Package org.apache.commons.beanutils

## Class PropertyUtilsBean

- java.lang.Object
- - org.apache.commons.beanutils.PropertyUtilsBean

    public class PropertyUtilsBean
    extends java.lang.Object

Utility methods for using Java Reflection APIs to facilitate generic property getter and setter operations on Java objects. Much of this code was originally included in `BeanUtils`, but has been separated because of the volume of code involved.

In general, the objects that are examined and modified using these methods are expected to conform to the property getter and setter method naming conventions described in the JavaBeans Specification (Version 1.0.1). No data type conversions are performed, and there are no usage of any `PropertyEditor` classes that have been registered, although a convenient way to access the registered classes themselves is included.

For the purposes of this class, five formats for referencing a particular property value of a bean are defined, with the default layout of an identifying String in parentheses. However the notation for these formats and how they are resolved is now (since BeanUtils 1.8.0) controlled by the configured `Resolver` implementation:

- Simple (`name`) - The specified `name` identifies an individual property of a particular JavaBean. The name of the actual getter or setter method to be used is determined using standard JavaBeans instrospection, so that (unless overridden by a `BeanInfo` class, a property named "xyz" will have a getter method named `getXyz()` or (for boolean properties only) `isXyz()`, and a setter method named `setXyz()`.
- Nested (`name1.name2.name3`) The first name element is used to select a property getter, as for simple references above. The object returned for this property is then consulted, using the same approach, for a property getter for a property named `name2`, and so on. The property value that is ultimately retrieved or modified is the one identified by the last name element.
- Indexed (`name[index]`) - The underlying property value is assumed to be an array, or this JavaBean is assumed to have indexed property getter and setter methods. The appropriate (zero-relative) entry in the array is selected. `List` objects are now also supported for read/write. You simply need to define a getter that returns the `List`
- Mapped (`name(key)`) - The JavaBean is assumed to have an property getter and setter methods with an additional attribute of type `java.lang.String`.
- Combined (`name1.name2[index].name3(key)`) - Combining mapped, nested, and indexed references is also supported.

