ObjectFieldWrapperTest.java

package org.springframework.data.simpledb.core.entity;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.util.Map;

import org.junit.Test;
import org.springframework.data.simpledb.util.EntityInformationSupport;

public class ObjectFieldWrapperTest {

	private static final String SAMPLE_STRING_VALUE = "foo";

	public static class AClass {

		private Object object = null;

		public Object getObject() {
			return object;
		}

		public void setObject(Object object) {
			this.object = object;
		}
	}

	public static class JSONCompatibleClass {

		private String name;

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}
	}

	@Test
	public void should_not_serialize_null_Object_fields_as_attribute_keys() {

		AClass aDomainObject = new AClass();

		EntityWrapper<AClass, String> sdbEntity = new EntityWrapper<AClass, String>(
				EntityInformationSupport.readEntityInformation(AClass.class), aDomainObject);
		final Map<String, String> attributes = sdbEntity.serialize();

		assertEquals(0, attributes.size());
	}

	@Test
	public void should_deserialize_serialized_null_Object_fields() {

		AClass aDomainObject = new AClass();

		EntityWrapper<AClass, String> sdbEntity = new EntityWrapper<AClass, String>(
				EntityInformationSupport.readEntityInformation(AClass.class), aDomainObject);
		final Map<String, String> attributes = sdbEntity.serialize();

		EntityWrapper<AClass, String> newSdbEntity = new EntityWrapper<AClass, String>(
				EntityInformationSupport.readEntityInformation(AClass.class));
		newSdbEntity.deserialize(attributes);
		AClass returnedEntity = newSdbEntity.getItem();

		assertEquals(null, returnedEntity.getObject());
	}

	@Test
	public void should_serialize_Object_fields_to_JSON() {

		AClass aDomainObject = new AClass();
		JSONCompatibleClass aJSONObject = new JSONCompatibleClass();
		aJSONObject.setName(SAMPLE_STRING_VALUE);

		aDomainObject.setObject(aJSONObject);

		EntityWrapper<AClass, String> sdbEntity = new EntityWrapper<AClass, String>(
				EntityInformationSupport.readEntityInformation(AClass.class), aDomainObject);
		final Map<String, String> attributes = sdbEntity.serialize();

		assertNotNull(attributes);

		String serializedValue = attributes.values().iterator().next();

		assertTrue(serializedValue.contains(SAMPLE_STRING_VALUE));
	}

	@Test
	public void should_deserialize_JSON_to_Object_field() {

		AClass aDomainObject = new AClass();
		JSONCompatibleClass aJSONObject = new JSONCompatibleClass();
		aJSONObject.setName(SAMPLE_STRING_VALUE);

		aDomainObject.setObject(aJSONObject);

		EntityWrapper<AClass, String> sdbEntity = new EntityWrapper<AClass, String>(
				EntityInformationSupport.readEntityInformation(AClass.class), aDomainObject);
		final Map<String, String> attributes = sdbEntity.serialize();

		EntityWrapper<AClass, String> newSdbEntity = new EntityWrapper<AClass, String>(
				EntityInformationSupport.readEntityInformation(AClass.class));
		newSdbEntity.deserialize(attributes);

		AClass returnedEntity = newSdbEntity.getItem();
		JSONCompatibleClass deserializedJSONObject = (JSONCompatibleClass) returnedEntity.getObject();

		assertEquals(aJSONObject.getName(), deserializedJSONObject.getName());

	}
}