/**
* Constructor
*
* @param name the name of the POIFSDocument
* @param stream the InputStream we read data from
*/
public OPOIFSDocument(String name, POIFSBigBlockSize bigBlockSize, InputStream stream)
throws IOException {
List<DocumentBlock> blocks = new ArrayList<DocumentBlock>();
_size = 0;
_bigBigBlockSize = bigBlockSize;
while (true) {
DocumentBlock block = new DocumentBlock(stream, bigBlockSize);
int blockSize = block.size();
if (blockSize > 0) {
blocks.add(block);
_size += blockSize;
}
if (block.partiallyRead()) {
break;
}
}
DocumentBlock[] bigBlocks = blocks.toArray(new DocumentBlock[blocks.size()]);
_big_store = new BigBlockStore(bigBlockSize, bigBlocks);
_property = new DocumentProperty(name, _size);
_property.setDocument(this);
if (_property.shouldUseSmallBlocks()) {
_small_store =
new SmallBlockStore(
bigBlockSize, SmallDocumentBlock.convert(bigBlockSize, bigBlocks, _size));
_big_store = new BigBlockStore(bigBlockSize, new DocumentBlock[0]);
} else {
_small_store = new SmallBlockStore(bigBlockSize, EMPTY_SMALL_BLOCK_ARRAY);
}
}
/** @return the DocumentBlocks */
DocumentBlock[] getBlocks() {
if (isValid() && _writer != null) {
ByteArrayOutputStream stream = new ByteArrayOutputStream(_size);
DocumentOutputStream dstream = new DocumentOutputStream(stream, _size);
_writer.processPOIFSWriterEvent(new POIFSWriterEvent(dstream, _path, _name, _size));
bigBlocks = DocumentBlock.convert(_bigBlockSize, stream.toByteArray(), _size);
}
return bigBlocks;
}
/** @return <code>null</code> if <tt>offset</tt> points to the end of the document stream */
DataInputBlock getDataInputBlock(int offset) {
if (offset >= _size) {
if (offset > _size) {
throw new RuntimeException("Request for Offset " + offset + " doc size is " + _size);
}
return null;
}
if (_property.shouldUseSmallBlocks()) {
return SmallDocumentBlock.getDataInputBlock(_small_store.getBlocks(), offset);
}
return DocumentBlock.getDataInputBlock(_big_store.getBlocks(), offset);
}
/**
* write the blocks to a stream
*
* @param stream the stream to which the data is to be written
*/
void writeBlocks(OutputStream stream) throws IOException {
if (isValid()) {
if (_writer != null) {
DocumentOutputStream dstream = new DocumentOutputStream(stream, _size);
_writer.processPOIFSWriterEvent(new POIFSWriterEvent(dstream, _path, _name, _size));
dstream.writeFiller(
countBlocks() * _bigBlockSize.getBigBlockSize(), DocumentBlock.getFillByte());
} else {
for (int k = 0; k < bigBlocks.length; k++) {
bigBlocks[k].writeBlocks(stream);
}
}
}
}