/// <summary>
/// Analyzes the first <code>nLines</code> of the ascii stream.
/// </summary>
/// <param name="nLines">The number of lines to analyze. It is no error if the stream contains a less number of lines than provided here.</param>
/// <param name="defaultImportOptions">The default import options.</param>
/// <returns>Import options that can be used in a following step to read in the ascii stream. Null is returned if the stream contains no data.</returns>
public AsciiImportOptions Analyze(int nLines, AsciiImportOptions defaultImportOptions)
{
string sLine;
stream.Position = 0;
System.IO.StreamReader sr = new System.IO.StreamReader(stream, System.Text.Encoding.Default, true);
System.Collections.ArrayList result = new System.Collections.ArrayList();
for (int i = 0; i < nLines; i++)
{
sLine = sr.ReadLine();
if (null == sLine)
{
break;
}
result.Add(new AsciiLineAnalyzer(i, sLine));
}
if (result.Count == 0)
{
return(null); // there is nothing to analyze
}
// now view the results
// calc the frequency o
System.Collections.SortedList sl = new System.Collections.SortedList();
int nItems;
// first the tabs
/*
* sl.Clear();
* for(int i=0;i<result.Count;i++)
* {
* nItems = ((AsciiLineAnalyzer)result[i]).nNumberOfTabs;
* if(0!=nItems)
* {
* if(null==sl[nItems])
* sl.Add(nItems,1);
* else
* sl[nItems] = 1+(int)sl[nItems];
* }
* }
* // get the tab count with the topmost frequency
* int nMaxNumberOfSameTabs = 0;
* int nMaxTabsOfSameNumber = 0;
* for(int i=0;i<sl.Count;i++)
* {
* if(nMaxNumberOfSameTabs<(int)sl.GetByIndex(i))
* {
* nMaxNumberOfSameTabs = (int)sl.GetByIndex(i);
* nMaxTabsOfSameNumber = (int)sl.GetKey(i);
* }
* }
*/
// Count the commas
sl.Clear();
for (int i = 0; i < result.Count; i++)
{
nItems = ((AsciiLineAnalyzer)result[i]).nNumberOfCommas;
if (0 != nItems)
{
if (null == sl[nItems])
{
sl.Add(nItems, 1);
}
else
{
sl[nItems] = 1 + (int)sl[nItems];
}
}
}
// get the comma count with the topmost frequency
int nMaxNumberOfSameCommas = 0;
int nMaxCommasOfSameNumber = 0;
for (int i = 0; i < sl.Count; i++)
{
if (nMaxNumberOfSameCommas < (int)sl.GetByIndex(i))
{
nMaxNumberOfSameCommas = (int)sl.GetByIndex(i);
nMaxCommasOfSameNumber = (int)sl.GetKey(i);
}
}
// Count the semicolons
sl.Clear();
for (int i = 0; i < result.Count; i++)
{
nItems = ((AsciiLineAnalyzer)result[i]).nNumberOfSemicolons;
if (0 != nItems)
{
if (null == sl[nItems])
{
sl.Add(nItems, 1);
}
else
{
sl[nItems] = 1 + (int)sl[nItems];
}
}
}
// get the tab count with the topmost frequency
int nMaxNumberOfSameSemicolons = 0;
int nMaxSemicolonsOfSameNumber = 0;
for (int i = 0; i < sl.Count; i++)
{
if (nMaxNumberOfSameSemicolons < (int)sl.GetByIndex(i))
{
nMaxNumberOfSameSemicolons = (int)sl.GetByIndex(i);
nMaxSemicolonsOfSameNumber = (int)sl.GetKey(i);
}
}
NumberAndStructure[] st = new NumberAndStructure[3];
for (int i = 0; i < 3; i++)
{
st[i].nLines = GetPriorityOf(result, (AsciiLineAnalyzer.Separation)i, ref st[i].structure);
}
// look for the top index
int nMaxLines = int.MinValue;
double maxprtylines = 0;
int nBestSeparator = int.MinValue;
for (int i = 0; i < 3; i++)
{
double prtylines = (double)st[i].nLines * st[i].structure.Priority;
if (prtylines == maxprtylines)
{
if (st[i].nLines > nMaxLines)
{
nMaxLines = st[i].nLines;
nBestSeparator = i;
}
}
else if (prtylines > maxprtylines)
{
maxprtylines = prtylines;
nBestSeparator = i;
nMaxLines = st[i].nLines;
}
}
AsciiImportOptions opt = defaultImportOptions.Clone();
opt.bDelimited = true;
opt.cDelimiter = nBestSeparator == 0 ? '\t' : (nBestSeparator == 1 ? ',' : ';');
opt.recognizedStructure = st[nBestSeparator].structure;
// look how many header lines are in the file by comparing the structure of the first lines with the recognized structure
for (int i = 0; i < result.Count; i++)
{
opt.nMainHeaderLines = i;
if (((AsciiLineAnalyzer)result[i]).structure[nBestSeparator].IsCompatibleWith(opt.recognizedStructure))
{
break;
}
}
// calculate the total statistics of decimal separators
opt.m_DecimalSeparatorCommaCount = 0;
opt.m_DecimalSeparatorDotCount = 0;
for (int i = 0; i < result.Count; i++)
{
opt.m_DecimalSeparatorDotCount += ((AsciiLineAnalyzer)result[i]).structure[nBestSeparator].DecimalSeparatorDotCount;
opt.m_DecimalSeparatorCommaCount += ((AsciiLineAnalyzer)result[i]).structure[nBestSeparator].DecimalSeparatorCommaCount;
}
return(opt);
}
/// <summary>
/// Analyzes the first <code>nLines</code> of the ascii stream.
