
            String name = outerKinds[pos] != ANON ?
                    names[pos] : "";
            if (pos == 0) {
                return "Test" + outerKinds[pos].sep + name;
            } else {
                String outerStr = getClassfileName(names, outerKinds, pos - 1);
                return outerStr + outerKinds[pos].sep + name;
            }
        }

        boolean isAllowed(ClassKind nestedKind) {
            return nestedKind != NESTED ||
                    staticAllowed;
        }
    }

    enum LocalInnerClass {
        LOCAL_REF("class L {}; new L();", "Test$1L"),
        LOCAL_NOREF("class L {};", "Test$1L"),
        ANON("new Object() {};", "Test$1"),
        NONE("", "");

        String localInnerStr;
        String canonicalInnerStr;

        private LocalInnerClass(String localInnerStr, String canonicalInnerStr) {
            this.localInnerStr = localInnerStr;
            this.canonicalInnerStr = canonicalInnerStr;
        }
    }

    public static void main(String... args) throws Exception {
        for (ClassKind ck1 : ClassKind.values()) {
            String cname1 = "C1";
            for (ClassKind ck2 : ClassKind.values()) {
                if (!ck1.isAllowed(ck2)) continue;
                String cname2 = "C2";
                for (ClassKind ck3 : ClassKind.values()) {
                    if (!ck2.isAllowed(ck3)) continue;
                    String cname3 = "C3";
                    new T7003595(new ClassKind[] {ck1, ck2, ck3}, new String[] { cname1, cname2, cname3 }).compileAndCheck();
                }
            }
        }

        System.out.println("Total checks made: " + checkCount);
    }

    /** instance decls **/

    ClassKind[] cks;
    String[] cnames;

    T7003595(ClassKind[] cks, String[] cnames) {
        this.cks = cks;
        this.cnames = cnames;
    }

    void compileAndCheck() throws Exception {
        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
        JavaSource source = new JavaSource();
        JavacTask ct = (JavacTask)tool.getTask(null, fm, null,
                null, null, Arrays.asList(source));
        ct.call();
        verifyBytecode(source);
    }

    void verifyBytecode(JavaSource source) {
        for (int i = 0; i < 3 ; i ++) {
            if (cks[i] == ClassKind.NONE) break;
            checkCount++;
            String filename = cks[i].getClassfileName(cnames, cks, i);
            File compiledTest = new File(filename + ".class");
            try {
                ClassFile cf = ClassFile.read(compiledTest);
                if (cf == null) {
                    throw new Error("Classfile not found: " + filename);
                }

                InnerClasses_attribute innerClasses = (InnerClasses_attribute)cf.getAttribute(Attribute.InnerClasses);

                ArrayList<String> foundInnerSig = new ArrayList<>();
                if (innerClasses != null) {
                    for (InnerClasses_attribute.Info info : innerClasses.classes) {
                        String foundSig = info.getInnerClassInfo(cf.constant_pool).getName();
                        foundInnerSig.add(foundSig);
                    }
                }

                ArrayList<String> expectedInnerSig = new ArrayList<>();
                //add inner class (if any)
                if (i < 2 && cks[i + 1] != ClassKind.NONE) {
                    expectedInnerSig.add(cks[i + 1].getClassfileName(cnames, cks, i + 1));
                }
                //add inner classes
                for (int j = 0 ; j != i + 1 && j < 3; j++) {
                    expectedInnerSig.add(cks[j].getClassfileName(cnames, cks, j));
                }

                if (expectedInnerSig.size() != foundInnerSig.size()) {
                    throw new Error("InnerClasses attribute for " + cnames[i] + " has wrong size\n" +
                                    "expected " + expectedInnerSig.size() + "\n" +
                                    "found " + innerClasses.number_of_classes + "\n" +
                                    source);
                }

                for (String foundSig : foundInnerSig) {
                    if (!expectedInnerSig.contains(foundSig)) {
                        throw new Error("InnerClasses attribute for " + cnames[i] + " has unexpected signature: " +
                                foundSig + "\n" + source + "\n" + expectedInnerSig);
                    }
                }

                for (String expectedSig : expectedInnerSig) {
                    if (!foundInnerSig.contains(expectedSig)) {
                        throw new Error("InnerClasses attribute for " + cnames[i] + " does not contain expected signature: " +
                                    expectedSig + "\n" + source);
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
                throw new Error("error reading " + compiledTest +": " + e);
            }
        }
    }

    class JavaSource extends SimpleJavaFileObject {

        static final String source_template = "class Test { #C }";

        String source;

        public JavaSource() {
            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
            String c3 = cks[2].getSource(cnames[2], cnames[1], "");
            String c2 = cks[1].getSource(cnames[1], cnames[0], c3);
            String c1 = cks[0].getSource(cnames[0], "Test", c2);
            source = source_template.replace("#C", c1);
        }

        @Override
        public String toString() {
            return source;
        }

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