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<title>altgraph.ObjectGraph — Graphs of objecs with an identifier &mdash; altgraph 0.11 documentation</title>
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<div class="section" id="module-altgraph.ObjectGraph">
<span id="altgraph-objectgraph-graphs-of-objecs-with-an-identifier"></span><h1><a class="reference internal" href="#module-altgraph.ObjectGraph" title="altgraph.ObjectGraph: A graph of objects that have a &quot;graphident&quot; attribute."><tt class="xref py py-mod docutils literal"><span class="pre">altgraph.ObjectGraph</span></tt></a> &#8212; Graphs of objecs with an identifier<a class="headerlink" href="#module-altgraph.ObjectGraph" title="Permalink to this headline"></a></h1>
<dl class="class">
<dt id="altgraph.ObjectGraph.ObjectGraph">
<em class="property">class </em><tt class="descclassname">altgraph.ObjectGraph.</tt><tt class="descname">ObjectGraph</tt><big>(</big><span class="optional">[</span><em>graph</em><span class="optional">[</span>, <em>debug</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph" title="Permalink to this definition"></a></dt>
<dd><p>A graph of objects that have a &#8220;graphident&#8221; attribute. The
value of this attribute is the key for the object in the
graph.</p>
<p>The optional <em>graph</em> is a previously constructed
<a class="reference internal" href="graph.html#altgraph.Graph.Graph" title="altgraph.Graph.Graph"><tt class="xref py py-class docutils literal"><span class="pre">Graph</span></tt></a>.</p>
<p>The optional <em>debug</em> level controls the amount of debug output
(see <a class="reference internal" href="#altgraph.ObjectGraph.ObjectGraph.msg" title="altgraph.ObjectGraph.ObjectGraph.msg"><tt class="xref py py-meth docutils literal"><span class="pre">msg()</span></tt></a>, <a class="reference internal" href="#altgraph.ObjectGraph.ObjectGraph.msgin" title="altgraph.ObjectGraph.ObjectGraph.msgin"><tt class="xref py py-meth docutils literal"><span class="pre">msgin()</span></tt></a> and <a class="reference internal" href="#altgraph.ObjectGraph.ObjectGraph.msgout" title="altgraph.ObjectGraph.ObjectGraph.msgout"><tt class="xref py py-meth docutils literal"><span class="pre">msgout()</span></tt></a>).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">the altgraph library does not generate output, the
debug attribute and message methods are present for use
by subclasses.</p>
</div>
</dd></dl>
<dl class="data">
<dt id="altgraph.ObjectGraph.ObjectGraph.graph">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">graph</tt><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.graph" title="Permalink to this definition"></a></dt>
<dd><p>An <a class="reference internal" href="graph.html#altgraph.Graph.Graph" title="altgraph.Graph.Graph"><tt class="xref py py-class docutils literal"><span class="pre">Graph</span></tt></a> object that contains
the graph data.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.addNode">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">addNode</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.addNode" title="Permalink to this definition"></a></dt>
<dd><p>Adds a <em>node</em> to the graph.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">re-adding a node that was previously removed
using <a class="reference internal" href="#altgraph.ObjectGraph.ObjectGraph.removeNode" title="altgraph.ObjectGraph.ObjectGraph.removeNode"><tt class="xref py py-meth docutils literal"><span class="pre">removeNode()</span></tt></a> will reinstate the previously
removed node.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.createNode">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">createNode</tt><big>(</big><em>self</em>, <em>cls</em>, <em>name</em>, <em>*args</em>, <em>**kwds</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.createNode" title="Permalink to this definition"></a></dt>
<dd><p>Creates a new node using <tt class="docutils literal"><span class="pre">cls(*args,</span> <span class="pre">**kwds)</span></tt> and adds that
node using <a class="reference internal" href="#altgraph.ObjectGraph.ObjectGraph.addNode" title="altgraph.ObjectGraph.ObjectGraph.addNode"><tt class="xref py py-meth docutils literal"><span class="pre">addNode()</span></tt></a>.</p>
<p>Returns the newly created node.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.removeNode">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">removeNode</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.removeNode" title="Permalink to this definition"></a></dt>
<dd><p>Removes a <em>node</em> from the graph when it exists. The <em>node</em> argument
is either a node object, or the graphident of a node.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.createReferences">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">createReferences</tt><big>(</big><em>fromnode</em>, <em>tonode</em><span class="optional">[</span>, <em>edge_data</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.createReferences" title="Permalink to this definition"></a></dt>
<dd><p>Creates a reference from <em>fromnode</em> to <em>tonode</em>. The optional
<em>edge_data</em> is associated with the edge.</p>
<p><em>Fromnode</em> and <em>tonode</em> can either be node objects or the graphident
values for nodes.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.removeReference">
<tt class="descclassname">altgraph.ObjectGraph.</tt><tt class="descname">removeReference</tt><big>(</big><em>fromnode</em>, <em>tonode</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.removeReference" title="Permalink to this definition"></a></dt>
<dd><p>Removes the reference from <em>fromnode</em> to <em>tonode</em> if it exists.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.getRawIdent">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">getRawIdent</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.getRawIdent" title="Permalink to this definition"></a></dt>
