javax.ws.rs.core.Variant#getEncoding()源码实例Demo

private boolean verifyVariant(List<Variant> vs, Variant var) {
    for (Variant v : vs) {

        if (v.getLanguage() == null
            && v.getEncoding() == null
            && v.getMediaType() == null) {
            return false;
        }
        boolean encodCheck = v.getEncoding() == null && var.getEncoding() == null
                             || v.getEncoding().equals(var.getEncoding());
        boolean langCheck = v.getLanguage() == null && var.getLanguage() == null
                            || v.getLanguage().equals(var.getLanguage());
        boolean typeCheck = v.getMediaType() == null && var.getMediaType() == null
                            || v.getMediaType().equals(var.getMediaType());
        if (encodCheck && langCheck && typeCheck) {
            return true;
        }
    }

    return false;
}
 

private static boolean hasMatchingEncoding(Variant supported, Variant required) {
	String requiredEncoding = required.getEncoding();
	String supportedEncoding = supported.getEncoding();
	return
		requiredEncoding==null ||
		supportedEncoding==null ||
		supportedEncoding.equals(requiredEncoding);
}
 

private static String getEncoding(Variant v) {
	String encoding = v.getEncoding();
	if(encoding==null) {
		encoding="*";
	}
	return encoding;
}
 

public Variant selectVariant(List<Variant> vars) throws IllegalArgumentException {
    if (vars == null || vars.isEmpty()) {
        throw new IllegalArgumentException("List of Variants is either null or empty");
    }
    List<MediaType> acceptMediaTypes = headers.getAcceptableMediaTypes();
    List<Locale> acceptLangs = headers.getAcceptableLanguages();
    List<String> acceptEncs = parseAcceptEnc(
        headers.getRequestHeaders().getFirst(HttpHeaders.ACCEPT_ENCODING));
    List<Variant> requestVariants = sortAllCombinations(acceptMediaTypes, acceptLangs, acceptEncs);
    List<Object> varyValues = new LinkedList<>();
    for (Variant requestVar : requestVariants) {
        for (Variant var : vars) {
            MediaType mt = var.getMediaType();
            Locale lang = var.getLanguage();
            String enc = var.getEncoding();

            boolean mtMatched = mt == null || requestVar.getMediaType().isCompatible(mt);
            if (mtMatched) {
                handleVaryValues(varyValues, HttpHeaders.ACCEPT);
            }

            boolean langMatched = lang == null || isLanguageMatched(requestVar.getLanguage(), lang);
            if (langMatched) {
                handleVaryValues(varyValues, HttpHeaders.ACCEPT_LANGUAGE);
            }

            boolean encMatched = acceptEncs.isEmpty() || enc == null 
                || isEncMatached(requestVar.getEncoding(), enc);
            if (encMatched) {
                handleVaryValues(varyValues, HttpHeaders.ACCEPT_ENCODING);
            }

            if (mtMatched && encMatched && langMatched) {
                addVaryHeader(varyValues);
                return var;
            }
        }
    }
    return null;
}
 

private static String getTemplate(Variant v) {
	return
		v.getEncoding()!=null?
			TEMPLATES[0]:
			TEMPLATES[1];
}