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/*
*
* * Copyright 2010, Unitils.org
* *
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
*
*/
package org.unitils.reflectionassert;
import junit.framework.Assert;
import junit.framework.AssertionFailedError;
import ognl.DefaultMemberAccess;
import ognl.Ognl;
import ognl.OgnlContext;
import ognl.OgnlException;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Transformer;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.unitils.core.UnitilsException;
import org.unitils.reflectionassert.difference.Difference;
import org.unitils.reflectionassert.report.impl.DefaultDifferenceReport;
import org.unitils.util.ReflectionUtils;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.Set;
import static junit.framework.Assert.assertNotNull;
import static org.unitils.reflectionassert.ReflectionComparatorFactory.createRefectionComparator;
import static org.unitils.reflectionassert.ReflectionComparatorMode.IGNORE_DEFAULTS;
import static org.unitils.reflectionassert.ReflectionComparatorMode.LENIENT_ORDER;
/**
* A class for asserting that 2 objects/collections are equal by comparing properties and fields of the
* objects/collections using reflection.
*
* The (combination of) comparator modes specify how strict the comparison must be:
*
ignore defaults: compare only arguments (and inner values) that have a non default value (eg null) as expected value
*
lenient dates: do not compare actual date values, just that they both have a value or not
*
lenient order: order is not important when comparing collections or arrays
*
*
* There are 2 versions of each method: a lenient and a reflection version.
* With the ref versions you can set the comparator modes explicitly (note: no modes means strict comparison). The len
* versions are the same as the ref versions but have lenient order and ignore defaults set by default.
*
* The name assert..ReflectionEquals is chosen instead of assert..Equals so it can be added as a static import
* without naming collisions.
*
* @author Tim Ducheyne
* @author Filip Neven
* @see ReflectionComparator
* @see ReflectionComparatorMode
*/
public class ReflectionAssert {
/**
* Asserts that two objects are equal. Reflection is used to compare all fields of these values.
* If they are not equal an AssertionFailedError is thrown.
*
* This is identical to assertReflectionEquals with
* lenient order and ignore defaults set as comparator modes.
*
* @param expected the expected object
* @param actual the given object
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertLenientEquals(Object expected, Object actual) throws AssertionFailedError {
assertLenientEquals(null, expected, actual);
}
/**
* Asserts that two objects are equal. Reflection is used to compare all fields of these values.
* If they are not equal an AssertionFailedError is thrown.
*
* The comparator modes determine how strict to compare the values.
*
* @param expected the expected object
* @param actual the given object
* @param modes the comparator modes
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertReflectionEquals(Object expected, Object actual, ReflectionComparatorMode... modes) throws AssertionFailedError {
assertReflectionEquals(null, expected, actual, modes);
}
/**
* Asserts that two objects are equal. Reflection is used to compare all fields of these values.
* If they are not equal an AssertionFailedError is thrown.
*
* This is identical to assertReflectionEquals with
* lenient order and ignore defaults set as comparator modes.
*
* @param message a message for when the assertion fails
* @param expected the expected object
* @param actual the given object
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertLenientEquals(String message, Object expected, Object actual) throws AssertionFailedError {
assertReflectionEquals(message, expected, actual, LENIENT_ORDER, IGNORE_DEFAULTS);
}
/**
* Asserts that two objects are equal. Reflection is used to compare all fields of these values.
* If they are not equal an AssertionFailedError is thrown.
*
* The comparator modes determine how strict to compare the values.
*
* @param message a message for when the assertion fails
* @param expected the expected object
* @param actual the given object
* @param modes the comparator modes
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertReflectionEquals(String message, Object expected, Object actual, ReflectionComparatorMode... modes) throws AssertionFailedError {
ReflectionComparator reflectionComparator = createRefectionComparator(modes);
Difference difference = reflectionComparator.getDifference(expected, actual);
if (difference != null) {
Assert.fail(getFailureMessage(message, difference));
}
}
/**
* @param message a custom user-provided message, null if the user didn't provide a message
* @param difference the difference, not null
* @return a failure message describing the difference found
*/
protected static String getFailureMessage(String message, Difference difference) {
StringBuilder failureMessage = new StringBuilder();
failureMessage.append(message == null ? "" : message + "\n");
failureMessage.append(new DefaultDifferenceReport().createReport(difference));
return failureMessage.toString();
}
/**
* Asserts that the value of a property of an object is equal to the given value.
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertLenientEquals is used to check whether both values are equal.