Since:
  1.7
Version:
  $Id$
See Also:
  `Resolver`, `PropertyUtils`

### Constructor Summary

Constructors
`PropertyUtilsBean()` Base constructor

### Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
`void` `addBeanIntrospector​(BeanIntrospector introspector)` Adds a `BeanIntrospector`.
`void` `clearDescriptors()` Clear any cached property descriptors information for all classes loaded by any class loaders.
`void` `copyProperties​(java.lang.Object dest, java.lang.Object orig)` Copy property values from the "origin" bean to the "destination" bean for all cases where the property names are the same (even though the actual getter and setter methods might have been customized via `BeanInfo` classes).
`java.util.Map<java.lang.String,​java.lang.Object>` `describe​(java.lang.Object bean)` Return the entire set of properties for which the specified bean provides a read method.
`java.lang.Object` `getIndexedProperty​(java.lang.Object bean, java.lang.String name)` Return the value of the specified indexed property of the specified bean, with no type conversions.
`java.lang.Object` `getIndexedProperty​(java.lang.Object bean, java.lang.String name, int index)` Return the value of the specified indexed property of the specified bean, with no type conversions.
`protected static PropertyUtilsBean` `getInstance()` Return the PropertyUtils bean instance.
`java.lang.Object` `getMappedProperty​(java.lang.Object bean, java.lang.String name)` Return the value of the specified mapped property of the specified bean, with no type conversions.
`java.lang.Object` `getMappedProperty​(java.lang.Object bean, java.lang.String name, java.lang.String key)` Return the value of the specified mapped property of the specified bean, with no type conversions.
`org.apache.commons.collections.FastHashMap` `getMappedPropertyDescriptors​(java.lang.Class<?> beanClass)` Deprecated. This method should not be exposed
`org.apache.commons.collections.FastHashMap` `getMappedPropertyDescriptors​(java.lang.Object bean)` Deprecated. This method should not be exposed
`java.lang.Object` `getNestedProperty​(java.lang.Object bean, java.lang.String name)` Return the value of the (possibly nested) property of the specified name, for the specified bean, with no type conversions.
`java.lang.Object` `getProperty​(java.lang.Object bean, java.lang.String name)` Return the value of the specified property of the specified bean, no matter which property reference format is used, with no type conversions.
`java.beans.PropertyDescriptor` `getPropertyDescriptor​(java.lang.Object bean, java.lang.String name)` Retrieve the property descriptor for the specified property of the specified bean, or return `null` if there is no such descriptor.
`java.beans.PropertyDescriptor[]` `getPropertyDescriptors​(java.lang.Class<?> beanClass)` Retrieve the property descriptors for the specified class, introspecting and caching them the first time a particular bean class is encountered.
`java.beans.PropertyDescriptor[]` `getPropertyDescriptors​(java.lang.Object bean)` Retrieve the property descriptors for the specified bean, introspecting and caching them the first time a particular bean class is encountered.
`java.lang.Class<?>` `getPropertyEditorClass​(java.lang.Object bean, java.lang.String name)` Return the Java Class repesenting the property editor class that has been registered for this property (if any).
`protected java.lang.Object` `getPropertyOfMapBean​(java.util.Map<?,​?> bean, java.lang.String propertyName)` This method is called by getNestedProperty and setNestedProperty to define what it means to get a property from an object which implements Map.
`java.lang.Class<?>` `getPropertyType​(java.lang.Object bean, java.lang.String name)` Return the Java Class representing the property type of the specified property, or `null` if there is no such property for the specified bean.
`java.lang.reflect.Method` `getReadMethod​(java.beans.PropertyDescriptor descriptor)` Return an accessible property getter method for this property, if there is one; otherwise return `null`.
`Resolver` `getResolver()` Return the configured `Resolver` implementation used by BeanUtils.
`java.lang.Object` `getSimpleProperty​(java.lang.Object bean, java.lang.String name)` Return the value of the specified simple property of the specified bean, with no type conversions.
`java.lang.reflect.Method` `getWriteMethod​(java.beans.PropertyDescriptor descriptor)` Return an accessible property setter method for this property, if there is one; otherwise return `null`.
`java.lang.reflect.Method` `getWriteMethod​(java.lang.Class<?> clazz, java.beans.PropertyDescriptor descriptor)` Return an accessible property setter method for this property, if there is one; otherwise return `null`.
`boolean` `isReadable​(java.lang.Object bean, java.lang.String name)` Return `true` if the specified property name identifies a readable property on the specified bean; otherwise, return `false`.
`boolean` `isWriteable​(java.lang.Object bean, java.lang.String name)` Return `true` if the specified property name identifies a writeable property on the specified bean; otherwise, return `false`.
`boolean` `removeBeanIntrospector​(BeanIntrospector introspector)` Removes the specified `BeanIntrospector`.
`void` `resetBeanIntrospectors()` Resets the `BeanIntrospector` objects registered at this instance.
`void` `setIndexedProperty​(java.lang.Object bean, java.lang.String name, int index, java.lang.Object value)` Set the value of the specified indexed property of the specified bean, with no type conversions.
`void` `setIndexedProperty​(java.lang.Object bean, java.lang.String name, java.lang.Object value)` Set the value of the specified indexed property of the specified bean, with no type conversions.
`void` `setMappedProperty​(java.lang.Object bean, java.lang.String name, java.lang.Object value)` Set the value of the specified mapped property of the specified bean, with no type conversions.
`void` `setMappedProperty​(java.lang.Object bean, java.lang.String name, java.lang.String key, java.lang.Object value)` Set the value of the specified mapped property of the specified bean, with no type conversions.
`void` `setNestedProperty​(java.lang.Object bean, java.lang.String name, java.lang.Object value)` Set the value of the (possibly nested) property of the specified name, for the specified bean, with no type conversions.
`void` `setProperty​(java.lang.Object bean, java.lang.String name, java.lang.Object value)` Set the value of the specified property of the specified bean, no matter which property reference format is used, with no type conversions.
`protected void` `setPropertyOfMapBean​(java.util.Map<java.lang.String,​java.lang.Object> bean, java.lang.String propertyName, java.lang.Object value)` This method is called by method setNestedProperty when the current bean is found to be a Map object, and defines how to deal with setting a property on a Map.
`void` `setResolver​(Resolver resolver)` Configure the `Resolver` implementation used by BeanUtils.
`void` `setSimpleProperty​(java.lang.Object bean, java.lang.String name, java.lang.Object value)` Set the value of the specified simple property of the specified bean, with no type conversions.

