com.intellij.psi.PsiClass#EMPTY_ARRAY源码实例Demo

@Override
public PsiClass[] findClasses(String qualifiedName, GlobalSearchScope scope) {
  final PsiClass component = findClassInternal(qualifiedName, scope, project);
  if (component == null) {
    return PsiClass.EMPTY_ARRAY;
  }
  return new PsiClass[] {component};
}
 

@Override
public PsiClass[] getClasses(PsiPackage psiPackage, GlobalSearchScope scope) {
  if (!scope.contains(dummyFile)) return PsiClass.EMPTY_ARRAY;

  // We don't create own package, but provide additional classes to existing one
  final String packageQN = psiPackage.getQualifiedName();
  return Arrays.stream(ComponentsCacheService.getInstance(project).getAllComponents())
      .filter(cls -> StringUtil.getPackageName(cls.getQualifiedName()).equals(packageQN))
      .toArray(PsiClass[]::new);
}
 

@Override
public PsiClass[] getClassesByName(String name, GlobalSearchScope scope) {
  if (!scope.contains(dummyFile)) return PsiClass.EMPTY_ARRAY;

  return Arrays.stream(ComponentsCacheService.getInstance(project).getAllComponents())
      .filter(
          cls -> {
            final String shortName = StringUtil.getShortName(cls.getQualifiedName());
            return shortName.equals(name);
          })
      .toArray(PsiClass[]::new);
}
 

public static PsiClass[] findClasses(Project project, String qualifiedName) {
  final PsiClass found = findClass(project, qualifiedName);
  if (found == null) {
    return PsiClass.EMPTY_ARRAY;
  }
  return new PsiClass[] {found};
}
 

protected static PsiClass[] getSuperTypesAsArray(PsiClass theClass) {
  if (!theClass.isValid()) return PsiClass.EMPTY_ARRAY;
  final ArrayList<PsiClass> allSuperClasses = getSuperTypesAsList(theClass);
  return allSuperClasses.toArray(new PsiClass[allSuperClasses.size()]);
}
 

@NotNull
@Override
public PsiClass[] findClasses(@NotNull String qualifiedName, @NotNull GlobalSearchScope scope) {
  return PsiClass.EMPTY_ARRAY;
}