org.assertj.core.util.introspection

Class PropertySupport

java.lang.Object

org.assertj.core.util.introspection.PropertySupport

public class PropertySupport
extends Object

Utility methods for properties access.

Author:

Joel Costigliola, Alex Ruiz, Nicolas François, Florent Biville

Method Summary

Modifier and Type	Method and Description
static PropertySupport	instance() Returns the singleton instance of this class.
<T> T	propertyValue(String propertyName, Class<T> clazz, Object target) Return the value of a simple property from a target object.
<T> T	propertyValueOf(String propertyName, Class<T> clazz, Object target) Returns the value of the given property name given target.
static <T> T	propertyValueOf(String propertyName, Object target, Class<T> clazz) Static variant of propertyValueOf(String, Class, Object) for syntactic sugar.
<T> List<T>	propertyValues(String propertyName, Class<T> clazz, Iterable<?> target) Returns a List containing the values of the given property name, from the elements of the given Iterable.
List<Object>	propertyValues(String fieldOrPropertyName, Iterable<?> target) Returns a List containing the values of the given property name, from the elements of the given Iterable.
boolean	publicGetterExistsFor(String fieldName, Object actual)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

instance

public static PropertySupport instance()

Returns the singleton instance of this class.

Returns:

the singleton instance of this class.

propertyValues

public <T> List<T> propertyValues(String propertyName,
                                  Class<T> clazz,
                                  Iterable<?> target)

Returns a List containing the values of the given property name, from the elements of the given Iterable. If the given Iterable is empty or null, this method will return an empty List. This method supports nested properties (e.g. "address.street.number").

Type Parameters:

T - the type of the extracted elements.

Parameters:

propertyName - the name of the property. It may be a nested property. It is left to the clients to validate for null or empty.

clazz - type of property

target - the given Iterable.

Returns:

an Iterable containing the values of the given property name, from the elements of the given Iterable.

Throws:

IntrospectionError - if an element in the given Iterable does not have a property with a matching name.

propertyValueOf

public static <T> T propertyValueOf(String propertyName,
                                    Object target,
                                    Class<T> clazz)

Static variant of propertyValueOf(String, Class, Object) for syntactic sugar.

Type Parameters:

T - the type of the extracted elements.

Parameters:

propertyName - the name of the property. It may be a nested property. It is left to the clients to validate for null or empty.

target - the given object

clazz - type of property

Returns:

a the values of the given property name

Throws:

IntrospectionError - if the given target does not have a property with a matching name.

propertyValue

public <T> T propertyValue(String propertyName,
                           Class<T> clazz,
                           Object target)

Return the value of a simple property from a target object.

This only works for simple property, nested property are not supported ! use propertyValueOf(String, Class, Object)

Type Parameters:

T - the type of the extracted value.

Parameters:

propertyName - the name of the property. It may be a nested property. It is left to the clients to validate for null or empty.

target - the given object

clazz - type of property

Returns:

a the values of the given property name

Throws:

IntrospectionError - if the given target does not have a property with a matching name.

propertyValueOf

public <T> T propertyValueOf(String propertyName,
                             Class<T> clazz,
                             Object target)

Returns the value of the given property name given target. If the given object is null, this method will return null.
This method supports nested properties (e.g. "address.street.number").

Type Parameters:

T - the type of the extracted value.

Parameters:

propertyName - the name of the property. It may be a nested property. It is left to the clients to validate for null or empty.

clazz - the class of property.

target - the given Object to extract property from.

Returns:

the value of the given property name given target.

Throws:

IntrospectionError - if target object does not have a property with a matching name.

IllegalArgumentException - if propertyName is null.

propertyValues

public List<Object> propertyValues(String fieldOrPropertyName,
                                   Iterable<?> target)

Returns a List containing the values of the given property name, from the elements of the given Iterable. If the given Iterable is empty or null, this method will return an empty List. This method supports nested properties (e.g. "address.street.number").

Parameters:

fieldOrPropertyName - the name of the property. It may be a nested property. It is left to the clients to validate for null or empty.

target - the given Iterable.

Returns:

an Iterable containing the values of the given property name, from the elements of the given Iterable.

Throws:

IntrospectionError - if an element in the given Iterable does not have a property with a matching name.

publicGetterExistsFor

public boolean publicGetterExistsFor(String fieldName,
                                     Object actual)