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/*
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* Copyright (c) 2003, 2006, 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.rowset.serial;
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import java.sql.*;
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import java.io.*;
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/**
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* A serialized mapping in the Java programming language of an SQL
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* <code>CLOB</code> value.
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* <P>
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* The <code>SerialClob</code> class provides a constructor for creating
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* an instance from a <code>Clob</code> object. Note that the <code>Clob</code>
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* object should have brought the SQL <code>CLOB</code> value's data over
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* to the client before a <code>SerialClob</code> object
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* is constructed from it. The data of an SQL <code>CLOB</code> value can
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* be materialized on the client as a stream of Unicode characters.
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* <P>
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* <code>SerialClob</code> methods make it possible to get a substring
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* from a <code>SerialClob</code> object or to locate the start of
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* a pattern of characters.
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*
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* @author Jonathan Bruce
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*/
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public class SerialClob implements Clob, Serializable, Cloneable {
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/**
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* A serialized array of characters containing the data of the SQL
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* <code>CLOB</code> value that this <code>SerialClob</code> object
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* represents.
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*
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* @serial
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*/
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private char buf[];
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/**
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* Internal Clob representation if SerialClob is intialized with a
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* Clob
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*/
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private Clob clob;
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/**
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* The length in characters of this <code>SerialClob</code> object's
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* internal array of characters.
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*
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* @serial
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*/
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private long len;
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/**
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* The original length in characters of tgus <code>SerialClob</code>
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* objects internal array of characters.
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*
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* @serial
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*/
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private long origLen;
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/**
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* Constructs a <code>SerialClob</code> object that is a serialized version of
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* the given <code>char</code> array.
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* <p>
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* The new <code>SerialClob</code> object is initialized with the data from the
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* <code>char</code> array, thus allowing disconnected <code>RowSet</code>
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* objects to establish a serialized <code>Clob</code> object without touching
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* the data source.
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*
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* @param ch the char array representing the <code>Clob</code> object to be
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* serialized
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* @throws SerialException if an error occurs during serialization
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* @throws SQLException if a SQL error occurs
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*/
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public SerialClob(char ch[]) throws SerialException, SQLException {
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// %%% JMB. Agreed. Add code here to throw a SQLException if no
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// support is available for locatorsUpdateCopy=false
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// Serializing locators is not supported.
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len = ch.length;
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buf = new char[(int)len];
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for (int i = 0; i < len ; i++){
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buf[i] = ch[i];
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}
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origLen = len;
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}
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/**
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* Constructs a <code>SerialClob</code> object that is a serialized
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* version of the given <code>Clob</code> object.
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* <P>
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* The new <code>SerialClob</code> object is initialized with the
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* data from the <code>Clob</code> object; therefore, the
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* <code>Clob</code> object should have previously brought the
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* SQL <code>CLOB</code> value's data over to the client from
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* the database. Otherwise, the new <code>SerialClob</code> object
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* object will contain no data.
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* <p>
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* Note: The <code>Clob</code> object supplied to this constructor cannot
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* return <code>null</code> for the <code>Clob.getCharacterStream()</code>
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* and <code>Clob.getAsciiStream</code> methods. This <code>SerialClob</code>
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* constructor cannot serialize a <code>Clob</code> object in this instance
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* and will throw an <code>SQLException</code> object.
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*
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* @param clob the <code>Clob</code> object from which this
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* <code>SerialClob</code> object is to be constructed; cannot be null
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* @throws SerialException if an error occurs during serialization
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* @throws SQLException if a SQL error occurs in capturing the CLOB;
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* if the <code>Clob</code> object is a null; or if both the
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* <code>Clob.getCharacterStream()</code> and <code>Clob.getAsciiStream()</code>
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* methods on the <code>Clob</code> return a null
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* @see java.sql.Clob
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*/
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public SerialClob(Clob clob) throws SerialException, SQLException {
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if (clob == null) {
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throw new SQLException("Cannot instantiate a SerialClob " +
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"object with a null Clob object");
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}
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len = clob.length();
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this.clob = clob;
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buf = new char[(int)len];
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int read = 0;
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int offset = 0;
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BufferedReader reader;
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if ( (((reader = new BufferedReader(clob.getCharacterStream())) == null)) &&
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(clob.getAsciiStream() == null)) {
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throw new SQLException("Invalid Clob object. Calls to getCharacterStream " +
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"and getAsciiStream return null which cannot be serialized.");
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}
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try {
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do {
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read = reader.read(buf, offset, (int)(len - offset));
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offset += read;
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} while (read > 0);
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} catch (java.io.IOException ex) {
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throw new SerialException("SerialClob: " + ex.getMessage());
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}
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origLen = len;
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}
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/**
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* Retrieves the number of characters in this <code>SerialClob</code>
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* object's array of characters.
