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JsonLdTreeBuilderTest.java
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JsonLdTreeBuilderTest.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jsonld.serialization;
import cz.cvut.kbss.jopa.CommonVocabulary;
import cz.cvut.kbss.jsonld.JsonLd;
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.serialization.model.*;
import org.junit.Test;
import java.lang.reflect.Field;
import java.util.*;
import static org.junit.Assert.*;
public class JsonLdTreeBuilderTest {
private JsonLdTreeBuilder treeBuilder = new JsonLdTreeBuilder();
@Test
public void openInstanceCreatesNewObjectNode() {
final User u = Generator.generateUser();
treeBuilder.openInstance(u);
assertTrue(treeBuilder.getTreeRoot() instanceof ObjectNode);
}
@Test
public void openInstancePushesOriginalCurrentToStack() throws Exception {
final Employee e = Generator.generateEmployee();
final Organization org = Generator.generateOrganization();
treeBuilder.openInstance(e);
treeBuilder.openInstance(org);
assertTrue(treeBuilder.getTreeRoot() instanceof ObjectNode);
assertFalse(getNodeStack().isEmpty());
}
@SuppressWarnings("unchecked")
private Stack<JsonNode> getNodeStack() throws Exception {
final Field stackField = JsonLdTreeBuilder.class.getDeclaredField("nodeStack");
stackField.setAccessible(true);
return (Stack<JsonNode>) stackField.get(treeBuilder);
}
@Test
public void openInstanceDoesNotPushOriginalCurrentToStackWhenItIsAlreadyClosed() throws Exception {
final Employee e = Generator.generateEmployee();
final Organization org = Generator.generateOrganization();
treeBuilder.openInstance(e);
assertTrue(getNodeStack().isEmpty());
treeBuilder.closeInstance(e);
treeBuilder.openInstance(org);
assertTrue(getNodeStack().isEmpty());
}
@Test
public void openInstanceAddsSingularTypeAttributeToNode() {
final Person p = new Person();
treeBuilder.openInstance(p);
assertNotNull(treeBuilder.getTreeRoot());
assertFalse(treeBuilder.getTreeRoot().getItems().isEmpty());
final CollectionNode typesNode = (CollectionNode) getNode(treeBuilder.getTreeRoot(), JsonLd.TYPE);
assertNotNull(typesNode);
assertTrue(typesNode.getItems().contains(JsonNodeFactory.createLiteralNode(Vocabulary.PERSON)));
}
@Test
public void openInstanceAddsArrayOfTypesToNode() throws Exception {
final Employee employee = Generator.generateEmployee();
treeBuilder.openInstance(employee);
assertTrue(getNodeStack().isEmpty());
assertFalse(treeBuilder.getTreeRoot().getItems().isEmpty());
final Set<String> types = new HashSet<>(Arrays.asList(Vocabulary.PERSON, Vocabulary.USER, Vocabulary.EMPLOYEE));
final CollectionNode typesNode = (CollectionNode) getNode(treeBuilder.getTreeRoot(), JsonLd.TYPE);
assertNotNull(typesNode);
for (String t : types) {
assertTrue(typesNode.getItems().contains(JsonNodeFactory.createLiteralNode(t)));
}
}
@Test
public void openInstanceAddsAttributeValueToItsParentObject() throws Exception {
final Employee employee = Generator.generateEmployee();
treeBuilder.openInstance(employee);
treeBuilder.visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
treeBuilder.openInstance(employee.getEmployer());
treeBuilder.closeInstance(employee.getEmployer());
treeBuilder.closeInstance(employee);
final CompositeNode employerNode = (CompositeNode) getNode(treeBuilder.getTreeRoot(), Vocabulary.IS_MEMBER_OF);
assertNotNull(employerNode);
}
private JsonNode getNode(CompositeNode parent, String name) {
for (JsonNode n : parent.getItems()) {
if (n.getName().equals(name)) {
return n;
}
}
return null;
}
@Test
public void closeInstanceClosesNodeAndDoesNothingWhenStackIsEmpty() throws Exception {
final User u = Generator.generateUser();
treeBuilder.openInstance(u);
assertTrue(getNodeStack().isEmpty());
assertTrue(treeBuilder.getTreeRoot() instanceof ObjectNode);
treeBuilder.closeInstance(u);
assertFalse(treeBuilder.getTreeRoot().isOpen());
