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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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10
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11 import java.sql.*;
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12
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13 /**
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14 * A Wrapper class that implements nothing.
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15 *
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16 * This Class is used to simply provide JDBC4 Wrapper functions, for as
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17 * long as we don't really understand that they are for and what they
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18 * are supposed to do. Hence the implementations are very stupid and
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19 * non-useful, ignoring any argument and claiming stuff doesn't work, or
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20 * won't work out.
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21 *
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22 * @author Fabian Groffen
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23 * @version 1.0
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24 */
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25 public class MonetWrapper implements Wrapper {
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26 /**
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27 * Returns true if this either implements the interface argument or
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28 * is directly or indirectly a wrapper for an object that does.
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29 * Returns false otherwise. If this implements the interface then
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30 * return true, else if this is a wrapper then return the result of
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31 * recursively calling isWrapperFor on the wrapped object. If this
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32 * does not implement the interface and is not a wrapper, return
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33 * false. This method should be implemented as a low-cost operation
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34 * compared to unwrap so that callers can use this method to avoid
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35 * expensive unwrap calls that may fail. If this method returns true
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36 * then calling unwrap with the same argument should succeed.
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37 *
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38 * @param iface a Class defining an interface.
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39 * @return true if this implements the interface or directly or
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40 * indirectly wraps an object that does.
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41 * @throws SQLException if an error occurs while determining
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42 * whether this is a wrapper for an object with the given
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43 * interface.
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44 */
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45 @Override
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46 public boolean isWrapperFor(Class<?> iface) throws SQLException {
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47 return false;
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48 }
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49
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50 /**
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51 * Returns an object that implements the given interface to allow
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52 * access to non-standard methods, or standard methods not exposed
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53 * by the proxy. If the receiver implements the interface then the
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54 * result is the receiver or a proxy for the receiver. If the
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55 * receiver is a wrapper and the wrapped object implements the
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56 * interface then the result is the wrapped object or a proxy for
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57 * the wrapped object. Otherwise return the the result of calling
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58 * unwrap recursively on the wrapped object or a proxy for that
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59 * result. If the receiver is not a wrapper and does not implement
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60 * the interface, then an SQLException is thrown.
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61 *
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62 * @param iface A Class defining an interface that the result must
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63 * implement.
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64 * @return an object that implements the interface. May be a proxy
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65 * for the actual implementing object.
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66 * @throws SQLException If no object found that implements the
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67 * interface
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68 */
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69 @Override
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70 public <T> T unwrap(Class<T> iface) throws SQLException {
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71 throw new SQLException("No object found (not implemented)", "0A000");
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72 }
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73 }