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package org.zwobble.mammoth.tests;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.Matchers;
import org.hamcrest.TypeSafeDiagnosingMatcher;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.List;
import java.util.Optional;
import static com.google.common.collect.Iterables.filter;
import static com.google.common.collect.Iterables.transform;
import static java.util.Arrays.asList;
public class DeepReflectionMatcher<T> extends TypeSafeDiagnosingMatcher<T> {
public static <T> Matcher<T> deepEquals(T value) {
return new DeepReflectionMatcher<>(value);
}
private final T expected;
public DeepReflectionMatcher(T expected) {
this.expected = expected;
}
@Override
protected boolean matchesSafely(T item, Description mismatchDescription) {
return matchesSafely("", expected, item, mismatchDescription);
}
private static <T> boolean matchesSafely(String path, T expected, T actual, Description mismatchDescription) {
if (expected instanceof List && actual instanceof List) {
return matchesList(path, (List)expected, (List)actual, mismatchDescription);
}
if (!expected.getClass().equals(actual.getClass())) {
mismatchDescription.appendText("was " + actual.getClass().getName());
return false;
}
if (expected instanceof Optional && actual instanceof Optional) {
return matchesOptional(path, (Optional)expected, (Optional)actual, mismatchDescription);
}
if (expected instanceof String) {
return matchesString(path, expected, actual, mismatchDescription);
}
for (Field field : fields(expected.getClass())) {
if (!matchesSafely(path + "." + field.getName(), readField(expected, field), readField(actual, field), mismatchDescription)) {
return false;
}
}
return true;
}
private static <T> boolean matchesList(String path, List<?> expected, List<?> actual, Description mismatchDescription) {
if (actual.size() > expected.size()) {
appendPath(mismatchDescription, path);
mismatchDescription.appendText("extra elements:" +
indentedList(transform(Iterables.skip(actual, expected.size()), DeepReflectionMatcher::generateDescriptionOfValue)));
return false;
}
if (actual.size() < expected.size()) {
appendPath(mismatchDescription, path);
mismatchDescription.appendText("missing elements:" +
indentedList(transform(Iterables.skip(expected, actual.size()), DeepReflectionMatcher::generateDescriptionOfValue)));
return false;
}
for (int index = 0; index < expected.size(); index++) {
if (!matchesSafely(path + "[" + index + "]", expected.get(index), actual.get(index), mismatchDescription)) {
return false;
}
}
return true;
}
private static boolean matchesOptional(String path, Optional expected, Optional actual, Description mismatchDescription) {
if (actual.isPresent() && !expected.isPresent()) {
appendPath(mismatchDescription, path);
mismatchDescription.appendText("had value " + generateDescriptionOfValue(actual.get()));
return false;
}
if (expected.isPresent() && !actual.isPresent()) {
appendPath(mismatchDescription, path);
mismatchDescription.appendText("was empty");
return false;
}
if (actual.isPresent() && expected.isPresent()) {
return matchesSafely(path, expected.get(), actual.get(), mismatchDescription);
}
return true;
}
private static <T> boolean matchesString(String path, T expected, T actual, Description mismatchDescription) {
Matcher<Object> matcher = Matchers.equalTo(expected);
if (!matcher.matches(actual)) {
appendPath(mismatchDescription, path);
matcher.describeMismatch(actual, mismatchDescription);
return false;
} else {
return true;
}
}
private static void appendPath(Description mismatchDescription, String path) {
mismatchDescription.appendText(path + ": ");
}
@Override
public void describeTo(Description description) {
description.appendText(generateDescriptionOfValue(expected));
}
private static String generateDescriptionOfValue(Object value) {
if (value instanceof String) {
return value.toString();
} else if (value instanceof Optional) {
Optional<?> optional = (Optional)value;
if (optional.isPresent()) {
return generateDescriptionOfValue(optional.get());
} else {
return "(empty)";
}
} else if (value instanceof List) {
List<?> list = (List)value;
return "[" + indentedList(transform(list, DeepReflectionMatcher::generateDescriptionOfValue)) + "]";
} else {
Class<?> clazz = value.getClass();
List<Field> fields = fields(clazz);
Iterable<String> fieldStrings = transform(
fields,
field -> field.getName() + "=" + generateDescriptionOfValue(readField(value, field)));
return String.format("%s(%s)", clazz.getSimpleName(), indentedList(fieldStrings));
}
}
private static String indentedList(Iterable<String> values) {
return Joiner.on(",").join(transform(values, value -> "\n " + indent(value)));
}
private static String indent(String value) {
return value.replaceAll("\n", "\n ");
}
private static ImmutableList<Field> fields(Class<?> clazz) {
return ImmutableList.copyOf(filter(
asList(clazz.getDeclaredFields()),
field -> !Modifier.isStatic(field.getModifiers())));
}
private static Object readField(Object obj, Field field) {
try {
field.setAccessible(true);
return field.get(obj);
} catch (IllegalAccessException exception) {
throw new RuntimeException(exception);
}
}
}
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