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sparql.js
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sparql.js
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// Simple SPARQL lib
var sparqlConnection = function (endpoint) {
var ep = endpoint;
function newPromise() {
var _value;
var _status;
var _changed;
return {
getStatus: function() { return _status },
getValue: function() { return _value },
setValue: function(v) {
_value = v;
_status = true;
if (_changed) _changed(_value);
},
setChangedFn: function(f) { _changed = f },
// a different view, this one read only, and can register a callback
getReadOnly: function() {
return {
getStatus: function() { return _status },
getValue: function() { return _value },
setChangedFn: function(f) { _changed = f }
};
}
};
};
function ajaxRequest () {
var activexmodes=["Msxml2.XMLHTTP", "Microsoft.XMLHTTP"]; //activeX versions to check for in IE
if (window.ActiveXObject) { //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)
for (var i = 0; i < activexmodes.length; i++) {
try {
return new ActiveXObject(activexmodes[i]);
} catch(e) { /* suppress error */ }
}
} else if (window.XMLHttpRequest) // if Mozilla, Safari etc
return new XMLHttpRequest();
else
return false;
};
function sparqlXMLtoJSON(xml) {
var b = xml.getElementsByTagName("boolean");
if (b.length !== 0) return {
head: { },
"boolean" : b[0].firstChild.nodeValue === "true"
};
function readHead() {
var v;
var vars = [];
var variables = xml.getElementsByTagName("head")[0].getElementsByTagName("variable");
for (v = 0; v < variables.length; v++) vars.push(variables[v].getAttribute("name"));
return { vars: vars };
};
function readResults() {
function literalValue(l, lang, dt) {
var lit = { value: l };
if (dt) {
lit.type = "typed-literal";
lit.datatype = dt;
} else {
lit.type = "literal";
if (lang) lit["xml:lang"] = lang;
}
return lit;
};
function valueOf(bind) {
var bnode, iri, literal;
bnode = bind.getElementsByTagName("bnode");
if (bnode.length !== 0) {
return { type: "bnode", value: bnode[0].firstChild.nodeValue };
}
iri = bind.getElementsByTagName("uri");
if (iri.length !== 0) {
return { type: "uri", value: iri[0].firstChild.nodeValue };
}
literal = bind.getElementsByTagName("literal");
if (literal.length !== 0) {
var lang = literal[0].getAttributeNS("xml", "lang");
var dt = literal[0].getAttribute("datatype");
var value = literal[0].firstChild ? literal[0].firstChild.nodeValue : "";
return literalValue(value, lang, dt);
}
return { type: "unknown" };
};
function readBinding(result) {
var b;
var jbinding = {};
var binding = result.getElementsByTagName("binding");
for (b = 0; b < binding.length; b++) {
jbinding[binding[b].getAttribute("name")] = valueOf(binding[b]);
}
return jbinding;
};
var r;
var bindings = [];
var resultsNodes = xml.getElementsByTagName("results");
var results = resultsNodes[0].getElementsByTagName("result");
for (r = 0; r < results.length; r++) bindings.push(readBinding(results[r]));
return {
bindings: bindings
};
};
return {
head: readHead(),
results: readResults()
};
};
// end of sparqlXMLtoJSON
function graphDesc(g) {
var desc;
if (!g || g === "<default>" || g == "default") {
desc = "DEFAULT";
} else {
desc = "GRAPH <" + g + ">";
}
return desc;
};
return {
query: function (text, success, graphs, namedgraphs, errfn, complete) {
// start query
var url;
var request = ajaxRequest();
if (!success) {
alert("No operation defined to execute at the end of query:\n" + text);
success = function(){};
}
if (!complete) complete = function() {};
// request.overrideMimeType('application/json');
// register callback
if (!errfn) errfn = function(){};
request.onreadystatechange = function() {
if (request.readyState == 4) {
if (request.status == 200) {
success(request.responseXML);
} else if (request.status >= 400) {
errfn(request.responseText);
}
complete();
}
};
if (!graphs) graphs = [];
if (!namedgraphs) namedgraphs = [];
url = ep + "?query=" + encodeURIComponent(text);
for (g in graphs) url += "&default-graph-uri=" + encodeURIComponent(g);
for (g in namedgraphs) url += "&default-named-graph-uri=" + encodeURIComponent(g);
request.open("GET", url);
request.send();
},
action: function (text, complete, errfn) {
// start query
var request = ajaxRequest();
request.overrideMimeType('application/json');
// register callback
if (!errfn) errfn = function(){};
if (!complete) complete = function(){};
request.onreadystatechange = function() {
if (request.readyState == 4) {
if (request.status == 200) {
complete(request.responseXML);
} else if (request.status >= 400) {
errfn(request.responseText);
}
}
}
request.open("POST", ep);
request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
params = "update=" + encodeURIComponent(text);
request.send(params);
},
queryJSON: function(text, success, graphs, namedgraphs, errfn, complete) {
this.query(text, function(xml){ success(sparqlXMLtoJSON(xml)) }, graphs, namedgraphs, errfn, complete);
},
getGraphs: function (notifier, errfn) {
var result = newPromise();
if (notifier) result.setChangedFn(notifier);
if (!errfn) errfn = function(){};
this.query("SELECT DISTINCT ?g {GRAPH ?g {?s ?p ?o}}", function(ans){
var graphs = new Array();
var results = ans.getElementsByTagName("results");
var resultElts = results[0].getElementsByTagName("result");
var bindingElts, uri;
var r, b;
for (r = 0; r < resultElts.length; r++) {
bindingElts = resultElts[r].getElementsByTagName("binding");
for (b = 0; b < bindingElts.length; b++) {
uri = bindingElts[b].getElementsByTagName("uri");
if (uri.length > 0) graphs.push(uri[0].firstChild.nodeValue);
}
}
result.setValue(graphs);
}, null, null, errfn);
return result.getReadOnly();
},
isGraph: function (name, notifier) {
var result = newPromise();
if (notifier) result.setChangedFn(notifier);
this.query("ASK {GRAPH <" + name + "> {?s ?p ?o}}", function(ans){
var bool = ans.getElementsByTagName("boolean");
var data = false;
if (bool.length > 0) {
data = bool[0].firstChild.nodeValue === "true";
}
result.setValue(data);
});
return result.getReadOnly();
},
removeGraph: function(graph, complete, errf) {
var cmd;
if (!graph) {
cmd = "DROP DEFAULT";
} else {
cmd = "DROP GRAPH <" + graph + ">";
}
this.action(cmd, complete, errf);
},
addGraph: function(graph, complete, errf) {
this.action("CREATE GRAPH <" + graph + ">", complete, errf);
},
moveGraph: function(src, dest, complete, errf) {
var srcGraph = graphDesc(src);
var destGraph = graphDesc(dest);
this.action("MOVE " + srcGraph + " TO " + destGraph, complete, errf);
},
copyGraph: function(src, dest, complete, errf) {
var srcGraph = graphDesc(src);
var destGraph = graphDesc(dest);
this.action("COPY " + srcGraph + " TO " + destGraph, complete, errf);
}
};
};