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695 lines
27 KiB
695 lines
27 KiB
/*
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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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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import java.util.Arrays;
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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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* <h3> Thread safety </h3>
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*
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* <p> A SerialClob is not safe for use by multiple concurrent threads. If a
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* SerialClob is to be used by more than one thread then access to the SerialClob
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* should be controlled by appropriate synchronization.
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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 initialized with a
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* Clob. Null if SerialClob is initialized with a char[].
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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 this <code>SerialClob</code>
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* object's 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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clob = null;
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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 must
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* return non-null for both 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 either of the
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* <code>Clob.getCharacterStream()</code> and <code>Clob.getAsciiStream()</code>
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* methods on the <code>Clob</code> returns 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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try (Reader charStream = clob.getCharacterStream()) {
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if (charStream == null) {
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throw new SQLException("Invalid Clob object. The call to getCharacterStream " +
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"returned null which cannot be serialized.");
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}
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// Note: get an ASCII stream in order to null-check it,
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// even though we don't do anything with it.
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try (InputStream asciiStream = clob.getAsciiStream()) {
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if (asciiStream == null) {
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throw new SQLException("Invalid Clob object. The call to getAsciiStream " +
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"returned null which cannot be serialized.");
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}
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}
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try (Reader reader = new BufferedReader(charStream)) {
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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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}
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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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* if {@code free} had previously been called on this object
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*/
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public long length() throws SerialException {
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isValid();
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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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* if {@code free} had previously been called on this object
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*/
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public java.io.Reader getCharacterStream() throws SerialException {
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isValid();
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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} object was not
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* instantiated with a <code>Clob</code> object;
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* if {@code free} had previously been called on this 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
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* that was 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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isValid();
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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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* if {@code free} had previously been called on this object
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*/
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public String getSubString(long pos, int length) throws SerialException {
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isValid();
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if (pos < 1 || pos > this.length()) {
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throw new SerialException("Invalid position in SerialClob 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 the {@code free} method had been
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* previously called on this object
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* @throws SQLException if there is an error accessing the Clob 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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isValid();
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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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* if the {@code free} method had been previously called on this object
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* @throws SQLException if there is an error accessing the Clob 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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isValid();
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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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* Writes the given Java <code>String</code> to the <code>CLOB</code>
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* value that this <code>SerialClob</code> object represents, at the position
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* <code>pos</code>.
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*
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* @param pos the position at which to start writing to the <code>CLOB</code>
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* value that this <code>SerialClob</code> object represents; the first
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* position is <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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* @param str the string to be written to the <code>CLOB</code>
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* value that this <code>SerialClob</code> object represents
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* @return the number of characters written
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* @throws SerialException if there is an error accessing the
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* <code>CLOB</code> value; if an invalid position is set; if an
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* invalid offset value is set; if number of bytes to be written
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* is greater than the <code>SerialClob</code> length; or the combined
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* values of the length and offset is greater than the Clob buffer;
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* if the {@code free} method had been previously called on this object
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*/
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public int setString(long pos, String str) throws SerialException {
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return (setString(pos, str, 0, str.length()));
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}
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/**
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* Writes <code>len</code> characters of <code>str</code>, starting
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* at character <code>offset</code>, to the <code>CLOB</code> value
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* that this <code>Clob</code> represents.
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*
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* @param pos the position at which to start writing to the <code>CLOB</code>
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* value that this <code>SerialClob</code> object represents; the first
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* position is <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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* @param str the string to be written to the <code>CLOB</code>
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* value that this <code>Clob</code> object represents
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* @param offset the offset into <code>str</code> to start reading
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* the characters to be written
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* @param length the number of characters to be written
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* @return the number of characters written
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* @throws SerialException if there is an error accessing the
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* <code>CLOB</code> value; if an invalid position is set; if an
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* invalid offset value is set; if number of bytes to be written
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* is greater than the <code>SerialClob</code> length; or the combined
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* values of the length and offset is greater than the Clob buffer;
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* if the {@code free} method had been previously called on this object
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*/
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public int setString(long pos, String str, int offset, int length)
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throws SerialException {
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isValid();
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String temp = str.substring(offset);
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char cPattern[] = temp.toCharArray();
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if (offset < 0 || offset > str.length()) {
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throw new SerialException("Invalid offset in byte array set");
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}
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if (pos < 1 || pos > this.length()) {
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throw new SerialException("Invalid position in Clob object set");
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}
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if ((long)(length) > origLen) {
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throw new SerialException("Buffer is not sufficient to hold the value");
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}
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if ((length + offset) > str.length()) {
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// need check to ensure length + offset !> bytes.length
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throw new SerialException("Invalid OffSet. Cannot have combined offset " +
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" and length that is greater that the Blob buffer");
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}
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int i = 0;
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pos--; //values in the array are at position one less
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while ( i < length || (offset + i +1) < (str.length() - offset ) ) {
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this.buf[(int)pos + i ] = cPattern[offset + i ];
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i++;
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}
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return i;
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}
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/**
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* Retrieves a stream to be used to write Ascii characters to the
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* <code>CLOB</code> value that this <code>SerialClob</code> object represents,
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* starting at position <code>pos</code>. This method forwards the
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* <code>setAsciiStream()</code> call to the underlying <code>Clob</code> object in
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* the event that this <code>SerialClob</code> object is instantiated with a
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* <code>Clob</code> object. If this <code>SerialClob</code> object is instantiated
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* with a <code>char</code> array, a <code>SerialException</code> object is thrown.