### Methods inherited from class java.lang.Object

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

### Constructor Detail

#### PropertyUtilsBean

    public PropertyUtilsBean()

Base constructor

### Method Detail

#### getInstance

    protected static PropertyUtilsBean getInstance()

Return the PropertyUtils bean instance.

Returns:
  The PropertyUtils bean instance

#### getResolver

    public Resolver getResolver()

Return the configured `Resolver` implementation used by BeanUtils.

The `Resolver` handles the property name expressions and the implementation in use effectively controls the dialect of the expression language that BeanUtils recongnises.

`DefaultResolver` is the default implementation used.

Returns:
  resolver The property expression resolver.
Since:
  1.8.0

#### setResolver

    public void setResolver​(Resolver resolver)

Configure the `Resolver` implementation used by BeanUtils.

The `Resolver` handles the property name expressions and the implementation in use effectively controls the dialect of the expression language that BeanUtils recongnises.

`DefaultResolver` is the default implementation used.

Parameters:
  `resolver` - The property expression resolver.
Since:
  1.8.0

#### resetBeanIntrospectors

    public final void resetBeanIntrospectors()

Resets the `BeanIntrospector` objects registered at this instance. After this method was called, only the default `BeanIntrospector` is registered.

Since:
  1.9

#### addBeanIntrospector

    public void addBeanIntrospector​(BeanIntrospector introspector)

Adds a `BeanIntrospector`. This object is invoked when the property descriptors of a class need to be obtained.

Parameters:
  `introspector` - the `BeanIntrospector` to be added (must not be null
Throws:
  `java.lang.IllegalArgumentException` - if the argument is null
Since:
  1.9

#### removeBeanIntrospector

    public boolean removeBeanIntrospector​(BeanIntrospector introspector)

Removes the specified `BeanIntrospector`.

Parameters:
  `introspector` - the `BeanIntrospector` to be removed
Returns:
  true if the `BeanIntrospector` existed and could be removed, false otherwise
Since:
  1.9

#### clearDescriptors

    public void clearDescriptors()

Clear any cached property descriptors information for all classes loaded by any class loaders. This is useful in cases where class loaders are thrown away to implement class reloading.

#### copyProperties

    public void copyProperties​(java.lang.Object dest,
                               java.lang.Object orig)
                        throws java.lang.IllegalAccessException,
                               java.lang.reflect.InvocationTargetException,
                               java.lang.NoSuchMethodException

Copy property values from the "origin" bean to the "destination" bean for all cases where the property names are the same (even though the actual getter and setter methods might have been customized via `BeanInfo` classes). No conversions are performed on the actual property values -- it is assumed that the values retrieved from the origin bean are assignment-compatible with the types expected by the destination bean.

If the origin "bean" is actually a `Map`, it is assumed to contain String-valued simple property names as the keys, pointing at the corresponding property values that will be set in the destination bean.Note that this method is intended to perform a "shallow copy" of the properties and so complex properties (for example, nested ones) will not be copied.

Note, that this method will not copy a List to a List, or an Object[] to an Object[]. It's specifically for copying JavaBean properties.

Parameters:
  `dest` - Destination bean whose properties are modified
  `orig` - Origin bean whose properties are retrieved
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if the `dest` or `orig` argument is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### describe

    public java.util.Map<java.lang.String,​java.lang.Object> describe​(java.lang.Object bean)
                                                                    throws java.lang.IllegalAccessException,
                                                                           java.lang.reflect.InvocationTargetException,
                                                                           java.lang.NoSuchMethodException

Return the entire set of properties for which the specified bean provides a read method. This map contains the unconverted property values for all properties for which a read method is provided (i.e. where the `getReadMethod()` returns non-null).

