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<title>add_alias (OpenID::NamespaceMap)</title>
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<pre><span class="ruby-comment cmt"># File lib/openid/message.rb, line 475</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">add_alias</span>(<span class="ruby-identifier">namespace_uri</span>, <span class="ruby-identifier">desired_alias</span>, <span class="ruby-identifier">implicit</span>=<span class="ruby-keyword kw">false</span>)
<span class="ruby-comment cmt"># Check that desired_alias is not an openid protocol field as</span>
<span class="ruby-comment cmt"># per the spec.</span>
<span class="ruby-constant">Util</span>.<span class="ruby-identifier">assert</span>(<span class="ruby-operator">!</span><span class="ruby-constant">OPENID_PROTOCOL_FIELDS</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">desired_alias</span>),
<span class="ruby-node">"#{desired_alias} is not an allowed namespace alias"</span>)
<span class="ruby-comment cmt"># check that there is not a namespace already defined for the</span>
<span class="ruby-comment cmt"># desired alias</span>
<span class="ruby-identifier">current_namespace_uri</span> = <span class="ruby-ivar">@alias_to_namespace</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-identifier">desired_alias</span>, <span class="ruby-keyword kw">nil</span>)
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">current_namespace_uri</span> <span class="ruby-keyword kw">and</span> <span class="ruby-identifier">current_namespace_uri</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">namespace_uri</span>
<span class="ruby-identifier">raise</span> <span class="ruby-constant">IndexError</span>, <span class="ruby-node">"Cannot map #{namespace_uri} to alias #{desired_alias}. #{current_namespace_uri} is already mapped to alias #{desired_alias}"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># Check that desired_alias does not contain a period as per the</span>
<span class="ruby-comment cmt"># spec.</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">desired_alias</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">String</span>)
<span class="ruby-constant">Util</span>.<span class="ruby-identifier">assert</span>(<span class="ruby-identifier">desired_alias</span>.<span class="ruby-identifier">index</span>(<span class="ruby-value str">'.'</span>).<span class="ruby-identifier">nil?</span>,
<span class="ruby-node">"#{desired_alias} must not contain a dot"</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># check that there is not already a (different) alias for this</span>
<span class="ruby-comment cmt"># namespace URI.</span>
<span class="ruby-identifier">_alias</span> = <span class="ruby-ivar">@namespace_to_alias</span>[<span class="ruby-identifier">namespace_uri</span>]
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">_alias</span> <span class="ruby-keyword kw">and</span> <span class="ruby-identifier">_alias</span> <span class="ruby-operator">!=</span> <span class="ruby-identifier">desired_alias</span>
<span class="ruby-identifier">raise</span> <span class="ruby-constant">IndexError</span>, <span class="ruby-node">"Cannot map #{namespace_uri} to alias #{desired_alias}. It is already mapped to alias #{_alias}"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@alias_to_namespace</span>[<span class="ruby-identifier">desired_alias</span>] = <span class="ruby-identifier">namespace_uri</span>
<span class="ruby-ivar">@namespace_to_alias</span>[<span class="ruby-identifier">namespace_uri</span>] = <span class="ruby-identifier">desired_alias</span>
<span class="ruby-ivar">@implicit_namespaces</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">namespace_uri</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">implicit</span>
<span class="ruby-keyword kw">return</span> <span class="ruby-identifier">desired_alias</span>
<span class="ruby-keyword kw">end</span></pre>
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