From d59a4921188753dbe4c0161081755a28112c3ef6 Mon Sep 17 00:00:00 2001
From: Nathan Gass
Date: Thu, 22 Mar 2012 18:18:42 +0000
Subject: Branch itools/devel-utf8 created

---
 devel-utf8/itjs/loader.js | 141 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 devel-utf8/itjs/loader.js

(limited to 'devel-utf8/itjs/loader.js')

diff --git a/devel-utf8/itjs/loader.js b/devel-utf8/itjs/loader.js
new file mode 100644
index 0000000..9fdb9a8
--- /dev/null
+++ b/devel-utf8/itjs/loader.js
@@ -0,0 +1,141 @@
+/**
+ * Create loader to request data from server
+ * Uses it_http class for communication
+ *
+ * @param handler Object providing clear()/render() function when data arrives
+ */
+function it_loader(handler)
+{
+	/* Clear cache etc. if completely new data */
+	this.http = null;
+	this.handler = handler;
+	this.callback = { object:this, method:'dataReady', errorhandler:'onerror' };
+	this.clear();
+}
+
+/* Methods */
+it_loader.prototype =
+{
+
+/* Clear cache and initialize handler */
+clear: function()
+{
+	/* Clear cache etc. if completely new data */
+	this.entry = new Array();
+	this.start = this.end = 0;
+	this.attr = { num: 0, loadtime: 0 };
+
+	if (this.handler.clear)
+		this.handler.clear();
+},
+
+load: function(baseurl, pos, num, query_volatile, retry)
+{
+	/* Convert to int */
+	pos -= 0;
+	num -= 0;
+
+	if (isNaN(retry))
+		retry = 0;
+
+	if (baseurl != this.baseurl)
+	{
+		this.clear();
+		this.baseurl = baseurl;
+		this.start = this.end = pos;
+	}
+
+	this.pos = pos;
+	this.num = num;
+	this.query_volatile = query_volatile;
+
+	this.stop();
+
+	while ((num > 0) && (typeof this.entry[pos] != "undefined"))
+	{
+		pos++;
+		num--;
+	}
+
+	if (this.attr.eof)
+		num = Math.min(num, this.end - pos);
+
+	if (num > 0)
+	{
+		this.retry = retry;
+		this.http = it_http.get_instance();
+		this.http.get(baseurl + (baseurl.match(/\?/) ? "&" : "?") + "pos=" + pos + "&num=" + num + (retry ? "&retry=" + retry : "") + (query_volatile ? query_volatile : ""), this.callback);
+	}
+	else
+		this.handler.render(this);
+
+	return true;
+},
+
+/* deprecated: use it_http::post() instead */
+post: function(baseurl, data)
+{
+	this.clear();
+	this.http = it_http.get_instance();
+	this.http.post(baseurl, data, this.callback);
+},
+
+retryload: function(p)
+{
+	this.load(p.baseurl, p.pos, p.num, p.query_volatile, p.retry);
+},
+
+dataReady: function(data)
+{
+	if ((typeof data == "object"))
+	{
+		this.attr = {};
+
+		for (var key in data)
+		{
+			var value = data[key];
+			var id = key - 0;
+
+			if (!isNaN(id))
+			{
+				this.start = Math.min(this.start, id);
+				this.end = Math.max(this.end, id + 1);
+				this.entry[id] = data[key];
+			}
+			else
+				this.attr[key] = data[key];
+		}
+
+		if (this.attr.eof)
+			this.attr.num = this.end;	/* Fix bogus # of result value */
+
+		this.handler.render(this);
+
+		if (!this.attr.eof && (this.end < this.pos + this.num))
+			this.load(this.baseurl, this.end, this.pos + this.num - this.end);
+
+		it_loader.sequence += "h";
+		this.http = null;
+	}
+},
+
+onerror: function(response)
+{
+	var retry = this.retry + 1;
+
+	if (retry < 10)
+		it_timer({ object: this, method: "retryload", timeout: Math.pow(5, Math.min(retry, 5)), baseurl: this.baseurl, pos: this.pos, num: this.num, query_volatile: this.query_volatile, retry: retry });
+	else
+		ED(response);
+},
+
+stop: function()
+{
+  if (this.http)
+    this.http.stop();
+} /* NO COMMA */
+
+}
+
+// static properties
+it_loader.sequence = "";
-- 
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