FIXME - Does not account for mapped properties.

Parameters:
  `bean` - Bean whose properties are to be extracted
Returns:
  The set of properties for the bean
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getIndexedProperty

    public java.lang.Object getIndexedProperty​(java.lang.Object bean,
                                               java.lang.String name)
                                        throws java.lang.IllegalAccessException,
                                               java.lang.reflect.InvocationTargetException,
                                               java.lang.NoSuchMethodException

Return the value of the specified indexed property of the specified bean, with no type conversions. The zero-relative index of the required value must be included (in square brackets) as a suffix to the property name, or `IllegalArgumentException` will be thrown. In addition to supporting the JavaBeans specification, this method has been extended to support `List` objects as well.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - `propertyname[index]` of the property value to be extracted
Returns:
  the indexed property value
Throws:
  `java.lang.IndexOutOfBoundsException` - if the specified index is outside the valid range for the underlying array or List
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getIndexedProperty

    public java.lang.Object getIndexedProperty​(java.lang.Object bean,
                                               java.lang.String name,
                                               int index)
                                        throws java.lang.IllegalAccessException,
                                               java.lang.reflect.InvocationTargetException,
                                               java.lang.NoSuchMethodException

Return the value of the specified indexed property of the specified bean, with no type conversions. In addition to supporting the JavaBeans specification, this method has been extended to support `List` objects as well.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - Simple property name of the property value to be extracted
  `index` - Index of the property value to be extracted
Returns:
  the indexed property value
Throws:
  `java.lang.IndexOutOfBoundsException` - if the specified index is outside the valid range for the underlying property
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getMappedProperty

    public java.lang.Object getMappedProperty​(java.lang.Object bean,
                                              java.lang.String name)
                                       throws java.lang.IllegalAccessException,
                                              java.lang.reflect.InvocationTargetException,
                                              java.lang.NoSuchMethodException

Return the value of the specified mapped property of the specified bean, with no type conversions. The key of the required value must be included (in brackets) as a suffix to the property name, or `IllegalArgumentException` will be thrown.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - `propertyname(key)` of the property value to be extracted
Returns:
  the mapped property value
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getMappedProperty

    public java.lang.Object getMappedProperty​(java.lang.Object bean,
                                              java.lang.String name,
                                              java.lang.String key)
                                       throws java.lang.IllegalAccessException,
                                              java.lang.reflect.InvocationTargetException,
                                              java.lang.NoSuchMethodException

Return the value of the specified mapped property of the specified bean, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - Mapped property name of the property value to be extracted
  `key` - Key of the property value to be extracted
Returns:
  the mapped property value
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getMappedPropertyDescriptors

    @Deprecated
    public org.apache.commons.collections.FastHashMap getMappedPropertyDescriptors​(java.lang.Class<?> beanClass)

Deprecated.
This method should not be exposed

Return the mapped property descriptors for this bean class.

FIXME - Does not work with DynaBeans.

Parameters:
  `beanClass` - Bean class to be introspected
Returns:
  the mapped property descriptors

#### getMappedPropertyDescriptors

    @Deprecated
    public org.apache.commons.collections.FastHashMap getMappedPropertyDescriptors​(java.lang.Object bean)

Deprecated.
This method should not be exposed

Return the mapped property descriptors for this bean.

FIXME - Does not work with DynaBeans.

