Impala Documentation

virtual String Impala::Util::IOBufferChannel::ReadLine ( ) [inline, virtual]

only for ascii (not binary) entities

Reimplemented from Impala::Util::IOBuffer.

Definition at line 98 of file IOBufferChannel.h.

References Impala::Util::IOBuffer::Available(), Impala::Util::IOBuffer::GetPosition(), Read(), and SetPosition().

00099     {
00100         // todo : this is a very inefficient implementation
00101         Int64 available = Available();
00102         Int64 maxLineSize = 16384; // 16 Kb, todo : give user control
00103         if (available < maxLineSize)
00104             maxLineSize = available + 1; // extra space for '\0'
00105         char* buf = new char[maxLineSize];
00106         PositionType start = GetPosition();
00107         Int64 nrRead = Read(buf, maxLineSize); // does SetPosition
00108         Int64 i = 0;
00109         while ((i < maxLineSize) && (buf[i] != '\n'))
00110             i++;
00111         Int64 skipN = (buf[i] == '\n') ? 1 : 0;
00112         SetPosition(start + i + skipN);
00113         if (buf[i-1] == '\r') // strip '\r' if present
00114             i--;
00115         buf[i] = '\0';
00116         String res(buf);
00117         delete buf;
00118         return res;
00119     }

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