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117 lines
3.7 KiB
117 lines
3.7 KiB
/*
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* Copyright (c) 1999, 2004, 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.naming;
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/**
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* This class represents a Reference whose contents is a name, called the link name,
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* that is bound to an atomic name in a context.
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*<p>
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* The name is a URL, or a name to be resolved relative to the initial
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* context, or if the first character of the name is ".", the name
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* is relative to the context in which the link is bound.
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*<p>
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* Normal resolution of names in context operations always follow links.
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* Resolution of the link name itself may cause resolution to pass through
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* other links. This gives rise to the possibility of a cycle of links whose
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* resolution could not terminate normally. As a simple means to avoid such
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* non-terminating resolutions, service providers may define limits on the
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* number of links that may be involved in any single operation invoked
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* by the caller.
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*<p>
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* A LinkRef contains a single StringRefAddr, whose type is "LinkAddress",
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* and whose contents is the link name. The class name field of the
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* Reference is that of this (LinkRef) class.
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*<p>
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* LinkRef is bound to a name using the normal Context.bind()/rebind(), and
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* DirContext.bind()/rebind(). Context.lookupLink() is used to retrieve the link
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* itself if the terminal atomic name is bound to a link.
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*<p>
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* Many naming systems support a native notion of link that may be used
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* within the naming system itself. JNDI does not specify whether
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* there is any relationship between such native links and JNDI links.
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*<p>
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* A LinkRef instance is not synchronized against concurrent access by multiple
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* threads. Threads that need to access a LinkRef instance concurrently should
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* synchronize amongst themselves and provide the necessary locking.
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*
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* @author Rosanna Lee
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* @author Scott Seligman
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*
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* @see LinkException
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* @see LinkLoopException
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* @see MalformedLinkException
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* @see Context#lookupLink
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* @since 1.3
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*/
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/*<p>
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* The serialized form of a LinkRef object consists of the serialized
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* fields of its Reference superclass.
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*/
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public class LinkRef extends Reference {
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/* code for link handling */
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static final String linkClassName = LinkRef.class.getName();
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static final String linkAddrType = "LinkAddress";
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/**
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* Constructs a LinkRef for a name.
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* @param linkName The non-null name for which to create this link.
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*/
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public LinkRef(Name linkName) {
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super(linkClassName, new StringRefAddr(linkAddrType, linkName.toString()));
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}
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/**
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* Constructs a LinkRef for a string name.
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* @param linkName The non-null name for which to create this link.
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*/
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public LinkRef(String linkName) {
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super(linkClassName, new StringRefAddr(linkAddrType, linkName));
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}
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/**
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* Retrieves the name of this link.
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*
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* @return The non-null name of this link.
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* @exception MalformedLinkException If a link name could not be extracted
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* @exception NamingException If a naming exception was encountered.
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*/
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public String getLinkName() throws NamingException {
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if (className != null && className.equals(linkClassName)) {
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RefAddr addr = get(linkAddrType);
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if (addr != null && addr instanceof StringRefAddr) {
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return (String)((StringRefAddr)addr).getContent();
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}
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}
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throw new MalformedLinkException();
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}
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/**
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* Use serialVersionUID from JNDI 1.1.1 for interoperability
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*/
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private static final long serialVersionUID = -5386290613498931298L;
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}
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