package net.ms.designer.core;
import java.beans.BeanInfo;
import java.beans.IndexedPropertyDescriptor;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.*;
/**
* 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 <code>BeanUtils</code>, but has been
* separated because of the volume of code involved.
* <p>
* 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
* <code>PropertyEditor</code> classes that have been registered, although
* a convenient way to access the registered classes themselves is included.
* <p>
* For the purposes of this class, three formats for referencing a particular
* property value of a bean are defined, with the layout of an identifying
* String in parentheses:
* <ul>
* <li><strong>Simple (<code>name</code>)</strong> - The specified
* <code>name</code> 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 <code>BeanInfo</code> class, a property named "xyz"
* will have a getter method named <code>getXyz()</code> or (for boolean
* properties only) <code>isXyz()</code>, and a setter method named
* <code>setXyz()</code>.</li>
* <li><strong>Nested (<code>name1.name2.name3</code>)</strong> 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 <code>name2</code>, and so on. The property value that
* is ultimately retrieved or modified is the one identified by the
* last name element.</li>
* <li><strong>Indexed (<code>name[index]</code>)</strong> - 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.</li>
* <li><strong>Combined (<code>name1.name2[index].name3</strong> - Various
* forms combining nested and indexed references are also supported.</li>
* </ul>
*/
public class PropertyUtils {
// ----------------------------------------------------- Manifest Constants
/**
* The delimiter that preceeds the zero-relative subscript for an
* indexed reference.
*/
public static final char INDEXED_DELIM = '[';
/**
* The delimiter that follows the zero-relative subscript for an
* indexed reference.
*/
public static final char INDEXED_DELIM2 = ']';
/**
* The delimiter that separates the components of a nested reference.
*/
public static final char NESTED_DELIM = '.';
/**
* The cache of PropertyDescriptor arrays for beans we have already
* introspected, keyed by the fully qualified class name of this object.
*/
private static Map descriptorsCache = Collections.synchronizedMap(new WeakHashMap());;
// --------------------------------------------------------- Public Methods
/**
* 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
* <code>BeanInfo</code> 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.
*
* @param dest Destination bean whose properties are modified
* @param orig Origin bean whose properties are retrieved
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if the <code>dest</code> or
* <code>orig</code> argument is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static void copyProperties(Object dest, Object orig)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException
{
if (dest == null)
throw new IllegalArgumentException
("No destination bean specified");
if (orig == null)
throw new IllegalArgumentException("No origin bean specified");
PropertyDescriptor origDescriptors[] = getPropertyDescriptors(orig);
for (int i = 0; i < origDescriptors.length; i++) {
String name = origDescriptors[i].getName();
if (getPropertyDescriptor(dest, name) != null) {
Object value = getSimpleProperty(orig, name);
try {
setSimpleProperty(dest, name, value);
} catch (NoSuchMethodException e) {
; // Skip non-matching property
}
}
}
}
/**
* 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 <code>getReadMethod()</code> returns non-null).
*
* @param bean Bean whose properties are to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Map describe(Object bean)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
PropertyDescriptor descriptors[] =
PropertyUtils.getPropertyDescriptors(bean);
Map description = new HashMap(descriptors.length);
for (int i = 0; i < descriptors.length; i++) {
String name = descriptors[i].getName();
if (descriptors[i].getReadMethod() != null)
description.put(name, getProperty(bean, name));
}
return (description);
}
/**
* 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 <code>IllegalArgumentException</code> will be
* thrown.
*
* @param bean Bean whose property is to be extracted
* @param name <code>propertyname[index]</code> of the property value
* to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Object getIndexedProperty(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException
{
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Identify the index of the requested individual property
int delim = name.indexOf(INDEXED_DELIM);
int delim2 = name.indexOf(INDEXED_DELIM2);
if ((delim < 0) || (delim2 <= delim))
throw new IllegalArgumentException("Invalid indexed property '" +
name + "'");
int index = -1;
try {
String subscript = name.substring(delim + 1, delim2);
index = Integer.parseInt(subscript);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Invalid indexed property '" +
name + "'");
}
name = name.substring(0, delim);
// Request the specified indexed property value
return (getIndexedProperty(bean, name, index));
}
/**
* Return the value of the specified indexed property of the specified
* bean, with no type conversions.
