Examples with Tag jakarta.servlet.jsp.tagext.Tag used on opensource projects

Example 6 with Tag

use of jakarta.servlet.jsp.tagext.Tag in project spring-framework by spring-projects.

the class TagUtils method hasAncestorOfType.

/**
 * Determine whether the supplied {@link Tag} has any ancestor tag
 * of the supplied type.
 * @param tag the tag whose ancestors are to be checked
 * @param ancestorTagClass the ancestor {@link Class} being searched for
 * @return {@code true} if the supplied {@link Tag} has any ancestor tag
 * of the supplied type
 * @throws IllegalArgumentException if either of the supplied arguments is {@code null};
 * or if the supplied {@code ancestorTagClass} is not type-assignable to
 * the {@link Tag} class
 */
public static boolean hasAncestorOfType(Tag tag, Class<?> ancestorTagClass) {
    Assert.notNull(tag, "Tag cannot be null");
    Assert.notNull(ancestorTagClass, "Ancestor tag class cannot be null");
    if (!Tag.class.isAssignableFrom(ancestorTagClass)) {
        throw new IllegalArgumentException("Class '" + ancestorTagClass.getName() + "' is not a valid Tag type");
    }
    Tag ancestor = tag.getParent();
    while (ancestor != null) {
        if (ancestorTagClass.isAssignableFrom(ancestor.getClass())) {
            return true;
        }
        ancestor = ancestor.getParent();
    }
    return false;
}