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*
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* @return a <code>long</code> indicating the length in characters of this
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* <code>SerialClob</code> object's array of character
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* @throws SerialException if an error occurs
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*/
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public long length() throws SerialException {
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return len;
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}
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/**
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* Returns this <code>SerialClob</code> object's data as a stream
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* of Unicode characters. Unlike the related method, <code>getAsciiStream</code>,
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* a stream is produced regardless of whether the <code>SerialClob</code> object
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* was created with a <code>Clob</code> object or a <code>char</code> array.
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*
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* @return a <code>java.io.Reader</code> object containing this
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* <code>SerialClob</code> object's data
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* @throws SerialException if an error occurs
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*/
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public java.io.Reader getCharacterStream() throws SerialException {
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return (java.io.Reader) new CharArrayReader(buf);
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}
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/**
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* Retrieves the <code>CLOB</code> value designated by this <code>SerialClob</code>
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* object as an ascii stream. This method forwards the <code>getAsciiStream</code>
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* call to the underlying <code>Clob</code> object in the event that this
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* <code>SerialClob</code> object is instantiated with a <code>Clob</code>
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* object. If this <code>SerialClob</code> object is instantiated with
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* a <code>char</code> array, a <code>SerialException</code> object is thrown.
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*
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* @return a <code>java.io.InputStream</code> object containing
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* this <code>SerialClob</code> object's data
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* @throws SerialException if this <code>SerialClob</code> object was not instantiated
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* with a <code>Clob</code> object
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* @throws SQLException if there is an error accessing the
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* <code>CLOB</code> value represented by the <code>Clob</code> object that was
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* used to create this <code>SerialClob</code> object
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*/
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public java.io.InputStream getAsciiStream() throws SerialException, SQLException {
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if (this.clob != null) {
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return this.clob.getAsciiStream();
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} else {
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throw new SerialException("Unsupported operation. SerialClob cannot " +
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"return a the CLOB value as an ascii stream, unless instantiated " +
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"with a fully implemented Clob object.");
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}
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}
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/**
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* Returns a copy of the substring contained in this
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* <code>SerialClob</code> object, starting at the given position
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* and continuing for the specified number or characters.
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*
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* @param pos the position of the first character in the substring
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* to be copied; the first character of the
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* <code>SerialClob</code> object is at position
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* <code>1</code>; must not be less than <code>1</code>,
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* and the sum of the starting position and the length
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* of the substring must be less than the length of this
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* <code>SerialClob</code> object
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* @param length the number of characters in the substring to be
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* returned; must not be greater than the length of
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* this <code>SerialClob</code> object, and the
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* sum of the starting position and the length
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* of the substring must be less than the length of this
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* <code>SerialClob</code> object
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* @return a <code>String</code> object containing a substring of
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* this <code>SerialClob</code> object beginning at the
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* given position and containing the specified number of
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* consecutive characters
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* @throws SerialException if either of the arguments is out of bounds
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*/
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public String getSubString(long pos, int length) throws SerialException {
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if (pos < 1 || pos > this.length()) {
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throw new SerialException("Invalid position in BLOB object set");
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}
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if ((pos-1) + length > this.length()) {
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throw new SerialException("Invalid position and substring length");
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}
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try {
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return new String(buf, (int)pos - 1, length);
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} catch (StringIndexOutOfBoundsException e) {
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throw new SerialException("StringIndexOutOfBoundsException: " +
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e.getMessage());
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}
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}
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/**
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* Returns the position in this <code>SerialClob</code> object
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* where the given <code>String</code> object begins, starting
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* the search at the specified position. This method returns
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* <code>-1</code> if the pattern is not found.
