import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
/**
 * Returns an optional archive containing the given Location
 */
public Optional<Archive> findClass(Dependency.Location location) {
    String name = location.getName();
    int i = name.lastIndexOf('/');
    String pn = i > 0 ? name.substring(0, i).replace('/', '.') : "";
    Archive archive = packageToModule.get(pn);
    if (archive != null) {
        return archive.contains(name + ".class")
                    ? Optional.of(archive)
                    : Optional.empty();
    }

    if (packageToUnnamedModule.containsKey(pn)) {
        return packageToUnnamedModule.get(pn).stream()
                .filter(a -> a.contains(name + ".class"))
                .findFirst();
    }
    return Optional.empty();
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
@Override
public boolean accepts(Dependency d) {
    if (d.getOrigin().equals(d.getTarget()))
        return false;

    // filter same package dependency
    String pn = d.getTarget().getPackageName();
    if (filterSamePackage && d.getOrigin().getPackageName().equals(pn)) {
        return false;
    }

    // filter if the target package matches the given filter
    if (filterPattern != null && filterPattern.matcher(pn).matches()) {
        return false;
    }

    // filter if the target matches the given filtered package name or regex
    return filter != null ? filter.accepts(d) : true;
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
private JdepsFilter(Dependency.Filter filter,
                    Pattern filterPattern,
                    boolean filterSamePackage,
                    boolean filterSameArchive,
                    boolean findJDKInternals,
                    Pattern includePattern,
                    Pattern includeSystemModules,
                    Set<String> requires) {
    this.filter = filter;
    this.filterPattern = filterPattern;
    this.filterSamePackage = filterSamePackage;
    this.filterSameArchive = filterSameArchive;
    this.findJDKInternals = findJDKInternals;
    this.includePattern = includePattern;
    this.includeSystemModules = includeSystemModules;
    this.requires = requires;
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
public JdepsFilter build() {
    Dependency.Filter filter = null;
    if (regex != null)
        filter = Dependencies.getRegexFilter(regex);
    else if (!targetPackages.isEmpty()) {
        filter = Dependencies.getPackageFilter(targetPackages, false);
    }
    return new JdepsFilter(filter,
                           filterPattern,
                           filterSamePackage,
                           filterSameArchive,
                           findJDKInterals,
                           includePattern,
                           includeSystemModules,
                           requires);
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
@Override
public boolean accepts(Dependency d) {
    if (d.getOrigin().equals(d.getTarget())) {
        return false;
    }
    String pn = d.getTarget().getPackageName();
    if (options.filterSamePackage && d.getOrigin().getPackageName().equals(pn)) {
        return false;
    }

    if (filterPattern != null && filterPattern.matcher(pn).matches()) {
        return false;
    }
    return filter != null ? filter.accepts(d) : true;
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
/**
 * Analyze the dependencies of all classes in the given JAR file. The
 * method updates knownTypes and unknownRefs as part of the analysis.
 */
static void analyzeDependencies(Path jarpath) throws Exception {
    System.out.format("Analyzing %s%n", jarpath);
    try (JarFile jf = new JarFile(jarpath.toFile())) {
        Enumeration<JarEntry> entries = jf.entries();
        while (entries.hasMoreElements()) {
            JarEntry e = entries.nextElement();
            String name = e.getName();
            if (name.endsWith(".class")) {
                ClassFile cf = ClassFile.read(jf.getInputStream(e));
                for (Dependency d : finder.findDependencies(cf)) {
                    String origin = toClassName(d.getOrigin().getName());
                    String target = toClassName(d.getTarget().getName());

                    // origin is now known
                    unknownRefs.remove(origin);
                    knownTypes.add(origin);

