org.fisco.bcos.sdk.abi.EventEncoder Maven / Gradle / Ivy
package org.fisco.bcos.sdk.abi;
import java.util.List;
import java.util.stream.Collectors;
import org.fisco.bcos.sdk.abi.datatypes.Event;
import org.fisco.bcos.sdk.abi.datatypes.Type;
import org.fisco.bcos.sdk.crypto.CryptoSuite;
import org.fisco.bcos.sdk.utils.Numeric;
/**
* Ethereum filter encoding. Further limited details are available here.
*/
public class EventEncoder {
private CryptoSuite cryptoSuite;
public EventEncoder(CryptoSuite cryptoSuite) {
this.cryptoSuite = cryptoSuite;
}
public String encode(Event event) {
String methodSignature = buildMethodSignature(event.getName(), event.getParameters());
return buildEventSignature(methodSignature);
}
private String buildMethodSignature(
String methodName, List> parameters) {
StringBuilder result = new StringBuilder();
result.append(methodName);
result.append("(");
String params =
parameters.stream().map(p -> Utils.getTypeName(p)).collect(Collectors.joining(","));
result.append(params);
result.append(")");
return result.toString();
}
public String buildEventSignature(String methodSignature) {
byte[] input = methodSignature.getBytes();
byte[] hash = cryptoSuite.hash(input);
return Numeric.toHexString(hash);
}
/** @return the cryptoSuite */
public CryptoSuite getCryptoSuite() {
return cryptoSuite;
}
/** @param cryptoSuite the cryptoSuite to set */
public void setCryptoSuite(CryptoSuite cryptoSuite) {
this.cryptoSuite = cryptoSuite;
}
}