uri.java

来自「开源的axis2框架的源码。用于开发WEBSERVER」· Java 代码 · 共 1,619 行 · 第 1/5 页

     * @param p_scheme      the URI scheme (cannot be null or empty)
     * @param p_userinfo    the URI userinfo (cannot be specified if host is null)
     * @param p_host        the hostname, IPv4 address or IPv6 reference for the URI
     * @param p_port        the URI port (may be -1 for "unspecified"; cannot be specified if host is
     *                      null)
     * @param p_path        the URI path - if the path contains '?' or '#', then the query string
     *                      and/or fragment will be set from the path; however, if the query and
     *                      fragment are specified both in the path and as separate parameters, an
     *                      exception is thrown
     * @param p_queryString the URI query string (cannot be specified if path is null)
     * @param p_fragment    the URI fragment (cannot be specified if path is null)
     * @throws MalformedURIException if any of the parameters violates syntax rules or semantic rules
     */
    public URI(String p_scheme, String p_userinfo,
               String p_host, int p_port, String p_path,
               String p_queryString, String p_fragment)
            throws MalformedURIException {
        if (p_scheme == null || p_scheme.trim().length() == 0) {
            throw new MalformedURIException("Scheme is required!");
        }

        if (p_host == null) {
            if (p_userinfo != null) {
                throw new MalformedURIException(
                        "Userinfo may not be specified if host is not specified!");
            }
            if (p_port != -1) {
                throw new MalformedURIException(
                        "Port may not be specified if host is not specified!");
            }
        }

        if (p_path != null) {
            if (p_path.indexOf('?') != -1 && p_queryString != null) {
                throw new MalformedURIException(
                        "Query string cannot be specified in path and query string!");
            }

            if (p_path.indexOf('#') != -1 && p_fragment != null) {
                throw new MalformedURIException(
                        "Fragment cannot be specified in both the path and fragment!");
            }
        }

        setScheme(p_scheme);
        setHost(p_host);
        setPort(p_port);
        setUserinfo(p_userinfo);
        setPath(p_path);
        setQueryString(p_queryString);
        setFragment(p_fragment);
    }

    /**
     * Initialize all fields of this URI from another URI.
     *
     * @param p_other the URI to copy (cannot be null)
     */
    private void initialize(URI p_other) {
        m_scheme = p_other.getScheme();
        m_userinfo = p_other.getUserinfo();
        m_host = p_other.getHost();
        m_port = p_other.getPort();
        m_regAuthority = p_other.getRegBasedAuthority();
        m_path = p_other.getPath();
        m_queryString = p_other.getQueryString();
        m_fragment = p_other.getFragment();
    }

    /**
     * Initializes this URI from a base URI and a URI specification string. See RFC 2396 Section 4 and
     * Appendix B for specifications on parsing the URI and Section 5 for specifications on resolving
     * relative URIs and relative paths.
     *
     * @param p_base    the base URI (may be null if p_uriSpec is an absolute URI)
     * @param p_uriSpec the URI spec string which may be an absolute or relative URI (can only be
     *                  null/empty if p_base is not null)
     * @throws MalformedURIException if p_base is null and p_uriSpec is not an absolute URI or if
     *                               p_uriSpec violates syntax rules
     */
    private void initialize(URI p_base, String p_uriSpec)
            throws MalformedURIException {

        String uriSpec = p_uriSpec;
        int uriSpecLen = (uriSpec != null) ? uriSpec.length() : 0;

        if (p_base == null && uriSpecLen == 0) {
            throw new MalformedURIException(
                    "Cannot initialize URI with empty parameters.");
        }

        // just make a copy of the base if spec is empty
        if (uriSpecLen == 0) {
            initialize(p_base);
            return;
        }

        int index = 0;

        // Check for scheme, which must be before '/', '?' or '#'. Also handle
        // names with DOS drive letters ('D:'), so 1-character schemes are not
        // allowed.
        int colonIdx = uriSpec.indexOf(':');
        if (colonIdx != -1) {
            final int searchFrom = colonIdx - 1;
            // search backwards starting from character before ':'.
            int slashIdx = uriSpec.lastIndexOf('/', searchFrom);
            int queryIdx = uriSpec.lastIndexOf('?', searchFrom);
            int fragmentIdx = uriSpec.lastIndexOf('#', searchFrom);

            if (colonIdx < 2 || slashIdx != -1 ||
                    queryIdx != -1 || fragmentIdx != -1) {
                // A standalone base is a valid URI according to spec
                if (colonIdx == 0 || (p_base == null && fragmentIdx != 0)) {
                    throw new MalformedURIException("No scheme found in URI.");
                }
            } else {
                initializeScheme(uriSpec);
                index = m_scheme.length() + 1;

                // Neither 'scheme:' or 'scheme:#fragment' are valid URIs.
                if (colonIdx == uriSpecLen - 1 || uriSpec.charAt(colonIdx + 1) == '#') {
                    throw new MalformedURIException("Scheme specific part cannot be empty.");
                }
            }
        }
        // Two slashes means we may have authority, but definitely means we're either
        // matching net_path or abs_path. These two productions are ambiguous in that
        // every net_path (except those containing an IPv6Reference) is an abs_path.
        // RFC 2396 resolves this ambiguity by applying a greedy left most matching rule.
        // Try matching net_path first, and if that fails we don't have authority so
        // then attempt to match abs_path.
        //
        // net_path = "//" authority [ abs_path ]
        // abs_path = "/"  path_segments
        if (((index + 1) < uriSpecLen) &&
                (uriSpec.charAt(index) == '/' && uriSpec.charAt(index + 1) == '/')) {
            index += 2;
            int startPos = index;