*
* This is identical to assertPropertyReflectionEquals with
* lenient order and ignore defaults set as comparator modes.
*
* @param propertyName the property, not null
* @param expectedPropertyValue the expected value
* @param actualObject the object that contains the property
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyLenientEquals(String propertyName, Object expectedPropertyValue, Object actualObject) throws AssertionFailedError {
assertPropertyLenientEquals(null, propertyName, expectedPropertyValue, actualObject);
}
/**
* Asserts that the value of a property of an object is equal to the given value.
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* The comparator modes determine how strict to compare the values.
*
* @param propertyName the property, not null
* @param expectedPropertyValue the expected value
* @param actualObject the object that contains the property
* @param modes the comparator modes
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyReflectionEquals(String propertyName, Object expectedPropertyValue, Object actualObject, ReflectionComparatorMode... modes) throws AssertionFailedError {
assertPropertyReflectionEquals(null, propertyName, expectedPropertyValue, actualObject, modes);
}
/**
* Asserts that the value of a property of an object is equal to the given value.
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* This is identical to assertPropertyReflectionEquals with
* lenient order and ignore defaults set as comparator modes.
*
* @param message a message for when the assertion fails
* @param propertyName the property, not null
* @param expectedPropertyValue the expected value
* @param actualObject the object that contains the property
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyLenientEquals(String message, String propertyName, Object expectedPropertyValue, Object actualObject) throws AssertionFailedError {
assertPropertyReflectionEquals(message, propertyName, expectedPropertyValue, actualObject, LENIENT_ORDER, IGNORE_DEFAULTS);
}
/**
* Asserts that the value of a property of an object is equal to the given value.
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* The comparator modes determine how strict to compare the values.
*
* @param message a message for when the assertion fails
* @param propertyName the property, not null
* @param expectedPropertyValue the expected value
* @param actualObject the object that contains the property
* @param modes the comparator modes
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyReflectionEquals(String message, String propertyName, Object expectedPropertyValue, Object actualObject, ReflectionComparatorMode... modes) throws AssertionFailedError {
assertNotNull("Actual object is null.", actualObject);
Object propertyValue = getProperty(actualObject, propertyName);
String formattedMessage = formatMessage(message, "Incorrect value for property: " + propertyName);
assertReflectionEquals(formattedMessage, expectedPropertyValue, propertyValue, modes);
}
/**
* Asserts that a property of all objects in the collection are equal to the given values.
*
* Example: assertPropertyEquals("id", myIdCollection, myObjectCollection) checks whether all values of the
* id field of the myObjectCollection elements matches the values in the myIdCollection
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* This is identical to assertPropertyReflectionEquals with
* lenient order and ignore defaults set as comparator modes.
*
* @param propertyName the property, not null
* @param expectedPropertyValues the expected values
* @param actualObjects the objects that contain the property
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyLenientEquals(String propertyName, Collection expectedPropertyValues, Collection actualObjects) throws AssertionFailedError {
assertPropertyLenientEquals(null, propertyName, expectedPropertyValues, actualObjects);
}
/**
* Asserts that a property of all objects in the collection are equal to the given values.
*
* Example: assertPropertyEquals("id", myIdCollection, myObjectCollection) checks whether all values of the
* id field of the myObjectCollection elements matches the values in the myIdCollection
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* The comparator modes determine how strict to compare the values.
*
* @param propertyName the property, not null
* @param expectedPropertyValues the expected values
* @param actualObjects the objects that contain the property
* @param modes the comparator modes
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyReflectionEquals(String propertyName, Collection expectedPropertyValues, Collection actualObjects, ReflectionComparatorMode... modes) throws AssertionFailedError {
assertPropertyReflectionEquals(null, propertyName, expectedPropertyValues, actualObjects, modes);
}
/**
* Asserts that a property of all objects in the collection are equal to the given values.
*
* Example: assertPropertyEquals("id", myIdCollection, myObjectCollection) checks whether all values of the
* id field of the myObjectCollection elements matches the values in the myIdCollection
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* This is identical to assertPropertyReflectionEquals with
* lenient order and ignore defaults set as comparator modes.
*
* @param message a message for when the assertion fails
* @param propertyName the property, not null
* @param expectedPropertyValues the expected values, not null
* @param actualObjects the objects that contain the property
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyLenientEquals(String message, String propertyName, Collection expectedPropertyValues, Collection actualObjects) throws AssertionFailedError {
assertPropertyReflectionEquals(message, propertyName, expectedPropertyValues, actualObjects, LENIENT_ORDER, IGNORE_DEFAULTS);
}
/**
* All fields are checked for null values (except the static ones).
