Quelle Annotations.java Sprache: JAVA

/*
* Copyright (c) 2020, 2022, 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 8256266 8281238
* @summary Verify annotations work correctly on binding variables
* @library /tools/javac/lib
* @modules java.compiler
*          jdk.compiler
*          jdk.jdeps/com.sun.tools.classfile
* @build JavacTestingAbstractProcessor
* @compile Annotations.java
* @compile -processor Annotations -proc:only Annotations.java
* @run main Annotations
*/

import com.sun.source.tree.InstanceOfTree;
import com.sun.source.util.TreePath;
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import java.util.Set;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;

import com.sun.source.tree.BindingPatternTree;
import com.sun.source.tree.VariableTree;
import com.sun.source.util.TreePathScanner;
import com.sun.source.util.Trees;
import com.sun.tools.classfile.*;
import java.io.InputStream;
import java.util.Arrays;

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

    void run() throws Exception {
        InputStream annotationsClass =
                Annotations.class.getResourceAsStream("Annotations.class");
        ClassFile cf = ClassFile.read(annotationsClass);
        for (Method m : cf.methods) {
            if ("test".equals(cf.constant_pool.getUTF8Value(m.name_index))) {
                Code_attribute codeAttr =
                        (Code_attribute) m.attributes.map.get(Attribute.Code);
                Attribute annoAttr =
                        codeAttr.attributes.map.get(Attribute.RuntimeInvisibleTypeAnnotations);
                RuntimeInvisibleTypeAnnotations_attribute annotations =
                        (RuntimeInvisibleTypeAnnotations_attribute) annoAttr;
                String expected = "[@Annotations$DTA; pos: [LOCAL_VARIABLE, {start_pc = 31, length = 7, index = 1}, pos = -1], " +
                                  "@Annotations$TA; pos: [LOCAL_VARIABLE, {start_pc = 50, length = 7, index = 1}, pos = -1]]";
                String actual = Arrays.toString(annotations.annotations);
                if (!expected.equals(actual)) {
                    throw new AssertionError("Unexpected type annotations: " +
                                              actual);
                }
            }
        }
    }

    private static void test(Object o) {
        if (o instanceof @DA String da) {
            System.err.println(da);
        }
        if (o instanceof @DTA String dta) {
            System.err.println(dta);
        }
        if (o instanceof @TA String ta) {
            System.err.println(ta);
        }
    }

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        Trees trees = Trees.instance(processingEnv);

        for (Element root : roundEnv.getRootElements()) {
            TreePath tp = trees.getPath(root);
            new TreePathScanner<Void, Void>() {
                @Override
                public Void visitInstanceOf(InstanceOfTree node, Void p) {
                    BindingPatternTree bpt = (BindingPatternTree) node.getPattern();
                    VariableTree var = bpt.getVariable();
                    Element varEl = trees.getElement(new TreePath(getCurrentPath(), var));
                    String expectedDeclAnnos;
                    String expectedType;
                    switch (var.getName().toString()) {
                        case "da" -> {
                            expectedDeclAnnos = "@Annotations.DA";
                            expectedType = "java.lang.String";
                        }
                        case "dta" -> {
                            expectedDeclAnnos = "@Annotations.DTA";
                            expectedType = "java.lang.@Annotations.DTA String";
                        }
                        case "ta" -> {
                            expectedDeclAnnos = "";
                            expectedType = "java.lang.@Annotations.TA String";
                        }
                        default -> {
                            throw new AssertionError("Unexpected variable: " + var);
                        }
                    }
                    String declAnnos = varEl.getAnnotationMirrors().toString();
                    if (!expectedDeclAnnos.equals(declAnnos)) {
                        throw new AssertionError("Unexpected modifiers: " + declAnnos +
                                                  " for: " + var.getName());
                    }
                    TypeMirror varType = varEl.asType();
                    String type = varType.toString();
                    if (!expectedType.equals(type)) {
                        throw new AssertionError("Unexpected type: " + type +
                                                  " for: " + var.getName() + " expected " + expectedType);
                    }
                    return super.visitInstanceOf(node, p);
                }
            }.scan(tp.getCompilationUnit(), null);
        }
        return false;
    }

    @Target(ElementType.LOCAL_VARIABLE)
    @interface DA {}
    @Target({ElementType.TYPE_USE, ElementType.LOCAL_VARIABLE})
    @interface DTA {}
    @Target(ElementType.TYPE_USE)
    @interface TA {}
}

quality85%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.