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DefaultJsonLdDeserializerTest.java
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DefaultJsonLdDeserializerTest.java
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package cz.cvut.kbss.jsonld.deserialization;
import cz.cvut.kbss.jsonld.Constants;
import cz.cvut.kbss.jsonld.common.CollectionType;
import cz.cvut.kbss.jsonld.environment.Generator;
import cz.cvut.kbss.jsonld.environment.Vocabulary;
import cz.cvut.kbss.jsonld.environment.model.Employee;
import cz.cvut.kbss.jsonld.environment.model.Organization;
import cz.cvut.kbss.jsonld.environment.model.Person;
import cz.cvut.kbss.jsonld.environment.model.User;
import cz.cvut.kbss.jsonld.exception.UnknownPropertyException;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.lang.reflect.Field;
import java.util.*;
import static org.junit.Assert.*;
public class DefaultJsonLdDeserializerTest {
@Rule
public ExpectedException thrown = ExpectedException.none();
private JsonLdDeserializer deserializer = new DefaultJsonLdDeserializer();
@Test
public void getCurrentRootReturnsNullIfThereIsNoRoot() {
assertNull(deserializer.getCurrentRoot());
}
@Test
public void openObjectCreatesNewInstanceOfSpecifiedClass() {
deserializer.openObject(Person.class);
final Object res = deserializer.getCurrentRoot();
assertNotNull(res);
assertTrue(res instanceof Person);
}
@Test
public void openCollectionCreatesSet() {
deserializer.openCollection(CollectionType.SET);
assertTrue(deserializer.getCurrentRoot() instanceof Set);
}
@Test
public void openCollectionInCollectionPushesOriginalCollectionToStack() throws Exception {
deserializer.openCollection(CollectionType.SET);
deserializer.openCollection(CollectionType.SET);
assertTrue(deserializer.getCurrentRoot() instanceof Set);
assertFalse(getOpenInstances().isEmpty());
assertTrue(getOpenInstances().peek().getInstance() instanceof Set);
assertNotSame(deserializer.getCurrentRoot(), getOpenInstances().peek().getInstance());
}
@Test
public void openObjectAddsObjectToCurrentlyOpenCollectionAndBecomesCurrentInstance() throws Exception {
deserializer.openCollection(CollectionType.SET);
deserializer.openObject(Employee.class);
final Object root = deserializer.getCurrentRoot();
assertTrue(root instanceof Employee);
assertFalse(getOpenInstances().isEmpty());
final Object stackTop = getOpenInstances().peek().getInstance();
assertTrue(stackTop instanceof Set);
final Set<?> set = (Set<?>) stackTop;
assertEquals(1, set.size());
assertSame(root, set.iterator().next());
}
@SuppressWarnings("unchecked")
private Stack<InstanceContext> getOpenInstances() throws Exception {
final Field stackField = DefaultJsonLdDeserializer.class.getDeclaredField("openInstances");
stackField.setAccessible(true);
return (Stack<InstanceContext>) stackField.get(deserializer);
}
@Test
public void closeObjectPopsPreviousInstanceFromTheStack() throws Exception {
deserializer.openCollection(CollectionType.SET);
final Object originalRoot = deserializer.getCurrentRoot();
assertTrue(originalRoot instanceof Set);
deserializer.openObject(Employee.class);
assertFalse(getOpenInstances().isEmpty());
deserializer.closeObject();
assertTrue(getOpenInstances().isEmpty());
assertSame(originalRoot, deserializer.getCurrentRoot());
}
@Test
public void closeObjectDoesNothingForRootObject() throws Exception {
deserializer.openObject(Person.class);
assertTrue(getOpenInstances().isEmpty());
final Object root = deserializer.getCurrentRoot();
deserializer.closeObject();
assertTrue(getOpenInstances().isEmpty());
assertSame(root, deserializer.getCurrentRoot());
}
@Test
public void addValueAddsValuesToCurrentlyOpenCollection() throws Exception {
final List<Integer> items = new ArrayList<>();
for (int i = 0; i < Generator.randomCount(10); i++) {
items.add(Generator.randomCount(Integer.MAX_VALUE));
}
deserializer.openCollection(CollectionType.LIST);
items.forEach(item -> deserializer.addValue(item));
