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Library is a wrapper for EtherScan API.

There is a newer version: 2.1.0

package io.api.etherscan.model.query.impl;

import io.api.etherscan.core.ILogsApi;
import io.api.etherscan.error.LogQueryException;
import io.api.etherscan.model.query.IQueryBuilder;
import io.api.etherscan.model.query.LogOp;

/**
 * Tuple topic parameter builder for The Event Log API
 *
 * @see LogQueryBuilder
 * @see ILogsApi
 *
 * @author GoodforGod
 * @since 31.10.2018
 */
public class LogTopicTuple extends BaseLogQuery implements IQueryBuilder {

    private final String address;
    private final long startBlock, endBlock;
    private final String topic0, topic1;

    private LogOp topic0_1_opr;

    LogTopicTuple(String address, long startBlock, long endBlock,
                  String topic0, String topic1) {
        this.address = address;
        this.startBlock = startBlock;
        this.endBlock = endBlock;
        this.topic0 = topic0;
        this.topic1 = topic1;
    }

    public LogTopicTuple setOpTopic0_1(LogOp topic0_1_opr) {
        this.topic0_1_opr = topic0_1_opr;
        return this;
    }

    @Override
    public LogQuery build() throws LogQueryException {
        if (topic0_1_opr == null)
            throw new LogQueryException("topic0_1_opr can not be null.");

        return new LogQuery(ADDRESS_PARAM + address
                + FROM_BLOCK_PARAM + startBlock + TO_BLOCK_PARAM + endBlock
                + TOPIC_0_PARAM + topic0
                + TOPIC_1_PARAM + topic1
                + TOPIC_0_1_OPR_PARAM + topic0_1_opr.getOperation());
    }
}