Parameters:
  `bean` - Bean to be introspected
Returns:
  the mapped property descriptors

#### getNestedProperty

    public java.lang.Object getNestedProperty​(java.lang.Object bean,
                                              java.lang.String name)
                                       throws java.lang.IllegalAccessException,
                                              java.lang.reflect.InvocationTargetException,
                                              java.lang.NoSuchMethodException

Return the value of the (possibly nested) property of the specified name, for the specified bean, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - Possibly nested name of the property to be extracted
Returns:
  the nested property value
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `NestedNullException` - if a nested reference to a property returns null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getPropertyOfMapBean

    protected java.lang.Object getPropertyOfMapBean​(java.util.Map<?,​?> bean,
                                                    java.lang.String propertyName)
                                             throws java.lang.IllegalArgumentException,
                                                    java.lang.IllegalAccessException,
                                                    java.lang.reflect.InvocationTargetException,
                                                    java.lang.NoSuchMethodException

This method is called by getNestedProperty and setNestedProperty to define what it means to get a property from an object which implements Map. See setPropertyOfMapBean for more information.

Parameters:
  `bean` - Map bean
  `propertyName` - The property name
Returns:
  the property value
Throws:
  `java.lang.IllegalArgumentException` - when the propertyName is regarded as being invalid.
  `java.lang.IllegalAccessException` - just in case subclasses override this method to try to access real getter methods and find permission is denied.
  `java.lang.reflect.InvocationTargetException` - just in case subclasses override this method to try to access real getter methods, and find it throws an exception when invoked.
  `java.lang.NoSuchMethodException` - just in case subclasses override this method to try to access real getter methods, and want to fail if no simple method is available.
Since:
  1.8.0

#### getProperty

    public java.lang.Object getProperty​(java.lang.Object bean,
                                        java.lang.String name)
                                 throws java.lang.IllegalAccessException,
                                        java.lang.reflect.InvocationTargetException,
                                        java.lang.NoSuchMethodException

Return the value of the specified property of the specified bean, no matter which property reference format is used, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - Possibly indexed and/or nested name of the property to be extracted
Returns:
  the property value
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getPropertyDescriptor

    public java.beans.PropertyDescriptor getPropertyDescriptor​(java.lang.Object bean,
                                                               java.lang.String name)
                                                        throws java.lang.IllegalAccessException,
                                                               java.lang.reflect.InvocationTargetException,
                                                               java.lang.NoSuchMethodException

Retrieve the property descriptor for the specified property of the specified bean, or return `null` if there is no such descriptor. This method resolves indexed and nested property references in the same manner as other methods in this class, except that if the last (or only) name element is indexed, the descriptor for the last resolved property itself is returned.

FIXME - Does not work with DynaBeans.

Note that for Java 8 and above, this method no longer return IndexedPropertyDescriptor for `List`-typed properties, only for properties typed as native array. (BEANUTILS-492).

Parameters:
  `bean` - Bean for which a property descriptor is requested
  `name` - Possibly indexed and/or nested name of the property for which a property descriptor is requested
Returns:
  the property descriptor
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.IllegalArgumentException` - if a nested reference to a property returns null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getPropertyDescriptors

    public java.beans.PropertyDescriptor[] getPropertyDescriptors​(java.lang.Class<?> beanClass)

Retrieve the property descriptors for the specified class, introspecting and caching them the first time a particular bean class is encountered.

FIXME - Does not work with DynaBeans.

Parameters:
  `beanClass` - Bean class for which property descriptors are requested
Returns:
  the property descriptors
Throws:
  `java.lang.IllegalArgumentException` - if `beanClass` is null

#### getPropertyDescriptors

    public java.beans.PropertyDescriptor[] getPropertyDescriptors​(java.lang.Object bean)

Retrieve the property descriptors for the specified bean, introspecting and caching them the first time a particular bean class is encountered.

FIXME - Does not work with DynaBeans.

Parameters:
  `bean` - Bean for which property descriptors are requested
Returns:
  the property descriptors
Throws:
  `java.lang.IllegalArgumentException` - if `bean` is null

#### getPropertyEditorClass

    public java.lang.Class<?> getPropertyEditorClass​(java.lang.Object bean,
                                                     java.lang.String name)
                                              throws java.lang.IllegalAccessException,
                                                     java.lang.reflect.InvocationTargetException,
                                                     java.lang.NoSuchMethodException

Return the Java Class repesenting the property editor class that has been registered for this property (if any). This method follows the same name resolution rules used by `getPropertyDescriptor()`, so if the last element of a name reference is indexed, the property editor for the underlying property's class is returned.

