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using System;
using System.Collections;
namespace SemWeb {
internal class NS {
public const string RDF = "http://www.w3.org/1999/02/22-rdf-syntax-ns#";
public const string RDFS = "http://www.w3.org/2000/01/rdf-schema#";
/*Entity entRDFTYPE = "http://www.w3.org/1999/02/22-rdf-syntax-ns#type";
Entity entRDFFIRST = "http://www.w3.org/1999/02/22-rdf-syntax-ns#first";
Entity entRDFREST = "http://www.w3.org/1999/02/22-rdf-syntax-ns#rest";
Entity entRDFNIL = "http://www.w3.org/1999/02/22-rdf-syntax-ns#nil";
Entity entOWLSAMEAS = "http://www.w3.org/2002/07/owl#sameAs";
Entity entLOGIMPLIES = "http://www.w3.org/2000/10/swap/log#implies";*/
}
public class NamespaceManager {
NamespaceManager parent;
Hashtable atob = new Hashtable();
Hashtable btoa = new Hashtable();
public NamespaceManager() : this (null) {
}
public NamespaceManager(NamespaceManager parent) {
this.parent = parent;
}
public void AddNamespace(string uri, string prefix) {
atob[uri] = prefix;
btoa[prefix] = uri;
}
public virtual string GetNamespace(string prefix) {
string ret = (string)btoa[prefix];
if (ret != null) return ret;
if (parent != null) return parent.GetNamespace(prefix);
return null;
}
public virtual string GetPrefix(string uri) {
string ret = (string)atob[uri];
if (ret != null) return ret;
if (parent != null) return parent.GetPrefix(uri);
return null;
}
public bool Normalize(string uri, out string prefix, out string localname) {
int hash = uri.LastIndexOf('#');
if (hash > 0) {
prefix = GetPrefix(uri.Substring(0, hash+1));
if (prefix != null) {
localname = uri.Substring(hash+1);
return true;
}
}
hash = uri.LastIndexOf('/');
if (hash > 0) {
prefix = GetPrefix(uri.Substring(0, hash+1));
if (prefix != null) {
localname = uri.Substring(hash+1);
return true;
}
}
prefix = null;
localname = null;
return false;
}
public string Normalize(string uri) {
string prefix, localname;
if (Normalize(uri, out prefix, out localname)) {
bool ok = true;
if (localname.Length == 0) ok = false;
else if (!char.IsLetter(localname[0])) ok = false;
foreach (char c in localname)
if (!char.IsLetterOrDigit(c) && c != '-' && c != '_')
ok = false;
if (ok)
return prefix + ":" + localname;
}
return "<" + uri + ">";
}
public string Resolve(string qname) {
int colon = qname.IndexOf(':');
if (colon == -1) throw new ArgumentException("Invalid qualified name.");
string prefix = qname.Substring(0, colon);
string ns = GetNamespace(prefix);
if (ns == null) throw new ArgumentException("The prefix " + prefix + " is not declared.");
return ns + qname.Substring(colon+1);
}
public ICollection GetNamespaces() {
if (parent == null) return atob.Keys;
ArrayList items = new ArrayList(atob.Keys);
foreach (string ns in parent.GetNamespaces())
if (!items.Contains(ns))
items.Add(ns);
return items;
}
public ICollection GetPrefixes() {
if (parent == null) return atob.Values;
ArrayList items = new ArrayList(atob.Values);
foreach (string ns in parent.GetPrefixes())
if (!items.Contains(ns))
items.Add(ns);
return items;
}
}
}
namespace SemWeb.IO {
using SemWeb;
internal class AutoPrefixNamespaceManager : NamespaceManager {
int counter = 0;
public AutoPrefixNamespaceManager() : this (null) {
}
public AutoPrefixNamespaceManager(NamespaceManager parent) : base(parent) {
}
public override string GetPrefix(string uri) {
string ret = base.GetPrefix(uri);
if (ret != null) return ret;
if (uri == "http://www.w3.org/1999/02/22-rdf-syntax-ns#" && GetNamespace("rdf") == null)
ret = "rdf";
else if (uri == "http://www.w3.org/2000/01/rdf-schema#" && GetNamespace("rdfs") == null)
ret = "rdfs";
else if (uri == "http://www.w3.org/2002/07/owl#" && GetNamespace("owl") == null)
ret = "owl";
else if (uri == "http://purl.org/dc/elements/1.1/" && GetNamespace("dc") == null)
ret = "dc";
else if (uri == "http://xmlns.com/foaf/0.1/" && GetNamespace("foaf") == null)
ret = "foaf";
else
ret = "autons" + (counter++);
AddNamespace(uri, ret);
return ret;
}
}
}
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