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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

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 * 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).

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/*

 * @test

 * @bug 8056258 8048609

 * @summary Ensures that the DependencyCollector covers various cases.

 * @library /tools/lib

 * @build Wrapper ToolBox

 * @run main Wrapper DependencyCollection

 */

import java.io.PrintWriter;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Arrays;

import java.util.Comparator;

import java.util.HashSet;

import java.util.Set;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import java.util.stream.Collectors;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.ToolProvider;

import com.sun.tools.javac.api.JavacTaskImpl;

import com.sun.tools.javac.code.Symbol.PackageSymbol;

import com.sun.tools.sjavac.comp.SmartFileManager;

import com.sun.tools.sjavac.comp.dependencies.DependencyCollector;

public class DependencyCollection {

    public static void main(String[] args) {

        Path src = Paths.get(ToolBox.testSrc, "test-input", "src");

        JavaCompiler javac = ToolProvider.getSystemJavaCompiler();

        StandardJavaFileManager fileManager = javac.getStandardFileManager(null, null, null);

        SmartFileManager smartFileManager = new SmartFileManager(fileManager);

        smartFileManager.setSymbolFileEnabled(false);

        Iterable<? extends JavaFileObject> fileObjects =

                fileManager.getJavaFileObjectsFromFiles(Arrays.asList(src.resolve("pkg/Test.java").toFile()));

        JavacTaskImpl task = (JavacTaskImpl) javac.getTask(new PrintWriter(System.out),

                                                           smartFileManager,

                                                           null,

                                                           Arrays.asList("-d", "classes",

                                                                         "-sourcepath", src.toAbsolutePath().toString()),

                                                           null,

                                                           fileObjects);

        DependencyCollector depsCollector = new DependencyCollector();

        task.addTaskListener(depsCollector);

        task.doCall();

        // Find pkg symbol

        PackageSymbol pkg = findPkgSymbolWithName(depsCollector.getSourcePackages(), "pkg");

        Set<PackageSymbol> foundDependencies = depsCollector.getDependenciesForPkg(pkg);

        // Print dependencies

        System.out.println("Found dependencies:");

        foundDependencies.stream()

                         .sorted(Comparator.comparing(DependencyCollection::extractNumber))

                         .forEach(p -> System.out.println("    " + p));

        // Check result

        Set<Integer> found = foundDependencies.stream()

                                              .map(DependencyCollection::extractNumber)

                                              .collect(Collectors.toSet());

        found.remove(-1); // Dependencies with no number (java.lang etc)

        Set<Integer> expected = new HashSet<>();

        for (int i = 2; i <= 30; i++) {

            if (i == 15) continue;  // Case 15 correspond to the type of a throw-away return value.

            expected.add(i);

        }

        Set<Integer> missing = new HashSet<>(expected);

        missing.removeAll(found);

        if (missing.size() > 0) {

            System.out.println("Missing dependencies:");

            missing.forEach(i -> System.out.println("    Dependency " + i));

        }

        Set<Integer> unexpected = new HashSet<>(found);

        unexpected.removeAll(expected);

        if (unexpected.size() > 0) {

            System.out.println("Unexpected dependencies found:");

            unexpected.forEach(i -> System.out.println("    Dependency " + i));

        }

        if (missing.size() > 0 || unexpected.size() > 0)

            throw new AssertionError("Missing and/or unexpected dependencies found.");

    }

    private static PackageSymbol findPkgSymbolWithName(Set<PackageSymbol> syms, String name) {

        for (PackageSymbol ps : syms)

            if (ps.fullname.toString().equals("pkg"))

                return ps;

        throw new AssertionError("Could not find package named \"pkg\".");

    }

    public static int extractNumber(PackageSymbol p) {

        Matcher m = Pattern.compile("\\d+").matcher(p.fullname.toString());

        if (!m.find())

            return -1;

        return Integer.parseInt(m.group());

    }

}