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| <pre><span class="sourceLineNo">001</span>/*-<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *******************************************************************************<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Copyright (c) 2011, 2016 Diamond Light Source Ltd.<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * All rights reserved. This program and the accompanying materials<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * are made available under the terms of the Eclipse Public License v1.0<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * which accompanies this distribution, and is available at<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * http://www.eclipse.org/legal/epl-v10.html<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> *<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * Contributors:<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * Peter Chang - initial API and implementation and/or initial documentation<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *******************************************************************************/<a name="line.11"></a> |
| <span class="sourceLineNo">012</span><a name="line.12"></a> |
| <span class="sourceLineNo">013</span>package org.eclipse.january.dataset;<a name="line.13"></a> |
| <span class="sourceLineNo">014</span><a name="line.14"></a> |
| <span class="sourceLineNo">015</span>import java.util.Arrays;<a name="line.15"></a> |
| <span class="sourceLineNo">016</span><a name="line.16"></a> |
| <span class="sourceLineNo">017</span><a name="line.17"></a> |
| <span class="sourceLineNo">018</span>/**<a name="line.18"></a> |
| <span class="sourceLineNo">019</span> * Class to run over contiguous datasets and keep track of position. Note this is slower than ContiguousIterator<a name="line.19"></a> |
| <span class="sourceLineNo">020</span> */<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>public class ContiguousIteratorWithPosition extends IndexIterator {<a name="line.21"></a> |
| <span class="sourceLineNo">022</span> final private int[] shape;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span> final private int endrank; // last dimensions index<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> final private int imax; // maximum index in array<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> final private int istep; // step over items<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> final private int[] pos; // position in dataset<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span> /**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * Constructor for an iterator over the items of a dataset that are<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * within the dimensions<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> *<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * @param shape<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * @param length of entire data array<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> */<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> public ContiguousIteratorWithPosition(final int[] shape, final int length) {<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> this(shape, length, 1);<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> }<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * Constructor for an iterator over the items of a dataset that are<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * within the dimensions<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> *<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * @param shape<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * @param length of entire data array<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * @param isize number of elements in an item<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> */<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> public ContiguousIteratorWithPosition(final int[] shape, final int length, final int isize) {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> this.shape = shape;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> endrank = this.shape.length - 1;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> istep = isize;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> if (shape.length == 0) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> pos = new int[0];<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> } else {<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> pos = new int[endrank + 1];<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> pos[endrank] = -1;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> }<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> index = -isize;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> imax = length * isize;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> }<a name="line.59"></a> |
| <span class="sourceLineNo">060</span><a name="line.60"></a> |
| <span class="sourceLineNo">061</span> @Override<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> public boolean hasNext() {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> // now move on one position<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> int j = endrank;<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> for (; j >= 0; j--) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> pos[j]++;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> if (pos[j] >= shape[j]) {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> pos[j] = 0;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> } else {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> break;<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> }<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> }<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> if (j == -1 && endrank >= 0) {<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> return false;<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> }<a name="line.75"></a> |
| <span class="sourceLineNo">076</span><a name="line.76"></a> |
| <span class="sourceLineNo">077</span> index += istep;<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return index < imax;<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> /**<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * @return position indices (nb not a copy)<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> */<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> @Override<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> public int[] getPos() {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> return pos;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> }<a name="line.87"></a> |
| <span class="sourceLineNo">088</span><a name="line.88"></a> |
| <span class="sourceLineNo">089</span> @Override<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> public void reset() {<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> if (shape.length > 0) {<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> Arrays.fill(pos, 0);<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> pos[endrank] = -1;<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> index = -istep;<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> }<a name="line.96"></a> |
| <span class="sourceLineNo">097</span><a name="line.97"></a> |
| <span class="sourceLineNo">098</span> @Override<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> public int[] getShape() {<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> return shape;<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> }<a name="line.101"></a> |
| <span class="sourceLineNo">102</span>}<a name="line.102"></a> |
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| </pre> |
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