public interface Wrapper
The wrapper pattern is employed by many JDBC driver implementations to provide extensions beyond the traditional JDBC API that are specific to a data source. Developers may wish to gain access to these resources that are wrapped (the delegates) as proxy class instances representing the the actual resources. This interface describes a standard mechanism to access these wrapped resources represented by their proxy, to permit direct access to the resource delegates.
|Modifier and Type||Method and Description|
Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.
Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.
<T> T unwrap(Class<T> iface) throws SQLException
unwraprecursively 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
iface- A Class defining an interface that the result must implement.
SQLException- If no object found that implements the interface
boolean isWrapperFor(Class<?> iface) throws SQLException
isWrapperForon 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
unwrapso that callers can use this method to avoid expensive
unwrapcalls that may fail. If this method returns true then calling
unwrapwith the same argument should succeed.
iface- a Class defining an interface.
SQLException- if an error occurs while determining whether this is a wrapper for an object with the given interface.
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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