                    // if the target is not known then record the reference
                    if (!knownTypes.contains(target)) {
                        Set<String> refs = unknownRefs.get(target);
                        if (refs == null) {
                            // first time seeing this unknown type
                            refs = new HashSet<>();
                            unknownRefs.put(target, refs);
                        }
                        refs.add(origin);
                    }
                }
            }
        }
    }
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
private Set<Location> parse(Archive archive, Finder finder, String name)
    throws IOException
{
    ClassFile cf = archive.reader().getClassFile(name);
    if (cf == null) {
        throw new IllegalArgumentException(archive.getName() +
            " does not contain " + name);
    }

    if (cf.access_flags.is(AccessFlags.ACC_MODULE))
        return Collections.emptySet();

    Set<Location> targets = new HashSet<>();
    String cn;
    try {
        cn =  cf.getName().replace('/', '.');
    } catch (ConstantPoolException e) {
        throw new Dependencies.ClassFileError(e);
    }

    if (!finder.accept(archive, cn, cf.access_flags))
        return targets;

    // tests if this class matches the -include
    if (!filter.matches(cn))
        return targets;

    // skip checking filter.matches
    for (Dependency d : finder.findDependencies(cf)) {
        if (filter.accepts(d)) {
            targets.add(d.getTarget());
            archive.addClass(d.getOrigin(), d.getTarget());
        } else {
            // ensure that the parsed class is added the archive
            archive.addClass(d.getOrigin());
        }
        parsedClasses.putIfAbsent(d.getOrigin(), archive);
    }
    return targets;
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
private JdepsFilter(Dependency.Filter filter,
                    Pattern filterPattern,
                    boolean filterSamePackage,
                    boolean filterSameArchive,
                    boolean findJDKInternals,
                    Pattern includePattern,
                    Set<String> requires) {
    this.filter = filter;
    this.filterPattern = filterPattern;
    this.filterSamePackage = filterSamePackage;
    this.filterSameArchive = filterSameArchive;
    this.findJDKInternals = findJDKInternals;
    this.includePattern = includePattern;
    this.requires = requires;
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
public JdepsFilter build() {
    Dependency.Filter filter = null;
    if (regex != null)
        filter = Dependencies.getRegexFilter(regex);
    else if (!targetPackages.isEmpty()) {
        filter = Dependencies.getPackageFilter(targetPackages, false);
    }
    return new JdepsFilter(filter,
                           filterPattern,
                           filterSamePackage,
                           filterSameArchive,
                           findJDKInterals,
                           includePattern,
                           requires);
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
private Set<Location> parse(Archive archive, Finder finder, String name)
    throws IOException
{
    ClassFile cf = archive.reader().getClassFile(name);
    if (cf == null) {
        throw new IllegalArgumentException(archive.getName() + " does not contain " + name);
    }

    Set<Location> targets = new HashSet<>();
    String cn;
    try {
        cn =  cf.getName().replace('/', '.');
    } catch (ConstantPoolException e) {
        throw new Dependencies.ClassFileError(e);
    }

    if (!finder.accept(archive, cn, cf.access_flags))
        return targets;

    // tests if this class matches the -include
    if (!filter.matches(cn))
        return targets;

    // skip checking filter.matches
    for (Dependency d : finder.findDependencies(cf)) {
        if (filter.accepts(d)) {
            targets.add(d.getTarget());
            archive.addClass(d.getOrigin(), d.getTarget());
        } else {
            // ensure that the parsed class is added the archive
            archive.addClass(d.getOrigin());
        }
        parsedClasses.putIfAbsent(d.getOrigin(), archive);
    }
    return targets;
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
private Dependency.Filter getDependencyFilter() {
     if (options.regex != null) {
        return Dependencies.getRegexFilter(Pattern.compile(options.regex));
    } else if (options.packageNames.size() > 0) {
        return Dependencies.getPackageFilter(options.packageNames, false);
    } else {
        return new Dependency.Filter() {
            @Override
            public boolean accepts(Dependency dependency) {
                return !dependency.getOrigin().equals(dependency.getTarget());
            }
        };
    }
}
 

import com.sun.tools.classfile.Dependency; //导入依赖的package包/类
@Override
public Iterable<? extends Dependency> findDependencies(ClassFile classfile) {
    return finder.findDependencies(classfile);
}