/// </summary>
/// <param name="nLines">The number of lines to analyze. It is no error if the stream contains a less number of lines than provided here.</param>
/// <param name="defaultImportOptions">The default import options.</param>
/// <returns>Import options that can be used in a following step to read in the ascii stream. Null is returned if the stream contains no data.</returns>
public AsciiImportOptions Analyze(int nLines, AsciiImportOptions defaultImportOptions)
{
string sLine;
stream.Position = 0;
System.IO.StreamReader sr = new System.IO.StreamReader(stream,System.Text.Encoding.Default,true);
System.Collections.ArrayList result = new System.Collections.ArrayList();
for(int i=0;i<nLines;i++)
{
sLine = sr.ReadLine();
if(null==sLine)
break;
result.Add(new AsciiLineAnalyzer(i,sLine));
}
if(result.Count==0)
return null; // there is nothing to analyze
// now view the results
// calc the frequency o
System.Collections.SortedList sl= new System.Collections.SortedList();
int nItems;
// first the tabs
/*
sl.Clear();
for(int i=0;i<result.Count;i++)
{
nItems = ((AsciiLineAnalyzer)result[i]).nNumberOfTabs;
if(0!=nItems)
{
if(null==sl[nItems])
sl.Add(nItems,1);
else
sl[nItems] = 1+(int)sl[nItems];
}
}
// get the tab count with the topmost frequency
int nMaxNumberOfSameTabs = 0;
int nMaxTabsOfSameNumber = 0;
for(int i=0;i<sl.Count;i++)
{
if(nMaxNumberOfSameTabs<(int)sl.GetByIndex(i))
{
nMaxNumberOfSameTabs = (int)sl.GetByIndex(i);
nMaxTabsOfSameNumber = (int)sl.GetKey(i);
}
}
*/
// Count the commas
sl.Clear();
for(int i=0;i<result.Count;i++)
{
nItems = ((AsciiLineAnalyzer)result[i]).nNumberOfCommas;
if(0!=nItems)
{
if(null==sl[nItems])
sl.Add(nItems,1);
else
sl[nItems] = 1+(int)sl[nItems];
}
}
// get the comma count with the topmost frequency
int nMaxNumberOfSameCommas = 0;
int nMaxCommasOfSameNumber = 0;
for(int i=0;i<sl.Count;i++)
{
if(nMaxNumberOfSameCommas<(int)sl.GetByIndex(i))
{
nMaxNumberOfSameCommas = (int)sl.GetByIndex(i);
nMaxCommasOfSameNumber = (int)sl.GetKey(i);
}
}
// Count the semicolons
sl.Clear();
for(int i=0;i<result.Count;i++)
{
nItems = ((AsciiLineAnalyzer)result[i]).nNumberOfSemicolons;
if(0!=nItems)
{
if(null==sl[nItems])
sl.Add(nItems,1);
else
sl[nItems] = 1+(int)sl[nItems];
}
}
// get the tab count with the topmost frequency
int nMaxNumberOfSameSemicolons = 0;
int nMaxSemicolonsOfSameNumber = 0;
for(int i=0;i<sl.Count;i++)
{
if(nMaxNumberOfSameSemicolons<(int)sl.GetByIndex(i))
{
nMaxNumberOfSameSemicolons = (int)sl.GetByIndex(i);
nMaxSemicolonsOfSameNumber = (int)sl.GetKey(i);
}
}
NumberAndStructure[] st = new NumberAndStructure[3];
for(int i=0;i<3;i++)
{
st[i].nLines = GetPriorityOf(result,(AsciiLineAnalyzer.Separation)i,ref st[i].structure);
}
// look for the top index
int nMaxLines = int.MinValue;
double maxprtylines=0;
int nBestSeparator = int.MinValue;
for(int i=0;i<3;i++)
{
double prtylines = (double)st[i].nLines * st[i].structure.Priority;
if(prtylines==maxprtylines)
{
if(st[i].nLines > nMaxLines)
{
nMaxLines = st[i].nLines;
nBestSeparator = i;
}
}
else if(prtylines>maxprtylines)
{
maxprtylines = prtylines;
nBestSeparator = i;
nMaxLines=st[i].nLines;
}
}
AsciiImportOptions opt = defaultImportOptions.Clone();
opt.bDelimited = true;
opt.cDelimiter = nBestSeparator==0 ? '\t' : (nBestSeparator==1 ? ',' : ';');
opt.recognizedStructure = st[nBestSeparator].structure;
// look how many header lines are in the file by comparing the structure of the first lines with the recognized structure
for(int i=0;i<result.Count;i++)
{
opt.nMainHeaderLines=i;
if(((AsciiLineAnalyzer)result[i]).structure[nBestSeparator].IsCompatibleWith(opt.recognizedStructure))
break;
}
// calculate the total statistics of decimal separators
opt.m_DecimalSeparatorCommaCount=0;
opt.m_DecimalSeparatorDotCount=0;
for(int i=0;i<result.Count;i++)
{
opt.m_DecimalSeparatorDotCount += ((AsciiLineAnalyzer)result[i]).structure[nBestSeparator].DecimalSeparatorDotCount;
opt.m_DecimalSeparatorCommaCount += ((AsciiLineAnalyzer)result[i]).structure[nBestSeparator].DecimalSeparatorCommaCount;
}
return opt;
}