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com.vaadin.util.
Class ReflectTools
- java.lang.Object
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- com.vaadin.util.ReflectTools
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All Implemented Interfaces:
public class ReflectTools extends Object implements SerializableAn util class with helpers for reflection operations. Used internally by Vaadin and should not be used by application developers. Subject to change at any time.
Since:
6.2
See Also:
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Constructor Summary
Constructors Constructor and Description ReflectTools()
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Method Summary
All Methods Modifier and Type Method and Description static Class<?>convertPrimitiveType(Class<?> type)static MethodfindMethod(Class<?> cls, String methodName, Class<?>... parameterTypes)Locates the method in the given class.
static ObjectgetJavaFieldValue(Object object, Field field)Returns the value of the java field.
static ObjectgetJavaFieldValue(Object object, Field field, Class<?> propertyType)Returns the value of the java field that is assignable to the property type.
static voidsetJavaFieldValue(Object object, Field field, Object value)Sets the value of a java field.
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Method Detail
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findMethod
public static Method findMethod(Class<?> cls, String methodName, Class<?>... parameterTypes) throws ExceptionInInitializerErrorLocates the method in the given class. Returns null if the method is not found. Throws an ExceptionInInitializerError if there is a problem locating the method as this is mainly called from static blocks.
Parameters:
cls- Class that contains the methodmethodName- The name of the methodparameterTypes- The parameter types for the method.Returns:
A reference to the method
Throws:
ExceptionInInitializerError- Wraps any exception in anExceptionInInitializerErrorso this method can be called from a static initializer.
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getJavaFieldValue
public static Object getJavaFieldValue(Object object, Field field) throws IllegalArgumentException, IllegalAccessException, InvocationTargetExceptionReturns the value of the java field.
Uses getter if present, otherwise tries to access even private fields directly.
Parameters:
object- The object containing the fieldfield- The field we want to get the value forReturns:
The value of the field in the object
Throws:
InvocationTargetException- If the value could not be retrievedIllegalAccessException- If the value could not be retrievedIllegalArgumentException- If the value could not be retrieved
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getJavaFieldValue
public static Object getJavaFieldValue(Object object, Field field, Class<?> propertyType) throws IllegalArgumentException, IllegalAccessException, InvocationTargetExceptionReturns the value of the java field that is assignable to the property type.
Uses getter if a getter for the correct return type is present, otherwise tries to access even private fields directly. If the java field is not assignable to the property type throws an IllegalArgumentException.
Parameters:
object- The object containing the fieldfield- The field we want to get the value forpropertyType- The type the field must be assignable toReturns:
The value of the field in the object
Throws:
InvocationTargetException- If the value could not be retrievedIllegalAccessException- If the value could not be retrievedIllegalArgumentException- If the value could not be retrieved
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setJavaFieldValue
public static void setJavaFieldValue(Object object, Field field, Object value) throws IllegalAccessException, IllegalArgumentException, InvocationTargetExceptionSets the value of a java field.
Uses setter if present, otherwise tries to access even private fields directly.
Parameters:
object- The object containing the fieldfield- The field we want to set the value forvalue- The value to setThrows:
IllegalAccessException- If the value could not be assigned to the fieldIllegalArgumentException- If the value could not be assigned to the fieldInvocationTargetException- If the value could not be assigned to the field
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