To find all classes that extend a base class we are going to use the ClassHunter and, in the following example, we look for all classes who extends java.util.AbstractList:
import java.util.AbstractList;
import java.util.Collection;
import org.burningwave.core.assembler.ComponentContainer;
import org.burningwave.core.assembler.ComponentSupplier;
import org.burningwave.core.classes.ClassCriteria;
import org.burningwave.core.classes.ClassHunter;
import org.burningwave.core.classes.SearchConfig;
import org.burningwave.core.io.PathHelper;
public class Finder {
public Collection<Class<?>> find() {
ComponentSupplier componentSupplier = ComponentContainer.getInstance();
PathHelper pathHelper = componentSupplier.getPathHelper();
ClassHunter classHunter = componentSupplier.getClassHunter();
SearchConfig searchConfig = SearchConfig.forPaths(
//Here you can add all absolute path you want:
//both folders, zip and jar will be recursively scanned.
//For example you can add: "C:\\Users\\user\\.m2"
//With the line below the search will be executed on runtime Classpaths
//(see https://github.com/burningwave/core/wiki/In-depth-look-to-ClassHunter-and-configuration-guide)
pathHelper.getMainClassPaths()
).by(
ClassCriteria.create().byClassesThatMatch((uploadedClasses, currentScannedClass) ->
//[1]here you recall the uploaded class by "useClasses" method. In this case we find all class who extends java.util.AbstractList
uploadedClasses.get(AbstractList.class).isAssignableFrom(currentScannedClass)
).useClasses(
//With this directive we ask the library to load one or more classes to be used for comparisons:
//it serves to eliminate the problem that a class, loaded by different class loaders,
//turns out to be different for the comparison operators (eg. The isAssignableFrom method).
//If you call this method, you must retrieve the uploaded class in all methods that support this feature like in the point[1]
AbstractList.class
)
);
try (ClassHunter.SearchResult searchResult = classHunter.findBy(searchConfig)) {
return searchResult.getClasses();
}
}
}
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