SelectorSamplerBaselineMatcher.java
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package io.wcm.qa.glnm.hamcrest.baseline;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.function.Supplier;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.Matchers;
import io.wcm.qa.glnm.differences.base.Difference;
import io.wcm.qa.glnm.differences.difference.sut.SelectorDifference;
import io.wcm.qa.glnm.exceptions.GaleniumException;
import io.wcm.qa.glnm.persistence.SamplePersistence;
import io.wcm.qa.glnm.sampling.element.base.SelectorBasedSampler;
import io.wcm.qa.glnm.selectors.base.Selector;
class SelectorSamplerBaselineMatcher<S>
extends BaselineMatcher<Selector, S> {
private SelectorBasedSampler<S> sampler;
private final Class<? extends SelectorBasedSampler<S>> samplerClass;
private Selector selector;
@SuppressWarnings("unchecked")
SelectorSamplerBaselineMatcher(
Supplier<SamplePersistence<S>> persistenceSupplier,
Class<? extends SelectorBasedSampler<S>> baselineSamplerClass) {
super(
persistenceSupplier,
item -> ((S)constructSampler(baselineSamplerClass, item).sampleValue()));
samplerClass = baselineSamplerClass;
}
@SuppressWarnings("unchecked")
private SelectorBasedSampler<S> getSampler(Selector item) {
if (sampler == null || !item.equals(selector)) {
sampler = constructSampler(samplerClass, item);
selector = item;
}
return sampler;
}
private Matcher<S> internalMatcher() {
return Matchers.is(baseline());
}
private S sampleFrom(Selector item) {
return getSampler(item).sampleValue();
}
@Override
protected void describeMismatchSafely(Selector item, Description mismatchDescription) {
internalMatcher().describeMismatch(sampleFrom(item), mismatchDescription);
}
@Override
protected Collection<? extends Difference> differencesFor(Selector item) {
Collection<Difference> differences = new ArrayList<Difference>();
differences.add(new SelectorDifference(item));
return differences;
}
@Override
protected boolean matchesBaseline(Selector item) {
return internalMatcher().matches(sampleFrom(item));
}
private static SelectorBasedSampler constructSampler(
Class<? extends SelectorBasedSampler> baselineSamplerClass,
Selector item) {
try {
return baselineSamplerClass
.getConstructor(Selector.class)
.newInstance(item);
}
catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException
| SecurityException ex) {
throw new GaleniumException("When constructing sampler for baselining.", ex);
}
}
}