assertTrue(deserializer.getCurrentRoot() instanceof List);
final List<?> result = (List<?>) deserializer.getCurrentRoot();
for (int i = 0; i < items.size(); i++) {
assertEquals(items.get(i), result.get(i));
}
}
@Test
public void openObjectByPropertyCreatesObjectOfCorrectType() throws Exception {
deserializer.openObject(Employee.class);
deserializer.openObject(Vocabulary.IS_MEMBER_OF);
assertTrue(deserializer.getCurrentRoot() instanceof Organization);
}
@Test
public void openObjectByPropertySetsNewInstanceAsFieldValueAndReplacesCurrentContext() throws Exception {
deserializer.openObject(Employee.class);
deserializer.openObject(Vocabulary.IS_MEMBER_OF);
assertFalse(getOpenInstances().isEmpty());
final Object top = getOpenInstances().peek().getInstance();
assertTrue(top instanceof Employee);
assertNotNull(((Employee) top).getEmployer());
}
@Test
public void addValueSetsPropertyValue() throws Exception {
deserializer.openObject(User.class);
final String firstName = "Catherine";
final String lastName = "Halsey";
deserializer.addValue(Vocabulary.FIRST_NAME, firstName);
deserializer.addValue(Vocabulary.LAST_NAME, lastName);
deserializer.addValue(Vocabulary.IS_ADMIN, true);
final User res = (User) deserializer.getCurrentRoot();
assertEquals(firstName, res.getFirstName());
assertEquals(lastName, res.getLastName());
assertTrue(res.getAdmin());
}
@Test
public void openCollectionByPropertyCreatesCollectionOfCorrectType() throws Exception {
deserializer.openObject(Organization.class);
deserializer.openCollection(Vocabulary.HAS_MEMBER);
assertFalse(getOpenInstances().isEmpty());
assertTrue(deserializer.getCurrentRoot() instanceof Set);
}
@Test
public void openCollectionByPropertySetsFieldValueAndPushesCurrentInstanceToStack() throws Exception {
deserializer.openObject(Organization.class);
deserializer.openCollection(Vocabulary.HAS_MEMBER);
assertFalse(getOpenInstances().isEmpty());
assertTrue(getOpenInstances().peek().getInstance() instanceof Organization);
final Organization org = (Organization) getOpenInstances().peek().getInstance();
assertSame(deserializer.getCurrentRoot(), org.getEmployees());
}
@Test
public void closeCollectionPopsLastInstanceFromStack() throws Exception {
deserializer.openObject(Organization.class);
final Object originalRoot = deserializer.getCurrentRoot();
deserializer.openCollection(Vocabulary.HAS_MEMBER);
assertFalse(getOpenInstances().isEmpty());
deserializer.closeCollection();
assertTrue(getOpenInstances().isEmpty());
assertSame(originalRoot, deserializer.getCurrentRoot());
}
@Test
public void closeCollectionDoesNothingWhenItIsTheTopElement() throws Exception {
deserializer.openCollection(CollectionType.SET);
assertTrue(getOpenInstances().isEmpty());
final Object root = deserializer.getCurrentRoot();
deserializer.closeCollection();
assertTrue(getOpenInstances().isEmpty());
assertSame(root, deserializer.getCurrentRoot());
}
@Test
public void objectIsStoredInKnownInstancesWhenItsIdIsRead() throws Exception {
final User user = Generator.generateUser();
deserializer.openObject(User.class);
deserializer.addValue(Constants.JSON_LD_ID, user.getUri().toString());
assertTrue(getKnownInstances().containsKey(user.getUri().toString()));
assertTrue(getKnownInstances().get(user.getUri().toString()) instanceof User);
}
@SuppressWarnings("unchecked")
private Map<String, Object> getKnownInstances() throws Exception {
final Field field = DefaultJsonLdDeserializer.class.getDeclaredField("knownInstances");
field.setAccessible(true);
return (Map<String, Object>) field.get(deserializer);
}
@Test
public void addValueOfUnknownPropertyUriThrowsUnknownPropertyException() throws Exception {
final String property = Generator.generateUri().toString();
thrown.expect(UnknownPropertyException.class);
thrown.expectMessage("No field matching property " + property + " was found in class " + Person.class +
" or its ancestors.");
deserializer.openObject(Person.class);
deserializer.addValue(property, "Test");
}
}