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Cherokee DB tools

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package com.cherokeesoft.db.utils.api;


import com.cherokeesoft.db.utils.exception.DataException;
import com.cherokeesoft.db.utils.graph.DataGraph;
import org.apache.commons.collections.CollectionUtils;

import java.util.Collection;

public interface GetModel {
    Collection batchGet(DataGraph dataGraph) throws DataException;

    default M get(DataGraph dataGraph) throws DataException {
        Collection advertises = batchGet(dataGraph);
        if (CollectionUtils.isEmpty(advertises) || advertises.size() == 1) {
            return CollectionUtils.isEmpty(advertises) ? null : advertises.iterator().next();
        } else {
            throw new DataException(String.format("Incorrect result. Expect 1 actual %s", advertises.size()));
        }
    }

}