/*

 * 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

 * @summary Test support for union types

 * @library ../../../lib

 */

import java.net.URI;

import java.util.*;

import javax.annotation.processing.*;

import javax.lang.model.element.*;

import javax.lang.model.type.*;

import javax.lang.model.util.*;

import javax.tools.*;

import com.sun.source.tree.*;

import com.sun.source.util.*;

public class TestUnionType extends JavacTestingAbstractProcessor {

    enum TestKind {

        SingleType("E1", "E1",

                "VariableTree: E1 e",

                "VariableTree: elem EXCEPTION_PARAMETER e",

                "VariableTree: elem.type DECLARED",

                "VariableTree: elem.type.elem CLASS E1",

                "VariableTree: type DECLARED",

                "VariableTree: type.elem CLASS E1",

                "VariableTree: type.elem.type DECLARED"),

        ValidTypes("E1, E2", "E1 | E2",

                "VariableTree: E1 | E2 e",

                "VariableTree: elem EXCEPTION_PARAMETER e",

                "VariableTree: elem.type UNION Test.E1,Test.E2",

                "VariableTree: elem.type.elem null",

                "VariableTree: type UNION Test.E1,Test.E2",

                "VariableTree: type.elem null"),

        InvalidTypes("E1, E2", "E1 | EMissing",

                "VariableTree: E1 | EMissing e",

                "VariableTree: elem EXCEPTION_PARAMETER e",

                "VariableTree: elem.type UNION Test.E1,EMissing",

                "VariableTree: elem.type.elem null",

                "VariableTree: type UNION Test.E1,EMissing",

                "VariableTree: type.elem null"),

        Uncaught("E1", "E1 | E2",

                "VariableTree: E1 | E2 e",

                "VariableTree: elem EXCEPTION_PARAMETER e",

                "VariableTree: elem.type UNION Test.E1,Test.E2",

                "VariableTree: elem.type.elem null",

                "VariableTree: type UNION Test.E1,Test.E2",

                "VariableTree: type.elem null");

        TestKind(String throwsTypes, String catchTypes, String... gold) {

            this.throwsTypes = throwsTypes;

            this.catchTypes = catchTypes;

            this.gold = Arrays.asList(gold);

        }

        final String throwsTypes;

        final String catchTypes;

        final List<String> gold;

    }

    static class TestFileObject extends SimpleJavaFileObject {

        public static final String template =

                  "class Test {\n"

                + "    class E1 extends Exception { }\n"

                + "    class E2 extends Exception { }\n"

                + "    void doSomething() throws #T { }\n"

                + "    void test() {\n"

                + "        try {\n"

                + "            doSomething();\n"

                + "        } catch (#C e) {\n"

                + "        }\n"

                + "    }\n"

                + "}\n";

        public TestFileObject(TestKind tk) {

            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

            this.tk = tk;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return template

                    .replace("#T", tk.throwsTypes)

                    .replace("#C", tk.catchTypes);

        }

        final TestKind tk;

    }

    public static void main(String... args) throws Exception {

        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();

        List<String> options = Arrays.asList("-proc:only");

        for (TestKind tk: TestKind.values()) {

            System.err.println("Test: " + tk);

            TestUnionType p = new TestUnionType();

            JavaFileObject fo = new TestFileObject(tk);

            JavaCompiler.CompilationTask task = comp.getTask(null, null, null, options, null, Arrays.asList(fo));

            task.setProcessors(Arrays.asList(p));

            boolean ok = task.call();

            System.err.println("compilation " + (ok ? "passed" : "failed"));

            if (!ok)

                throw new Exception("compilation failed unexpectedly");

            if (!p.log.equals(tk.gold)) {

                System.err.println("Expected output:");

                for (String g: tk.gold)

                    System.err.println(g);

                throw new Exception("unexpected output from test");

            }

            System.err.println();

        }

    }

    Trees trees;

    List<String> log;

    @Override

    public void init(ProcessingEnvironment env) {

        super.init(env);

        trees = Trees.instance(env);

        log = new ArrayList<String>();

    }

    @Override

    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

        if (!roundEnv.processingOver()) {

            for (Element e: roundEnv.getRootElements()) {

                scan(trees.getPath(e));

            }

        }

        return true;

    }

    void scan(TreePath path) {

        new Scanner().scan(path, null);

    }

    class Scanner extends TreePathScanner<Void,Void> {

        @Override

        public Void visitVariable(VariableTree tree, Void ignore) {

            TreePath p = getCurrentPath();

            Element e = trees.getElement(p);

            if (e.getKind() == ElementKind.EXCEPTION_PARAMETER) {

                log("VariableTree: " + tree);

                log("VariableTree: elem " + print(e));

                log("VariableTree: elem.type " + print(e.asType()));

                log("VariableTree: elem.type.elem " + print(types.asElement(e.asType())));

                TypeMirror tm = trees.getTypeMirror(p);

                log("VariableTree: type " + print(tm));

                log("VariableTree: type.elem " + print(types.asElement(tm)));

                if (types.asElement(tm) != null)

                    log("VariableTree: type.elem.type " + print(types.asElement(tm).asType()));

            }

            return super.visitVariable(tree, null);

        }

        String print(TypeMirror tm) {

            return (tm == null) ? null : new TypePrinter().visit(tm);

        }

        String print(Element e) {

            return (e == null) ? null : (e.getKind() + " " + e.getSimpleName());

        }

        void log(String msg) {

            System.err.println(msg);

            log.add(msg);

        }

    }

        @Override

        protected String defaultAction(TypeMirror tm, Void ignore) {

            return String.valueOf(tm.getKind());

        }

        @Override

        public String visitUnion(UnionType t, Void ignore) {

            return (t.getKind() + " " + t.getAlternatives());

        }

    }

}