import javax.servlet.HttpMethodConstraintElement; //导入依赖的package包/类
@Override
public Set<String> setServletSecurity(final ServletSecurityElement constraint) {
    if (constraint == null) {
        throw UndertowMessages.MESSAGES.argumentCannotBeNull("constraint");
    }
    DeploymentInfo deploymentInfo = deployment.getDeploymentInfo();

    //this is not super efficient, but it does not really matter
    final Set<String> urlPatterns = new HashSet<>();
    for (SecurityConstraint sc : deploymentInfo.getSecurityConstraints()) {
        for (WebResourceCollection webResources : sc.getWebResourceCollections()) {
            urlPatterns.addAll(webResources.getUrlPatterns());
        }
    }
    final Set<String> ret = new HashSet<>();
    for (String url : servletInfo.getMappings()) {
        if (urlPatterns.contains(url)) {
            ret.add(url);
        }
    }
    ServletSecurityInfo info = new ServletSecurityInfo();
    servletInfo.setServletSecurityInfo(info);
    info.setTransportGuaranteeType(constraint.getTransportGuarantee() == CONFIDENTIAL ? TransportGuaranteeType.CONFIDENTIAL : TransportGuaranteeType.NONE)
            .setEmptyRoleSemantic(emptyRoleSemantic(constraint.getEmptyRoleSemantic()))
            .addRolesAllowed(constraint.getRolesAllowed());

    for (final HttpMethodConstraintElement methodConstraint : constraint.getHttpMethodConstraints()) {
        info.addHttpMethodSecurityInfo(new HttpMethodSecurityInfo()
                .setTransportGuaranteeType(methodConstraint.getTransportGuarantee() == CONFIDENTIAL ? TransportGuaranteeType.CONFIDENTIAL : TransportGuaranteeType.NONE)
                .setMethod(methodConstraint.getMethodName())
                .setEmptyRoleSemantic(emptyRoleSemantic(methodConstraint.getEmptyRoleSemantic()))
                .addRolesAllowed(methodConstraint.getRolesAllowed()));
    }
    return ret;
}