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Tensorics is a java framework which uses a tensor as a central object. A tensor represents a set of values placed in an N-dimensional space. Wherever you are tempted to use maps of maps, a tensor might be a good choice ;-) Tensorics provides methods to create, transform and performing calculations with those tensors.
// @formatter:off
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* This file is part of tensorics.
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* Copyright (c) 2008-2011, CERN. All rights reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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package org.tensorics.core.testing.hamcrest;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;
import org.tensorics.core.scalar.lang.ScalarSupport;
/**
* A matcher for unit tests, that allows to set a tolerance value. This matcher uses the scalar support of tensorics,
* thus it can be used on any scalars fro which a field is provided.
*
* @author kfuchsbe
* @param the type of the scalars (elements of the field)
*/
public class ScalarIsCloseTo extends TypeSafeMatcher {
private final ScalarSupport support;
private final S value;
private final S tolerance;
public ScalarIsCloseTo(ScalarSupport scalarSupport, S value, S tolerance) {
super();
this.support = checkNotNull(scalarSupport, "scalarSupport must not be null");
this.value = checkNotNull(value, "value must not be null");
this.tolerance = checkNotNull(tolerance, "tolerance must not be null");
checkArgument(support.testIf(tolerance).isGreaterOrEqualTo(support.zero()), "Tolerance must be positive.");
}
@Override
public void describeTo(Description description) {
description.appendText("within " + tolerance + " close to " + value);
}
@Override
protected boolean matchesSafely(S valueToAssert) {
S diff = support.calculate(valueToAssert).minus(value);
S absoluteDiff = support.absoluteValueOf(diff);
return support.testIf(absoluteDiff).isLessOrEqualTo(tolerance);
}
}