Class EvmTopicFilter

Predicate filter on an EVM event-log topic position (topic0 … topic3) on the contract-logs endpoints. Construct via Is(int, BigInteger); the ctor is private.

Inheritance

object

EvmTopicFilter

Implements

IMirrorFilter

IMirrorQueryParameter

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Hiero.Mirror.Filters

Assembly: Hiero.dll

Syntax

public sealed class EvmTopicFilter : IMirrorFilter, IMirrorQueryParameter

Remarks

"Topic" here is the Ethereum event-log topic (one of up to four indexed parameters of an emitted event), not an HCS topic id. Each factory call produces one filter bound to a specific index slot (0–3) — pass multiple instances with different indices to constrain more than one topic.

Properties

Name

The query parameter name recognized by the remote mirror node — topic0 through topic3 depending on index.

Declaration

public string Name { get; }

Property Value

Type	Description
string

Value

The value of the query parameter sent to the mirror node.

Declaration

public string Value { get; }

Property Value

Type	Description
string

Methods

Is(int, BigInteger)

Records whose EVM event-log topic at position index equals the given value.

Declaration

public static EvmTopicFilter Is(int index, BigInteger topic)

Parameters

Type	Name	Description
int	index	The topic slot, 0 through 3 inclusive.
BigInteger	topic	The topic value (padded to 32 bytes on the wire). A negative value, as a signed parse of a topic with its top bit set gives, stands for its 256-bit two's complement.

Returns

Type	Description
EvmTopicFilter

Exceptions

Type	Condition
ArgumentOutOfRangeException	Thrown when index is outside the 0–3 range.

Implements

IMirrorFilter

IMirrorQueryParameter