org.apache.commons.beanutils.expression
public class DefaultResolver extends Object implements Resolver
Resolver
Implementation.
This class assists in resolving property names in the following five formats, with the layout of an identifying String in parentheses:
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()
.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.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
name(key)
) - The JavaBean
is assumed to have an property getter and setter methods with an
additional attribute of type java.lang.String
.name1.name2[index].name3(key)
) -
Combining mapped, nested, and indexed references is also
supported.Constructor and Description |
---|
DefaultResolver()
Default Constructor.
|
Modifier and Type | Method and Description |
---|---|
int |
getIndex(String expression)
Return the index value from the property expression or -1.
|
String |
getKey(String expression)
Return the map key from the property expression or
null . |
String |
getProperty(String expression)
Return the property name from the property expression.
|
boolean |
hasNested(String expression)
Indicates whether or not the expression
contains nested property expressions or not.
|
boolean |
isIndexed(String expression)
Indicate whether the expression is for an indexed property or not.
|
boolean |
isMapped(String expression)
Indicate whether the expression is for a mapped property or not.
|
String |
next(String expression)
Extract the next property expression from the
current expression.
|
String |
remove(String expression)
Remove the last property expresson from the
current expression.
|
public int getIndex(String expression)
getIndex
in interface Resolver
expression
- The property expressionIllegalArgumentException
- If the indexed property is illegally
formed or has an invalid (non-numeric) value.public String getKey(String expression)
null
.getKey
in interface Resolver
expression
- The property expressionIllegalArgumentException
- If the mapped property is illegally formed.public String getProperty(String expression)
getProperty
in interface Resolver
expression
- The property expressionpublic boolean hasNested(String expression)
public boolean isIndexed(String expression)
public boolean isMapped(String expression)
public String next(String expression)
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