*
* @param bean Bean whose property is to be extracted
* @param name Simple property name of the property value to be extracted
* @param index Index of the property value to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Object getIndexedProperty(Object bean,
String name, int index)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException
{
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Retrieve the property descriptor for the specified property
PropertyDescriptor descriptor =
getPropertyDescriptor(bean, name);
if (descriptor == null)
throw new NoSuchMethodException("Unknown property '" +
name + "'");
// Call the indexed getter method if there is one
if (descriptor instanceof IndexedPropertyDescriptor) {
Method readMethod = ((IndexedPropertyDescriptor) descriptor).
getIndexedReadMethod();
if (readMethod != null) {
Object subscript[] = new Object[1];
subscript[0] = new Integer(index);
return (readMethod.invoke(bean, subscript));
}
}
// Otherwise, the underlying property must be an array
Method readMethod = getReadMethod(descriptor);
if (readMethod == null)
throw new NoSuchMethodException("Property '" + name +
"' has no getter method");
// Call the property getter and return the value
Object value = readMethod.invoke(bean, new Object[0]);
if (!value.getClass().isArray())
throw new IllegalArgumentException("Property '" + name +
"' is not indexed");
return (Array.get(value, index));
}
/**
* Return the value of the (possibly nested) property of the specified
* name, for the specified bean, with no type conversions.
*
* @param bean Bean whose property is to be extracted
* @param name Possibly nested name of the property to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if a nested reference to a
* property returns null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Object getNestedProperty(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException
{
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
while (true) {
int delim = name.indexOf(NESTED_DELIM);
if (delim < 0)
break;
String next = name.substring(0, delim);
if (next.indexOf(INDEXED_DELIM) >= 0)
bean = getIndexedProperty(bean, next);
else
bean = getSimpleProperty(bean, next);
if (bean == null)
throw new IllegalArgumentException
("Null property value for '" +
name.substring(0, delim) + "'");
name = name.substring(delim + 1);
}
if (name.indexOf(INDEXED_DELIM) >= 0)
return (getIndexedProperty(bean, name));
else
return (getSimpleProperty(bean, name));
}
/**
* Return the value of the specified property of the specified bean,
* no matter which property reference format is used, with no
* type conversions.
*
* @param bean Bean whose property is to be extracted
* @param name Possibly indexed and/or nested name of the property
* to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Object getProperty(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
return (getNestedProperty(bean, name));
}
/**
* Return the value of the specified array property of the specified
* bean, as a String array.
*
* @param bean Bean whose property is to be extracted
* @param name Name of the property to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static String[] getArrayProperty(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
Object value = getProperty(bean, name);
if (value == null) {
return (null);
} else if (value instanceof Collection) {
ArrayList values = new ArrayList();
Iterator items = ((Collection) value).iterator();
while (items.hasNext()) {
Object item = items.next();
if (item == null)
values.add((String) null);
else
values.add(item.toString());
}
return ((String[]) values.toArray(new String[values.size()]));
} else if (value.getClass().isArray()) {
ArrayList values = new ArrayList();
try {
int n = Array.getLength(value);
for (int i = 0; i < n; i++) {
values.add(Array.get(value, i).toString());
}
} catch (ArrayIndexOutOfBoundsException e) {
;
}
return ((String[]) values.toArray(new String[values.size()]));
} else {
String results[] = new String[1];
results[0] = value.toString();
return (results);
}
}
/**
* Retrieve the property descriptor for the specified property of the
* specified bean, or return <code>null</code> 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.
*
* @param bean Bean for which a property descriptor is requested
* @param name Possibly indexed and/or nested name of the property for
* which a property descriptor is requested
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if a nested reference to a
* property returns null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static PropertyDescriptor getPropertyDescriptor(Object bean,
String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException
{
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Resolve nested references
while (true) {
int period = name.indexOf(NESTED_DELIM);
if (period < 0)
break;
String next = name.substring(0, period);
if (next.indexOf(INDEXED_DELIM) >= 0)
bean = getIndexedProperty(bean, next);
else
bean = getSimpleProperty(bean, next);
if (bean == null)
throw new IllegalArgumentException
("Null property value for '" +
name.substring(0, period) + "'");
name = name.substring(period + 1);
}
// Remove any subscript from the final name value
int left = name.indexOf(INDEXED_DELIM);
if (left >= 0)
name = name.substring(0, left);
// Look up and return this property from our cache
if ((bean == null) || (name == null))
return (null);
PropertyDescriptor descriptors[] = getPropertyDescriptors(bean);
if (descriptors == null)
return (null);
for (int i = 0; i < descriptors.length; i++) {
if (name.equals(descriptors[i].getName()))
return (descriptors[i]);
}
return (null);
}
/**
* Retrieve the property descriptors for the specified bean, introspecting
* and caching them the first time a particular bean class is encountered.
