private bool ReadOrThrow(IRelationQueue queue)
{
try
{
return(queue.Read());
}
catch (Exception ex)
{
throw RelationException.CannotForwardQueue(this.Relation, queue.Metadata.Identity, ex);
}
}
public IField this[int index]
{
get
{
if (index < 0 || index >= this.Degree)
{
throw RelationException.IndexOutOfRange(this.Relation.Header, index);
}
return(this.Buffer.Fields[index]);
}
}
private void Validate()
{
for (int i = 0; i < this.Attributes.Count; i++)
{
if (this.Attributes[i] == null)
{
throw RelationException.AttributeCannotBeNull(this.Schema, i);
}
else if (!this.Schema.Equals(this.Attributes[i].Schema))
{
throw RelationException.AttributeDoesNotBelongToSchema(this.Schema, this.Attributes[i], i);
}
}
}
private void InitializeHeader()
{
if (this.Header.Count != this.InnerReader.Degree)
{
throw RelationException.InvalidDataReaderHeader(this.InnerReader.Relation.Header, this.Header);
}
this.headerMap = new Dictionary <string, int>();
for (int i = 0; i < this.Header.Count; i++)
{
if (this.Header[i] == null)
{
throw RelationException.DataHeaderCannotBeNull(this.InnerReader.Relation.Header, i);
}
if (this.headerMap.ContainsKey(this.Header[i]))
{
throw RelationException.DataHeaderCannotHaveDupes(this.InnerReader.Relation.Header, this.Header, i);
}
this.headerMap.Add(this.Header[i], i);
}
}
