import net.sf.jsqlparser.statement.select.FromItemVisitor; //导入依赖的package包/类
public SelectMongoCommand withSelect(PlainSelect select) {
    this.select = select;
    this.select.getFromItem().accept(new FromItemVisitor() {
        @Override
        public void visit(SubJoin subJoin) {
        }

        @Override
        public void visit(SubSelect subSelect) {
        }

        @Override
        public void visit(Table table) {
            collection = table.getName();
        }
    });
    return this;
}
 

import net.sf.jsqlparser.statement.select.FromItemVisitor; //导入依赖的package包/类
@Override
public void visit(Merge merge) {
    tables.add(merge.getTable().getName());
    if (merge.getUsingTable() != null) {
        merge.getUsingTable().accept(this);
    } else if (merge.getUsingSelect() != null) {
        merge.getUsingSelect().accept((FromItemVisitor) this);
    }
}
 

import net.sf.jsqlparser.statement.select.FromItemVisitor; //导入依赖的package包/类
@Override
public void accept(FromItemVisitor fromItemVisitor) {
    fromItemVisitor.visit(this);
}
 

import net.sf.jsqlparser.statement.select.FromItemVisitor; //导入依赖的package包/类
public void accept(FromItemVisitor fromItemVisitor) {
	fromItemVisitor.visit(this);
}