package org.rhq.test;
import static java.util.Arrays.asList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class CollectionMatchesChecker<T> {
private Collection<T> expected;
private Collection<T> actual;
private Set<String> ignoredProperties = new HashSet<String>();
private Double tolerance;
public void setExpected(Collection<T> expected) {
this.expected = expected;
}
public void setActual(Collection<T> actual) {
this.actual = actual;
}
public void setTolerance(Double tolerance) {
this.tolerance = tolerance;
}
public void setIgnoredProperties(String... ignoredProperties) {
this.ignoredProperties.addAll(asList(ignoredProperties));
}
public MatchResult execute() {
boolean isMatch = true;
StringBuilder details = new StringBuilder();
if (expected.size() != actual.size()) {
isMatch = false;
details.append("Expected " + expected.size() + " elements but found " + actual.size() + " elements\n");
}
List<T> elementsThatShouldBePresent = findMissingElements(expected, actual);
if (!elementsThatShouldBePresent.isEmpty()) {
isMatch = false;
details.append("Expected to find the following elements:\n\t" +
toString(elementsThatShouldBePresent) + "\n\n");
}
List<T> elementsThatShouldNotBePresent = findMissingElements(actual, expected);
if (!elementsThatShouldNotBePresent.isEmpty()) {
isMatch = false;
details.append("Did not expect to find the following elements:\n\t" +
toString(elementsThatShouldNotBePresent) + "\n\n");
}
if (!isMatch) {
details.append("expected: " + expected + "\n").append("actual: " + actual + "\n\n");
}
return new MatchResult(isMatch, details.toString());
}
private List<T> findMissingElements(Collection<T> elementsToSearchFor, Collection<T> elementsToSearch) {
List<T> missingElements = new ArrayList<T>();
for (T element : elementsToSearchFor) {
if (!containsMatch(elementsToSearch, element)) {
missingElements.add(element);
}
}
return missingElements;
}
private boolean containsMatch(Collection<T> elementsToSearch, T elementToSearchFor) {
for (T actual : elementsToSearch) {
PropertyMatcher<T> matcher = new PropertyMatcher<T>();
matcher.setExpected(elementToSearchFor);
matcher.setActual(actual);
matcher.setMaxDifference(tolerance);
matcher.setIgnoredProperties(ignoredProperties);
MatchResult result = matcher.execute();
if (result.isMatch()) {
return true;
}
}
return false;
}
private String toString(List<T> list) {
StringBuilder buffer = new StringBuilder("[");
for (T element : list) {
buffer.append(element.toString() + ", ");
}
buffer.delete(buffer.length() - 2, buffer.length());
buffer.append("]");
return buffer.toString();
}
}