*
* @param bean Bean for which property descriptors are requested
*
* @exception IllegalArgumentException if <code>bean</code> is null
*/
public static PropertyDescriptor[] getPropertyDescriptors(Object bean)
{
if (bean == null)
throw new IllegalArgumentException("No bean specified");
return getPropertyDescriptors(bean.getClass());
}
public static PropertyDescriptor[] getPropertyDescriptors(Class clazz)
{
PropertyDescriptor[] descriptors = null;
// descriptors = (PropertyDescriptor[])propertyDescriptors.get(clazz);
// Check if available
if (descriptors == null)
{
descriptors = searchPropertyDescriptors(clazz);
}
return descriptors;
}
public static PropertyDescriptor[] searchPropertyDescriptors(Class clazz)
{
BeanInfo bi;
try
{
bi = Introspector.getBeanInfo(clazz, Object.class);
} catch (IntrospectionException e)
{
// We're in trouble
// Let it try again on next request, but return "nothing" for now
return new PropertyDescriptor[0];
}
// Get list of descriptors that are ok
PropertyDescriptor[] descriptors = bi.getPropertyDescriptors();
List list = new ArrayList(descriptors.length);
for (int i = 0; i < descriptors.length; i++)
{
PropertyDescriptor descriptor = descriptors[i];
Method m = descriptor.getWriteMethod();
if (m != null && !m.getDeclaringClass().equals(Object.class))
{
list.add(descriptor);
}
}
descriptors = new PropertyDescriptor[list.size()];
list.toArray(descriptors);
return descriptors;
}
/**
* 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 <code>getPropertyDescriptor()</code>,
* so if the last element of a name reference is indexed, the property
* editor for the underlying property's class is returned.
* <p>
* Note that <code>null</code> 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.
*
* @param bean Bean for which a property descriptor is requested
* @param name Possibly indexed and/or nested name of the property for
* which a property descriptor is requested
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if a nested reference to a
* property returns null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Class getPropertyEditorClass(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
PropertyDescriptor descriptor =
getPropertyDescriptor(bean, name);
if (descriptor != null)
return (descriptor.getPropertyEditorClass());
else
return (null);
}
/**
* Return the Java Class representing the property type of the specified
* property, or <code>null</code> if there is no such property for the
* specified bean. This method follows the same name resolution rules
* used by <code>getPropertyDescriptor()</code>, 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, <code>null</code> is returned.
*
* @param bean Bean for which a property descriptor is requested
* @param name Possibly indexed and/or nested name of the property for
* which a property descriptor is requested
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if a nested reference to a
* property returns null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Class getPropertyType(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
PropertyDescriptor descriptor =
getPropertyDescriptor(bean, name);
if (descriptor == null)
return (null);
else if (descriptor instanceof IndexedPropertyDescriptor)
return (((IndexedPropertyDescriptor) descriptor).
getIndexedPropertyType());
else
return (descriptor.getPropertyType());
}
/**
* Return an accessible property getter method for this property,
* if there is one; otherwise return <code>null</code>.
*
* @param descriptor Property descriptor to return a getter for
*/
public static Method getReadMethod(PropertyDescriptor descriptor) {
return (getAccessibleMethod(descriptor.getReadMethod()));
}
/**
* Return the value of the specified simple property of the specified
* bean, with no type conversions.
