/*
* Copyright 2012-2016 the original author or authors.
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.mongodb.core;
import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;
import java.util.Iterator;
import java.util.List;
import org.bson.Document;
import com.mongodb.BasicDBList;
/**
* Helper classes to ease assertions on {@link Document}s.
*
* @author Oliver Gierke
* @author Mark Paluch
*/
public abstract class DocumentTestUtils {
private DocumentTestUtils() {}
/**
* Expects the field with the given key to be not {@literal null} and a {@link Document} in turn and returns it.
*
* @param source the {@link Document} to lookup the nested one
* @param key the key of the field to lokup the nested {@link Document}
* @return
*/
public static Document getAsDocument(Document source, String key) {
return getTypedValue(source, key, Document.class);
}
/**
* Expects the field with the given key to be not {@literal null} and a {@link BasicDBList}.
*
* @param source the {@link Document} to lookup the {@link List} in
* @param key the key of the field to find the {@link List} in
* @return
*/
public static <T> List<T> getAsDBList(Document source, String key) {
return getTypedValue(source, key, List.class);
}
/**
* Expects the list element with the given index to be a non-{@literal null} {@link Document} and returns it.
*
* @param source the {@link List} to look up the {@link Document} element in
* @param index the index of the element expected to contain a {@link Document}
* @return
*/
public static Document getAsDocument(List<?> source, int index) {
assertThat(source.size(), greaterThanOrEqualTo(index + 1));
Object value = source.get(index);
assertThat(value, is(instanceOf(Document.class)));
return (Document) value;
}
@SuppressWarnings("unchecked")
public static <T> T getTypedValue(Document source, String key, Class<T> type) {
Object value = source.get(key);
assertThat(value, is(notNullValue()));
assertThat(value, is(instanceOf(type)));
return (T) value;
}
public static void assertTypeHint(Document document, Class<?> type) {
assertTypeHint(document, type.getName());
}
public static void assertTypeHint(Document document, String expectedTypeString) {
Iterator<String> keyIterator = document.keySet().iterator();
while (keyIterator.hasNext()) {
String key = keyIterator.next();
if (key.equals("_class")) {
assertThat((String) document.get(key), is(equalTo(expectedTypeString)));
assertThat(keyIterator.hasNext(), is(false));
return;
}
}
fail(String.format("Expected to find type info %s in %s.", document, expectedTypeString));
}
}