java.beans
class PropertyDescriptor

java.lang.Object java.beans.FeatureDescriptor java.beans.PropertyDescriptor

Direct Known Subclasses:

IndexedPropertyDescriptor

Most common way to construct:

Class beanClass = …;

PropertyDescriptor textPD = new PropertyDescriptor("text", beanClass);

Based on 34 examples

public class PropertyDescriptor
extends FeatureDescriptor

A PropertyDescriptor describes one property that a Java Bean exports via a pair of accessor methods.

PropertyDescriptor

public PropertyDescriptor(String propertyName,
                          Class beanClass)
                   throws IntrospectionException

Constructs a PropertyDescriptor for a property that follows the standard Java convention by having getFoo and setFoo accessor methods. Thus if the argument name is "fred", it will assume that the writer method is "setFred" and the reader method is "getFred" (or "isFred" for a boolean property). Note that the property name should start with a lower case character, which will be capitalized in the method names.

Parameters:

propertyName - The programmatic name of the property.

beanClass - The Class object for the target bean. For example sun.beans.OurButton.class.

Throws:

IntrospectionException - if an exception occurs during introspection.

PropertyDescriptor

public PropertyDescriptor(String propertyName,
                          Class beanClass,
                          String readMethodName,
                          String writeMethodName)
                   throws IntrospectionException

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

Parameters:

propertyName - The programmatic name of the property.

beanClass - The Class object for the target bean. For example sun.beans.OurButton.class.

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

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

Throws:

IntrospectionException - if an exception occurs during introspection.

PropertyDescriptor

public PropertyDescriptor(String propertyName,
                          Method readMethod,
                          Method writeMethod)
                   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 value. May be null if the property is write-only.

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

Throws:

IntrospectionException - if an exception occurs during introspection.

createPropertyEditor

public PropertyEditor createPropertyEditor(Object bean)

Constructs an instance of a property editor using the current property editor class.

If the property editor class has a public constructor that takes an Object argument then it will be invoked using the bean parameter as the argument. Otherwise, the default constructor will be invoked.

Parameters:

bean - the source object

Returns:

a property editor instance or null if a property editor has not been defined or cannot be created

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 Object

Parameters:

obj

getPropertyEditorClass

public Class getPropertyEditorClass()

Gets any explicit PropertyEditor Class that has been registered for this property.

Returns:

Any explicit PropertyEditor Class that has been registered for this property. Normally this will return "null", indicating that no special editor has been registered, so the PropertyEditorManager should be used to locate a suitable PropertyEditor.

getPropertyType

public synchronized Class getPropertyType()

Gets the Class object for the property.

Returns:

The Java type info for the property. Note that the "Class" object may describe a built-in Java type such as "int". The result may be "null" if this is an indexed property that does not support non-indexed access.

This is the type that will be returned by the ReadMethod.

getReadMethod

public synchronized Method getReadMethod()

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

Returns:

The method that should be used to read the property value. May return null if the property can't be read.

getWriteMethod

public synchronized Method getWriteMethod()

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

Returns:

The method that should be used to write the property value. May return null if the property can't be written.

hashCode

public int hashCode()

Returns a hash code value for the object. See {@link java.lang.Object#hashCode} for a complete description.

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

isBound

public boolean isBound()

Updates to "bound" properties will cause a "PropertyChange" event to get fired when the property is changed.

Returns:

True if this is a bound property.

isConstrained

public boolean isConstrained()

Attempted updates to "Constrained" properties will cause a "VetoableChange" event to get fired when the property is changed.

Returns:

True if this is a constrained property.

setBound

public void setBound(boolean bound)

Updates to "bound" properties will cause a "PropertyChange" event to get fired when the property is changed.

Parameters:

bound - True if this is a bound property.

setConstrained

public void setConstrained(boolean constrained)

Attempted updates to "Constrained" properties will cause a "VetoableChange" event to get fired when the property is changed.

Parameters:

constrained - True if this is a constrained property.

setPropertyEditorClass

public void setPropertyEditorClass(Class propertyEditorClass)

Normally PropertyEditors will be found using the PropertyEditorManager. However if for some reason you want to associate a particular PropertyEditor with a given property, then you can do it with this method.

Parameters:

propertyEditorClass - The Class for the desired PropertyEditor.

setReadMethod

public synchronized void setReadMethod(Method readMethod)
                                throws IntrospectionException

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

Parameters:

readMethod - The new read method.

Throws:

IntrospectionException

setWriteMethod

public synchronized void setWriteMethod(Method writeMethod)
                                 throws IntrospectionException

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

Parameters:

writeMethod - The new write method.

Throws:

IntrospectionException