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74 lines
3.2 KiB
Java
74 lines
3.2 KiB
Java
/*
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* Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.sql;
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import java.sql.*;
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/**
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* The facility that a disconnected {@code RowSet} object calls on
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* to populate itself with rows of data. A reader (an object implementing the
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* {@code RowSetReader} interface) may be registered with
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* a {@code RowSet} object that supports the reader/writer paradigm.
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* When the {@code RowSet} object's {@code execute} method is
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* called, it in turn calls the reader's {@code readData} method.
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*
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* @since 1.4
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*/
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public interface RowSetReader {
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/**
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* Reads the new contents of the calling {@code RowSet} object.
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* In order to call this method, a {@code RowSet}
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* object must have implemented the {@code RowSetInternal} interface
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* and registered this {@code RowSetReader} object as its reader.
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* The {@code readData} method is invoked internally
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* by the {@code RowSet.execute} method for rowsets that support the
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* reader/writer paradigm.
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*
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* <P>The {@code readData} method adds rows to the caller.
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* It can be implemented in a wide variety of ways and can even
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* populate the caller with rows from a nonrelational data source.
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* In general, a reader may invoke any of the rowset's methods,
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* with one exception. Calling the method {@code execute} will
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* cause an {@code SQLException} to be thrown
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* because {@code execute} may not be called recursively. Also,
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* when a reader invokes {@code RowSet} methods, no listeners
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* are notified; that is, no {@code RowSetEvent} objects are
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* generated and no {@code RowSetListener} methods are invoked.
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* This is true because listeners are already being notified by the method
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* {@code execute}.
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*
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* @param caller the {@code RowSet} object (1) that has implemented the
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* {@code RowSetInternal} interface, (2) with which this reader is
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* registered, and (3) whose {@code execute} method called this reader
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* @throws SQLException if a database access error occurs or this method
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* invokes the {@code RowSet.execute} method
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*/
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void readData(RowSetInternal caller) throws SQLException;
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}
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