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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span>// $Id: ParseTreeWriter.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 java.io.PrintWriter;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.Writer;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * Writer for MDX parse tree.<a name="line.26"></a>
<span class="sourceLineNo">027</span> *<a name="line.27"></a>
<span class="sourceLineNo">028</span> * <p>Typical use is with the {@link ParseTreeNode#unparse(ParseTreeWriter)}<a name="line.28"></a>
<span class="sourceLineNo">029</span> * method as follows:<a name="line.29"></a>
<span class="sourceLineNo">030</span> *<a name="line.30"></a>
<span class="sourceLineNo">031</span> * <blockquote><a name="line.31"></a>
<span class="sourceLineNo">032</span> * <pre><a name="line.32"></a>
<span class="sourceLineNo">033</span> * ParseTreeNode node;<a name="line.33"></a>
<span class="sourceLineNo">034</span> * StringWriter sw = new StringWriter();<a name="line.34"></a>
<span class="sourceLineNo">035</span> * PrintWriter pw = new PrintWriter(sw);<a name="line.35"></a>
<span class="sourceLineNo">036</span> * ParseTreeWriter mdxWriter = new ParseTreeWriter(pw);<a name="line.36"></a>
<span class="sourceLineNo">037</span> * node.unparse(mdxWriter);<a name="line.37"></a>
<span class="sourceLineNo">038</span> * pw.flush();<a name="line.38"></a>
<span class="sourceLineNo">039</span> * String mdx = sw.toString();<a name="line.39"></a>
<span class="sourceLineNo">040</span> * </pre><a name="line.40"></a>
<span class="sourceLineNo">041</span> * </blockquote><a name="line.41"></a>
<span class="sourceLineNo">042</span> *<a name="line.42"></a>
<span class="sourceLineNo">043</span> *<a name="line.43"></a>
<span class="sourceLineNo">044</span> * @see org.olap4j.mdx.ParseTreeNode#unparse(ParseTreeWriter)<a name="line.44"></a>
<span class="sourceLineNo">045</span> *<a name="line.45"></a>
<span class="sourceLineNo">046</span> * @author jhyde<a name="line.46"></a>
<span class="sourceLineNo">047</span> * @version $Id: ParseTreeWriter.java 482 2012-01-05 23:27:27Z jhyde $<a name="line.47"></a>
<span class="sourceLineNo">048</span> * @since Jun 4, 2007<a name="line.48"></a>
<span class="sourceLineNo">049</span> */<a name="line.49"></a>
<span class="sourceLineNo">050</span>public class ParseTreeWriter {<a name="line.50"></a>
<span class="sourceLineNo">051</span> private final PrintWriter pw;<a name="line.51"></a>
<span class="sourceLineNo">052</span> private int linePrefixLength;<a name="line.52"></a>
<span class="sourceLineNo">053</span> private String linePrefix;<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span> private static final int INDENT = 4;<a name="line.55"></a>
<span class="sourceLineNo">056</span> private static String bigString = " ";<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span> /**<a name="line.58"></a>
<span class="sourceLineNo">059</span> * Creates a ParseTreeWriter.<a name="line.59"></a>
<span class="sourceLineNo">060</span> *<a name="line.60"></a>
<span class="sourceLineNo">061</span> * @param pw Underlying writer<a name="line.61"></a>
<span class="sourceLineNo">062</span> */<a name="line.62"></a>
<span class="sourceLineNo">063</span> public ParseTreeWriter(PrintWriter pw) {<a name="line.63"></a>
<span class="sourceLineNo">064</span> this((Writer)pw);<a name="line.64"></a>
<span class="sourceLineNo">065</span> }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> /**<a name="line.67"></a>
<span class="sourceLineNo">068</span> * Creates a ParseTreeWriter.<a name="line.68"></a>
<span class="sourceLineNo">069</span> *<a name="line.69"></a>
<span class="sourceLineNo">070</span> * @param w Underlying writer<a name="line.70"></a>
<span class="sourceLineNo">071</span> */<a name="line.71"></a>
<span class="sourceLineNo">072</span> public ParseTreeWriter(Writer w) {<a name="line.72"></a>
<span class="sourceLineNo">073</span> this.pw = new PrintWriter(w) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span> public void println() {<a name="line.75"></a>
<span class="sourceLineNo">076</span> super.println();<a name="line.76"></a>
<span class="sourceLineNo">077</span> print(linePrefix);<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> };<a name="line.79"></a>
<span class="sourceLineNo">080</span> this.linePrefixLength = 0;<a name="line.80"></a>
<span class="sourceLineNo">081</span> setPrefix();<a name="line.81"></a>
<span class="sourceLineNo">082</span> }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span> /**<a name="line.84"></a>
<span class="sourceLineNo">085</span> * Returns the print writer.<a name="line.85"></a>
<span class="sourceLineNo">086</span> *<a name="line.86"></a>
<span class="sourceLineNo">087</span> * @return print writer<a name="line.87"></a>
<span class="sourceLineNo">088</span> */<a name="line.88"></a>
<span class="sourceLineNo">089</span> public PrintWriter getPrintWriter() {<a name="line.89"></a>
<span class="sourceLineNo">090</span> return pw;<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span> /**<a name="line.93"></a>
<span class="sourceLineNo">094</span> * Increases the indentation level.<a name="line.94"></a>
<span class="sourceLineNo">095</span> */<a name="line.95"></a>
<span class="sourceLineNo">096</span> public void indent() {<a name="line.96"></a>
<span class="sourceLineNo">097</span> linePrefixLength += INDENT;<a name="line.97"></a>
<span class="sourceLineNo">098</span> setPrefix();<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span> private void setPrefix() {<a name="line.101"></a>
<span class="sourceLineNo">102</span> linePrefix = spaces(linePrefixLength);<a name="line.102"></a>
<span class="sourceLineNo">103</span> }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span> /**<a name="line.105"></a>
<span class="sourceLineNo">106</span> * Decreases the indentation level.<a name="line.106"></a>
<span class="sourceLineNo">107</span> */<a name="line.107"></a>
<span class="sourceLineNo">108</span> public void outdent() {<a name="line.108"></a>
<span class="sourceLineNo">109</span> linePrefixLength -= INDENT;<a name="line.109"></a>
<span class="sourceLineNo">110</span> setPrefix();<a name="line.110"></a>
<span class="sourceLineNo">111</span> }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span> /**<a name="line.113"></a>
<span class="sourceLineNo">114</span> * Returns a string of N spaces.<a name="line.114"></a>
<span class="sourceLineNo">115</span> * @param n Number of spaces<a name="line.115"></a>
<span class="sourceLineNo">116</span> * @return String of N spaces<a name="line.116"></a>
<span class="sourceLineNo">117</span> */<a name="line.117"></a>
<span class="sourceLineNo">118</span> private static synchronized String spaces(int n)<a name="line.118"></a>
<span class="sourceLineNo">119</span> {<a name="line.119"></a>
<span class="sourceLineNo">120</span> while (n > bigString.length()) {<a name="line.120"></a>
<span class="sourceLineNo">121</span> bigString = bigString + bigString;<a name="line.121"></a>
<span class="sourceLineNo">122</span> }<a name="line.122"></a>
<span class="sourceLineNo">123</span> return bigString.substring(0, n);<a name="line.123"></a>
<span class="sourceLineNo">124</span> }<a name="line.124"></a>
<span class="sourceLineNo">125</span>}<a name="line.125"></a>
<span class="sourceLineNo">126</span><a name="line.126"></a>
<span class="sourceLineNo">127</span>// End ParseTreeWriter.java<a name="line.127"></a>
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