/// <summary>
/// This will return the variable values arrays
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public object ReadVariableValue(string name)
{
try
{
NcVar var = GetVar(name);
if (var != null)
{
// Get the number of values of the variables, This would be multiply of each dimension of the variable
int numrecs = (int)var.NumValues;
object[] values = new object[numrecs];
fs.Seek(var.Offset, SeekOrigin.Begin);
for (int i = 0; i < numrecs; ++i)
{
values[i] = ReadValue(var.Type);
}
return((object)values);
}
}
catch (Exception)
{
// Do nothing.
}
return(null); // if variable of the name provided is not found then return null
}
/// <summary>
/// Read the variable attributes and fill it to Ncvar object passed as parameter
/// </summary>
/// <param name="count"></param>
/// <param name="var"></param>
private void ReadVariableAttributes(int count, ref NcVar var)
{
for (int i = 0; i < count; ++i)
{
string str = ReadBytes(0, 4);
int numval = ReadInteger(str); // Get the length of the name of the variable attribute
string attrName = ReadStringName(numval);
int controlNum = ReadInteger(ReadBytes(0, 4));
object attrVal = null;
NcType type = NcType.NcByte;
switch (controlNum)
{
case NC_BYTE:
break;
case NC_CHAR:
//Read variable name length
str = ReadBytes(0, 4);
numval = ReadInteger(str); // Get the length of the attribute value
attrVal = ReadStringName(numval); // Get the attribute value
type = NcType.NcChar;
break;
case NC_INT:
str = ReadBytes(0, 4);
numval = ReadInteger(str); //length of arrary
break;
case NC_FLOAT:
str = ReadBytes(0, 4);
numval = ReadInteger(str); //length of arrary
float[] arrF = new float[numval];
for (int j = 0; j < numval; j++)
{
arrF[j] = ReadFloat(0);
}
attrVal = arrF;
type = NcType.NcFloat;
break;
case NC_DOUBLE:
str = ReadBytes(0, 4);
numval = ReadInteger(str); //length of arrary
double[] arrD = new double[numval];
for (int j = 0; j < numval; j++)
{
arrD[j] = ReadDouble(0);
}
attrVal = arrD;
type = NcType.NcDouble;
break;
}
// Add variable attributes to the varible object here.
NcAtt varAtt = new NcAtt(attrName, type, attrVal);
var.VariableAttributes.Add(varAtt);
}
}
/// <summary>
/// Reads one value for the variable from the nc file.
/// </summary>
/// <param name="varName">variable for which value is to be read</param>
/// <param name="dimNames">name of the dimensions</param>
/// <param name="dimValues">index for the dimension value. The indexes match with the
/// dimNames array</param>
/// <returns></returns>
public object ReadVariableValue(string varName, string[] dimNames, int[] dimValues)
{
try
{
NcVar var = GetVar(varName);
if (null == var)
{
return(null);
}
// We want to get the dimension values for dimenstions which exist for the
// variable.
int[] dimIndexValArray = new int[var.Dimensions.Count];
// Check if the value requested is within the dimensions. If the value
// requested is for a dimension for which this variable does not vary
// then return null.
for (int i = 0; i < dimNames.Length; ++i)
{
bool found = false;
for (int j = 0; j < var.Dimensions.Count; ++j)
{
// If the dimension exists move to the next
if (dimNames[i] == var.Dimensions[j].Name)
{
found = true;
dimIndexValArray[j] = dimValues[i];
break;
}
}
// If the dimension does not exist for the variable and a value is
// requested for this dimension then return null
if (!found && dimValues[i] > 0)
{
return(null);
}
}
if (null == var.ValueArr)
{
object[] values = new object[var.NumValues];
fs.Seek(var.Offset, SeekOrigin.Begin);
for (int i = 0; i < var.NumValues; ++i)
{
values[i] = ReadValue(var.Type);
}
var.ValueArr = values;
}
return(var.GetValue(ref dimIndexValArray));
}
catch (Exception)
{
}
return(null);
}
private bool IfExists(NcVar var)
{
foreach (NcVar myvar in this.variableList)
{
if (string.Compare(myvar.Name, var.Name) == 0)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Fills the NcMetada with file metadata
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
public static NcMetaData GetMetaData(NetCDFReader reader)
{
NcMetaData metadata = new NcMetaData();
//Add No of records
