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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// A simple class to represent a database. Uses XMLHttpRequest to interface with
// the CouchDB server.
function CouchDB(name) {
this.name = name
this.uri = "/" + encodeURIComponent(name) + "/";
request = CouchDB.request;
// Creates the database on the server
this.createDb = function() {
var req = request("PUT", this.uri);
var result = JSON.parse(req.responseText);
if (req.status != 201)
throw result;
return result;
}
// Deletes the database on the server
this.deleteDb = function() {
var req = request("DELETE", this.uri);
if (req.status == 404)
return false;
var result = JSON.parse(req.responseText);
if (req.status != 202)
throw result;
return result;
}
// Save a document to the database
this.save = function(doc, options) {
var req;
if (doc._id == undefined)
req = request("POST", this.uri + encodeOptions(options), {
body: JSON.stringify(doc)
});
else
req = request("PUT", this.uri + encodeURIComponent(doc._id) + encodeOptions(options), {
body: JSON.stringify(doc)
});
var result = JSON.parse(req.responseText);
if (req.status != 201)
throw result;
// set the _id and _rev members on the input object, for caller convenience.
doc._id = result.id;
doc._rev = result.rev;
return result;
}
// Open a document from the database
this.open = function(docId, options) {
var req = request("GET", this.uri + encodeURIComponent(docId) + encodeOptions(options));
if (req.status == 404)
return null;
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
// Deletes a document from the database
this.deleteDoc = function(doc) {
var req = request("DELETE", this.uri + encodeURIComponent(doc._id) + "?rev=" + doc._rev);
var result = JSON.parse(req.responseText);
if (req.status != 202)
throw result;
doc._rev = result.rev; //record rev in input document
doc._deleted = true;
return result;
}
this.bulkSave = function(docs, options) {
var req = request("POST", this.uri + "_bulk_docs" + encodeOptions(options), {
body: JSON.stringify({"docs": docs})
});
var result = JSON.parse(req.responseText);
if (req.status != 201)
throw result;
for(var i in docs) {
docs[i]._rev = result.new_revs[i].rev;
}
return result;
}
// Applies the map function to the contents of database and returns the results.
this.query = function(mapFun, reduceFun, options) {
var body = {language: "javascript"};
if (typeof(mapFun) != "string")
mapFun = mapFun.toSource ? mapFun.toSource() : "(" + mapFun.toString() + ")";
body.map = mapFun;
if (reduceFun != null) {
if (typeof(reduceFun) != "string")
reduceFun = reduceFun.toSource ? reduceFun.toSource() : "(" + reduceFun.toString() + ")";
body.reduce = reduceFun;
}
var req = request("POST", this.uri + "_temp_view" + encodeOptions(options), {
headers: {"Content-Type": "application/json"},
body: JSON.stringify(body)
});
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
this.view = function(viewname, options) {
var req = request("GET", this.uri + "_view/" + viewname + encodeOptions(options));
if (req.status == 404)
return null;
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
// gets information about the database
this.info = function() {
var req = request("GET", this.uri);
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
this.allDocs = function(options) {
var req = request("GET", this.uri + "_all_docs" + encodeOptions(options));
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
this.compact = function() {
var req = request("POST", this.uri + "_compact");
var result = JSON.parse(req.responseText);
if (req.status != 202)
throw result;
return result;
}
// Convert a options object to an url query string.
// ex: {key:'value',key2:'value2'} becomes '?key="value"&key2="value2"'
function encodeOptions(options) {
var buf = []
if (typeof(options) == "object" && options !== null) {
for (var name in options) {
if (!options.hasOwnProperty(name)) continue;
var value = options[name];
if (name == "key" || name == "startkey" || name == "endkey") {
value = toJSON(value);
}
buf.push(encodeURIComponent(name) + "=" + encodeURIComponent(value));
}
}
if (!buf.length) {
return "";
}
return "?" + buf.join("&");
}
function toJSON(obj) {
return obj !== null ? JSON.stringify(obj) : null;
}
}
CouchDB.allDbs = function() {
var req = CouchDB.request("GET", "/_all_dbs");
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
CouchDB.getVersion = function() {
var req = CouchDB.request("GET", "/");
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result.version;
}
CouchDB.replicate = function(source, target) {
var req = CouchDB.request("POST", "/_replicate", {
body: JSON.stringify({source: source, target: target})
});
var result = JSON.parse(req.responseText);
if (req.status != 200)
throw result;
return result;
}
CouchDB.request = function(method, uri, options) {
options = options || {};
var req = null;
if (typeof(XMLHttpRequest) != "undefined") {
req = new XMLHttpRequest();
} else if (typeof(ActiveXObject) != "undefined") {
req = new ActiveXObject("Microsoft.XMLHTTP");
} else {
throw new Error("No XMLHTTPRequest support detected");
}
req.open(method, uri, false);
if (options.headers) {
var headers = options.headers;
for (var headerName in headers) {
if (!headers.hasOwnProperty(headerName)) continue;
req.setRequestHeader(headerName, headers[headerName]);
}
}
req.send(options.body || null);
return req;
}
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