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<title>Class: Needle::Pipeline::Collection</title>
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<div id="classHeader">
<table class="header-table">
<tr class="top-aligned-row">
<td><strong>Class</strong></td>
<td class="class-name-in-header">Needle::Pipeline::Collection</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../files/lib/needle/pipeline/collection_rb.html">
lib/needle/pipeline/collection.rb
</a>
<br />
</td>
</tr>
<tr class="top-aligned-row">
<td><strong>Parent:</strong></td>
<td>
Object
</td>
</tr>
</table>
</div>
<!-- banner header -->
<div id="bodyContent">
<div id="contextContent">
<div id="description">
<p>
Represents a collection of pipeline elements. Elements may be added to the
pipeline, and then returned as a single object representing the chain of
pipeline elements.
</p>
</div>
</div>
<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000004">add</a>
<a href="#M000007">chain_to</a>
<a href="#M000005">get</a>
<a href="#M000003">new</a>
<a href="#M000006">reset!</a>
</div>
</div>
</div>
<!-- if includes -->
<div id="section">
<div id="class-list">
<h3 class="section-bar">Classes and Modules</h3>
Class <a href="Collection/BlockElement.html" class="link">Needle::Pipeline::Collection::BlockElement</a><br />
</div>
<!-- if method_list -->
<div id="methods">
<h3 class="section-bar">Public Class methods</h3>
<div id="method-M000003" class="method-detail">
<a name="M000003"></a>
<div class="method-heading">
<a href="#M000003" class="method-signature">
<span class="method-name">new</span><span class="method-args">( service_point )</span>
</a>
</div>
<div class="method-description">
<p>
Create a new pipeline element collection, initially empty.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000003-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000003-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/pipeline/collection.rb, line 49</span>
49: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">initialize</span>( <span class="ruby-identifier">service_point</span> )
50: <span class="ruby-ivar">@elements</span> = []
51: <span class="ruby-ivar">@service_point</span> = <span class="ruby-identifier">service_point</span>
52: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000004" class="method-detail">
<a name="M000004"></a>
<div class="method-heading">
<a href="#M000004" class="method-signature">
<span class="method-name">add</span><span class="method-args">( *args, &block )</span>
</a>
</div>
<div class="method-description">
<p>
Add a new pipeline element to this collection. If the first parameter is a
symbol or a string, it is taken to be the name of the element to add. If no
explicit implementation is given, then the implementation is looked up in
the <tt>:pipeline_elements</tt> service, using the given name.
</p>
<p>
After the first parameter, if the next parameter is numeric, it is taken to
mean the priority of the element. This overrides whatever default priority
is given for the selected element.
</p>
<p>
If the next parameter responds to the <tt>:new</tt> message, it is taken to
be an explicit implementation of the element. This is only valid if a block
is not given. If a block is given, then it is always taken to be the
implementation of the element.
</p>
<p>
If the last parameter is a Hash, it is taken to be a map of options that
should be passed to the element when it is instantiated.
</p>
<p>
This returns <tt>self</tt>, so that <a
href="Collection.html#M000004">add</a> calls may be chained.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000004-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000004-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/pipeline/collection.rb, line 73</span>
73: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">add</span>( <span class="ruby-operator">*</span><span class="ruby-identifier">args</span>, <span class="ruby-operator">&</span><span class="ruby-identifier">block</span> )
74: <span class="ruby-identifier">name</span> = <span class="ruby-identifier">priority</span> = <span class="ruby-keyword kw">nil</span>
75: <span class="ruby-identifier">options</span> = {}
76: <span class="ruby-identifier">klass</span> = <span class="ruby-keyword kw">nil</span>
77: <span class="ruby-identifier">element</span> = <span class="ruby-keyword kw">nil</span>
78:
79: <span class="ruby-keyword kw">if</span> [ <span class="ruby-constant">Symbol</span>, <span class="ruby-constant">String</span> ].<span class="ruby-identifier">any?</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">is_a?</span>( <span class="ruby-identifier">i</span> ) }
80: <span class="ruby-identifier">name</span> = <span class="ruby-identifier">args</span>.<span class="ruby-identifier">shift</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">intern</span>
81: <span class="ruby-keyword kw">end</span>
82: <span class="ruby-identifier">priority</span> = <span class="ruby-identifier">args</span>.<span class="ruby-identifier">shift</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">is_a?</span>( <span class="ruby-constant">Numeric</span> )
83: <span class="ruby-identifier">klass</span> = <span class="ruby-identifier">args</span>.<span class="ruby-identifier">shift</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">respond_to?</span>( <span class="ruby-identifier">:new</span> ) <span class="ruby-operator">&&</span> <span class="ruby-identifier">block</span>.<span class="ruby-identifier">nil?</span>
84: <span class="ruby-identifier">options</span> = <span class="ruby-identifier">args</span>.<span class="ruby-identifier">shift</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">is_a?</span>( <span class="ruby-constant">Hash</span> )
85:
86: <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>,
87: <span class="ruby-node">"bad argument list #{args.inspect}"</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">empty?</span>
88:
89: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">block</span>
