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<pre><span class="sourceLineNo">001</span>/*-<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright 2015, 2016 Diamond Light Source Ltd.<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<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><a name="line.9"></a>
<span class="sourceLineNo">010</span>package org.eclipse.january.dataset;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Arrays;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>/**<a name="line.14"></a>
<span class="sourceLineNo">015</span> * Checks whether shape has changed between waits. Useful for where datasets are being extended.<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Note, {@link LazyDynamicDataset} already alerts its listeners when its shape is resized<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>public class ShapeChangeChecker implements IDatasetChangeChecker {<a name="line.18"></a>
<span class="sourceLineNo">019</span> <a name="line.19"></a>
<span class="sourceLineNo">020</span> private ILazyDataset lazy;<a name="line.20"></a>
<span class="sourceLineNo">021</span> private int[] shape;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span> @Override<a name="line.23"></a>
<span class="sourceLineNo">024</span> public void setDataset(ILazyDataset dataset) {<a name="line.24"></a>
<span class="sourceLineNo">025</span> if (dataset == null) {<a name="line.25"></a>
<span class="sourceLineNo">026</span> throw new IllegalArgumentException("Dataset must not be null");<a name="line.26"></a>
<span class="sourceLineNo">027</span> }<a name="line.27"></a>
<span class="sourceLineNo">028</span> lazy = dataset;<a name="line.28"></a>
<span class="sourceLineNo">029</span> shape = lazy.getShape();<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> @Override<a name="line.32"></a>
<span class="sourceLineNo">033</span> public boolean check() {<a name="line.33"></a>
<span class="sourceLineNo">034</span> int[] cshape = lazy.getShape();<a name="line.34"></a>
<span class="sourceLineNo">035</span> if (Arrays.equals(shape, cshape)) {<a name="line.35"></a>
<span class="sourceLineNo">036</span> return false;<a name="line.36"></a>
<span class="sourceLineNo">037</span> }<a name="line.37"></a>
<span class="sourceLineNo">038</span> shape = cshape;<a name="line.38"></a>
<span class="sourceLineNo">039</span> return true;<a name="line.39"></a>
<span class="sourceLineNo">040</span> }<a name="line.40"></a>
<span class="sourceLineNo">041</span>}<a name="line.41"></a>
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