Mercurial > browser-couch

annotate browser-couch.js @ 9:8842af55f7fe

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Refactored map-reduce into its own self-contained function that isn't part of a closure
author Atul Varma <varmaa@toolness.com>
date Fri, 10 Apr 2009 11:32:23 -0700
parents bd3a2f82ead2
children 0a694cb579ec
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1 /* ***** BEGIN LICENSE BLOCK *****
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2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 *
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4 * The contents of this file are subject to the Mozilla Public License Version
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5 * 1.1 (the "License"); you may not use this file except in compliance with
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6 * the License. You may obtain a copy of the License at
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7 * http://www.mozilla.org/MPL/
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8 *
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9 * Software distributed under the License is distributed on an "AS IS" basis,
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10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 * for the specific language governing rights and limitations under the
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12 * License.
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13 *
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14 * The Original Code is Ubiquity.
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15 *
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16 * The Initial Developer of the Original Code is Mozilla.
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17 * Portions created by the Initial Developer are Copyright (C) 2007
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18 * the Initial Developer. All Rights Reserved.
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19 *
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20 * Contributor(s):
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21 * Atul Varma <atul@mozilla.com>
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22 *
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23 * Alternatively, the contents of this file may be used under the terms of
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24 * either the GNU General Public License Version 2 or later (the "GPL"), or
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25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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26 * in which case the provisions of the GPL or the LGPL are applicable instead
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27 * of those above. If you wish to allow use of your version of this file only
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28 * under the terms of either the GPL or the LGPL, and not to allow others to
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29 * use your version of this file under the terms of the MPL, indicate your
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30 * decision by deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL or the LGPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this file under
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33 * the terms of any one of the MPL, the GPL or the LGPL.
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34 *
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35 * ***** END LICENSE BLOCK ***** */
2
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36
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37 var BrowserCouch = {
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38 get: function BC_get(name, cb, storage, JSON) {
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39 var self = this;
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40
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41 function createDb() {
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42 cb(new self._DB(name, storage, JSON));
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43 }
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44
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45 if (!storage) {
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46 if (window.globalStorage || window.localStorage) {
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47 if (window.globalStorage)
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48 storage = window.globalStorage[location.hostname];
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49 else
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50 storage = window.localStorage;
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51 if (window.JSON) {
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52 JSON = window.JSON;
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53 createDb();
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54 } else
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55 self._loadScript(
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56 "json2.js",
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57 window,
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58 function() {
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59 if (!window.JSON)
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60 throw new Error('JSON library failed to load');
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61 JSON = window.JSON;
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62 createDb();
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63 });
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64 } else {
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65 /* TODO: Consider using JSPersist or something else here. */
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66 throw new Error('unable to find persistent storage backend');
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67 }
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68 } else
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69 createDb();
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70 },
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71
2
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72 _loadScript: function BC__loadScript(url, window, cb) {
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73 var doc = window.document;
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74 var script = doc.createElement("script");
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75 script.setAttribute("src", url);
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76 script.addEventListener(
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77 "load",
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78 function onLoad() {
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79 script.removeEventListener("load", onLoad, false);
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80 cb();
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81 },
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82 false
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83 );
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84 doc.body.appendChild(script);
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85 },
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86
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87 _DB: function BC__DB(name, storage, JSON) {
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88 var dbName = 'BrowserCouch_DB_' + name;
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89
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90 var documents = [];
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91 var docIdIndex = {};
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92
2
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93 if (dbName in storage && storage[dbName].value) {
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94 var db = JSON.parse(storage[dbName].value);
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95 documents = db.documents;
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96 docIdIndex = db.docIdIndex;
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97 }
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98
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99 function commitToStorage() {
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100 storage[dbName].value = JSON.stringify(
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101 {documents: documents,
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102 docIdIndex: docIdIndex}
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103 );
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104 }
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105
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106 this.wipe = function DB_wipe(cb) {
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107 documents = [];
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108 docIdIndex = {};
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109 commitToStorage();
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110 if (cb)
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111 cb();
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112 };
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113
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114 this.get = function DB_get(id, cb) {
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115 if (id in docIdIndex)
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116 cb(documents[docIdIndex[id]]);
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117 else
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118 cb(null);
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119 };
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120
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121 this.put = function DB_put(document, cb) {
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122 function putSingleDocument(doc) {
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123 if (doc.id in docIdIndex)
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124 documents[docIdIndex[doc.id]] = doc;
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125 else
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126 docIdIndex[doc.id] = documents.push(doc) - 1;
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127 }
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128
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129 if (document.constructor.name == "Array") {
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130 for (var i = 0; i < document.length; i++)
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131 putSingleDocument(document[i]);
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132 } else
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133 putSingleDocument(document);
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134 commitToStorage();
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135 cb();
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136 };
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137
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138 this.view = function DB_view(options) {
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139 if (!options.map)
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140 throw new Error('map function not provided');
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141
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142 BrowserCouch._mapReduce(options.map,
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143 options.reduce,
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144 documents,
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145 options.callback);
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146 };
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147 },
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148
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149 _mapReduce: function BC__mapReduce(map, reduce, documents, cb) {
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150 var mapResult = {};
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151
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152 function emit(key, value) {
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153 // TODO: This assumes that the key will always be
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154 // an indexable value. We may have to hash the value,
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155 // though, if it's e.g. an Object.
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156 if (!mapResult[key])
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157 mapResult[key] = [];
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158 mapResult[key].push(value);
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159 }
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160
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161 for (var i = 0; i < documents.length; i++)
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162 map(documents[i], emit);
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163
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164 if (reduce) {
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165 var keys = [];
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166 var values = [];
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167
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168 for (key in mapResult) {
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169 keys.push(key);
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170 values.push(mapResult[key]);
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171 }
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172
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173 cb(reduce(keys, values));
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174 } else {
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175 var result = [];
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176
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177 for (key in mapResult) {
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178 var values = mapResult[key];
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179 for (i = 0; i < values.length; i++)
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180 result.push([key, values[i]]);
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181 }
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182 cb(result);
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183 }
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184 }
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185 };