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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 a contiguous dataset using strides<a name="line.19"></a> |
| <span class="sourceLineNo">020</span> */<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>public class StrideIterator extends SliceIterator {<a name="line.21"></a> |
| <span class="sourceLineNo">022</span> private int[] stride;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span> private int[] delta; // reset values<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> private int nstart;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> private int element;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> private boolean zero;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span> public StrideIterator(final int[] shape) {<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> this(shape, null, 0);<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> }<a name="line.30"></a> |
| <span class="sourceLineNo">031</span><a name="line.31"></a> |
| <span class="sourceLineNo">032</span> public StrideIterator(final int isize, final int[] shape) {<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> this(isize, shape, null, 0);<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> }<a name="line.34"></a> |
| <span class="sourceLineNo">035</span><a name="line.35"></a> |
| <span class="sourceLineNo">036</span> public StrideIterator(final int[] shape, final int[] strides) {<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> this(shape, strides, 0);<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> public StrideIterator(final int[] shape, final int[] strides, final int offset) {<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> this(1, shape, strides, offset);<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> public StrideIterator(final int isize, final int[] shape, final int[] strides, final int offset) {<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> this(isize, shape, strides, offset, 0);<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> }<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> public StrideIterator(final int isize, final int[] shape, final int[] strides, final int offset, final int element) {<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> int rank = shape.length;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> start = new int[rank];<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> stop = shape;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> step = new int[rank];<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> Arrays.fill(step, 1);<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> this.sshape = shape;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> init(isize, shape, strides, offset, element);<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> reset();<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> }<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> public StrideIterator(final int isize, final int[] shape, final int[] start, final int[] stop, final int[] step) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> this(isize, shape, null, 0, start, stop, step);<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> public StrideIterator(final int isize, final int[] shape, final int[] oStrides, final int oOffset, final int[] start, final int[] stop, final int[] step) {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> this(isize, shape, oStrides, oOffset, new SliceND(shape, start, stop, step));<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> public StrideIterator(final int isize, final int[] shape, final int[] strides, final int offset, final SliceND slice) {<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> start = slice.getStart();<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> stop = slice.getStop();<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> step = slice.getStep();<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> this.sshape = slice.getShape();<a name="line.72"></a> |
| <span class="sourceLineNo">073</span><a name="line.73"></a> |
| <span class="sourceLineNo">074</span> init(isize, shape, strides, offset, 0);<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> reset();<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> }<a name="line.76"></a> |
| <span class="sourceLineNo">077</span><a name="line.77"></a> |
| <span class="sourceLineNo">078</span> private void init(final int isize, final int[] shape, final int[] strides, int offset, final int element) {<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> this.isize = isize;<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> istep = isize;<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> this.shape = shape;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> int rank = shape.length;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> endrank = rank - 1;<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> pos = new int[rank];<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> delta = new int[rank];<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> this.element = element;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> if (strides == null) {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> offset = 0;<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> stride = new int[rank];<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> int s = isize;<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> for (int j = endrank; j >= 0; j--) {<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> stride[j] = s;<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> s *= shape[j];<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> } else {<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> stride = strides.clone();<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> }<a name="line.97"></a> |
| <span class="sourceLineNo">098</span><a name="line.98"></a> |
| <span class="sourceLineNo">099</span> for (int j = endrank; j >= 0; j--) {<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> int t = stride[j];<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> offset += t * start[j];<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> t *= step[j];<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> stride[j] = t;<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> int s = sshape[j];<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> if (!zero) {<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> zero = s == 0;<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> }<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> delta[j] = s * t;<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> }<a name="line.109"></a> |
| <span class="sourceLineNo">110</span><a name="line.110"></a> |
| <span class="sourceLineNo">111</span> nstart = offset;<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> @Override<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> void calcGap() {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> // do nothing<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> }<a name="line.117"></a> |
| <span class="sourceLineNo">118</span><a name="line.118"></a> |
| <span class="sourceLineNo">119</span> @Override<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> public boolean hasNext() {<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> if (zero) {<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> return false;<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> }<a name="line.123"></a> |
| <span class="sourceLineNo">124</span><a name="line.124"></a> |
| <span class="sourceLineNo">125</span> // now move on one position<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> int j = endrank;<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> if (j < 0) {<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> index += istep;<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> return index < istep;<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> }<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> for (; j >= 0; j--) {<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> index += stride[j];<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> final int s = step[j];<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> final int p = pos[j] + s;<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> if ((s > 0 && p < stop[j]) || (s < 0 && p > stop[j])) {<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> pos[j] = p;<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> break;<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> }<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> pos[j] = start[j];<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> index -= delta[j]; // reset this dimension<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> }<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> return j >= 0;<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> }<a name="line.143"></a> |
| <span class="sourceLineNo">144</span><a name="line.144"></a> |
| <span class="sourceLineNo">145</span> @Override<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> public int[] getPos() {<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> return pos;<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> }<a name="line.148"></a> |
| <span class="sourceLineNo">149</span><a name="line.149"></a> |
| <span class="sourceLineNo">150</span> @Override<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> public void reset() {<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> System.arraycopy(start, 0, pos, 0, start.length);<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> if (endrank >= 0) {<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> pos[endrank] -= step[endrank];<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> index = nstart - stride[endrank];<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> } else {<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> index = -istep;<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> }<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> index += element;<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> }<a name="line.160"></a> |
| <span class="sourceLineNo">161</span>}<a name="line.161"></a> |
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| </pre> |
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