<dd><p>Returns the <em>graphident</em> attribute of <em>node</em>, or the graph itself
when <em>node</em> is <a class="reference external" href="http://docs.python.org/library/constants.html#None" title="(in Python v2.7)"><tt class="xref py py-data docutils literal"><span class="pre">None</span></tt></a>.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.getIdent">
<tt class="descclassname">altgraph.ObjectGraph.</tt><tt class="descname">getIdent</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.getIdent" title="Permalink to this definition"></a></dt>
<dd><p>Same as <tt class="xref py py-meth docutils literal"><span class="pre">getRawIdent()</span></tt>, but only if the node is part
of the graph.</p>
<p><em>Node</em> can either be an actual node object or the graphident of
a node.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.findNode">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">findNode</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.findNode" title="Permalink to this definition"></a></dt>
<dd><p>Returns a given node in the graph, or <tt class="xref py py-data docutils literal"><span class="pre">Node</span></tt> when it cannot
be found.</p>
<p><em>Node</em> is either an object with a <em>graphident</em> attribute or
the <em>graphident</em> attribute itself.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.__contains__">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">__contains__</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.__contains__" title="Permalink to this definition"></a></dt>
<dd><p>Returns True if <em>node</em> is a member of the graph. <em>Node</em> is either an
object with a <em>graphident</em> attribute or the <em>graphident</em> attribute itself.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.flatten">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">flatten</tt><big>(</big><span class="optional">[</span><em>condition</em><span class="optional">[</span>, <em>start</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.flatten" title="Permalink to this definition"></a></dt>
<dd><p>Yield all nodes that are entirely reachable by <em>condition</em>
starting fromt he given <em>start</em> node or the graph root.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">objects are only reachable from the graph root
when there is a reference from the root to the node
(either directly or through another node)</p>
</div>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.nodes">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">nodes</tt><big>(</big><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.nodes" title="Permalink to this definition"></a></dt>
<dd><p>Yield all nodes in the graph.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.get_edges">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">get_edges</tt><big>(</big><em>node</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.get_edges" title="Permalink to this definition"></a></dt>
<dd><p>Returns two iterators that yield the nodes reaching by
outgoing and incoming edges.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.filterStack">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">filterStack</tt><big>(</big><em>filters</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.filterStack" title="Permalink to this definition"></a></dt>
<dd><p>Filter the ObjectGraph in-place by removing all edges to nodes that
do not match every filter in the given filter list</p>
<p>Returns a tuple containing the number of:
(<em>nodes_visited</em>, <em>nodes_removed</em>, <em>nodes_orphaned</em>)</p>
</dd></dl>
<div class="section" id="debug-output">
<h2>Debug output<a class="headerlink" href="#debug-output" title="Permalink to this headline"></a></h2>
<dl class="data">
<dt id="altgraph.ObjectGraph.ObjectGraph.debug">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">debug</tt><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.debug" title="Permalink to this definition"></a></dt>
<dd><p>The current debug level.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.msg">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">msg</tt><big>(</big><em>level</em>, <em>text</em>, <em>*args</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.msg" title="Permalink to this definition"></a></dt>
<dd><p>Print a debug message at the current indentation level when the current
debug level is <em>level</em> or less.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.msgin">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">msgin</tt><big>(</big><em>level</em>, <em>text</em>, <em>*args</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.msgin" title="Permalink to this definition"></a></dt>
<dd><p>Print a debug message when the current debug level is <em>level</em> or less,
and increase the indentation level.</p>
</dd></dl>
<dl class="method">
<dt id="altgraph.ObjectGraph.ObjectGraph.msgout">
<tt class="descclassname">ObjectGraph.</tt><tt class="descname">msgout</tt><big>(</big><em>level</em>, <em>text</em>, <em>*args</em><big>)</big><a class="headerlink" href="#altgraph.ObjectGraph.ObjectGraph.msgout" title="Permalink to this definition"></a></dt>
<dd><p>Decrease the indentation level and print a debug message when the
current debug level is <em>level</em> or less.</p>
</dd></dl>
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<li><a class="reference internal" href="#"><tt class="docutils literal"><span class="pre">altgraph.ObjectGraph</span></tt> &#8212; Graphs of objecs with an identifier</a><ul>
<li><a class="reference internal" href="#debug-output">Debug output</a></li>
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