*
* @param bean Bean whose property is to be extracted
* @param name Name of the property to be extracted
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if the property name
* is nested or indexed
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static Object getSimpleProperty(Object bean, String name)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Validate the syntax of the property name
if (name.indexOf(NESTED_DELIM) >= 0)
throw new IllegalArgumentException
("Nested property names are not allowed");
else if (name.indexOf(INDEXED_DELIM) >= 0)
throw new IllegalArgumentException
("Indexed property names are not allowed");
// Retrieve the property getter method for the specified property
PropertyDescriptor descriptor =
getPropertyDescriptor(bean, name);
if (descriptor == null)
throw new NoSuchMethodException("Unknown property '" +
name + "'");
Method readMethod = getReadMethod(descriptor);
if (readMethod == null)
throw new NoSuchMethodException("Property '" + name +
"' has no getter method");
// Call the property getter and return the value
Object value = readMethod.invoke(bean, new Object[0]);
return (value);
}
/**
* Return an accessible property setter method for this property,
* if there is one; otherwise return <code>null</code>.
*
* @param descriptor Property descriptor to return a setter for
*/
public static Method getWriteMethod(PropertyDescriptor descriptor) {
return (getAccessibleMethod(descriptor.getWriteMethod()));
}
/**
* 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 <code>IllegalArgumentException</code> will be
* thrown.
*
* @param bean Bean whose property is to be modified
* @param name <code>propertyname[index]</code> of the property value
* to be modified
* @param value Value to which the specified property element
* should be set
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static void setIndexedProperty(Object bean, String name,
Object value)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Identify the index of the requested individual property
int delim = name.indexOf(INDEXED_DELIM);
int delim2 = name.indexOf(INDEXED_DELIM2);
if ((delim < 0) || (delim2 <= delim))
throw new IllegalArgumentException("Invalid indexed property '" +
name + "'");
int index = -1;
try {
String subscript = name.substring(delim + 1, delim2);
index = Integer.parseInt(subscript);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Invalid indexed property '" +
name + "'");
}
name = name.substring(0, delim);
// Set the specified indexed property value
setIndexedProperty(bean, name, index, value);
}
/**
* Set the value of the specified indexed property of the specified
* bean, with no type conversions.
*
* @param bean Bean whose property is to be set
* @param name Simple property name of the property value to be set
* @param index Index of the property value to be set
* @param value Value to which the indexed property element is to be set
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static void setIndexedProperty(Object bean, String name,
int index, Object value)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Retrieve the property descriptor for the specified property
PropertyDescriptor descriptor =
getPropertyDescriptor(bean, name);
if (descriptor == null)
throw new NoSuchMethodException("Unknown property '" +
name + "'");
// Call the indexed setter method if there is one
if (descriptor instanceof IndexedPropertyDescriptor) {
Method writeMethod = ((IndexedPropertyDescriptor) descriptor).
getIndexedWriteMethod();
if (writeMethod != null) {
Object subscript[] = new Object[2];
subscript[0] = new Integer(index);
subscript[1] = value;
writeMethod.invoke(bean, subscript);
return;
}
}
// Otherwise, the underlying property must be an array
Method readMethod = descriptor.getReadMethod();
if (readMethod == null)
throw new NoSuchMethodException("Property '" + name +
"' has no getter method");
// Call the property getter to get the array
Object array = readMethod.invoke(bean, new Object[0]);
if (!array.getClass().isArray())
throw new IllegalArgumentException("Property '" + name +
"' is not indexed");
// Modify the specified value
Array.set(array, index, value);
}
/**
* Set the value of the (possibly nested) property of the specified
* name, for the specified bean, with no type conversions.
*
* @param bean Bean whose property is to be modified
* @param name Possibly nested name of the property to be modified
* @param value Value to which the property is to be set
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if a nested reference to a
* property returns null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static void setNestedProperty(Object bean,
String name, Object value)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
while (true) {
int delim = name.indexOf(NESTED_DELIM);
if (delim < 0)
break;
String next = name.substring(0, delim);
if (next.indexOf(INDEXED_DELIM) >= 0)
bean = getIndexedProperty(bean, next);
else
bean = getSimpleProperty(bean, next);
if (bean == null)
throw new IllegalArgumentException
("Null property value for '" +
name.substring(0, delim) + "'");
name = name.substring(delim + 1);
}
if (name.indexOf(INDEXED_DELIM) >= 0)
setIndexedProperty(bean, name, value);
else
setSimpleProperty(bean, name, value);
}
/**
* Set the value of the specified property of the specified bean,
* no matter which property reference format is used, with no
* type conversions.