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*
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* @param searchStr the <code>String</code> object for which to
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* search
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* @param start the position in this <code>SerialClob</code> object
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* at which to start the search; the first position is
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* <code>1</code>; must not be less than <code>1</code> nor
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* greater than the length of this <code>SerialClob</code> object
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* @return the position at which the given <code>String</code> object
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* begins, starting the search at the specified position;
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* <code>-1</code> if the given <code>String</code> object is
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* not found or the starting position is out of bounds; position
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* numbering for the return value starts at <code>1</code>
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* @throws SerialException if an error occurs locating the String signature
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* @throws SQLException if there is an error accessing the Blob value
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* from the database.
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*/
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public long position(String searchStr, long start)
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throws SerialException, SQLException {
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if (start < 1 || start > len) {
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return -1;
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}
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char pattern[] = searchStr.toCharArray();
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int pos = (int)start-1;
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int i = 0;
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long patlen = pattern.length;
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while (pos < len) {
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if (pattern[i] == buf[pos]) {
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if (i + 1 == patlen) {
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return (pos + 1) - (patlen - 1);
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}
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i++; pos++; // increment pos, and i
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} else if (pattern[i] != buf[pos]) {
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pos++; // increment pos only
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}
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}
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return -1; // not found
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}
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/**
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* Returns the position in this <code>SerialClob</code> object
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* where the given <code>Clob</code> signature begins, starting
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* the search at the specified position. This method returns
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* <code>-1</code> if the pattern is not found.
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*
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* @param searchStr the <code>Clob</code> object for which to search
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* @param start the position in this <code>SerialClob</code> object
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* at which to begin the search; the first position is
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* <code>1</code>; must not be less than <code>1</code> nor
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* greater than the length of this <code>SerialClob</code> object
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* @return the position at which the given <code>Clob</code>
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* object begins in this <code>SerialClob</code> object,
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* at or after the specified starting position
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* @throws SerialException if an error occurs locating the Clob signature
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* @throws SQLException if there is an error accessing the Blob value
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* from the database
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*/
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public long position(Clob searchStr, long start)
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throws SerialException, SQLException {
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return position(searchStr.getSubString(1,(int)searchStr.length()), start);
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}
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/**
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336 |
* Writes the given Java <code>String</code> to the <code>CLOB</code>
|
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337 |
* value that this <code>SerialClob</code> object represents, at the position
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338 |
* <code>pos</code>.
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339 |
*
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340 |
* @param pos the position at which to start writing to the <code>CLOB</code>
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341 |
* value that this <code>SerialClob</code> object represents; the first
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342 |
* position is <code>1</code>; must not be less than <code>1</code> nor
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343 |
* greater than the length of this <code>SerialClob</code> object
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* @param str the string to be written to the <code>CLOB</code>
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345 |
* value that this <code>SerialClob</code> object represents
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* @return the number of characters written
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347 |
* @throws SerialException if there is an error accessing the
|
|
348 |
* <code>CLOB</code> value; if an invalid position is set; if an
|
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349 |
* invalid offset value is set; if number of bytes to be written
|
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350 |
* is greater than the <code>SerialClob</code> length; or the combined
|
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351 |
* values of the length and offset is greater than the Clob buffer
|
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352 |
*/
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353 |
public int setString(long pos, String str) throws SerialException {
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354 |
return (setString(pos, str, 0, str.length()));
|
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355 |
}
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356 |
|
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357 |
/**
|
|
358 |
* Writes <code>len</code> characters of <code>str</code>, starting
|
|
359 |
* at character <code>offset</code>, to the <code>CLOB</code> value
|
|
360 |
* that this <code>Clob</code> represents.
