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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.
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package com.sun.tools.sjavac.comp.dependencies;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.tools.JavaFileManager.Location;
import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
import com.sun.source.util.TaskEvent;
import com.sun.source.util.TaskListener;
import com.sun.tools.javac.code.Kinds.Kind;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.TypeSymbol;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.DefinedBy;
import com.sun.tools.javac.util.DefinedBy.Api;
import com.sun.tools.javac.util.Dependencies.GraphDependencies;
import com.sun.tools.javac.util.Dependencies.GraphDependencies.CompletionNode;
import com.sun.tools.javac.util.GraphUtils.Node;
import com.sun.tools.sjavac.Util;
import com.sun.tools.sjavac.comp.JavaFileObjectWithLocation;
import com.sun.tools.sjavac.comp.PubAPIs;
public class NewDependencyCollector implements TaskListener {
private final Context context;
private final Collection explicitJFOs;
private Map>> deps;
private Map>> cpDeps;
public NewDependencyCollector(Context context,
Collection explicitJFOs) {
this.context = context;
this.explicitJFOs = explicitJFOs;
}
@Override
@DefinedBy(Api.COMPILER_TREE)
public void finished(TaskEvent e) {
if (e.getKind() == TaskEvent.Kind.COMPILATION) {
collectPubApisOfDependencies(context, explicitJFOs);
deps = getDependencies(context, explicitJFOs, false);
cpDeps = getDependencies(context, explicitJFOs, true);
}
}
public Map>> getDependencies(boolean cp) {
return cp ? cpDeps : deps;
}
private Set getDependencyNodes(Context context,
Collection explicitJFOs,
boolean explicits) {
GraphDependencies deps = (GraphDependencies) GraphDependencies.instance(context);
return deps.getNodes()
.stream()
.map(n -> (CompletionNode) n)
.filter(n -> n.getClassSymbol().fullname != null)
.filter(n -> explicits == explicitJFOs.contains(n.getClassSymbol().classfile))
.collect(Collectors.toSet());
}
private void collectPubApisOfDependencies(Context context,
Collection explicitJFOs) {
PubAPIs pubApis = PubAPIs.instance(context);
for (CompletionNode cDepNode : getDependencyNodes(context, explicitJFOs, false)) {
ClassSymbol cs = cDepNode.getClassSymbol().outermostClass();
Location loc = getLocationOf(cs);
// We're completely ignorant of PLATFORM_CLASS_PATH classes
if (loc == StandardLocation.CLASS_PATH || loc == StandardLocation.SOURCE_PATH)
pubApis.visitPubapi(cs);
}
}
private Location getLocationOf(ClassSymbol cs) {
JavaFileObject jfo = cs.outermostClass().classfile;
if (jfo instanceof JavaFileObjectWithLocation javaFileObjectWithLocation) {
return javaFileObjectWithLocation.getLocation();
}
// jfo is most likely on PLATFORM_CLASS_PATH.
// See notes in SmartFileManager::locWrap
return null;
}
// :Package -> fully qualified class name [from] -> set of fully qualified class names [to]
private Map>> getDependencies(Context context,
Collection explicitJFOs,
boolean cp) {
Map>> result = new HashMap<>();
for (CompletionNode cnode : getDependencyNodes(context, explicitJFOs, true)) {
String fqDep = cnode.getClassSymbol().outermostClass().flatname.toString();
String depPkg = Util.pkgNameOfClassName(fqDep);
Map> depsForThisClass = result.get(depPkg);
if (depsForThisClass == null) {
result.put(depPkg, depsForThisClass = new HashMap<>());
}
Set fqDeps = depsForThisClass.get(fqDep);
if (fqDeps == null) {
depsForThisClass.put(fqDep, fqDeps = new HashSet<>());
}
for (Node depNode : getAllDependencies(cnode)) {
CompletionNode cDepNode = (CompletionNode) depNode;
// Symbol is not regarded to depend on itself.
if (cDepNode == cnode) {
continue;
}
// Skip anonymous classes
if (cDepNode.getClassSymbol().fullname == null) {
continue;
}
if (isSymbolRelevant(cp, cDepNode.getClassSymbol())) {
fqDeps.add(cDepNode.getClassSymbol().outermostClass().flatname.toString());
}
}
// The completion dependency graph is not transitively closed for inheritance relations.
// For sjavac's purposes however, a class depends on its super-supertype, so below we
// make sure that we include supertypes.
for (ClassSymbol cs : allSupertypes(cnode.getClassSymbol())) {
if (isSymbolRelevant(cp, cs)) {
fqDeps.add(cs.outermostClass().flatname.toString());
}
}
}
return result;
}
public boolean isSymbolRelevant(boolean cp, ClassSymbol cs) {
Location csLoc = getLocationOf(cs);
Location relevantLocation = cp ? StandardLocation.CLASS_PATH : StandardLocation.SOURCE_PATH;
return csLoc == relevantLocation;
}
private Set allSupertypes(TypeSymbol t) {
if (t == null || !(t instanceof ClassSymbol classSymbol)) {
return Collections.emptySet();
}
Set result = new HashSet<>();
result.add(classSymbol);
result.addAll(allSupertypes(classSymbol.getSuperclass().tsym));
for (Type it : classSymbol.getInterfaces()) {
result.addAll(allSupertypes(it.tsym));
}
return result;
}
private Collection> getAllDependencies(CompletionNode cnode) {
return Stream.of(cnode.getSupportedDependencyKinds())
.flatMap(dk -> cnode.getDependenciesByKind(dk).stream())
.collect(Collectors.toSet());
}
}