import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.Arrays;
+import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Objects;
+import java.util.Set;
import java.util.regex.Pattern;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
* @param requiredClass Required item class
* @param fieldName name of the field being filled
* @param list List, which items should be checked
+ * @return Type-checked List
* @throws IllegalArgumentException if a list item is not instance of {@code requiredItemClass}
* @throws NullPointerException if {@code requiredClass} or {@code fieldName} is null
*/
@SuppressWarnings("unchecked")
public static <T> @Nullable List<T> checkListFieldCast(final @NonNull Class<?> requiredClass,
final @NonNull String fieldName, final @Nullable List<?> list) {
- if (list != null) {
+ checkCollectionField(requiredClass, fieldName, list);
+ return (List<T>) list;
+ }
+
+ /**
+ * Utility method for checking whether the items of target list is compatible.
+ *
+ * @param requiredClass Required item class
+ * @param fieldName name of the field being filled
+ * @param set Set, which items should be checked
+ * @return Type-checked Set
+ * @throws IllegalArgumentException if a set item is not instance of {@code requiredItemClass}
+ * @throws NullPointerException if {@code requiredClass} or {@code fieldName} is null
+ */
+ @SuppressWarnings("unchecked")
+ public static <T> @Nullable Set<T> checkSetFieldCast(final @NonNull Class<?> requiredClass,
+ final @NonNull String fieldName, final @Nullable Set<?> set) {
+ checkCollectionField(requiredClass, fieldName, set);
+ return (Set<T>) set;
+ }
+
+ private static void checkCollectionField(final @NonNull Class<?> requiredClass,
+ final @NonNull String fieldName, final @Nullable Collection<?> collection) {
+ if (collection != null) {
try {
- list.forEach(item -> requiredClass.cast(requireNonNull(item)));
+ collection.forEach(item -> requiredClass.cast(requireNonNull(item)));
} catch (ClassCastException | NullPointerException e) {
throw new IllegalArgumentException("Invalid input list item for property \"" + requireNonNull(fieldName)
+ "\"", e);
}
}
- return (List<T>) list;
}
/**