java.beans

Class IndexedPropertyDescriptor

java.lang.Object

java.beans.FeatureDescriptor

java.beans.PropertyDescriptor

java.beans.IndexedPropertyDescriptor

public class IndexedPropertyDescriptor
extends PropertyDescriptor

An IndexedPropertyDescriptor describes a property that acts like an array and has an indexed read and/or indexed write method to access specific elements of the array.

An indexed property may also provide simple non-indexed read and write methods. If these are present, they read and write arrays of the type returned by the indexed read method.

Constructor Summary

Constructors

Constructor and Description
IndexedPropertyDescriptor(String propertyName, Class<?> beanClass) This constructor constructs an IndexedPropertyDescriptor for a property that follows the standard Java conventions by having getFoo and setFoo accessor methods, for both indexed access and array access.
IndexedPropertyDescriptor(String propertyName, Class<?> beanClass, String readMethodName, String writeMethodName, String indexedReadMethodName, String indexedWriteMethodName) This constructor takes the name of a simple property, and method names for reading and writing the property, both indexed and non-indexed.
IndexedPropertyDescriptor(String propertyName, Method readMethod, Method writeMethod, Method indexedReadMethod, Method indexedWriteMethod) This constructor takes the name of a simple property, and Method objects for reading and writing the property.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj) Compares this PropertyDescriptor against the specified object.
Class<?>	getIndexedPropertyType() Returns the Java type info for the indexed property.
Method	getIndexedReadMethod() Gets the method that should be used to read an indexed property value.
Method	getIndexedWriteMethod() Gets the method that should be used to write an indexed property value.
int	hashCode() Returns a hash code value for the object.
void	setIndexedReadMethod(Method readMethod) Sets the method that should be used to read an indexed property value.
void	setIndexedWriteMethod(Method writeMethod) Sets the method that should be used to write an indexed property value.

Methods inherited from class java.beans.PropertyDescriptor

createPropertyEditor, getPropertyEditorClass, getPropertyType, getReadMethod, getWriteMethod, isBound, isConstrained, setBound, setConstrained, setPropertyEditorClass, setReadMethod, setWriteMethod

Methods inherited from class java.beans.FeatureDescriptor

attributeNames, getDisplayName, getName, getShortDescription, getValue, isExpert, isHidden, isPreferred, setDisplayName, setExpert, setHidden, setName, setPreferred, setShortDescription, setValue, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

IndexedPropertyDescriptor

public IndexedPropertyDescriptor(String propertyName,
                         Class<?> beanClass)
                          throws IntrospectionException

This constructor constructs an IndexedPropertyDescriptor for a property that follows the standard Java conventions by having getFoo and setFoo accessor methods, for both indexed access and array access.

Thus if the argument name is "fred", it will assume that there is an indexed reader method "getFred", a non-indexed (array) reader method also called "getFred", an indexed writer method "setFred", and finally a non-indexed writer method "setFred".

Parameters:

propertyName - The programmatic name of the property.

beanClass - The Class object for the target bean.

Throws:

IntrospectionException - if an exception occurs during introspection.

IndexedPropertyDescriptor

public IndexedPropertyDescriptor(String propertyName,
                         Class<?> beanClass,
                         String readMethodName,
                         String writeMethodName,
                         String indexedReadMethodName,
                         String indexedWriteMethodName)
                          throws IntrospectionException

This constructor takes the name of a simple property, and method names for reading and writing the property, both indexed and non-indexed.

Parameters:

propertyName - The programmatic name of the property.

beanClass - The Class object for the target bean.

readMethodName - The name of the method used for reading the property values as an array. May be null if the property is write-only or must be indexed.

writeMethodName - The name of the method used for writing the property values as an array. May be null if the property is read-only or must be indexed.

indexedReadMethodName - The name of the method used for reading an indexed property value. May be null if the property is write-only.

indexedWriteMethodName - The name of the method used for writing an indexed property value. May be null if the property is read-only.

Throws:

IntrospectionException - if an exception occurs during introspection.

IndexedPropertyDescriptor

public IndexedPropertyDescriptor(String propertyName,
                         Method readMethod,
                         Method writeMethod,
                         Method indexedReadMethod,
                         Method indexedWriteMethod)
                          throws IntrospectionException

This constructor takes the name of a simple property, and Method objects for reading and writing the property.

Parameters:

propertyName - The programmatic name of the property.

readMethod - The method used for reading the property values as an array. May be null if the property is write-only or must be indexed.

writeMethod - The method used for writing the property values as an array. May be null if the property is read-only or must be indexed.

indexedReadMethod - The method used for reading an indexed property value. May be null if the property is write-only.

indexedWriteMethod - The method used for writing an indexed property value. May be null if the property is read-only.

Throws:

IntrospectionException - if an exception occurs during introspection.

Method Detail

getIndexedReadMethod

public Method getIndexedReadMethod()

Gets the method that should be used to read an indexed property value.

Returns:

The method that should be used to read an indexed property value. May return null if the property isn't indexed or is write-only.

setIndexedReadMethod

public void setIndexedReadMethod(Method readMethod)
                          throws IntrospectionException

Sets the method that should be used to read an indexed property value.

Parameters:

readMethod - The new indexed read method.

Throws:

IntrospectionException

getIndexedWriteMethod

public Method getIndexedWriteMethod()

Gets the method that should be used to write an indexed property value.

Returns:

The method that should be used to write an indexed property value. May return null if the property isn't indexed or is read-only.

setIndexedWriteMethod

public void setIndexedWriteMethod(Method writeMethod)
                           throws IntrospectionException

Sets the method that should be used to write an indexed property value.

Parameters:

writeMethod - The new indexed write method.

Throws:

IntrospectionException

getIndexedPropertyType

public Class<?> getIndexedPropertyType()

Returns the Java type info for the indexed property. Note that the Class object may describe primitive Java types such as int. This type is returned by the indexed read method or is used as the parameter type of the indexed write method.

Returns:

the Class object that represents the Java type info, or null if the type cannot be determined

equals

public boolean equals(Object obj)

Compares this PropertyDescriptor against the specified object. Returns true if the objects are the same. Two PropertyDescriptors are the same if the read, write, property types, property editor and flags are equivalent.

Overrides:

equals in class PropertyDescriptor

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

Since:

1.4

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns a hash code value for the object. See Object.hashCode() for a complete description.

Overrides:

hashCode in class PropertyDescriptor

Returns:

a hash code value for this object.

Since:

1.5

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)