* Private fields are also checked.
* This is NOT recursive, only the values of the first object will be checked.
* An assertion error will be thrown when a property is null.
*
* @param message a message for when the assertion fails
* @param object the object that will be checked for null values.
*/
public static void assertPropertiesNotNull(String message, Object object) {
Set fields = ReflectionUtils.getAllFields(object.getClass());
for (Field field : fields) {
if (!Modifier.isStatic(field.getModifiers())) {
String formattedMessage = formatMessage(message, "Property '" + field.getName() + "' in object '" + object.toString() + "' is null ");
assertNotNull(formattedMessage, ReflectionUtils.getFieldValue(object, field));
}
}
}
/**
* Asserts that a property of all objects in the collection are equal to the given values.
*
* Example: assertPropertyEquals("id", myIdCollection, myObjectCollection) checks whether all values of the
* id field of the myObjectCollection elements matches the values in the myIdCollection
*
* Bean notation can be used to specify inner properties. Eg myArray[2].innerValue.
* assertReflectionEquals is used to check whether both values are equal.
*
* The comparator modes determine how strict to compare the values.
*
* @param message a message for when the assertion fails
* @param propertyName the property, not null
* @param expectedPropertyValues the expected values, not null
* @param actualObjects the objects that contain the property
* @param modes the comparator modes
* @throws AssertionFailedError when both objects are not equals
*/
public static void assertPropertyReflectionEquals(String message, String propertyName, Collection expectedPropertyValues, Collection actualObjects, ReflectionComparatorMode... modes) throws AssertionFailedError {
assertNotNull("Actual object list is null.", actualObjects);
Collection actualPropertyValues = CollectionUtils.collect(actualObjects, new OgnlTransformer(propertyName));
assertReflectionEquals(message, expectedPropertyValues, actualPropertyValues, modes);
}
/**
* Formats the exception message.
*
* @param suppliedMessage the user supplied message
* @param specificMessage the reason
* @return the formatted message
*/
protected static String formatMessage(String suppliedMessage, String specificMessage) {
if (StringUtils.isEmpty(suppliedMessage)) {
return specificMessage;
}
return suppliedMessage + "\n" + specificMessage;
}
/**
* Evaluates the given OGNL expression, and returns the corresponding property value from the given object.
*
* @param object The object on which the expression is evaluated
* @param ognlExpression The OGNL expression that is evaluated
* @return The value for the given OGNL expression
*/
protected static Object getProperty(Object object, String ognlExpression) {
try {
OgnlContext ognlContext = new OgnlContext();
ognlContext.setMemberAccess(new DefaultMemberAccess(true));
Object ognlExprObj = Ognl.parseExpression(ognlExpression);
return Ognl.getValue(ognlExprObj, ognlContext, object);
} catch (OgnlException e) {
throw new UnitilsException("Failed to get property value using OGNL expression " + ognlExpression, e);
}
}
/**
* All fields that have a getter with the same name will be checked by an assertNotNull.
* Other fields will be ignored
*
* @param message
* @param object
*/
public static void assertAccessablePropertiesNotNull(String message, Object object) {
Set fields = ReflectionUtils.getAllFields(object.getClass());
for (Field field : fields) {
Method getter = ReflectionUtils.getGetter(object.getClass(), field.getName(), false);
if (getter != null) {
Object result = null;
try {
result = getter.invoke(object, ArrayUtils.EMPTY_OBJECT_ARRAY);
} catch (Exception e) {
throw new UnitilsException(e);
}
String formattedMessage = formatMessage(message, "Property '" + field.getName() + "' in object '" + object.toString() + "' is null ");
assertNotNull(formattedMessage, result);
}
}
}
/**
* A commons collections transformer that takes an object and returns the value of the property that is
* specified by the given ognl expression.
*/
protected static class OgnlTransformer implements Transformer {
/* The ognl expression */
private String ognlExpression;
/**
* Creates a transformer with the given ognl expression.
*
* @param ognlExpression The expression, not null
*/
public OgnlTransformer(String ognlExpression) {
this.ognlExpression = ognlExpression;
}
/**
* Transforms the given object in the value of the property that is specified by the ognl expression.
*
* @param object The object
* @return The value, null if object was null
*/
public Object transform(Object object) {
if (object == null) {
return null;
}
return getProperty(object, ognlExpression);
}
}
}
