PropertyPathExpressionTest.java

package com.blazebit.reflection;

import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class PropertyPathExpressionTest {

	private PropertyPathExpression<Car, String> nameExpression = new PropertyPathExpression<Car, String>(
			Car.class, "name");
	private PropertyPathExpression<Car, String> vendorNameExpression = new PropertyPathExpression<Car, String>(
			Car.class, "vendor.name");

	@Test
	public void testSetValue() {
		Car o = new Car(null);
		nameExpression.setValue(o, "Test");
		assertEquals(o.getName(), "Test");
	}

	@Test
	public void testGetValue() {
		Car o;

		o = new Car(null);
		assertEquals(o.getName(), nameExpression.getValue(o));

		o = new Car("Test");
		assertEquals(o.getName(), nameExpression.getValue(o));
	}

	@SuppressWarnings("unchecked")
	@Test
	public void testGetValueWithUnresolveableTypeParameters() {
		GenericId<String> genericId = new GenericId<String>("test");

		assertEquals("test",
				new PropertyPathExpression<GenericId<String>, String>(
						(Class<GenericId<String>>) (Class<?>) GenericId.class,
						"id").getValue(genericId));
	}

	@Test
	public void testGetNullSafeValue() {
		Car o;

		o = new Car(null);
		assertEquals(null, vendorNameExpression.getNullSafeValue(o));

		o = new Car("Test", "Test");
		assertEquals(o.getVendor().getName(),
				vendorNameExpression.getNullSafeValue(o));
	}

	@Test(expected = NullPointerException.class)
	public void testGetValueExpectNPE() {
		vendorNameExpression.getValue(new Car(null));
	}

	@Test(expected = NullPointerException.class)
	public void testSetValueWithNull() {
		vendorNameExpression.setValue(new Car(null), "Test");
	}

	public class GenericId<X> {
		X id;

		public GenericId(X id) {
			this.id = id;
		}

		public X getId() {
			return id;
		}

		public void setId(X id) {
			this.id = id;
		}
	}

	public class Vendor {
		String name;

		public Vendor(String name) {
			this.name = name;
		}

		public String getName() {
			return name;
		}

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

	public class Car {
		String name;
		Vendor vendor;

		public Car() {

		}

		public Car(String name) {
			this.name = name;
		}

		public Car(String name, String vendorName) {
			this.name = name;
			this.vendor = new Vendor(vendorName);
		}

		public String getName() {
			return name;
		}

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

		public Vendor getVendor() {
			return vendor;
		}

		public void setVendor(Vendor vendor) {
			this.vendor = vendor;
		}
	}

}