/*
    Reading Data from Hatena Antenna RSS Feeds
*/

/* ------------------------------------------------*/
var account    = "castor";
var listlimit  = 5;

/* ------------------------------------------------*/
//
// Initialize
//
var request;

function reqinit() {
	/*@cc_on @*/
	/*@if (@_jscript_version >= 5)
	    try {
	    	request = new ActiveXObject("Msxml2.XMLHTTP");
	    } catch (e1) {
	    	try {
	    		request = new ActiveXObject("Microsoft.XMLHTTP");
	    	} catch (e2) {
	    		request = false;
	    	}
	    }
	@else
	    request = false;
	@end @*/
	
	if (!request) {
	    try {
	    	request = new XMLHttpRequest();
	    } catch (e) {
	    	request = false;
	    }
	}
}

/* ------------------------------------------------*/
//
// hantenna()
//
function hantenna() {
	reqinit();
    if(request) {
        request.onreadystatechange = RSchange;
        request.open("GET", "/hgateway.cgi?"+ account, true);
        request.send(null);
    }
}

//
// RScahnge()
//
function RSchange() {
    if(request.readyState == 4) {
    	if (request.status == 200) {
	    	var i;
	    	var contents = "";
	    	var response = request.responseXML.documentElement;
	    	var items    = response.getElementsByTagName('item');
    		
	    	for(i=0; (i<items.length && i<listlimit); i++){
	    		contents += linkhtml( items[i], null, "_blank", "Update: "+ datehtml( items[i] ) );
	    		contents += "<br>";
	    	}
    		
	    	if(document.getElementById('hantenna')){
	    		document.getElementById('hantenna').innerHTML = contents;
	    	}
	    }
    }
}

//
// datehtml()
//
function datehtml(item) {
	var html;
	if(window.ActiveXObject) {
		html = item.getElementsByTagName('dc:date')[0].firstChild.data;
	} else {
		html = item.getElementsByTagName('date')[0].firstChild.data;
	}
	html = html.replace(/(\d+)-(\d+)-(\d+)T(\d+):(\d+):(\d+).*/, "$1/$2/$3 $4:$5 ");
	return html;
}

//
// linkhtml()
//
function linkhtml(item, _class, _target, _title) {
	//
	var html;
    html = "<a href = \""+ item.getElementsByTagName('link')[0].firstChild.data +"\" ";
    if(_class)  html += "class  = \""+ _class  +"\" ";
    if(_target) html += "target = \""+ _target +"\" ";
    if(_title)  html += "title  = \""+ _title  +"\" ";
    html += ">";
    html += item.getElementsByTagName('title')[0].firstChild.data;
    html += "</a>";
    
    return html;
}