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YOUChain Common library in JAVA.

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package cc.youchain.contracts.token;

import java.math.BigInteger;
import java.util.List;

import io.reactivex.Flowable;

import cc.youchain.protocol.core.DefaultBlockParameter;
import cc.youchain.protocol.core.RemoteCall;
import cc.youchain.protocol.core.methods.response.TransactionReceipt;

/**
 * The YOUChain ERC-20 token standard.
 * 
 *     Implementations should provide the concrete ApprovalEventResponse and
 *     TransferEventResponse from their token as the generic types "R" amd "T".
 * 
 */
@SuppressWarnings("unused")
public interface ERC20Interface extends ERC20BasicInterface {

    RemoteCall allowance(String owner, String spender);

    RemoteCall approve(String spender, BigInteger value);

    RemoteCall transferFrom(String from, String to, BigInteger value);

    List getApprovalEvents(TransactionReceipt transactionReceipt);

    Flowable approvalEventFlowable(DefaultBlockParameter startBlock,
                                        DefaultBlockParameter endBlock);

}