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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.rowset.providers;
import com.sun.rowset.JdbcRowSetResourceBundle;
import java.io.IOException;
import java.sql.*;
import javax.sql.*;
import javax.sql.rowset.spi.*;
/**
* A reference implementation of a JDBC RowSet synchronization provider
* with the ability to read and write rowsets in well formed XML using the
* standard WebRowSet schema.
*
* <h3>1.0 Background</h3>
* This synchronization provider is registered with the
* <code>SyncFactory</code> by default as the
* <code>com.sun.rowset.providers.RIXMLProvider</code>.
* <P>
* A <code>WebRowSet</code> object uses an <code>RIXMLProvider</code> implementation
* to read an XML data source or to write itself in XML format using the
* <code>WebRowSet</code> XML schema definition available at
* <pre>
* <a href="http://java.sun.com/xml/ns/jdbc/webrowset.xsd">http://java.sun.com/xml/ns/jdbc/webrowset.xsd</a>
* </pre>
* The <code>RIXMLProvider</code> implementation has a synchronization level of
* GRADE_NONE, which means that it does no checking at all for conflicts. It
* simply writes a <code>WebRowSet</code> object to a file.
* <h3>2.0 Usage</h3>
* A <code>WebRowSet</code> implementation is created with an <code>RIXMLProvider</code>
* by default.
* <pre>
* WebRowSet wrs = new FooWebRowSetImpl();
* </pre>
* The <code>SyncFactory</code> always provides an instance of
* <code>RIOptimisticProvider</code> when no provider is specified,
* but the implementation of the default constructor for <code>WebRowSet</code> sets the
* provider to be the <code>RIXMLProvider</code> implementation. Therefore,
* the following line of code is executed behind the scenes as part of the
* implementation of the default constructor.
* <pre>
* wrs.setSyncProvider("com.sun.rowset.providers.RIXMLProvider");
* </pre>
* See the standard <code>RowSet</code> reference implementations in the
* <code>com.sun.rowset</code> package for more details.
*
* @author Jonathan Bruce
* @see javax.sql.rowset.spi.SyncProvider
* @see javax.sql.rowset.spi.SyncProviderException
* @see javax.sql.rowset.spi.SyncFactory
* @see javax.sql.rowset.spi.SyncFactoryException
*/
public final class RIXMLProvider extends SyncProvider {
/**
* The unique provider identifier.
*/
private String providerID = "com.sun.rowset.providers.RIXMLProvider";
/**
* The vendor name of this SyncProvider implementation.
*/
private String vendorName = "Oracle Corporation";
/**
* The version number of this SyncProvider implementation.
*/
private String versionNumber = "1.0";
private JdbcRowSetResourceBundle resBundle;
private XmlReader xmlReader;
private XmlWriter xmlWriter;
/**
* This provider is available to all JDBC <code>RowSet</code> implementations as the
* default persistence provider.
*/
public RIXMLProvider() {
providerID = this.getClass().getName();
try {
resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle();
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
/**
* Returns <code>"javax.sql.rowset.providers.RIXMLProvider"</code>, which is
* the fully qualified class name of this provider implementation.
*
* @return a <code>String</code> object with the fully specified class name of
* this <code>RIOptimisticProvider</code> implementation
*/
public String getProviderID() {
return providerID;
}
// additional methods that sit on top of reader/writer methods back to
// original datasource. Allow XML state to be written out and in
/**
* Sets this <code>WebRowSet</code> object's reader to the given
* <code>XmlReader</code> object.
*
* @throws SQLException if a database access error occurs
*/
public void setXmlReader(XmlReader reader) throws SQLException {
xmlReader = reader;
}
/**
* Sets this <code>WebRowSet</code> object's writer to the given
* <code>XmlWriter</code> object.
*
* @throws SQLException if a database access error occurs
*/
public void setXmlWriter(XmlWriter writer) throws SQLException {
xmlWriter = writer;
}
/**
* Retrieves the reader that this <code>WebRowSet</code> object
* will call when its <code>readXml</code> method is called.
*
* @return the <code>XmlReader</code> object for this SyncProvider
* @throws SQLException if a database access error occurs
*/
public XmlReader getXmlReader() throws SQLException {
return xmlReader;
}
/**
* Retrieves the writer that this <code>WebRowSet</code> object
* will call when its <code>writeXml</code> method is called.
*
* @return the <code>XmlWriter</code> for this SyncProvider
* @throws SQLException if a database access error occurs
*/
public XmlWriter getXmlWriter() throws SQLException {
return xmlWriter;
}
/**
* Returns the <code>SyncProvider</code> grade of syncrhonization that
* <code>RowSet</code> object instances can expect when using this
* implementation. As this implementation provides no synchonization
* facilities to the XML data source, the lowest grade is returned.
*
* @return the <code>SyncProvider</code> syncronization grade of this
* provider; must be one of the following constants:
* <PRE>
* SyncProvider.GRADE_NONE,
* SyncProvider.GRADE_MODIFIED_AT_COMMIT,
* SyncProvider.GRADE_CHECK_ALL_AT_COMMIT,
* SyncProvider.GRADE_LOCK_WHEN_MODIFIED,
* SyncProvider.GRADE_LOCK_WHEN_LOADED
* </PRE>
*
*/
public int getProviderGrade() {
return SyncProvider.GRADE_NONE;
}
/**
* Returns the default UPDATABLE_VIEW behavior of this reader
*
*/
public int supportsUpdatableView() {
return SyncProvider.NONUPDATABLE_VIEW_SYNC;
}
/**
* Returns the default DATASOURCE_LOCK behavior of this reader
*/
public int getDataSourceLock() throws SyncProviderException {
return SyncProvider.DATASOURCE_NO_LOCK;
}
/**
* Throws an unsupported operation exception as this method does
* function with non-locking XML data sources.
*/
public void setDataSourceLock(int lock) throws SyncProviderException {
throw new UnsupportedOperationException(resBundle.handleGetObject("rixml.unsupp").toString());
}
/**
* Returns a null object as RowSetWriters are not returned by this SyncProvider
*/
public RowSetWriter getRowSetWriter() {
return null;
}
/**
* Returns a null object as RowSetWriter objects are not returned by this
* SyncProvider
*/
public RowSetReader getRowSetReader() {
return null;
}
/**
* Returns the release version ID of the Reference Implementation Optimistic
* Synchronization Provider.
*
* @return the <code>String</code> detailing the version number of this SyncProvider
*/
public String getVersion() {
return this.versionNumber;
}
/**
* Returns the vendor name of the Reference Implemntation Optimistic
* Syncchronication Provider
*
* @return the <code>String</code> detailing the vendor name of this
* SyncProvider
*/
public String getVendor() {
return this.vendorName;
}
}