assertTrue(getNodeStack().isEmpty());
}
@Test
public void closeInstancePopsOriginalCurrentFromStack() throws Exception {
final Employee e = Generator.generateEmployee();
final Organization org = Generator.generateOrganization();
treeBuilder.openInstance(e);
treeBuilder.openInstance(org);
assertTrue(treeBuilder.getTreeRoot() instanceof ObjectNode);
assertFalse(getNodeStack().isEmpty());
treeBuilder.closeInstance(org);
assertTrue(getNodeStack().isEmpty());
assertNotNull(treeBuilder.getTreeRoot());
}
@Test
public void openCollectionCreatesCollectionNode() throws Exception {
treeBuilder.openCollection(Collections.singleton(Generator.generateEmployee()));
final CompositeNode root = treeBuilder.getTreeRoot();
assertNotNull(root);
assertTrue(root instanceof CollectionNode);
}
@Test
public void openCollectionPushesCurrentNodeToStack() throws Exception {
final Organization org = Generator.generateOrganization();
final Employee employee = Generator.generateEmployee();
employee.setEmployer(org);
org.addEmployee(employee);
treeBuilder.openInstance(org);
assertTrue(getNodeStack().isEmpty());
treeBuilder.visitField(Organization.class.getDeclaredField("employees"), org.getEmployees());
treeBuilder.openCollection(org.getEmployees());
assertFalse(getNodeStack().isEmpty());
assertTrue(treeBuilder.getTreeRoot() instanceof CollectionNode);
}
@Test
public void closeCollectionPopsOriginalFromNodeFromStack() throws Exception {
final Organization org = Generator.generateOrganization();
final Employee employee = Generator.generateEmployee();
employee.setEmployer(org);
org.addEmployee(employee);
treeBuilder.openInstance(org);
treeBuilder.visitField(Organization.class.getDeclaredField("employees"), org.getEmployees());
treeBuilder.openCollection(org.getEmployees());
assertFalse(getNodeStack().isEmpty());
treeBuilder.closeCollection(org.getEmployees());
assertTrue(getNodeStack().isEmpty());
assertTrue(treeBuilder.getTreeRoot() instanceof ObjectNode);
}
@Test
public void visitFieldDoesNothingWhenFieldValueIsNull() throws Exception {
final Employee employee = Generator.generateEmployee();
employee.setEmployer(null);
treeBuilder.visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
final Field visitedFieldField = JsonLdTreeBuilder.class.getDeclaredField("visitedField");
visitedFieldField.setAccessible(true);
final Field visitedField = (Field) visitedFieldField.get(treeBuilder);
assertNull(visitedField);
assertNull(treeBuilder.getTreeRoot());
assertTrue(getNodeStack().isEmpty());
}
@Test
public void visitFieldStoresFieldWhenItIsObjectProperty() throws Exception {
final Employee employee = Generator.generateEmployee();
treeBuilder.visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
final Field visitedFieldField = JsonLdTreeBuilder.class.getDeclaredField("visitedField");
visitedFieldField.setAccessible(true);
final Field visitedField = (Field) visitedFieldField.get(treeBuilder);
assertNotNull(visitedField);
assertEquals(Employee.class.getDeclaredField("employer"), visitedField);
}
@Test
public void visitFieldExtractsValueOfDataPropertyAndAddsNodeToTheRoot() throws Exception {
final User user = Generator.generateUser();
treeBuilder.openInstance(user);
assertNotNull(treeBuilder.getTreeRoot());
treeBuilder.visitField(Person.class.getDeclaredField("firstName"), user.getFirstName());
assertFalse(treeBuilder.getTreeRoot().getItems().isEmpty());
assertTrue(treeBuilder.getTreeRoot().getItems()
.contains(JsonNodeFactory.createLiteralNode(Vocabulary.FIRST_NAME, user.getFirstName())));
}
@Test
public void visitFieldExtractsValueOfAnnotationPropertyAndAddsNodeToTheRoot() throws Exception {
final Organization org = Generator.generateOrganization();
treeBuilder.openInstance(org);
treeBuilder.visitField(Organization.class.getDeclaredField("name"), org.getName());
assertFalse(treeBuilder.getTreeRoot().getItems().isEmpty());
