private IRecordFilter _GetFilter(string inputTypeString, Hashtable assemblyLocations)
{
CSharpRecordFilterBuilder builder = new CSharpRecordFilterBuilder(inputTypeString, assemblyLocations);
if (_whereClause != null) {
builder.WhereClause = _whereClause;
}
else if (_cSharpSnippetFile != null) {
builder.SetCSharpSnippetFile(_cSharpSnippetFile);
}
else throw new Exception("must provide whereClause or snippet file");
IRecordFilter filter = builder.GetFilter(out _filterDllLocation);
if (filter is ISetRecordSource) {
// if this filter implements IRecordSourceAccess then
// we use it to set the RecordSource so the filter
// itself will have access to it.
RecordSource wrapper = new RecordSource(_processor);
wrapper.InternalSource = _input;
((ISetRecordSource)filter).Source = wrapper;
}
return filter;
}
// if inner==true, does inner Join else does leftOuter Join
private RecordSource _Join(RecordSource left, RecordSource right, bool inner)
{
bool requiresSorting = true;
bool ascending = true;
PairFilter filter = null;
if (inner) filter = new InnerJoin(TableColumnSeparator);
else filter = new LeftOuterJoin(TableColumnSeparator);
// T = TypeSort asked for, either Ascending or Descending
// Right
// !T T
// l !T sbT slT
// e
// f T srT X
// t
if (requiresSorting) {
if (!left.InternalSource.Sorting.IsSorted || left.InternalSource.Sorting.IsSortedAscending != ascending) {
left.SortReduce(ascending, false);
}
if (!right.InternalSource.Sorting.IsSorted || right.InternalSource.Sorting.IsSortedAscending != ascending) {
right.SortReduce(ascending, false);
}
}
RecordSource source2BoperatedOn = new RecordSource(this);
source2BoperatedOn.InternalSource = filter;
filter.AddInput(left.InternalSource);
filter.AddInput(right.InternalSource);
return source2BoperatedOn;
}
public void Push(RecordSource source)
{
_stack.Add(source);
}
/// <summary>
/// Pass through only those records with key matching the query expression.
/// The expression can be either a literal string or end with a * to denote
/// prefix matching.
/// </summary>
/// <param name="input">The input source to be queried.</param>
/// <param name="query">The query to be matched.</param>
/// <returns></returns>
public RecordSource QueryKey(RecordSource input, string query)
{
QuerySource querier = new QuerySource(query);
querier.AddInput(input.InternalSource);
RecordSource source2Bqueried = new RecordSource(this);
source2Bqueried.InternalSource = querier;
return source2Bqueried;
}
/// <summary>
/// Selects records from a RecordSource using a user provided whereClause. The user
/// is assumed to know the record type. For example with a text file input the record
/// type is the generic DataRecord so a filter might be "record.Key[0] == 'A'" to filter
/// all records except those that begin with 'A'.
/// </summary>
/// <param name="input">The input RecordSource.</param>
/// <param name="whereClause">The select clause</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource SelectFilter(RecordSource input, string whereClause)
{
whereClause = whereClause.Replace("^", "\"");
DynamicRecordFilter filter = new DynamicRecordFilter(this, whereClause);
filter.AddInput(input.InternalSource);
RecordSource source2Bfiltered = new RecordSource(this);
source2Bfiltered.InternalSource = filter;
return source2Bfiltered;
}
/// <summary>
/// JoinInner
/// </summary>
/// <param name="left">One of two RecordSources</param>
/// <param name="right">One of two RecordSources</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource LeftOuterJoin(RecordSource left, RecordSource right)
{
return _Join(left, right, false);
}
/// <summary>
/// Pair performs operations two input RecordSources, left and right. These are, for
/// example, CatLeftThenRight, SortedMerge, FilterLeftByRightKey.
/// </summary>
/// <param name="left">One of two RecordSources</param>
/// <param name="right">One of two RecordSources</param>
/// <param name="pairOperation">The operation to perform on the input sources</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource Pair(RecordSource left, RecordSource right, PairOperation pairOperation)
{
PairFilter filter = null;
bool requiresSorting = false; // not all pair operations require inputs sorted
bool ascending = true;
switch (pairOperation) {
case PairOperation.FilterLeftInRight:
filter = new FilterLeftByRightKey(true);
requiresSorting = true;
break;
case PairOperation.FilterLeftNotInRight:
filter = new FilterLeftByRightKey(false);
requiresSorting = true;
break;
case PairOperation.MergeAscend:
filter = new SortedMerge(true);
requiresSorting = true;
ascending = true;
break;
case PairOperation.MergeDescend:
filter = new SortedMerge(false);
requiresSorting = true;
ascending = false;
break;
case PairOperation.CatLeftThenRight:
filter = new CatLeftThenRight();
requiresSorting = false;
break;
}
// T = TypeSort asked for, either Ascending or Descending
// Right
// !T T
// l !T sbT slT
// e
// f T srT X
// t
if (requiresSorting) {
if (!left.InternalSource.Sorting.IsSorted || left.InternalSource.Sorting.IsSortedAscending != ascending) {
left.SortReduce(ascending, false);
}
if (!right.InternalSource.Sorting.IsSorted || right.InternalSource.Sorting.IsSortedAscending != ascending) {
right.SortReduce(ascending, false);
}
}
RecordSource source2BoperatedOn = new RecordSource(this);
source2BoperatedOn.InternalSource = filter;
filter.AddInput(left.InternalSource);
filter.AddInput(right.InternalSource);
return source2BoperatedOn;
}
/// <summary>
/// Allows user to define programmatic source using SourceDelegate.
