list转迭代器Iterator

List<Map<String, Object>> list = sqlSession.selectList("com.xxx.xxxMapper.execSql", selectParameter);
private Cursor<Map<String, Object>> cursor = new ListCursorAdapter<>(list);
private Iterator<Map<String, Object>> cursorIterator = cursor.iterator();

import org.apache.ibatis.cursor.Cursor;
import org.apache.ibatis.exceptions.PersistenceException;
import org.jetbrains.annotations.NotNull;
import java.util.Iterator;
import java.util.List;
public class ListCursorAdapter<T> implements Cursor<T> {
    private final Iterator<T> iterator;
    private boolean isOpen = true;
    public ListCursorAdapter(List<T> list) {
        this.iterator = list.iterator();
    }
    @Override
    public boolean isOpen() {
        return isOpen;
    }
    @Override
    public boolean isConsumed() {
        return false;
    }
    @Override
    public int getCurrentIndex() {
        return 0;
    }
    public T getCurrentValue() {
        if (!iterator.hasNext()) {
            throw new PersistenceException("Cursor is not on a valid row");
        }
        return iterator.next();
    }
    public boolean next() {
        return iterator.hasNext() && iterator.next() != null;
    }
    @Override
    public void close() {
        isOpen = false;
    }
    @NotNull
    @Override
    public Iterator<T> iterator() {
        return iterator;
    }
}