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package com.sun.gjc.spi.jdbc40;
import java.sql.SQLException;
import javax.resource.spi.ConnectionManager;
import javax.resource.ResourceException;
import com.sun.gjc.spi.base.DataSource;
import com.sun.gjc.spi.ManagedConnectionFactory;
import com.sun.enterprise.util.i18n.StringManager;
import java.util.logging.Level;
/**
* Holds the <code>java.sql.Connection</code> object, which is to be
* passed to the application program.
*
* @author Binod P.G
* @version 1.0, 02/07/31
*/
public class DataSource40 extends DataSource {
protected final static StringManager localStrings =
StringManager.getManager(ManagedConnectionFactory.class);
/**
* Constructs <code>DataSource</code> object. This is created by the
* <code>ManagedConnectionFactory</code> object.
*
* @param mcf <code>ManagedConnectionFactory</code> object
* creating this object.
* @param cm <code>ConnectionManager</code> object either associated
* with Application server or Resource Adapter.
*/
public DataSource40(ManagedConnectionFactory mcf, ConnectionManager cm) {
super(mcf, cm);
}
/**
* Returns an object that implements the given interface to allow access to
* non-standard methods, or standard methods not exposed by the proxy.
*
* If the receiver implements the interface then the result is the receiver
* or a proxy for the receiver. If the receiver is a wrapper
* and the wrapped object implements the interface then the result is the
* wrapped object or a proxy for the wrapped object. Otherwise return the
* the result of calling <code>unwrap</code> recursively on the wrapped object
* or a proxy for that result. If the receiver is not a
* wrapper and does not implement the interface, then an <code>SQLException</code> is thrown.
*
* @param iface A Class defining an interface that the result must implement.
* @return an object that implements the interface. May be a proxy for the actual implementing object.
* @throws java.sql.SQLException If no object found that implements the interface
* @since 1.6
*/
public <T> T unwrap(Class<T> iface) throws SQLException {
T result ;
try {
Object cds = mcf.getDataSource();
if(iface.isInstance(cds)){
result = iface.cast(cds);
}else if (cds instanceof java.sql.Wrapper) {
result = ((java.sql.Wrapper) cds).unwrap(iface);
} else {
String msg = localStrings.getString("jdbc.feature_not_supported");
throw new SQLException(msg);
}
} catch (ResourceException e) {
_logger.log(Level.WARNING, "jdbc.exc_unwrap", e);
throw new SQLException(e);
}
return result;
}
/**
* Returns true if this either implements the interface argument or is directly or indirectly a wrapper
* for an object that does. Returns false otherwise. If this implements the interface then return true,
* else if this is a wrapper then return the result of recursively calling <code>isWrapperFor</code> on the wrapped
* object. If this does not implement the interface and is not a wrapper, return false.
* This method should be implemented as a low-cost operation compared to <code>unwrap</code> so that
* callers can use this method to avoid expensive <code>unwrap</code> calls that may fail. If this method
* returns true then calling <code>unwrap</code> with the same argument should succeed.
*
* @param iface a Class defining an interface.
* @return true if this implements the interface or directly or indirectly wraps an object that does.
* @throws java.sql.SQLException if an error occurs while determining whether this is a wrapper
* for an object with the given interface.
* @since 1.6
*/
public boolean isWrapperFor(Class<?> iface) throws SQLException {
boolean result = false;
try {
Object cds = mcf.getDataSource();
if(iface.isInstance(cds)){
result = true;
}else if (cds instanceof java.sql.Wrapper) {
result = ((java.sql.Wrapper) cds).isWrapperFor(iface);
}
} catch (ResourceException e) {
_logger.log(Level.WARNING, "jdbc.exc_is_wrapper", e);
throw new SQLException(e);
}
return result ;
}
}
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