            // Authority will be everything up to path, query or fragment
            char testChar = '\0';
            while (index < uriSpecLen) {
                testChar = uriSpec.charAt(index);
                if (testChar == '/' || testChar == '?' || testChar == '#') {
                    break;
                }
                index++;
            }

            // Attempt to parse authority. If the section is an empty string
            // this is a valid server based authority, so set the host to this
            // value.
            if (index > startPos) {
                // If we didn't find authority we need to back up. Attempt to
                // match against abs_path next.
                if (!initializeAuthority(uriSpec.substring(startPos, index))) {
                    index = startPos - 2;
                }
            } else {
                m_host = "";
            }
        }

        initializePath(uriSpec, index);

        // Resolve relative URI to base URI - see RFC 2396 Section 5.2
        // In some cases, it might make more sense to throw an exception
        // (when scheme is specified is the string spec and the base URI
        // is also specified, for example), but we're just following the
        // RFC specifications
        if (p_base != null) {

            // check to see if this is the current doc - RFC 2396 5.2 #2
            // note that this is slightly different from the RFC spec in that
            // we don't include the check for query string being null
            // - this handles cases where the urispec is just a query
            // string or a fragment (e.g. "?y" or "#s") -
            // see <http://www.ics.uci.edu/~fielding/url/test1.html> which
            // identified this as a bug in the RFC
            if (m_path.length() == 0 && m_scheme == null &&
                    m_host == null && m_regAuthority == null) {
                m_scheme = p_base.getScheme();
                m_userinfo = p_base.getUserinfo();
                m_host = p_base.getHost();
                m_port = p_base.getPort();
                m_regAuthority = p_base.getRegBasedAuthority();
                m_path = p_base.getPath();

                if (m_queryString == null) {
                    m_queryString = p_base.getQueryString();
                }
                return;
            }

            // check for scheme - RFC 2396 5.2 #3
            // if we found a scheme, it means absolute URI, so we're done
            if (m_scheme == null) {
                m_scheme = p_base.getScheme();
            } else {
                return;
            }

            // check for authority - RFC 2396 5.2 #4
            // if we found a host, then we've got a network path, so we're done
            if (m_host == null && m_regAuthority == null) {
                m_userinfo = p_base.getUserinfo();
                m_host = p_base.getHost();
                m_port = p_base.getPort();
                m_regAuthority = p_base.getRegBasedAuthority();
            } else {
                return;
            }

            // check for absolute path - RFC 2396 5.2 #5
            if (m_path.length() > 0 &&
                    m_path.startsWith("/")) {
                return;
            }

            // if we get to this point, we need to resolve relative path
            // RFC 2396 5.2 #6
            String path = "";
            String basePath = p_base.getPath();

            // 6a - get all but the last segment of the base URI path
            if (basePath != null && basePath.length() > 0) {
                int lastSlash = basePath.lastIndexOf('/');
                if (lastSlash != -1) {
                    path = basePath.substring(0, lastSlash + 1);
                }
            } else if (m_path.length() > 0) {
                path = "/";
            }

            // 6b - append the relative URI path
            path = path.concat(m_path);

            // 6c - remove all "./" where "." is a complete path segment
            index = -1;
            while ((index = path.indexOf("/./")) != -1) {
                path = path.substring(0, index + 1).concat(path.substring(index + 3));
            }

            // 6d - remove "." if path ends with "." as a complete path segment
            if (path.endsWith("/.")) {
                path = path.substring(0, path.length() - 1);
            }

            // 6e - remove all "<segment>/../" where "<segment>" is a complete
            // path segment not equal to ".."
            index = 1;
            int segIndex = -1;
            String tempString = null;

            while ((index = path.indexOf("/../", index)) > 0) {
                tempString = path.substring(0, path.indexOf("/../"));
                segIndex = tempString.lastIndexOf('/');
                if (segIndex != -1) {
                    if (!tempString.substring(segIndex).equals("..")) {
                        path = path.substring(0, segIndex + 1).concat(path.substring(index + 4));
                        index = segIndex;
                    } else
                        index += 4;
                } else
                    index += 4;
            }

            // 6f - remove ending "<segment>/.." where "<segment>" is a
            // complete path segment
            if (path.endsWith("/..")) {
                tempString = path.substring(0, path.length() - 3);
                segIndex = tempString.lastIndexOf('/');
                if (segIndex != -1) {
                    path = path.substring(0, segIndex + 1);
                }
            }
            m_path = path;
        }
    }

    /**
     * Initialize the scheme for this URI from a URI string spec.
     *
     * @param p_uriSpec the URI specification (cannot be null)
     * @throws MalformedURIException if URI does not have a conformant scheme
     */
    private void initializeScheme(String p_uriSpec)
            throws MalformedURIException {
        int uriSpecLen = p_uriSpec.length();
        int index = 0;
        String scheme = null;
        char testChar = '\0';

        while (index < uriSpecLen) {
            testChar = p_uriSpec.charAt(index);
            if (testChar == ':' || testChar == '/' ||
                    testChar == '?' || testChar == '#') {
                break;
            }
            index++;
        }
        scheme = p_uriSpec.substring(0, index);

        if (scheme.length() == 0) {
            throw new MalformedURIException("No scheme found in URI.");
        } else {
            setScheme(scheme);
        }
    }

    /**
     * Initialize the authority (either server or registry based) for this URI from a URI string
     * spec.
     *
     * @param p_uriSpec the URI specification (cannot be null)
     * @return true if the given string matched server or registry based authority
     */
    private boolean initializeAuthority(String p_uriSpec) {

        int index = 0;
        int start = 0;
        int end = p_uriSpec.length();