/** "Find the appropriate BlockProcessor for the given block type code." [DTN2] */
public static BlockProcessor find_processor(bundle_block_type_t type) {
Iterator<BlockProcessor> iter = processors_.iterator();
while (iter.hasNext()) {
BlockProcessor bp = iter.next();
if (bp.block_type() == type) {
return bp;
}
}
return null;
}
/**
* "Generate a BlockInfoVec for the outgoing link and put it into xmit_blocks_." [DTN2]
*
* @return a list of new BLockInfo
*/
public static BlockInfoVec prepare_blocks(Bundle bundle, final Link link) {
// "create a new block list for the outgoing link by first calling
// prepare on all the BlockProcessor classes for the blocks that
// arrived on the link" [DTN2]
BlockInfoVec xmit_blocks = bundle.xmit_link_block_set().create_blocks(link);
BlockInfoVec recv_blocks = bundle.recv_blocks();
if (recv_blocks.size() > 0) {
// "if there is a received block, the first one better be the primary"
// [DTN2]
assert (recv_blocks.front().type() == bundle_block_type_t.PRIMARY_BLOCK);
Iterator<BlockInfo> iter = recv_blocks.iterator();
while (iter.hasNext()) {
BlockInfo block = iter.next();
if (bundle.fragmented_incoming()
&& xmit_blocks.find_block(BundleProtocol.bundle_block_type_t.PAYLOAD_BLOCK) != null) {
continue;
}
block
.owner()
.prepare(bundle, xmit_blocks, block, link, BlockInfo.list_owner_t.LIST_RECEIVED);
}
} else {
BPF.getInstance().getBPFLogger().debug(TAG, "adding primary and payload block");
BlockProcessor bp = find_processor(BundleProtocol.bundle_block_type_t.PRIMARY_BLOCK);
bp.prepare(bundle, xmit_blocks, null, link, BlockInfo.list_owner_t.LIST_NONE);
bp = find_processor(bundle_block_type_t.PAYLOAD_BLOCK);
bp.prepare(bundle, xmit_blocks, null, link, BlockInfo.list_owner_t.LIST_NONE);
}
// "now we also make sure to prepare() on any registered processors
// that don't already have a block in the output list. this
// handles the case where we have a locally generated block with
// nothing in the recv_blocks vector" [DTN2]
Iterator<BlockProcessor> itr = processors_.iterator();
while (itr.hasNext()) {
BlockProcessor bp = itr.next();
if (!xmit_blocks.has_block(bp.block_type())) {
bp.prepare(bundle, xmit_blocks, null, link, BlockInfo.list_owner_t.LIST_NONE);
}
}
// Now prepare security blocks
BPF.getInstance().getBPFLogger().debug(TAG, "Now preparing security blocks...");
Security.prepare_out_blocks(bundle, link, xmit_blocks);
return xmit_blocks;
}