public NITFSSegment getSegment(NITFSSegmentType segmentType)
{
for (NITFSSegment seg : segments)
{
if (null != seg && seg.segmentType.Equals(segmentType))
{
return(seg);
}
}
return(null);
}
public NITFSSegment(NITFSSegmentType segmentType, java.nio.ByteBuffer buffer,
int headerStartOffset, int headerLength, int dataStartOffset, int dataLength)
{
this.buffer = buffer;
this.segmentType = segmentType;
this.headerStartOffset = headerStartOffset;
this.headerLength = headerLength;
this.dataStartOffset = dataStartOffset;
this.dataLength = dataLength;
this.savedBufferOffset = buffer.position();
}
private int parseSegment(NITFSSegmentType segType, int nextSegmentOffset)
{
int headerLengthSize = segType.getHeaderLengthSize();
int dataLengthSize = segType.getDataLengthSize();
int numOfSegments = Integer.parseInt(NITFSUtil.getString(this.buffer, 3));
for (int i = 0; i < numOfSegments; i++)
{
int segHeaderLength = Integer.parseInt(NITFSUtil.getString(this.buffer, headerLengthSize));
int seqDataLength = Integer.parseInt(NITFSUtil.getString(this.buffer, dataLengthSize));
int saveOffset = this.buffer.position(); // pass buffer to NITFSSegment to parse their headers' contents
NITFSSegment segment;
switch (segType)
{
case IMAGE_SEGMENT:
segment = new NITFSImageSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case SYMBOL_SEGMENT:
segment = new NITFSSymbolSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case LABEL_SEGMENT:
segment = new NITFSLabelSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case TEXT_SEGMENT:
segment = new NITFSTextSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case DATA_EXTENSION_SEGMENT:
segment = new NITFSDataExtensionSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case RESERVED_EXTENSION_SEGMENT:
segment = new NITFSReservedExtensionSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
case USER_DEFINED_HEADER_SEGMENT:
segment = new RPFUserDefinedHeaderSegment(this.buffer);
break;
case EXTENDED_HEADER_SEGMENT: // // throw exception - wrong parser for EXTENDED_HEADER_SEGMENT
segment = new NITFSExtendedHeaderSegment(this.buffer, nextSegmentOffset, segHeaderLength,
nextSegmentOffset + segHeaderLength, seqDataLength);
break;
default:
throw new NITFSRuntimeException("NITFSReader.UnknownOrUnsupportedSegment", segType.ToString());
}
this.segments.add(segment);
nextSegmentOffset += segHeaderLength + seqDataLength;
buffer.position(saveOffset); // restore offset
}
return(nextSegmentOffset);
}
public NITFSSegment getNITFSSegment(NITFSSegmentType segmentType)
{
return((null != nitfsMsg) ? nitfsMsg.getSegment(segmentType) : null);
}
