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Code Issues Releases Wiki Activity

cleanup filtering code in lanwchair dao

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This commit is contained in:
Tankred Hase 2013-06-03 23:08:23 +02:00
parent 5e14aa0215
commit b580506465
1 changed files with 20 additions and 20 deletions
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40
src/js/dao/lawnchair-dao.js
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@ -57,46 +57,46 @@ app.dao.LawnchairDAO = function(Lawnchair) {
* @param num [Number] The number of items to fetch (null means fetch all)
*/
this.list = function(type, offset, num, callback) {
var i, list = [],
var i, from, to,
matchingKeys = [],
parts, timeStr, time;
intervalKeys = [],
list = [];
// get all keys
db.keys(function(keys) {
// check if key begins with type
for (i = 0; i < keys.length; i++) {
if (keys[i].indexOf(type) === 0) {
matchingKeys.push(keys[i]);
keys.forEach(function(key) {
if (key.indexOf(type) === 0) {
matchingKeys.push(key);
}
}
});
// sort keys
matchingKeys.sort();
// if num is null, list all items
num = (num !== null) ? num : matchingKeys.length;
// set window of items to fetch
if (offset + num < matchingKeys.length) {
matchingKeys = matchingKeys.splice(matchingKeys.length - offset - num, num);
} else if (offset + num >= matchingKeys.length && offset < matchingKeys.length) {
matchingKeys = matchingKeys.splice(0, matchingKeys.length - offset);
} else {
matchingKeys = [];
// if num is null, list all items
from = (num) ? matchingKeys.length - offset - num : 0;
to = matchingKeys.length - 1 - offset;
// filter items within requested interval
for (i = 0; i < matchingKeys.length; i++) {
if (i >= from && i <= to) {
intervalKeys.push(matchingKeys[i]);
}
}
// return if there are no matching keys
if (matchingKeys.length === 0) {
if (intervalKeys.length === 0) {
callback(list);
return;
}
// fetch all items from data-store with matching key
db.get(matchingKeys, function(matchingList) {
for (i = 0; i < matchingList.length; i++) {
list.push(matchingList[i].object);
}
db.get(intervalKeys, function(intervalList) {
intervalList.forEach(function(item) {
list.push(item.object);
});
// return only the interval between offset and num
callback(list);