assertTrue(treeBuilder.getTreeRoot().getItems()
.contains(JsonNodeFactory.createLiteralNode(CommonVocabulary.RDFS_LABEL, org.getName())));
}
@Test
public void visitFieldExtractsValueOfPluralDataPropertyAndAddsCollectionNodeWithValuesToTheRoot() throws Exception {
final Organization org = Generator.generateOrganization();
treeBuilder.openInstance(org);
treeBuilder.visitField(Organization.class.getDeclaredField("brands"), org.getBrands());
assertFalse(treeBuilder.getTreeRoot().getItems().isEmpty());
final CollectionNode brandsNode = (CollectionNode) getNode(treeBuilder.getTreeRoot(), Vocabulary.BRAND);
assertNotNull(brandsNode);
assertTrue(brandsNode instanceof SetNode);
for (String brand : org.getBrands()) {
assertTrue(brandsNode.getItems().contains(JsonNodeFactory.createLiteralNode(brand)));
}
}
@Test
public void visitKnownInstanceAddsSingularObjectIdAttributeToTheParent() throws Exception {
final Employee employee = Generator.generateEmployee();
final Organization employer = employee.getEmployer();
employer.setEmployees(Collections.singleton(employee));
treeBuilder.openInstance(employer);
treeBuilder.visitField(Organization.class.getDeclaredField("employees"), employer.getEmployees());
treeBuilder.openCollection(employer.getEmployees());
treeBuilder.openInstance(employee);
treeBuilder.visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
treeBuilder.visitKnownInstance(employee.getEmployer());
final JsonNode referenceNode = getNode(treeBuilder.getTreeRoot(), Vocabulary.IS_MEMBER_OF);
assertNotNull(referenceNode);
assertTrue(referenceNode instanceof ObjectIdNode);
}
@Test
public void visitKnownInstanceAddsCollectionOfObjectIdsToTheParent() throws Exception {
final Employee employee = Generator.generateEmployee();
final Organization employer = employee.getEmployer();
employer.setEmployees(Collections.singleton(employee));
treeBuilder.openInstance(employee);
treeBuilder.visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
treeBuilder.openInstance(employee.getEmployer());
treeBuilder.visitField(Organization.class.getDeclaredField("employees"), employer.getEmployees());
treeBuilder.openCollection(employer.getEmployees());
treeBuilder.visitKnownInstance(employer.getEmployees().iterator().next());
final CompositeNode node = treeBuilder.getTreeRoot();
assertTrue(node instanceof CollectionNode);
final JsonNode item = node.getItems().iterator().next();
assertTrue(item instanceof ObjectIdNode);
}
@Test
public void testAddCollectionItemAfterVisitKnownInstanceWasCalledInObject() throws Exception {
final Employee employee = Generator.generateEmployee();
final Employee employeeTwo = Generator.generateEmployee();
final Organization employer = employee.getEmployer();
employer.addEmployee(employee);
employer.addEmployee(employeeTwo);
employeeTwo.setEmployer(employer);
treeBuilder.openInstance(employer);
treeBuilder.visitField(Organization.class.getDeclaredField("employees"), employer.getEmployees());
treeBuilder.openCollection(employer.getEmployees());
treeBuilder.openInstance(employee);
treeBuilder.visitField(Employee.class.getDeclaredField("employer"), employee.getEmployer());
treeBuilder.visitKnownInstance(employee.getEmployer());
treeBuilder.closeInstance(employee);
treeBuilder.openInstance(employeeTwo);
assertNull(treeBuilder.getTreeRoot().getName());
}
@Test
public void testBuildTreeWithRootCollection() throws Exception {
final Set<User> users = Generator.generateUsers();
treeBuilder.openCollection(users);
for (User u : users) {
treeBuilder.openInstance(u);
treeBuilder.closeInstance(u);
}
treeBuilder.closeCollection(users);
final CompositeNode root = treeBuilder.getTreeRoot();
assertFalse(root.isOpen());
assertEquals(users.size(), root.getItems().size());
for (JsonNode item : root.getItems()) {
assertTrue(item instanceof ObjectNode);
assertNull(item.getName());
}
}
}