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*
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* @param pos the position at which to start writing to the
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* <code>CLOB</code> object
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* @return the stream to which ASCII encoded characters can be written
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* @throws SerialException if SerialClob is not instantiated with a
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* Clob object;
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* if the {@code free} method had been previously called on this object
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* @throws SQLException if there is an error accessing the
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* <code>CLOB</code> value
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* @see #getAsciiStream
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*/
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public java.io.OutputStream setAsciiStream(long pos)
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throws SerialException, SQLException {
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isValid();
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if (this.clob != null) {
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return this.clob.setAsciiStream(pos);
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} else {
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throw new SerialException("Unsupported operation. SerialClob cannot " +
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"return a writable ascii stream\n unless instantiated with a Clob object " +
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"that has a setAsciiStream() implementation");
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}
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}
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/**
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* Retrieves a stream to be used to write a stream of Unicode characters
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* to the <code>CLOB</code> value that this <code>SerialClob</code> object
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* represents, at position <code>pos</code>. This method forwards the
|
|
* <code>setCharacterStream()</code> call to the underlying <code>Clob</code>
|
|
* object in the event that this <code>SerialClob</code> object is instantiated with a
|
|
* <code>Clob</code> object. If this <code>SerialClob</code> object is instantiated with
|
|
* a <code>char</code> array, a <code>SerialException</code> is thrown.
|
|
*
|
|
* @param pos the position at which to start writing to the
|
|
* <code>CLOB</code> value
|
|
*
|
|
* @return a stream to which Unicode encoded characters can be written
|
|
* @throws SerialException if the SerialClob is not instantiated with
|
|
* a Clob object;
|
|
* if the {@code free} method had been previously called on this object
|
|
* @throws SQLException if there is an error accessing the
|
|
* <code>CLOB</code> value
|
|
* @see #getCharacterStream
|
|
*/
|
|
public java.io.Writer setCharacterStream(long pos)
|
|
throws SerialException, SQLException {
|
|
isValid();
|
|
if (this.clob != null) {
|
|
return this.clob.setCharacterStream(pos);
|
|
} else {
|
|
throw new SerialException("Unsupported operation. SerialClob cannot " +
|
|
"return a writable character stream\n unless instantiated with a Clob object " +
|
|
"that has a setCharacterStream implementation");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Truncates the <code>CLOB</code> value that this <code>SerialClob</code>
|
|
* object represents so that it has a length of <code>len</code>
|
|
* characters.
|
|
* <p>
|
|
* Truncating a <code>SerialClob</code> object to length 0 has the effect of
|
|
* clearing its contents.
|
|
*
|
|
* @param length the length, in bytes, to which the <code>CLOB</code>
|
|
* value should be truncated
|
|
* @throws SerialException if there is an error accessing the
|
|
* <code>CLOB</code> value;
|
|
* if the {@code free} method had been previously called on this object
|
|
*/
|
|
public void truncate(long length) throws SerialException {
|
|
isValid();
|
|
if (length > len) {
|
|
throw new SerialException
|
|
("Length more than what can be truncated");
|
|
} else {
|
|
len = length;
|
|
// re-size the buffer
|
|
|
|
if (len == 0) {
|
|
buf = new char[] {};
|
|
} else {
|
|
buf = (this.getSubString(1, (int)len)).toCharArray();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a {@code Reader} object that contains a partial
|
|
* {@code SerialClob} value, starting
|
|
* with the character specified by pos, which is length characters in length.
|
|
*
|
|
* @param pos the offset to the first character of the partial value to
|
|
* be retrieved. The first character in the {@code SerialClob} is at position 1.
|
|
* @param length the length in characters of the partial value to be retrieved.
|
|
* @return {@code Reader} through which the partial {@code SerialClob}
|
|
* value can be read.