metadata.NumberOfRecords = (int)reader.NumberOfRecords;
//Add Dimensions
Dictionary <uint, INetCDFDimension> .Enumerator dimEnumerator
= reader.Dimensions.GetEnumerator();
while (dimEnumerator.MoveNext())
{
string name = dimEnumerator.Current.Value.Name;
int size = (int)dimEnumerator.Current.Value.Length;
NcDim dim = new NcDim(name, size);
//dim.IsUnlimited = dimEnumerator.Current.Value.IsRecordDimension;
metadata.AddDimension(dim);
}
//Add Global attributes
Dictionary <string, INetCDFAttribute> .Enumerator attrEnumerator
= reader.Attributes.GetEnumerator();
while (attrEnumerator.MoveNext())
{
NcType attType = (NcType)attrEnumerator.Current.Value.DataType;
string attName = attrEnumerator.Current.Key; //Get Attname here
object attValue = attrEnumerator.Current.Value.Value;
NcAtt att = new NcAtt(attName, attType, attValue);
metadata.AddGlobalAttribute(att);
}
//Add Variables
Dictionary <string, INetCDFVariable> .Enumerator varEnumerator
= reader.Variables.GetEnumerator();
while (varEnumerator.MoveNext())
{
string name = varEnumerator.Current.Value.Name;
//object value = varEnumerator.Current.Value;
NcType type = (NcType)varEnumerator.Current.Value.DataType;
NcVar var = new NcVar(name, type);
//Add dimenstions to variables
var.NumValues = (int)varEnumerator.Current.Value.NumValues;
for (int i = 0; i < varEnumerator.Current.Value.DimensionIDs.Length; i++)
{
uint dimID = varEnumerator.Current.Value.DimensionIDs[i];
NcDim dim = new NcDim(reader.Dimensions[dimID].Name, (int)reader.Dimensions[dimID].Length);
var.Dimensions.Insert(i, dim);
}
// Add variable attributes
Dictionary <string, INetCDFAttribute> .Enumerator vattEnumerator
= varEnumerator.Current.Value.Attributes.GetEnumerator();
while (vattEnumerator.MoveNext())
{
NcType attType = (NcType)vattEnumerator.Current.Value.DataType;
string attName = vattEnumerator.Current.Key; //Get Attname here
object attValue = vattEnumerator.Current.Value.Value;
NcAtt att = new NcAtt(attName, attType, attValue);
var.VariableAttributes.Add(att);
}
metadata.AddVariable(var);
}
return(metadata);
}
/// <summary>
/// Reads the variables and add them to the meta data
/// </summary>
/// <param name="count"></param>
private void ReadVariables(int count)
{
for (int i = 0; i < count; ++i)
{
string str = ReadBytes(0, 4);
int stringLength = ReadInteger(str); //get then string lenght of the variable name
str = ReadStringName(stringLength);
NcVar var = new NcVar(str);
//Now read the dimension of the variable
str = ReadBytes(0, 4);
int dimCount = ReadInteger(str);
List <int> dimList = new List <int>();
for (int dCounter = 0; dCounter < dimCount; ++dCounter)
{
// Read the ID of the dimension. This indicates the
// sequence in which the dimensions are declared and that is
// used for this variable.
str = ReadBytes(0, 4);
int dimID = ReadInteger(str);
dimList.Add(dimID);
//If variable has only one dimension , check for co-ordinate variable
if (dimCount == 1)
{
//If Variable Name is same as name of Dimension
if (this.metadata.GetDimension(var.Name) != null)
{
var.IsCoordinate = true;
}
}
var.SetDimensions(dCounter, this.metadata.Dimensions[dimID]);
}
var.Edges = dimList;
int varAttCount = ReadVariableAttributeCount(); // Get the variable's attribute count
if (varAttCount > 0)
{
ReadVariableAttributes(varAttCount, ref var);
}
// After reading all the attribs read the type, size and offset
stringLength = ReadInteger(ReadBytes(0, 4));
switch (stringLength)
{
case 1: var.Type = NcType.NcByte; break;
case 2: var.Type = NcType.NcChar; break;
case 3: var.Type = NcType.NcShort; break;
case 4: var.Type = NcType.NcInt; break;
case 5: var.Type = NcType.NcFloat; break;
case 6: var.Type = NcType.NcDouble; break;
}
int varSize = ReadInteger(ReadBytes(0, 4));
int offset = ReadInteger(ReadBytes(0, 4));
var.Offset = offset;
int bCount = BytesOf(var.Type);
if (bCount == 0)
{
var.NumValues = 0;
}
else
{
var.NumValues = varSize / BytesOf(var.Type);
}
// If the variable is a record variable then set the length of the
// record var
var.SetRecordDimSize();
this.metadata.AddVariable(var);
}
}
public void AddVariable(NcVar var)
{
variableList.Add(var);
}
