Initial commit

node_modules/mongodb/lib/operations/index_exists.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const OperationBase = require('./operation').OperationBase;
+const handleCallback = require('../utils').handleCallback;
+const indexInformationDb = require('./db_ops').indexInformation;
+
+class IndexExistsOperation extends OperationBase {
+  constructor(collection, indexes, options) {
+    super(options);
+
+    this.collection = collection;
+    this.indexes = indexes;
+  }
+
+  execute(callback) {
+    const coll = this.collection;
+    const indexes = this.indexes;
+    const options = this.options;
+
+    indexInformationDb(coll.s.db, coll.collectionName, options, (err, indexInformation) => {
+      // If we have an error return
+      if (err != null) return handleCallback(callback, err, null);
+      // Let's check for the index names
+      if (!Array.isArray(indexes))
+        return handleCallback(callback, null, indexInformation[indexes] != null);
+      // Check in list of indexes
+      for (let i = 0; i < indexes.length; i++) {
+        if (indexInformation[indexes[i]] == null) {
+          return handleCallback(callback, null, false);
+        }
+      }
+
+      // All keys found return true
+      return handleCallback(callback, null, true);
+    });
+  }
+}
+
+module.exports = IndexExistsOperation;