com.google.visualization.datasource
Class QuerySplitter

java.lang.Object
  com.google.visualization.datasource.QuerySplitter

public final class QuerySplitter
extends java.lang.Object

A utility class for splitting the user query into a data source query and a completion query. The data source query is executed by the data source, the completion query is then executed by the query engine. The splitting is performed based on the capabilities that the data source declares it can handle.

Author:

Yonatan B.Y.

Method Summary

static QueryPair

splitQuery(Query query, Capabilities capabilities) Split the query into a data source query and completion query.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

splitQuery

public static QueryPair splitQuery(Query query,
                                   Capabilities capabilities)
                            throws DataSourceException

Split the query into a data source query and completion query. The data source query runs first directly on the underlying data. The completion query is run by QueryEngine engine on the result of the data source query.

Parameters:

query - The Query to split.

capabilities - The capabilities supported by the data source.

Returns:

A split query.

Throws:

DataSourceException - Thrown if the capabilities are not supported.