Note that `null` will be returned if there is no property, or if there is no registered property editor class. Because this return value is ambiguous, you should determine the existence of the property itself by other means.

FIXME - Does not work with DynaBeans.

Parameters:
  `bean` - Bean for which a property descriptor is requested
  `name` - Possibly indexed and/or nested name of the property for which a property descriptor is requested
Returns:
  the property editor class
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.IllegalArgumentException` - if a nested reference to a property returns null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getPropertyType

    public java.lang.Class<?> getPropertyType​(java.lang.Object bean,
                                              java.lang.String name)
                                       throws java.lang.IllegalAccessException,
                                              java.lang.reflect.InvocationTargetException,
                                              java.lang.NoSuchMethodException

Return the Java Class representing the property type of the specified property, or `null` if there is no such property for the specified bean. This method follows the same name resolution rules used by `getPropertyDescriptor()`, so if the last element of a name reference is indexed, the type of the property itself will be returned. If the last (or only) element has no property with the specified name, `null` is returned.

If the property is an indexed property (e.g. `String[]`), this method will return the type of the items within that array. Note that from Java 8 and newer, this method do not support such index types from items within an Collection, and will instead return the collection type (e.g. java.util.List) from the getter mtethod.

Parameters:
  `bean` - Bean for which a property descriptor is requested
  `name` - Possibly indexed and/or nested name of the property for which a property descriptor is requested
Returns:
  The property type
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.IllegalArgumentException` - if a nested reference to a property returns null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getReadMethod

    public java.lang.reflect.Method getReadMethod​(java.beans.PropertyDescriptor descriptor)

Return an accessible property getter method for this property, if there is one; otherwise return `null`.

FIXME - Does not work with DynaBeans.

Parameters:
  `descriptor` - Property descriptor to return a getter for
Returns:
  The read method

#### getSimpleProperty

    public java.lang.Object getSimpleProperty​(java.lang.Object bean,
                                              java.lang.String name)
                                       throws java.lang.IllegalAccessException,
                                              java.lang.reflect.InvocationTargetException,
                                              java.lang.NoSuchMethodException

Return the value of the specified simple property of the specified bean, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be extracted
  `name` - Name of the property to be extracted
Returns:
  The property value
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.IllegalArgumentException` - if the property name is nested or indexed
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### getWriteMethod

    public java.lang.reflect.Method getWriteMethod​(java.beans.PropertyDescriptor descriptor)

Return an accessible property setter method for this property, if there is one; otherwise return `null`.

Note: This method does not work correctly with custom bean introspection under certain circumstances. It may return `null` even if a write method is defined for the property in question. Use `getWriteMethod(Class, PropertyDescriptor)` to be sure that the correct result is returned.

FIXME - Does not work with DynaBeans.

Parameters:
  `descriptor` - Property descriptor to return a setter for
Returns:
  The write method

#### getWriteMethod

    public java.lang.reflect.Method getWriteMethod​(java.lang.Class<?> clazz,
                                                   java.beans.PropertyDescriptor descriptor)

Return an accessible property setter method for this property, if there is one; otherwise return `null`.

FIXME - Does not work with DynaBeans.

Parameters:
  `clazz` - The class of the read method will be invoked on
  `descriptor` - Property descriptor to return a setter for
Returns:
  The write method
Since:
  1.9.1

#### isReadable

    public boolean isReadable​(java.lang.Object bean,
                              java.lang.String name)

Return `true` if the specified property name identifies a readable property on the specified bean; otherwise, return `false`.

Parameters:
  `bean` - Bean to be examined (may be a `DynaBean`
  `name` - Property name to be evaluated
Returns:
  `true` if the property is readable, otherwise `false`
Throws:
  `java.lang.IllegalArgumentException` - if `bean` or `name` is `null`
Since:
  BeanUtils 1.6

#### isWriteable

    public boolean isWriteable​(java.lang.Object bean,
                               java.lang.String name)

Return `true` if the specified property name identifies a writeable property on the specified bean; otherwise, return `false`.

