MobileInterceptor

/**
 * User: mcucchiara
 */
public class MobileInterceptor extends AbstractInterceptor {

    public static final Pattern MOBILE_PATTERN = Pattern.compile(".*(iphone|ipod|android.*mobile|webos|netfront|opera mini|semc-browser|playstation portable|nintendo wii|blackberry).*");

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {

        String viewType = getViewTypeFromCookie();
        if (viewType == null) {
            viewType = getViewTypeFromRequest();
        }
        if (viewType == null) {
            viewType = getViewTypeFromUserAgent();
        }

        //put the value inside the valueStack
        ValueStack stack = invocation.getStack();
        stack.getContext().put(AppConstants.VIEW_TYPE, viewType);
        Object action = invocation.getAction();
        if (action instanceof ViewFolderAware) {
            ((ViewFolderAware) action).setViewFolder(viewType);
        }
        return invocation.invoke();

    }

    private String getViewTypeFromUserAgent() {
        String userAgent = ServletActionContext.getRequest().getHeader("User-Agent");
        if (userAgent != null) {
            Matcher m = MOBILE_PATTERN.matcher(userAgent.toLowerCase());
            if (m.matches()) {
                return AppConstants.MOBILE_VIEW;
            }
        }
        return AppConstants.DEFAULT_VIEW;
    }
}