*
* @param bean Bean whose property is to be modified
* @param name Possibly indexed and/or nested name of the property
* to be modified
* @param value Value to which this property is to be set
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static void setProperty(Object bean, String name, Object value)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
setNestedProperty(bean, name, value);
}
/**
* Set the value of the specified simple property of the specified bean,
* with no type conversions.
*
* @param bean Bean whose property is to be modified
* @param name Name of the property to be modified
* @param value Value to which the property should be set
*
* @exception IllegalAccessException if the caller does not have
* access to the property accessor method
* @exception IllegalArgumentException if <code>bean</code> or
* <code>name</code> is null
* @exception IllegalArgumentException if the property name is
* nested or indexed
* @exception InvocationTargetException if the property accessor method
* throws an exception
* @exception NoSuchMethodException if an accessor method for this
* propety cannot be found
*/
public static void setSimpleProperty(Object bean,
String name, Object value)
throws IllegalAccessException, InvocationTargetException,
NoSuchMethodException {
if (bean == null)
throw new IllegalArgumentException("No bean specified");
if (name == null)
throw new IllegalArgumentException("No name specified");
// Validate the syntax of the property name
if (name.indexOf(NESTED_DELIM) >= 0)
throw new IllegalArgumentException
("Nested property names are not allowed");
else if (name.indexOf(INDEXED_DELIM) >= 0)
throw new IllegalArgumentException
("Indexed property names are not allowed");
// Retrieve the property setter method for the specified property
PropertyDescriptor descriptor =
getPropertyDescriptor(bean, name);
if (descriptor == null)
throw new NoSuchMethodException("Unknown property '" +
name + "'");
Method writeMethod = getWriteMethod(descriptor);
if (writeMethod == null)
throw new NoSuchMethodException("Property '" + name +
"' has no setter method");
// Call the property setter method
Object values[] = new Object[1];
values[0] = value;
writeMethod.invoke(bean, values);
}
// -------------------------------------------------------- Private Methods
/**
* Return an accessible method (that is, one that can be invoked via
* reflection) that implements the specified Method. If no such method
* can be found, return <code>null</code>.
*
* @param method The method that we wish to call
*/
private static Method getAccessibleMethod(Method method) {
// Make sure we have a method to check
if (method == null) {
return (null);
}
// If the requested method is not public we cannot call it
if (!Modifier.isPublic(method.getModifiers())) {
return (null);
}
// If the declaring class is public, we are done
Class clazz = method.getDeclaringClass();
if (Modifier.isPublic(clazz.getModifiers())) {
return (method);
}
// Check the implemented interfaces and subinterfaces
String methodName = method.getName();
Class[] parameterTypes = method.getParameterTypes();
method =
getAccessibleMethodFromInterfaceNest(clazz,
method.getName(),
method.getParameterTypes());
return (method);
/*
Class[] interfaces = clazz.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
// Is this interface public?
if (!Modifier.isPublic(interfaces[i].getModifiers())) {
continue;
}
// Does the method exist on this interface?
try {
method = interfaces[i].getDeclaredMethod(methodName,
parameterTypes);
} catch (NoSuchMethodException e) {
continue;
}
// We have found what we are looking for
return (method);
}
// We are out of luck
return (null);
*/
}
/**
* Return an accessible method (that is, one that can be invoked via
* reflection) that implements the specified method, by scanning through
* all implemented interfaces and subinterfaces. If no such Method
* can be found, return <code>null</code>.
*
* @param clazz Parent class for the interfaces to be checked
* @param methodName Method name of the method we wish to call
* @param parameterTypes The parameter type signatures
*/
private static Method getAccessibleMethodFromInterfaceNest
(Class clazz, String methodName, Class parameterTypes[]) {
Method method = null;
// Check the implemented interfaces of the parent class
Class interfaces[] = clazz.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
// Is this interface public?
if (!Modifier.isPublic(interfaces[i].getModifiers()))
continue;
// Does the method exist on this interface?
try {
method = interfaces[i].getDeclaredMethod(methodName,
parameterTypes);
} catch (NoSuchMethodException e) {
;
}
if (method != null)
break;
// Recursively check our parent interfaces
method =
getAccessibleMethodFromInterfaceNest(interfaces[i],
methodName,
parameterTypes);
if (method != null)
break;
}
// Return whatever we have found
return (method);
}
}