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 DefaultResolver()
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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