|
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361 |
*
|
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362 |
* @param pos the position at which to start writing to the <code>CLOB</code>
|
|
363 |
* value that this <code>SerialClob</code> object represents; the first
|
|
364 |
* position is <code>1</code>; must not be less than <code>1</code> nor
|
|
365 |
* greater than the length of this <code>SerialClob</code> object
|
|
366 |
* @param str the string to be written to the <code>CLOB</code>
|
|
367 |
* value that this <code>Clob</code> object represents
|
|
368 |
* @param offset the offset into <code>str</code> to start reading
|
|
369 |
* the characters to be written
|
|
370 |
* @param length the number of characters to be written
|
|
371 |
* @return the number of characters written
|
|
372 |
* @throws SerialException if there is an error accessing the
|
|
373 |
* <code>CLOB</code> value; if an invalid position is set; if an
|
|
374 |
* invalid offset value is set; if number of bytes to be written
|
|
375 |
* is greater than the <code>SerialClob</code> length; or the combined
|
|
376 |
* values of the length and offset is greater than the Clob buffer
|
|
377 |
*/
|
|
378 |
public int setString(long pos, String str, int offset, int length)
|
|
379 |
throws SerialException {
|
|
380 |
String temp = str.substring(offset);
|
|
381 |
char cPattern[] = temp.toCharArray();
|
|
382 |
|
|
383 |
if (offset < 0 || offset > str.length()) {
|
|
384 |
throw new SerialException("Invalid offset in byte array set");
|
|
385 |
}
|
|
386 |
|
|
387 |
if (pos < 1 || pos > this.length()) {
|
|
388 |
throw new SerialException("Invalid position in BLOB object set");
|
|
389 |
}
|
|
390 |
|
|
391 |
if ((long)(length) > origLen) {
|
|
392 |
throw new SerialException("Buffer is not sufficient to hold the value");
|
|
393 |
}
|
|
394 |
|
|
395 |
if ((length + offset) > str.length()) {
|
|
396 |
// need check to ensure length + offset !> bytes.length
|
|
397 |
throw new SerialException("Invalid OffSet. Cannot have combined offset " +
|
|
398 |
" and length that is greater that the Blob buffer");
|
|
399 |
}
|
|
400 |
|
|
401 |
int i = 0;
|
|
402 |
pos--; //values in the array are at position one less
|
|
403 |
while ( i < length || (offset + i +1) < (str.length() - offset ) ) {
|
|
404 |
this.buf[(int)pos + i ] = cPattern[offset + i ];
|
|
405 |
i++;
|
|
406 |
}
|
|
407 |
return i;
|
|
408 |
}
|
|
409 |
|
|
410 |
/**
|
|
411 |
* Retrieves a stream to be used to write Ascii characters to the
|
|
412 |
* <code>CLOB</code> value that this <code>SerialClob</code> object represents,
|
|
413 |
* starting at position <code>pos</code>. This method forwards the
|
|
414 |
* <code>setAsciiStream()</code> call to the underlying <code>Clob</code> object in
|
|
415 |
* the event that this <code>SerialClob</code> object is instantiated with a
|
|
416 |
* <code>Clob</code> object. If this <code>SerialClob</code> object is instantiated
|
|
417 |
* with a <code>char</code> array, a <code>SerialException</code> object is thrown.
|
|
418 |
*
|
|
419 |
* @param pos the position at which to start writing to the
|
|
420 |
* <code>CLOB</code> object
|
|
421 |
* @return the stream to which ASCII encoded characters can be written
|
|
422 |
* @throws SerialException if SerialClob is not instantiated with a
|
|
423 |
* Clob object that supports <code>setAsciiStream</code>
|
|
424 |
* @throws SQLException if there is an error accessing the
|
|
425 |
* <code>CLOB</code> value
|
|
426 |
* @see #getAsciiStream
|
|
427 |
*/
|
|
428 |
public java.io.OutputStream setAsciiStream(long pos)
|
|
429 |
throws SerialException, SQLException {
|
|
430 |
if (this.clob.setAsciiStream(pos) != null) {
|
|
431 |
return this.clob.setAsciiStream(pos);
|
|
432 |
} else {
|
|
433 |
throw new SerialException("Unsupported operation. SerialClob cannot " +
|
|
434 |
"return a writable ascii stream\n unless instantiated with a Clob object " +
|
|
435 |
"that has a setAsciiStream() implementation");
|
|
436 |
}
|
|
437 |
}
|
|
438 |
|
|
439 |
/**
|
|
440 |
* Retrieves a stream to be used to write a stream of Unicode characters
|
|
441 |
* to the <code>CLOB</code> value that this <code>SerialClob</code> object
|
|
442 |
* represents, at position <code>pos</code>. This method forwards the
|
|
443 |
* <code>setCharacterStream()</code> call to the underlying <code>Clob</code>
|
|
444 |
* object in the event that this <code>SerialClob</code> object is instantiated with a
|
|
445 |
* <code>Clob</code> object. If this <code>SerialClob</code> object is instantiated with
|
|
446 |
* a <code>char</code> array, a <code>SerialException</code> is thrown.
