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/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import("jsutils.*");
import("sqlbase.sqlcommon");
import("fastJSON");
import("timer");
jimport("java.lang.System.out.println");
function _sqlbase() {
return sqlcommon.getSqlBase();
}
/**
* Creates a SQL table suitable for storing a mapping from String to JSON value.
* Maximum key length is 128 characters. Has no effect if the table already exists.
*/
function createJSONTable(tableName) {
_sqlbase().createJSONTable(String(tableName));
}
/**
* Retrieves a JavaScript object or value from a table. Returns undefined
* if there is no mapping for the given string key. Requires that the table
* exist.
*/
function getJSON(tableName, stringKey) {
var result = _sqlbase().getJSON(String(tableName), String(stringKey));
if (result) {
return fastJSON.parse(String(result))['x'];
/* performance-testing JSON
var obj1 = timer.time("JSON.parse (json2)", function() {
return JSON.parse(String(result))['x'];
});
var obj2 = timer.time("JSON.parse (fastJSON)", function() {
return fastJSON.parse(String(result))['x'];
});
return obj2;
*/
}
return undefined;
}
function getAllJSON(tableName, start, count) {
var result = _sqlbase().getAllJSON(String(tableName), Number(start), Number(count));
return Array.prototype.map.call(result, function(x) {
return {id: x.id(), value: fastJSON.parse(String(x.value()))['x']};
})
}
function getAllJSONKeys(tableName) {
var result = _sqlbase().getAllJSONKeys(String(tableName));
return Array.prototype.map.call(result, function(x) { return String(x); });
}
/**
* Assigns a JavaScript object or primitive value to a string key in a table.
* Maximum key length is 128 characters. Requires that the table exist.
*/
function putJSON(tableName, stringKey, objectOrValue) {
var obj = ({x:objectOrValue});
var json = fastJSON.stringify(obj);
/* performance-testing JSON
var json1 = timer.time("JSON.stringify (json2)", function() {
return JSON.stringify(obj);
});
var json2 = timer.time("JSON.stringify (fastJSON)", function() {
return fastJSON.stringify(obj);
});
if (json1 != json2) {
println("json strings do not match!");
println("\n\n");
println(json1);
println("\n");
println(json2);
println("\n\n");
}*/
_sqlbase().putJSON(String(tableName), String(stringKey), json);
}
/**
* Removes the mapping for a string key from a table. Requires that the table
* exist.
*/
function deleteJSON(tableName, stringKey) {
_sqlbase().deleteJSON(String(tableName), String(stringKey));
}
/**
* Creates a SQL table suitable for storing a mapping from (key,n) to string.
* The mapping may be sparse, but storage is most efficient when n are consecutive.
* The "length" of the array is not stored and must be externally maintained.
* Maximum key length is 128 characters. This call has no effect if the table
* already exists.
*/
function createStringArrayTable(tableName) {
_sqlbase().createStringArrayTable(String(tableName));
}
/**
* Assigns a string value to a (key,n) pair in a StringArray table. Maximum key length
* is 128 characters. Requires that the table exist.
*/
function putStringArrayElement(tableName, stringKey, n, value) {
_sqlbase().putStringArrayElement(String(tableName), String(stringKey),
Number(n), String(value));
}
/**
* Equivalent to a series of consecutive puts of the elements of valueArray, with the first
* one going to n=startN, the second to n=startN+1, and so on, but much more efficient.
*/
function putConsecutiveStringArrayElements(tableName, stringKey, startN, valueArray) {
var putter = _sqlbase().putMultipleStringArrayElements(String(tableName), String(stringKey));
for(var i=0;i<valueArray.length;i++) {
putter.put(Number(startN)+i, String(valueArray[i]));
}
putter.finish();
}
/**
* Equivalent to a series of puts of the (key,value) entries of the JavaScript object
* nToValue, using as few database operations as possible.
*/
function putDictStringArrayElements(tableName, stringKey, nToValue) {
var nArray = [];
for(var n in nToValue) {
nArray.push(n);
}
nArray.sort(function(a,b) { return Number(a) - Number(b); });
var putter = _sqlbase().putMultipleStringArrayElements(String(tableName), String(stringKey));
nArray.forEach(function(n) {
putter.put(Number(n), String(nToValue[n]));
});
putter.finish();
}
/**
* Retrieves a string value from a StringArray table. Returns undefined
* if there is no mapping for the given (key,n) pair. Requires that the table
* exist.
*/
function getStringArrayElement(tableName, stringKey, n) {
var result = _sqlbase().getStringArrayElement(String(tableName),
String(stringKey), Number(n));
if (result) {
return String(result);
}
return undefined;
}
/**
* Retrieves all values from the database page that contains the mapping for n.
* Properties are added to destMap for n, if present in the database, and any other
* numeric entries in the same page. No return value.
*/
function getPageStringArrayElements(tableName, stringKey, n, destMap) {
var array = _sqlbase().getPageStringArrayElements(String(tableName), String(stringKey), n);
for(var i=0;i<array.length;i++) {
var entry = array[i];
destMap[entry.index()] = String(entry.value());
}
}
/**
* Removes the mapping for a (key,n) pair from a StringArray table. Requires that the table
* exist.
*/
function deleteStringArrayElement(tableName, stringKey, n) {
_sqlbase().putStringArrayElement(String(tableName), String(stringKey), Number(n), null);
}
/**
* Removes all mappings and metadata associated with a given key in a table.
*/
function clearStringArray(tableName, stringKey) {
_sqlbase().clearStringArray(String(tableName), stringKey);
}
function getStringArrayAllKeys(tableName) {
var result = _sqlbase().getStringArrayAllKeys(String(tableName));
return Array.prototype.map.call(result, function(x) { return String(x); });
}
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