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package org.junit.experimental.categories;

import java.util.ArrayList;
import java.util.List;

import org.junit.internal.Classes;
import org.junit.runner.FilterFactory;
import org.junit.runner.FilterFactoryParams;
import org.junit.runner.manipulation.Filter;

/**
 * Implementation of FilterFactory for Category filtering.
 */
abstract class CategoryFilterFactory implements FilterFactory {
    /**
     * Creates a {@link org.junit.experimental.categories.Categories.CategoryFilter} given a
     * {@link FilterFactoryParams} argument.
     *
     * @param params Parameters needed to create the {@link Filter}
     */
    public Filter createFilter(FilterFactoryParams params) throws FilterNotCreatedException {
        try {
            return createFilter(parseCategories(params.getArgs()));
        } catch (ClassNotFoundException e) {
            throw new FilterNotCreatedException(e);
        }
    }

    /**
     * Creates a {@link org.junit.experimental.categories.Categories.CategoryFilter} given an array of classes.
     *
     * @param categories Category classes.
     */
    protected abstract Filter createFilter(List> categories);

    private List> parseCategories(String categories) throws ClassNotFoundException {
        List> categoryClasses = new ArrayList>();

        for (String category : categories.split(",")) {
            Class categoryClass = Classes.getClass(category);

            categoryClasses.add(categoryClass);
        }

        return categoryClasses;
    }
}