private Resource resolveInternal()

in src/main/java/org/apache/sling/resourceresolver/impl/ResourceResolverImpl.java [334:476]
95 lines of code
20 McCabe index (conditional complexity)

    private Resource resolveInternal(final RequestInfo request, String absPath) {
        // make sure abspath is not null and is absolute
        if (absPath == null) {
            absPath = "/";
        } else if (!absPath.startsWith("/")) {
            absPath = "/" + absPath;
        }

        // check for special namespace prefix treatment
        absPath = unmangleNamespaces(absPath);

        // Assume http://localhost:80 if request is null
        String[] realPathList = {absPath};
        String requestPath;
        if (request != null) {
            requestPath = getMapPath(request.scheme, request.serverName, request.serverPort, absPath);
        } else {
            requestPath = getMapPath("http", "localhost", 80, absPath);
        }

        logger.debug("resolve: Resolving request path {}", requestPath);

        // loop while finding internal or external redirect into the
        // content out of the virtual host mapping tree
        // the counter is to ensure we are not caught in an endless loop here
        // TODO: might do better to be able to log the loop and help the user
        for (int i = 0; i < 100; i++) {

            String[] mappedPath = null;

            final Iterator<MapEntry> mapEntriesIterator =
                    this.factory.getMapEntries().getResolveMapsIterator(requestPath);
            while (mapEntriesIterator.hasNext()) {
                final MapEntry mapEntry = mapEntriesIterator.next();
                mappedPath = mapEntry.replace(requestPath);
                if (mappedPath != null) {
                    if (logger.isDebugEnabled()) {
                        logger.debug(
                                "resolve: MapEntry {} matches, mapped path is {}",
                                mapEntry,
                                Arrays.toString(mappedPath));
                    }
                    if (mapEntry.isInternal()) {
                        // internal redirect
                        logger.debug("resolve: Redirecting internally");
                        break;
                    }

                    // external redirect
                    logger.debug("resolve: Returning external redirect");
                    return this.factory
                            .getResourceDecoratorTracker()
                            .decorate(new RedirectResource(this, absPath, mappedPath[0], mapEntry.getStatus()));
                }
            }

            // if there is no virtual host based path mapping, abort
            // and use the original realPath
            if (mappedPath == null) {
                logger.debug("resolve: Request path {} does not match any MapEntry", requestPath);
                break;
            }

            // if the mapped path is not an URL, use this path to continue
            if (!mappedPath[0].contains("://")) {
                logger.debug("resolve: Mapped path is for resource tree");
                realPathList = mappedPath;
                break;
            }

            // otherwise the mapped path is an URI and we have to try to
            // resolve that URI now, using the URI's path as the real path
            try {
                final URI uri = new URI(mappedPath[0], false);
                requestPath = getMapPath(uri.getScheme(), uri.getHost(), uri.getPort(), uri.getPath());
                realPathList = new String[] {uri.getPath()};

                logger.debug("resolve: Mapped path is an URL, using new request path {}", requestPath);
            } catch (final URIException use) {
                // TODO: log and fail
                throw new ResourceNotFoundException(absPath);
            }
        }

        // now we have the real path resolved from virtual host mapping
        // this path may be absolute or relative, in which case we try
        // to resolve it against the search path

        Resource res = null;
        for (int i = 0; res == null && i < realPathList.length; i++) {
            final ParsedParameters parsedPath = new ParsedParameters(realPathList[i]);
            final String realPath = parsedPath.getRawPath();

            // first check whether the requested resource is a StarResource
            if (StarResource.appliesTo(realPath)) {
                logger.debug("resolve: Mapped path {} is a Star Resource", realPath);
                res = new StarResource(this, ensureAbsPath(realPath));

            } else {

                if (realPath.startsWith("/")) {

                    // let's check it with a direct access first
                    logger.debug("resolve: Try absolute mapped path {}", realPath);
                    res = resolveInternal(realPath, parsedPath.getParameters());

                } else {

                    for (final String path : factory.getSearchPath()) {
                        logger.debug("resolve: Try relative mapped path with search path entry {}", path);
                        res = resolveInternal(path + realPath, parsedPath.getParameters());
                        if (res != null) {
                            break;
                        }
                    }
                }
            }
        }

        // if no resource has been found, use a NonExistingResource
        if (res == null) {
            final ParsedParameters parsedPath = new ParsedParameters(realPathList[0]);
            final String resourcePath = ensureAbsPath(parsedPath.getRawPath());
            logger.debug(
                    "resolve: Path {} does not resolve, returning NonExistingResource at {}", absPath, resourcePath);

            res = new NonExistingResource(this, resourcePath);
            // SLING-864: if the path contains a dot we assume this to be
            // the start for any selectors, extension, suffix, which may be
            // used for further request processing.
            // the resolution path must be the full path and is already set within
            // the non existing resource
            final int index = resourcePath.indexOf('.');
            if (index != -1) {
                res.getResourceMetadata().setResolutionPathInfo(resourcePath.substring(index));
            }
            res.getResourceMetadata().setParameterMap(parsedPath.getParameters());
        } else {
            logger.debug("resolve: Path {} resolves to Resource {}", absPath, res);
        }

        return this.factory.getResourceDecoratorTracker().decorate(res);
    }