90: <span class="ruby-identifier">element</span> = <span class="ruby-constant">BlockElement</span>.<span class="ruby-identifier">new</span>( <span class="ruby-ivar">@service_point</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">priority</span>,
91: <span class="ruby-identifier">options</span>, <span class="ruby-identifier">block</span> )
92: <span class="ruby-keyword kw">else</span>
93: <span class="ruby-identifier">klass</span> <span class="ruby-operator">||=</span> <span class="ruby-ivar">@service_point</span>.<span class="ruby-identifier">container</span>[<span class="ruby-identifier">:pipeline_elements</span>].<span class="ruby-identifier">fetch</span>( <span class="ruby-identifier">name</span> )
94: <span class="ruby-identifier">element</span> = <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">new</span>( <span class="ruby-ivar">@service_point</span>, <span class="ruby-identifier">name</span>, <span class="ruby-identifier">priority</span>, <span class="ruby-identifier">options</span> )
95: <span class="ruby-keyword kw">end</span>
96:
97: <span class="ruby-ivar">@elements</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">element</span>
98: <span class="ruby-keyword kw">self</span>
99: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000007" class="method-detail">
<a name="M000007"></a>
<div class="method-heading">
<a href="#M000007" class="method-signature">
<span class="method-name">chain_to</span><span class="method-args">( block )</span>
</a>
</div>
<div class="method-description">
<p>
Builds a linked list of the elements, with the last element being the block
(or block-like) object given by the parameter. Higher-priority elements
will be closer to the head of the list.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000007-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000007-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/pipeline/collection.rb, line 120</span>
120: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">chain_to</span>( <span class="ruby-identifier">block</span> )
121: <span class="ruby-identifier">head</span> = <span class="ruby-identifier">tail</span> = <span class="ruby-keyword kw">nil</span>
122: <span class="ruby-ivar">@elements</span>.<span class="ruby-identifier">sort</span>.<span class="ruby-identifier">reverse</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">el</span><span class="ruby-operator">|</span>
123: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">head</span>
124: <span class="ruby-identifier">tail</span>.<span class="ruby-identifier">succ</span> = <span class="ruby-identifier">el</span>
125: <span class="ruby-identifier">tail</span> = <span class="ruby-identifier">el</span>
126: <span class="ruby-keyword kw">else</span> <span class="ruby-comment cmt"># first time through...</span>
127: <span class="ruby-identifier">head</span> = <span class="ruby-identifier">tail</span> = <span class="ruby-identifier">el</span>
128: <span class="ruby-keyword kw">end</span>
129: <span class="ruby-keyword kw">end</span>
130:
131: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">tail</span>
132: <span class="ruby-identifier">tail</span>.<span class="ruby-identifier">succ</span> = <span class="ruby-identifier">block</span>
133: <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">head</span>
134: <span class="ruby-keyword kw">else</span>
135: <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">block</span>
136: <span class="ruby-keyword kw">end</span>
137: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000005" class="method-detail">
<a name="M000005"></a>
<div class="method-heading">
<a href="#M000005" class="method-signature">
<span class="method-name">get</span><span class="method-args">( name )</span>
</a>
</div>
<div class="method-description">
<p>
Returns the first pipeline element with the given name, or <tt>nil</tt> if
no such element exists.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000005-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000005-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/pipeline/collection.rb, line 103</span>
103: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">get</span>( <span class="ruby-identifier">name</span> )
104: <span class="ruby-identifier">name</span> = <span class="ruby-identifier">name</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">intern</span>
105: <span class="ruby-ivar">@elements</span>.<span class="ruby-identifier">find</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">el</span><span class="ruby-operator">|</span> <span class="ruby-identifier">name</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">el</span>.<span class="ruby-identifier">name</span> }
106: <span class="ruby-keyword kw">end</span>
</pre>
</div>
</div>
</div>
<div id="method-M000006" class="method-detail">
<a name="M000006"></a>
<div class="method-heading">
<a href="#M000006" class="method-signature">
<span class="method-name">reset!</span><span class="method-args">( *args )</span>
</a>
</div>
<div class="method-description">
<p>
Clears the state for each named element. If no elements are named, all
elements are cleared.
</p>
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000006-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000006-source">
<pre>
<span class="ruby-comment cmt"># File lib/needle/pipeline/collection.rb, line 110</span>
110: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">reset!</span>( <span class="ruby-operator">*</span><span class="ruby-identifier">args</span> )
111: <span class="ruby-ivar">@elements</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">element</span><span class="ruby-operator">|</span>
112: <span class="ruby-identifier">element</span>.<span class="ruby-identifier">reset!</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">args</span>.<span class="ruby-identifier">include?</span>( <span class="ruby-identifier">element</span>.<span class="ruby-identifier">name</span> )
113: <span class="ruby-keyword kw">end</span>
114: <span class="ruby-keyword kw">self</span>
115: <span class="ruby-keyword kw">end</span>
</pre>
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