Parameters:
  `bean` - Bean to be examined (may be a `DynaBean`
  `name` - Property name to be evaluated
Returns:
  `true` if the property is writeable, otherwise `false`
Throws:
  `java.lang.IllegalArgumentException` - if `bean` or `name` is `null`
Since:
  BeanUtils 1.6

#### setIndexedProperty

    public void setIndexedProperty​(java.lang.Object bean,
                                   java.lang.String name,
                                   java.lang.Object value)
                            throws java.lang.IllegalAccessException,
                                   java.lang.reflect.InvocationTargetException,
                                   java.lang.NoSuchMethodException

Set the value of the specified indexed property of the specified bean, with no type conversions. The zero-relative index of the required value must be included (in square brackets) as a suffix to the property name, or `IllegalArgumentException` will be thrown. In addition to supporting the JavaBeans specification, this method has been extended to support `List` objects as well.

Parameters:
  `bean` - Bean whose property is to be modified
  `name` - `propertyname[index]` of the property value to be modified
  `value` - Value to which the specified property element should be set
Throws:
  `java.lang.IndexOutOfBoundsException` - if the specified index is outside the valid range for the underlying property
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### setIndexedProperty

    public void setIndexedProperty​(java.lang.Object bean,
                                   java.lang.String name,
                                   int index,
                                   java.lang.Object value)
                            throws java.lang.IllegalAccessException,
                                   java.lang.reflect.InvocationTargetException,
                                   java.lang.NoSuchMethodException

Set the value of the specified indexed property of the specified bean, with no type conversions. In addition to supporting the JavaBeans specification, this method has been extended to support `List` objects as well.

Parameters:
  `bean` - Bean whose property is to be set
  `name` - Simple property name of the property value to be set
  `index` - Index of the property value to be set
  `value` - Value to which the indexed property element is to be set
Throws:
  `java.lang.IndexOutOfBoundsException` - if the specified index is outside the valid range for the underlying property
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### setMappedProperty

    public void setMappedProperty​(java.lang.Object bean,
                                  java.lang.String name,
                                  java.lang.Object value)
                           throws java.lang.IllegalAccessException,
                                  java.lang.reflect.InvocationTargetException,
                                  java.lang.NoSuchMethodException

Set the value of the specified mapped property of the specified bean, with no type conversions. The key of the value to set must be included (in brackets) as a suffix to the property name, or `IllegalArgumentException` will be thrown.

Parameters:
  `bean` - Bean whose property is to be set
  `name` - `propertyname(key)` of the property value to be set
  `value` - The property value to be set
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### setMappedProperty

    public void setMappedProperty​(java.lang.Object bean,
                                  java.lang.String name,
                                  java.lang.String key,
                                  java.lang.Object value)
                           throws java.lang.IllegalAccessException,
                                  java.lang.reflect.InvocationTargetException,
                                  java.lang.NoSuchMethodException

Set the value of the specified mapped property of the specified bean, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be set
  `name` - Mapped property name of the property value to be set
  `key` - Key of the property value to be set
  `value` - The property value to be set
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### setNestedProperty

    public void setNestedProperty​(java.lang.Object bean,
                                  java.lang.String name,
                                  java.lang.Object value)
                           throws java.lang.IllegalAccessException,
                                  java.lang.reflect.InvocationTargetException,
                                  java.lang.NoSuchMethodException

Set the value of the (possibly nested) property of the specified name, for the specified bean, with no type conversions.

Example values for parameter "name" are:

- "a" -- sets the value of property a of the specified bean
- "a.b" -- gets the value of property a of the specified bean, then on that object sets the value of property b.
- "a(key)" -- sets a value of mapped-property a on the specified bean. This effectively means bean.setA("key").
- "a[3]" -- sets a value of indexed-property a on the specified bean. This effectively means bean.setA(3).