/// </summary>
/// <param name="sourceDelegate">SourceDelegate returning DataRecords and null and end of source.</param>
/// <returns>RecordSource</returns>
public RecordSource Input(SourceDelegate sourceDelegate)
{
RecordSource source2Bmapped = new RecordSource(this);
InternalRecordSource source = new InternalUserSource(sourceDelegate);
source2Bmapped.InternalSource = _AddLogging(source);
return source2Bmapped;
}
/// <summary>
/// Creates a record source out of 3 possible input types:
/// 1) A searchable TStore
/// 2) A streamable RecordsFile
/// 3) A streamable FlatFile
/// </summary>
/// <param name="inputType">The type of input</param>
/// <param name="pathInfo">The path to the input</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource Input(TStoreInputType inputType, string pathInfo)
{
InternalRecordSource source = null;
switch (inputType) {
case TStoreInputType.RecordFile:
source = new InternalRecordFileReader(pathInfo);
break;
case TStoreInputType.TStore:
TMSNStoreReader reader = new TMSNStoreReader(pathInfo, true);
source = reader.RecordSource;
break;
case TStoreInputType.FlatFile:
source = new FlatFileMapper(pathInfo);
break;
case TStoreInputType.Directory:
source = new DirectoryMapper(pathInfo);
break;
}
source.ProcessTreeComment = "[" + pathInfo + "]";
RecordSource source2Bmapped = new RecordSource(this);
source2Bmapped.InternalSource = _AddLogging(source);
return source2Bmapped;
}
/// <summary>
/// JoinInner
/// </summary>
/// <param name="left">One of two RecordSources</param>
/// <param name="right">One of two RecordSources</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource InnerJoin(RecordSource left, RecordSource right)
{
return _Join(left, right, true);
}
/// <summary>
/// This operation on a record source converts it to a source containing
/// DataRecords with information about the source itself. The records of
/// the input source are ignored completely and information like source name,
/// estimated size, sorted-ness, etc. flow from the source.
/// </summary>
/// <param name="input">Input record source.</param>
/// <returns>Output Records source.</returns>
public RecordSource GetStatistics(RecordSource input)
{
// this is implemented like a filter.
StatisticsPseudoFilter filter = new StatisticsPseudoFilter(input.InternalSource);
RecordFilterDriver filterDriver = new RecordFilterDriver(filter);
filterDriver.AddInput(input.InternalSource);
RecordSource source2Bfiltered = new RecordSource(this);
source2Bfiltered.InternalSource = filterDriver;
return source2Bfiltered;
}
/// <summary>
/// Filters the RecordSource by using a user proviced CSharpFilterFile. The IRecordsFilter
/// within the file is compiled on the fly and inserted after the input RecordSource. If
/// a non-existant file is provided the method will print template file which can be modified
/// by the user.
/// </summary>
/// <param name="input">The input RecordSource.</param>
/// <param name="cSharpFilterFile">The csharp file containing a IRecordFilter definition.</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource FilterByCSharpSnippet(RecordSource input, string cSharpFilterFile)
{
DynamicRecordFilter filter = new DynamicRecordFilter(cSharpFilterFile, this);
filter.AddInput(input.InternalSource);
RecordSource source2Bfiltered = new RecordSource(this);
source2Bfiltered.InternalSource = filter;
return source2Bfiltered;
}
/// <summary>
/// Filters a RecordSource using a user provided filter
/// </summary>
/// <param name="input">The input record source</param>
/// <param name="filter">The user provided recordFilter</param>
/// <returns>A RecordSource for further processing</returns>
public RecordSource Filter(RecordSource input, IRecordFilter filter)
{
if (filter is ISetRecordSource) {
// if this filter implements IRecordSourceAccess then
// we use it to set the RecordSource so the filter
// itself will have access to it.
((ISetRecordSource)filter).Source = input;
}
RecordFilterDriver filterDriver = new RecordFilterDriver(filter);
filterDriver.AddInput(input.InternalSource);
RecordSource source2Bfiltered = new RecordSource(this);
source2Bfiltered.InternalSource = filterDriver;
return source2Bfiltered;
}
/// <summary>
/// A RecordSource with zero records.
/// </summary>
/// <returns>A RecordSource for further processing</returns>
public RecordSource EmptySource(bool isSorted, bool isSortedAscending)
{
RecordSource emptySource = new RecordSource(this);
emptySource.InternalSource = new EmptyInternalSource();
emptySource.InternalSource.Sorting.IsSorted = isSorted;
emptySource.InternalSource.Sorting.IsSortedAscending = isSortedAscending;
return emptySource;
}
