1 files changed, 205 insertions, 0 deletions
diff --git a/infrastructure/framework-src/modules/sqlbase/sqlbase.js b/infrastructure/framework-src/modules/sqlbase/sqlbase.js
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+++ b/infrastructure/framework-src/modules/sqlbase/sqlbase.js
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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); });
+}