Parameters:
  `bean` - Bean whose property is to be modified
  `name` - Possibly nested name of the property to be modified
  `value` - Value to which the property is to be set
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.IllegalArgumentException` - if a nested reference to a property returns null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### setPropertyOfMapBean

    protected void setPropertyOfMapBean​(java.util.Map<java.lang.String,​java.lang.Object> bean,
                                        java.lang.String propertyName,
                                        java.lang.Object value)
                                 throws java.lang.IllegalArgumentException,
                                        java.lang.IllegalAccessException,
                                        java.lang.reflect.InvocationTargetException,
                                        java.lang.NoSuchMethodException

This method is called by method setNestedProperty when the current bean is found to be a Map object, and defines how to deal with setting a property on a Map.

The standard implementation here is to:

- call bean.set(propertyName) for all propertyName values.
- throw an IllegalArgumentException if the property specifier contains MAPPED_DELIM or INDEXED_DELIM, as Map entries are essentially simple properties; mapping and indexing operations do not make sense when accessing a map (even thought the returned object may be a Map or an Array).

The default behaviour of beanutils 1.7.1 or later is for assigning to "a.b" to mean a.put(b, obj) always. However the behaviour of beanutils version 1.6.0, 1.6.1, 1.7.0 was for "a.b" to mean a.setB(obj) if such a method existed, and a.put(b, obj) otherwise. In version 1.5 it meant a.put(b, obj) always (ie the same as the behaviour in the current version). In versions prior to 1.5 it meant a.setB(obj) always. [yes, this is all very unfortunate]

Users who would like to customise the meaning of "a.b" in method setNestedProperty when a is a Map can create a custom subclass of this class and override this method to implement the behaviour of their choice, such as restoring the pre-1.4 behaviour of this class if they wish. When overriding this method, do not forget to deal with MAPPED_DELIM and INDEXED_DELIM characters in the propertyName.

Note, however, that the recommended solution for objects that implement Map but want their simple properties to come first is for those objects to override their get/put methods to implement that behaviour, and not to solve the problem by modifying the default behaviour of the PropertyUtilsBean class by overriding this method.

Parameters:
  `bean` - Map bean
  `propertyName` - The property name
  `value` - the property value
Throws:
  `java.lang.IllegalArgumentException` - when the propertyName is regarded as being invalid.
  `java.lang.IllegalAccessException` - just in case subclasses override this method to try to access real setter methods and find permission is denied.
  `java.lang.reflect.InvocationTargetException` - just in case subclasses override this method to try to access real setter methods, and find it throws an exception when invoked.
  `java.lang.NoSuchMethodException` - just in case subclasses override this method to try to access real setter methods, and want to fail if no simple method is available.
Since:
  1.8.0

#### setProperty

    public void setProperty​(java.lang.Object bean,
                            java.lang.String name,
                            java.lang.Object value)
                     throws java.lang.IllegalAccessException,
                            java.lang.reflect.InvocationTargetException,
                            java.lang.NoSuchMethodException

Set the value of the specified property of the specified bean, no matter which property reference format is used, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be modified
  `name` - Possibly indexed and/or nested name of the property to be modified
  `value` - Value to which this property is to be set
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found

#### setSimpleProperty

    public void setSimpleProperty​(java.lang.Object bean,
                                  java.lang.String name,
                                  java.lang.Object value)
                           throws java.lang.IllegalAccessException,
                                  java.lang.reflect.InvocationTargetException,
                                  java.lang.NoSuchMethodException

Set the value of the specified simple property of the specified bean, with no type conversions.

Parameters:
  `bean` - Bean whose property is to be modified
  `name` - Name of the property to be modified
  `value` - Value to which the property should be set
Throws:
  `java.lang.IllegalAccessException` - if the caller does not have access to the property accessor method
  `java.lang.IllegalArgumentException` - if `bean` or `name` is null
  `java.lang.IllegalArgumentException` - if the property name is nested or indexed
  `java.lang.reflect.InvocationTargetException` - if the property accessor method throws an exception
  `java.lang.NoSuchMethodException` - if an accessor method for this propety cannot be found