de.alpharogroup.model.property

Class PropertyResolver

java.lang.Object

de.alpharogroup.model.property.PropertyResolver

public final class PropertyResolver
extends Object

This class parses expressions to lookup or set a value on the object that is given.
The supported expressions are:

"property": This could be a bean property with get and set method. Or if a map is given as an object it will be lookup with the property as a key when there is not get method for that property.

"property1.property2": Both properties are looked up as described above. If property1 evaluates to null then if there is a setMethod (or if it is a map) and the Class of the property has a default constructor then the object will be constructed and set on the object.

"property.index": If the property is a List or Array then the second property can be a index on that list like: 'mylist.0' this expression will also map on a getProperty(index) or setProperty(index,value) methods. If the object is a List then the list will grow automatically if the index is greater than the size

Index or map properties can also be written as: "property[index]" or "property[key]"

Note that the property resolver by default provides access to private members and methods. If guaranteeing encapsulation of the target objects is a big concern, you should consider using an alternative implementation.

Note: If a property evaluates to an instance of Model then the expression should use '.object' to work with its value.

Author:

jcompagner

Method Summary

Modifier and Type	Method and Description
static void	destroy(Object application) Clean up cache for this app.
static <T> Class<T>	getPropertyClass(String expression, Class<?> clz) Gets the property class.
static Class<?>	getPropertyClass(String expression, Object object) Gets the property class.
static Field	getPropertyField(String expression, Object object) Gets the property field.
static Method	getPropertyGetter(String expression, Object object) Gets the property getter.
static Method	getPropertySetter(String expression, Object object) Gets the property setter.
static Object	getValue(String expression, Object object) Looks up the value from the object with the given expression.
static CharSequence	replaceAll(CharSequence s, CharSequence searchFor, CharSequence replaceWith) Replace all occurrences of one string replaceWith another string.
static void	setClassCache(Object application, de.alpharogroup.model.api.ClassCache classCache) Sets the ClassCache for the given application.
static void	setValue(String expression, Object object, Object value) Set the value on the object with the given expression.

Methods inherited from class java.lang.Object

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

Method Detail

destroy

public static void destroy(Object application)

Clean up cache for this app.

Parameters:

application - the application

getPropertyClass

public static <T> Class<T> getPropertyClass(String expression,
                                            Class<?> clz)

Gets the property class.

Type Parameters:

T - the generic type

Parameters:

expression - the expression

clz - the class

Returns:

class of the target Class property expression

Throws:

RuntimeException - if class cannot be resolved

getPropertyClass

public static final Class<?> getPropertyClass(String expression,
                                              Object object)

Gets the property class.

Parameters:

expression - the expression

object - the object

Returns:

class of the target property object

Throws:

RuntimeException - if the cannot be resolved

getPropertyField

public static final Field getPropertyField(String expression,
                                           Object object)

Gets the property field.

Parameters:

expression - the expression

object - the object

Returns:

Field for the property expression

Throws:

RuntimeException - if there is no such field

getPropertyGetter

public static final Method getPropertyGetter(String expression,
                                             Object object)

Gets the property getter.

Parameters:

expression - the expression

object - the object

Returns:

Getter method for the property expression

Throws:

RuntimeException - if there is no getter method

getPropertySetter

public static final Method getPropertySetter(String expression,
                                             Object object)

Gets the property setter.

Parameters:

expression - the expression

object - the object

Returns:

Setter method for the property expression

Throws:

RuntimeException - if there is no setter method

getValue

public static final Object getValue(String expression,
                                    Object object)

Looks up the value from the object with the given expression. If the expression, the object itself or one property evaluates to null then a null will be returned.

Parameters:

expression - The expression string with the property to be lookup.

object - The object which is evaluated.

Returns:

The value that is evaluated. Null something in the expression evaluated to null.

replaceAll

public static CharSequence replaceAll(CharSequence s,
                                      CharSequence searchFor,
                                      CharSequence replaceWith)

Replace all occurrences of one string replaceWith another string.

Parameters:

s - The string to process

searchFor - The value to search for

replaceWith - The value to searchFor replaceWith

Returns:

The resulting string with searchFor replaced with replaceWith

setClassCache

public static void setClassCache(Object application,
                                 de.alpharogroup.model.api.ClassCache classCache)

Sets the ClassCache for the given application. If the Application is null then it will be the default if no application is found. So if you want to be sure that your ClassCache is handled in all situations then call this method twice with your implementations. One time for the application and the second time with null.

Parameters:

application - to use or null if the default must be set.

classCache - the class cache

setValue

public static final void setValue(String expression,
                                  Object object,
                                  Object value)

Set the value on the object with the given expression. If the expression can't be evaluated then a RuntimeException will be thrown. If a null object is encountered then it will try to generate it by calling the default constructor and set it on the object. The value will be tried to convert to the right type with the given converter.

Parameters:

expression - The expression string with the property to be set.

object - The object which is evaluated to set the value on.

value - The value to set.

Throws:

RuntimeException - is thrown if expression is empty or the object is null or the setter could not be found