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Copy pathSDD.Source.json_node.js
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137 lines (114 loc) · 3.37 KB
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var extend = require("node.extend"),
Source = require("./SDD.Source"),
Table = require("./SDD.Table"),
Utils = require("./Utils"),
fs = require("fs"),
Promise = require("./Promise");
var readFileP = Promise.promisify(fs.readFile);
var P = exports.P = Utils.create(Source.P); // public methods, inherit from base Source class
exports.D = extend(true, {}, Source.D, {
// default object properties
cfg: {},
jsonfiles: {}
});
exports.Create = function(config) {
var obj = Utils.create(P);
extend(true, obj, exports.D);
obj.Config(config);
return obj;
};
P.Config = function(config) {
extend(this.cfg, config);
};
function MetainfDone(data, status, jqxhr, ctx) {
var tbl,
newt,
i;
if (!data) return Promise.reject(new Error("invalid data object"));
if (!data.hasOwnProperty("formatID") || data.formatID != "1") return Promise.reject(new Error("unknown data format"));
if (!data.hasOwnProperty("schema") || !data.hasOwnProperty("version")) return Promise.reject(new Error("data has no version information"));
if (!data.hasOwnProperty("tables") || !data.hasOwnProperty("tables")) return Promise.reject(new Error("data has no table information"));
this.version = data.version;
this.schema = data.schema;
if (data.hasOwnProperty("verdesc")) this.verdesc = data.verdesc;
// reset stuff
this.tables = {};
this.jsonfiles = {};
for (tbl in data.tables) {
if (!data.tables.hasOwnProperty(tbl)) continue;
// create a new table from our metadata
newt = Table.Create(tbl, this, data.tables[tbl]);
this.tables[newt.name] = newt;
// collect a list of json sources
for (i = 0; i < newt.segments.length; i++) {
if (this.jsonfiles.hasOwnProperty(newt.segments[i].tag)) continue;
this.jsonfiles[newt.segments[i].tag] = {
loaded: false,
p: null
};
}
}
return Promise.resolve({
context: ctx,
source: this
});
}
P.LoadMeta = function(ctx) {
var self = this;
if (!this.cfg.hasOwnProperty("path") || typeof this.cfg.path != "string") {
return Promise.reject(new Error("path is required"));
}
return readFileP(this.cfg.path + "/metainf.json", "utf8").then(function(contents) {
var data;
try {
data = JSON.parse(contents);
} catch (err) {
return Promise.reject(err);
}
return MetainfDone.apply(self, [data, null, null, ctx]);
}).caught(function(err) {
return Promise.reject(err);
});
};
function LoadFileDone(res, rej, ctx, jsf, data) {
if (!data || !data.hasOwnProperty("tables")) {
return rej(new Error("invalid data object"));
} else if (!data.hasOwnProperty("formatID") || data.formatID != "1") {
return rej(new Error("unknown data format"));
} else {
this.jsonfiles[jsf].loaded = true;
this.jsonfiles[jsf].data = data;
return res({
context: ctx,
tag: jsf,
data: data
});
}
}
P.LoadTag = function(jsf, ctx) {
var self = this;
if (this.jsonfiles[jsf].loaded) {
return Promise.resolve({
tag: jsf,
data: this.jsonfiles[jsf].data
});
} else if (this.jsonfiles[jsf].p !== null) {
return this.jsonfiles[jsf].p;
} else {
this.jsonfiles[jsf].p = new Promise(function(res, rej) {
fs.readFile(self.cfg.path + "/" + jsf + ".json", "utf8", function(err, contents) {
var data;
if (err) {
return rej(err);
}
try {
data = JSON.parse(contents);
} catch (err) {
return rej(err);
}
LoadFileDone.apply(self, [res, rej, ctx, jsf, data]);
});
});
return this.jsonfiles[jsf].p;
}
};