|
|
447 |
*
|
|
448 |
* @param pos the position at which to start writing to the
|
|
449 |
* <code>CLOB</code> value
|
|
450 |
*
|
|
451 |
* @return a stream to which Unicode encoded characters can be written
|
|
452 |
* @throws SerialException if the SerialClob is not instantiated with
|
|
453 |
* a Clob object that supports <code>setCharacterStream</code>
|
|
454 |
* @throws SQLException if there is an error accessing the
|
|
455 |
* <code>CLOB</code> value
|
|
456 |
* @see #getCharacterStream
|
|
457 |
*/
|
|
458 |
public java.io.Writer setCharacterStream(long pos)
|
|
459 |
throws SerialException, SQLException {
|
|
460 |
if (this.clob.setCharacterStream(pos) != null) {
|
|
461 |
return this.clob.setCharacterStream(pos);
|
|
462 |
} else {
|
|
463 |
throw new SerialException("Unsupported operation. SerialClob cannot " +
|
|
464 |
"return a writable character stream\n unless instantiated with a Clob object " +
|
|
465 |
"that has a setCharacterStream implementation");
|
|
466 |
}
|
|
467 |
}
|
|
468 |
|
|
469 |
/**
|
|
470 |
* Truncates the <code>CLOB</code> value that this <code>SerialClob</code>
|
|
471 |
* object represents so that it has a length of <code>len</code>
|
|
472 |
* characters.
|
|
473 |
* <p>
|
|
474 |
* Truncating a <code>SerialClob</code> object to length 0 has the effect of
|
|
475 |
* clearing its contents.
|
|
476 |
*
|
|
477 |
* @param length the length, in bytes, to which the <code>CLOB</code>
|
|
478 |
* value should be truncated
|
|
479 |
* @throws SQLException if there is an error accessing the
|
|
480 |
* <code>CLOB</code> value
|
|
481 |
*/
|
|
482 |
public void truncate(long length) throws SerialException {
|
|
483 |
if (length > len) {
|
|
484 |
throw new SerialException
|
|
485 |
("Length more than what can be truncated");
|
|
486 |
} else {
|
|
487 |
len = length;
|
|
488 |
// re-size the buffer
|
|
489 |
|
|
490 |
if (len == 0) {
|
|
491 |
buf = new char[] {};
|
|
492 |
} else {
|
|
493 |
buf = (this.getSubString(1, (int)len)).toCharArray();
|
|
494 |
}
|
|
495 |
|
|
496 |
}
|
|
497 |
}
|
|
498 |
|
|
499 |
|
|
500 |
public Reader getCharacterStream(long pos, long length) throws SQLException {
|
|
501 |
throw new java.lang.UnsupportedOperationException("Not supported");
|
|
502 |
}
|
|
503 |
|
|
504 |
public void free() throws SQLException {
|
|
505 |
throw new java.lang.UnsupportedOperationException("Not supported");
|
|
506 |
}
|
|
507 |
|
|
508 |
/**
|
|
509 |
* The identifier that assists in the serialization of this <code>SerialClob</code>
|
|
510 |
* object.
|
|
511 |
*/
|
|
512 |
static final long serialVersionUID = -1662519690087375313L;
|
|
513 |
}
|