The ReferralException.java Java example source code
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package javax.naming;
import java.util.Hashtable;
/**
* This abstract class is used to represent a referral exception,
* which is generated in response to a <em>referral
* such as that returned by LDAP v3 servers.
* <p>
* A service provider provides
* a subclass of <tt>ReferralException by providing implementations
* for <tt>getReferralInfo() and getReferralContext() (and appropriate
* constructors and/or corresponding "set" methods).
* <p>
* The following code sample shows how <tt>ReferralException can be used.
* <blockquote>{@code
* while (true) {
* try {
* bindings = ctx.listBindings(name);
* while (bindings.hasMore()) {
* b = bindings.next();
* ...
* }
* break;
* } catch (ReferralException e) {
* ctx = e.getReferralContext();
* }
* }
* }</blockquote>
*<p>
* <tt>ReferralException is an abstract class. Concrete implementations
* determine its synchronization and serialization properties.
*<p>
* An environment parameter passed to the <tt>getReferralContext()
* method is owned by the caller.
* The service provider will not modify the object or keep a reference to it,
* but may keep a reference to a clone of it.
*
* @author Rosanna Lee
* @author Scott Seligman
*
* @since 1.3
*
*/
public abstract class ReferralException extends NamingException {
/**
* Constructs a new instance of ReferralException using the
* explanation supplied. All other fields are set to null.
*
* @param explanation Additional detail about this exception. Can be null.
* @see java.lang.Throwable#getMessage
*/
protected ReferralException(String explanation) {
super(explanation);
}
/**
* Constructs a new instance of ReferralException.
* All fields are set to null.
*/
protected ReferralException() {
super();
}
/**
* Retrieves information (such as URLs) related to this referral.
* The program may examine or display this information
* to the user to determine whether to continue with the referral,
* or to determine additional information needs to be supplied in order
* to continue with the referral.
*
* @return Non-null referral information related to this referral.
*/
public abstract Object getReferralInfo();
/**
* Retrieves the context at which to continue the method.
* Regardless of whether a referral is encountered directly during a
* context operation, or indirectly, for example, during a search
* enumeration, the referral exception should provide a context
* at which to continue the operation. The referral context is
* created using the environment properties of the context
* that threw the ReferralException.
*
*<p>
* To continue the operation, the client program should re-invoke
* the method using the same arguments as the original invocation.
*
* @return The non-null context at which to continue the method.
* @exception NamingException If a naming exception was encountered.
* Call either <tt>retryReferral() or skipReferral()
* to continue processing referrals.
*/
public abstract Context getReferralContext() throws NamingException;
/**
* Retrieves the context at which to continue the method using
* environment properties.
* Regardless of whether a referral is encountered directly during a
* context operation, or indirectly, for example, during a search
* enumeration, the referral exception should provide a context
* at which to continue the operation.
*<p>
* The referral context is created using <tt>env as its environment
* properties.
* This method should be used instead of the no-arg overloaded form
* when the caller needs to use different environment properties for
* the referral context. It might need to do this, for example, when
* it needs to supply different authentication information to the referred
* server in order to create the referral context.
*<p>
* To continue the operation, the client program should re-invoke
* the method using the same arguments as the original invocation.
*
* @param env The possibly null environment to use when retrieving the
* referral context. If null, no environment properties will be used.
*
* @return The non-null context at which to continue the method.
* @exception NamingException If a naming exception was encountered.
* Call either <tt>retryReferral() or skipReferral()
* to continue processing referrals.
*/
public abstract Context
getReferralContext(Hashtable<?,?> env)
throws NamingException;
/**
* Discards the referral about to be processed.
* A call to this method should be followed by a call to
* <code>getReferralContext to allow the processing of
* other referrals to continue.
* The following code fragment shows a typical usage pattern.
* <blockquote>
* } catch (ReferralException e) {
* if (!shallIFollow(e.getReferralInfo())) {
* if (!e.skipReferral()) {
* return;
* }
* }
* ctx = e.getReferralContext();
* }
* </pre>
*
* @return true If more referral processing is pending; false otherwise.
*/
public abstract boolean skipReferral();
/**
* Retries the referral currently being processed.
* A call to this method should be followed by a call to
* <code>getReferralContext to allow the current
* referral to be retried.
* The following code fragment shows a typical usage pattern.
* <blockquote>
* } catch (ReferralException e) {
* while (true) {
* try {
* ctx = e.getReferralContext(env);
* break;
* } catch (NamingException ne) {
* if (! shallIRetry()) {
* return;
* }
* // modify environment properties (env), if necessary
* e.retryReferral();
* }
* }
* }
* </pre>
*
*/
public abstract void retryReferral();
/**
* Use serialVersionUID from JNDI 1.1.1 for interoperability
*/
private static final long serialVersionUID = -2881363844695698876L;
}
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