Java example source code file (IntersectionTypeParserTest.java)

This example Java source code file (IntersectionTypeParserTest.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

arraykind, castkind, diagnosticchecker, exception, intersectiontypeparsertest, javasource, net, network, single, standardjavafilemanager, string, type, typekind, util, wildcard

The IntersectionTypeParserTest.java Java example source code

/*
 * Copyright (c) 2012, 2013, 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 8002099
 * @summary Add support for intersection types in cast expression
 */

import com.sun.source.util.JavacTask;
import java.net.URI;
import java.util.Arrays;
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 IntersectionTypeParserTest {

    static int checkCount = 0;

    enum TypeKind {
        SIMPLE("A"),
        GENERIC("A<X>"),
        WILDCARD("A<? super X, ? extends Y>");

        String typeStr;

        TypeKind(String typeStr) {
            this.typeStr = typeStr;
        }
    }

    enum ArrayKind {
        NONE(""),
        SINGLE("[]"),
        DOUBLE("[][]");

        String arrStr;

        ArrayKind(String arrStr) {
            this.arrStr = arrStr;
        }
    }

    static class Type {
        TypeKind tk;
        ArrayKind ak;

        Type(TypeKind tk, ArrayKind ak) {
            this.tk = tk;
            this.ak = ak;
        }

        String asString() {
            return tk.typeStr + ak.arrStr;
        }
    }

    enum CastKind {
        ONE("(#T0)", 1),
        TWO("(#T0 & T1)", 2),
        THREE("(#T0 & #T1 & #T2)", 3);

        String castTemplate;
        int nBounds;

        CastKind(String castTemplate, int nBounds) {
            this.castTemplate = castTemplate;
            this.nBounds = nBounds;
        }

        String asString(Type... types) {
            String res = castTemplate;
            for (int i = 0; i < nBounds ; i++) {
                res = res.replaceAll(String.format("#T%d", i), types[i].asString());
            }
            return res;
        }
    }

    public static void main(String... args) throws Exception {
        //create default shared JavaCompiler - reused across multiple compilations
        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);

        for (CastKind ck : CastKind.values()) {
            for (TypeKind t1 : TypeKind.values()) {
                for (ArrayKind ak1 : ArrayKind.values()) {
                    Type typ1 = new Type(t1, ak1);
                    if (ck.nBounds == 1) {
                        new IntersectionTypeParserTest(ck, typ1).run(comp, fm);
                        continue;
                    }
                    for (TypeKind t2 : TypeKind.values()) {
                        for (ArrayKind ak2 : ArrayKind.values()) {
                            Type typ2 = new Type(t2, ak2);
                            if (ck.nBounds == 2) {
                                new IntersectionTypeParserTest(ck, typ1, typ2).run(comp, fm);
                                continue;
                            }
                            for (TypeKind t3 : TypeKind.values()) {
                                for (ArrayKind ak3 : ArrayKind.values()) {
                                    Type typ3 = new Type(t3, ak3);
                                    new IntersectionTypeParserTest(ck, typ1, typ2, typ3).run(comp, fm);
                                }
                            }
                        }
                    }
                }
            }
        }
        System.out.println("Total check executed: " + checkCount);
    }

    CastKind ck;
    Type[] types;
    JavaSource source;
    DiagnosticChecker diagChecker;

    IntersectionTypeParserTest(CastKind ck, Type... types) {
        this.ck = ck;
        this.types = types;
        this.source = new JavaSource();
        this.diagChecker = new DiagnosticChecker();
    }

    class JavaSource extends SimpleJavaFileObject {

        String bodyTemplate = "class Test {\n" +
                              "   void test() {\n" +
                              "      Object o = #Cnull;\n" +
                              "   } }";

        String source = "";

        public JavaSource() {
            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
            source += bodyTemplate.replaceAll("#C", ck.asString(types));
        }

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

    void run(JavaCompiler tool, StandardJavaFileManager fm) throws Exception {
        checkCount++;
        JavacTask ct = (JavacTask)tool.getTask(null, fm, diagChecker,
                null, null, Arrays.asList(source));
        ct.parse();
        if (diagChecker.errorFound) {
            throw new Error("Unexpected parser error for source:\n" +
                source.getCharContent(true));
        }
    }

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

        boolean errorFound;

        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
            if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
                errorFound = true;
            }
        }
    }
}