Package org.bitcoinj.core

Class GetUTXOsMessage

java.lang.Object

org.bitcoinj.core.Message

org.bitcoinj.core.GetUTXOsMessage

public class GetUTXOsMessage
extends Message

This command is supported only by Bitcoin XT nodes, which advertise themselves using the second service bit flag. It requests a query of the UTXO set keyed by a set of outpoints (i.e. tx hash and output index). The result contains a bitmap of spentness flags, and the contents of the associated outputs if they were found. The results aren't authenticated by anything, so the peer could lie, or a man in the middle could swap out its answer for something else. Please consult BIP 65 for more information on this message.

Note that this message does not let you query the UTXO set by address, script or any other criteria. The reason is that Bitcoin nodes don't calculate the necessary database indexes to answer such queries, to save space and time. If you want to look up unspent outputs by address, you can either query a block explorer site, or you can use the FullPrunedBlockChain class to build the required indexes yourself. Bear in that it will be quite slow and disk intensive to do that!

Instances of this class are not safe for use by multiple threads.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MIN_PROTOCOL_VERSION
static final long	SERVICE_FLAGS_REQUIRED	Bitmask of service flags required for a node to support this command (0x3)

Fields inherited from class org.bitcoinj.core.Message

cursor, length, MAX_SIZE, offset, params, payload, recached, serializer, UNKNOWN_LENGTH

Constructor Summary

Constructors

Constructor	Description
GetUTXOsMessage(NetworkParameters params, byte[] payloadBytes)
GetUTXOsMessage(NetworkParameters params, List<TransactionOutPoint> outPoints, boolean includeMempool)

Method Summary

Modifier and Type	Method	Description
protected void	bitcoinSerializeToStream(OutputStream stream)	Serializes this message to the provided stream.
boolean	equals(Object o)
boolean	getIncludeMempool()
com.google.common.collect.ImmutableList<TransactionOutPoint>	getOutPoints()
int	hashCode()
protected void	parse()

Methods inherited from class org.bitcoinj.core.Message

adjustLength, bitcoinSerialize, bitcoinSerialize, getHash, getMessageSize, getParams, hasMoreBytes, isCached, isRecached, readByte, readByteArray, readBytes, readHash, readInt64, readStr, readUint32, readUint64, readVarInt, readVarInt, setSerializer, unCache, unsafeBitcoinSerialize

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Details

MIN_PROTOCOL_VERSION

public static final int MIN_PROTOCOL_VERSION

See Also:

• Constant Field Values

SERVICE_FLAGS_REQUIRED

public static final long SERVICE_FLAGS_REQUIRED

Bitmask of service flags required for a node to support this command (0x3)

See Also:

• Constant Field Values

Constructor Details

GetUTXOsMessage

public GetUTXOsMessage(NetworkParameters params,
 List<TransactionOutPoint> outPoints,
 boolean includeMempool)

GetUTXOsMessage

public GetUTXOsMessage(NetworkParameters params,
 byte[] payloadBytes)

Method Details

parse

protected void parse()
              throws ProtocolException

Specified by:

parse in class Message

Throws:

ProtocolException

getIncludeMempool

public boolean getIncludeMempool()

getOutPoints

public com.google.common.collect.ImmutableList<TransactionOutPoint> getOutPoints()

bitcoinSerializeToStream

protected void bitcoinSerializeToStream(OutputStream stream)
                                 throws IOException

Description copied from class: Message

Serializes this message to the provided stream. If you just want the raw bytes use bitcoinSerialize().

Overrides:

bitcoinSerializeToStream in class Message

Throws:

IOException

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object