|
|
* @throws SQLException if pos is less than 1 or if pos is greater than the
|
|
* number of characters in the {@code SerialClob} or if pos + length
|
|
* is greater than the number of characters in the {@code SerialClob};
|
|
* @throws SerialException if the {@code free} method had been previously
|
|
* called on this object
|
|
* @since 1.6
|
|
*/
|
|
public Reader getCharacterStream(long pos, long length) throws SQLException {
|
|
isValid();
|
|
if (pos < 1 || pos > len) {
|
|
throw new SerialException("Invalid position in Clob object set");
|
|
}
|
|
|
|
if ((pos-1) + length > len) {
|
|
throw new SerialException("Invalid position and substring length");
|
|
}
|
|
if (length <= 0) {
|
|
throw new SerialException("Invalid length specified");
|
|
}
|
|
return new CharArrayReader(buf, (int)pos, (int)length);
|
|
}
|
|
|
|
/**
|
|
* This method frees the {@code SeriableClob} object and releases the
|
|
* resources that it holds.
|
|
* The object is invalid once the {@code free} method is called.
|
|
* <p>
|
|
* If {@code free} is called multiple times, the subsequent
|
|
* calls to {@code free} are treated as a no-op.
|
|
* </P>
|
|
* @throws SQLException if an error occurs releasing
|
|
* the Clob's resources
|
|
* @since 1.6
|
|
*/
|
|
public void free() throws SQLException {
|
|
if (buf != null) {
|
|
buf = null;
|
|
if (clob != null) {
|
|
clob.free();
|
|
}
|
|
clob = null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Compares this SerialClob to the specified object. The result is {@code
|
|
* true} if and only if the argument is not {@code null} and is a {@code
|
|
* SerialClob} object that represents the same sequence of characters as this
|
|
* object.
|
|
*
|
|
* @param obj The object to compare this {@code SerialClob} against
|
|
*
|
|
* @return {@code true} if the given object represents a {@code SerialClob}
|
|
* equivalent to this SerialClob, {@code false} otherwise
|
|
*
|
|
*/
|
|
public boolean equals(Object obj) {
|
|
if (this == obj) {
|
|
return true;
|
|
}
|
|
if (obj instanceof SerialClob) {
|
|
SerialClob sc = (SerialClob)obj;
|
|
if (this.len == sc.len) {
|
|
return Arrays.equals(buf, sc.buf);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns a hash code for this {@code SerialClob}.
|
|
* @return a hash code value for this object.
|
|
*/
|
|
public int hashCode() {
|
|
return ((31 + Arrays.hashCode(buf)) * 31 + (int)len) * 31 + (int)origLen;
|
|
}
|
|
|
|
/**
|
|
* Returns a clone of this {@code SerialClob}. The copy will contain a
|
|
* reference to a clone of the internal character array, not a reference
|
|
* to the original internal character array of this {@code SerialClob} object.
|
|
* The underlying {@code Clob} object will be set to null.
|
|
*
|
|
* @return a clone of this SerialClob
|
|
*/
|
|
public Object clone() {
|
|
try {
|
|
SerialClob sc = (SerialClob) super.clone();
|
|
sc.buf = (buf != null) ? Arrays.copyOf(buf, (int)len) : null;
|
|
sc.clob = null;
|
|
return sc;
|
|
} catch (CloneNotSupportedException ex) {
|
|
// this shouldn't happen, since we are Cloneable
|
|
throw new InternalError();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* readObject is called to restore the state of the SerialClob from
|
|
* a stream.
|
|
*/
|
|
private void readObject(ObjectInputStream s)
|
|
throws IOException, ClassNotFoundException {
|
|
|
|
ObjectInputStream.GetField fields = s.readFields();
|
|
char[] tmp = (char[])fields.get("buf", null);
|
|
if (tmp == null)
|
|
throw new InvalidObjectException("buf is null and should not be!");
|
|
buf = tmp.clone();
|
|
len = fields.get("len", 0L);
|
|
if (buf.length != len)
|
|
throw new InvalidObjectException("buf is not the expected size");
|
|
origLen = fields.get("origLen", 0L);
|
|
clob = (Clob) fields.get("clob", null);
|
|
}
|
|
|
|
/**
|
|
* writeObject is called to save the state of the SerialClob
|
|
* to a stream.
|
|
*/
|
|
private void writeObject(ObjectOutputStream s)
|
|
throws IOException, ClassNotFoundException {
|
|
|
|
ObjectOutputStream.PutField fields = s.putFields();
|
|
fields.put("buf", buf);
|
|
fields.put("len", len);
|
|
fields.put("origLen", origLen);
|
|
// Note: this check to see if it is an instance of Serializable
|
|
// is for backwards compatibiity
|
|
fields.put("clob", clob instanceof Serializable ? clob : null);
|
|
s.writeFields();
|
|
}
|
|
|
|
/**
|
|
* Check to see if this object had previously had its {@code free} method
|
|
* called
|
|
*
|
|
* @throws SerialException
|
|
*/
|
|
private void isValid() throws SerialException {
|
|
if (buf == null) {
|
|
throw new SerialException("Error: You cannot call a method on a "
|
|
+ "SerialClob instance once free() has been called.");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The identifier that assists in the serialization of this {@code SerialClob}
|
|
* object.
|
|
*/
|
|
static final long serialVersionUID = -1662519690087375313L;
|
|
}
|