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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span>// $Id: ParseTreeNode.java 482 2012-01-05 23:27:27Z jhyde $<a name="line.2"></a>
<span class="sourceLineNo">003</span>//<a name="line.3"></a>
<span class="sourceLineNo">004</span>// Licensed to Julian Hyde under one or more contributor license<a name="line.4"></a>
<span class="sourceLineNo">005</span>// agreements. See the NOTICE file distributed with this work for<a name="line.5"></a>
<span class="sourceLineNo">006</span>// additional information regarding copyright ownership.<a name="line.6"></a>
<span class="sourceLineNo">007</span>//<a name="line.7"></a>
<span class="sourceLineNo">008</span>// Julian Hyde licenses this file to you under the Apache License,<a name="line.8"></a>
<span class="sourceLineNo">009</span>// Version 2.0 (the "License"); you may not use this file except in<a name="line.9"></a>
<span class="sourceLineNo">010</span>// compliance with the License. You may obtain a copy of the License at:<a name="line.10"></a>
<span class="sourceLineNo">011</span>//<a name="line.11"></a>
<span class="sourceLineNo">012</span>// http://www.apache.org/licenses/LICENSE-2.0<a name="line.12"></a>
<span class="sourceLineNo">013</span>//<a name="line.13"></a>
<span class="sourceLineNo">014</span>// Unless required by applicable law or agreed to in writing, software<a name="line.14"></a>
<span class="sourceLineNo">015</span>// distributed under the License is distributed on an "AS IS" BASIS,<a name="line.15"></a>
<span class="sourceLineNo">016</span>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.16"></a>
<span class="sourceLineNo">017</span>// See the License for the specific language governing permissions and<a name="line.17"></a>
<span class="sourceLineNo">018</span>// limitations under the License.<a name="line.18"></a>
<span class="sourceLineNo">019</span>*/<a name="line.19"></a>
<span class="sourceLineNo">020</span>package org.olap4j.mdx;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.olap4j.type.Type;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>/**<a name="line.24"></a>
<span class="sourceLineNo">025</span> * Node in a parse tree representing a parsed MDX statement.<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * <p>To convert a parse tree to an MDX string, use a {@link ParseTreeWriter}<a name="line.27"></a>
<span class="sourceLineNo">028</span> * and the {@link #unparse(ParseTreeWriter)} method.<a name="line.28"></a>
<span class="sourceLineNo">029</span> *<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @author jhyde<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @version $Id: ParseTreeNode.java 482 2012-01-05 23:27:27Z jhyde $<a name="line.31"></a>
<span class="sourceLineNo">032</span> * @since Jun 4, 2007<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>public interface ParseTreeNode {<a name="line.34"></a>
<span class="sourceLineNo">035</span> /**<a name="line.35"></a>
<span class="sourceLineNo">036</span> * Accepts a visitor to this MDX parse tree node.<a name="line.36"></a>
<span class="sourceLineNo">037</span> *<a name="line.37"></a>
<span class="sourceLineNo">038</span> * <p>The implementation should generally dispatches to the<a name="line.38"></a>
<span class="sourceLineNo">039</span> * {@link ParseTreeVisitor#visit} method appropriate to the type of expression.<a name="line.39"></a>
<span class="sourceLineNo">040</span> *<a name="line.40"></a>
<span class="sourceLineNo">041</span> * @param visitor Visitor<a name="line.41"></a>
<span class="sourceLineNo">042</span> * @return T, the specific return type of the visitor<a name="line.42"></a>
<span class="sourceLineNo">043</span> */<a name="line.43"></a>
<span class="sourceLineNo">044</span> <T> T accept(ParseTreeVisitor<T> visitor);<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span> /**<a name="line.46"></a>
<span class="sourceLineNo">047</span> * Returns the type of this expression.<a name="line.47"></a>
<span class="sourceLineNo">048</span> *<a name="line.48"></a>
<span class="sourceLineNo">049</span> * <p>Returns null if this node is not an expression, for instance a<a name="line.49"></a>
<span class="sourceLineNo">050</span> * <code>SELECT</code> node.<a name="line.50"></a>
<span class="sourceLineNo">051</span> *<a name="line.51"></a>
<span class="sourceLineNo">052</span> * @return type of this expression<a name="line.52"></a>
<span class="sourceLineNo">053</span> */<a name="line.53"></a>
<span class="sourceLineNo">054</span> Type getType();<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span> /**<a name="line.56"></a>
<span class="sourceLineNo">057</span> * Converts this node into MDX text.<a name="line.57"></a>
<span class="sourceLineNo">058</span> *<a name="line.58"></a>
<span class="sourceLineNo">059</span> * @param writer Parse tree writer<a name="line.59"></a>
<span class="sourceLineNo">060</span> */<a name="line.60"></a>
<span class="sourceLineNo">061</span> void unparse(ParseTreeWriter writer);<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> /**<a name="line.63"></a>
<span class="sourceLineNo">064</span> * Returns the region of the source code which this node was created from,<a name="line.64"></a>
<span class="sourceLineNo">065</span> * if it was created by parsing.<a name="line.65"></a>
<span class="sourceLineNo">066</span> *<a name="line.66"></a>
<span class="sourceLineNo">067</span> * <p>A non-leaf node's region will encompass the regions of all of its<a name="line.67"></a>
<span class="sourceLineNo">068</span> * children. For example, a the region of a function call node<a name="line.68"></a>
<span class="sourceLineNo">069</span> * <code>Crossjoin([Gender], {[Store].[USA]})</code> stretches from<a name="line.69"></a>
<span class="sourceLineNo">070</span> * the first character of the function name to the closing parenthesis.<a name="line.70"></a>
<span class="sourceLineNo">071</span> *<a name="line.71"></a>
<span class="sourceLineNo">072</span> * <p>Region may be null, if the node was created programmatically, not<a name="line.72"></a>
<span class="sourceLineNo">073</span> * from a piece of source code.<a name="line.73"></a>
<span class="sourceLineNo">074</span> *<a name="line.74"></a>
<span class="sourceLineNo">075</span> * @return Region of the source code this node was created from, if it was<a name="line.75"></a>
<span class="sourceLineNo">076</span> * created by parsing<a name="line.76"></a>
<span class="sourceLineNo">077</span> */<a name="line.77"></a>
<span class="sourceLineNo">078</span> ParseRegion getRegion();<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span> /**<a name="line.80"></a>
<span class="sourceLineNo">081</span> * Creates a deep copy of this ParseTreeNode object.<a name="line.81"></a>
<span class="sourceLineNo">082</span> *<a name="line.82"></a>
<span class="sourceLineNo">083</span> * <p>Note: implementing classes can return the concrete type instead<a name="line.83"></a>
<span class="sourceLineNo">084</span> * of ParseTreeNode (using Java 1.5 covariant return types)<a name="line.84"></a>
<span class="sourceLineNo">085</span> *<a name="line.85"></a>
<span class="sourceLineNo">086</span> * @return The deep copy of this ParseTreeNode<a name="line.86"></a>
<span class="sourceLineNo">087</span> */<a name="line.87"></a>
<span class="sourceLineNo">088</span> ParseTreeNode deepCopy();<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>}<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>// End ParseTreeNode.java<a name="line.92"></a>
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