src/test/java/org/yaml/snakeyaml/constructor/ClassTagsTest.java

/*
 * See LICENSE file in distribution for copyright and licensing information.
 */
package org.yaml.snakeyaml.constructor;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

import junit.framework.TestCase;

import org.yaml.snakeyaml.Dumper;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Loader;
import org.yaml.snakeyaml.TypeDescription;
import org.yaml.snakeyaml.Util;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.error.YAMLException;
import org.yaml.snakeyaml.nodes.Tags;
import org.yaml.snakeyaml.representer.Representer;

public class ClassTagsTest extends TestCase {

    public void testDefaultRepresenter() throws IOException {
        Car car = new Car();
        car.setPlate("12-XP-F4");
        List<Wheel> wheels = new LinkedList<Wheel>();
        for (int i = 1; i < 6; i++) {
            Wheel wheel = new Wheel();
            wheel.setId(i);
            wheels.add(wheel);
        }
        car.setWheels(wheels);
        assertEquals(Util.getLocalResource("constructor/car-with-tags.yaml"), new Yaml().dump(car));
    }

    public void testDumpClassTag() throws IOException {
        Car car = new Car();
        car.setPlate("12-XP-F4");
        List<Wheel> wheels = new LinkedList<Wheel>();
        for (int i = 1; i < 6; i++) {
            Wheel wheel = new Wheel();
            wheel.setId(i);
            wheels.add(wheel);
        }
        car.setWheels(wheels);
        Representer representer = new Representer();
        representer.addClassTag(Car.class, "!car");
        representer.addClassTag(Wheel.class, Tags.MAP);
        Dumper dumper = new Dumper(representer, new DumperOptions());
        Yaml yaml = new Yaml(dumper);
        String output = yaml.dump(car);
        assertEquals(Util.getLocalResource("constructor/car-without-tags.yaml"), output);
    }

    public void testLoadUnknounClassTag() throws IOException {
        try {
            Yaml yaml = new Yaml();
            yaml.load(Util.getLocalResource("constructor/car-without-tags.yaml"));
            fail("Must fail because of unknown tag: !car");
        } catch (YAMLException e) {
            assertTrue(e.getMessage().contains("Unknown tag: !car"));
        }

    }

    public void testLoadClassTag() throws IOException {
        Constructor constructor = new Constructor();
        constructor.addTypeDescription(new TypeDescription(Car.class, "!car"));
        Loader loader = new Loader(constructor);
        Yaml yaml = new Yaml(loader);
        String source = Util.getLocalResource("constructor/car-without-tags.yaml");
        System.out.println(source);
        Car car = (Car) yaml.load(source);
        assertEquals("12-XP-F4", car.getPlate());
        List<Wheel> wheels = car.getWheels();
        assertNotNull(wheels);
        assertEquals(5, wheels.size());
    }

    public void testNullDescription() throws IOException {
        Constructor constructor = new Constructor();
        try {
            constructor.addTypeDescription(null);
            fail("Description is required.");
        } catch (Exception e) {
            assertEquals("TypeDescription is required.", e.getMessage());
        }
    }

    public void testLoadClassNoRoot() throws IOException {
        Constructor constructor = new Constructor();
        TypeDescription carDescription = new TypeDescription(Car.class);
        carDescription.setRoot(true);
        constructor.addTypeDescription(carDescription);
        Loader loader = new Loader(constructor);
        Yaml yaml = new Yaml(loader);
        Car car = (Car) yaml.load(Util.getLocalResource("constructor/car-no-root-class.yaml"));
        assertEquals("12-XP-F4", car.getPlate());
        List<Wheel> wheels = car.getWheels();
        assertNotNull(wheels);
        assertEquals(5, wheels.size());
    }
}