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package net.dongliu.dbutils.sqlbuilder;

import javax.annotation.Nonnull;
import java.util.Collections;

/**
 * The parent SQL node
 *
 * @author Liu Dong
 */
public abstract class SQLNode {

    /**
     * Get <sql string stream, param, param stream> this node should return
     */
    @Nonnull
    protected abstract SQLSegment segment();

    protected static final SQLNode empty = new SQLNode() {
        @Nonnull
        @Override
        public SQLSegment segment() {
            return new SQLSegment(Collections.emptyList(), Collections.emptyList());
        }
    };

}