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java.lang.Object
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+--org.apache.struts.action.ActionForm
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+--org.apache.struts.validator.ValidatorForm
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+--org.apache.struts.validator.BeanValidatorForm
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+--org.apache.struts.validator.LazyValidatorForm
Struts Lazy ActionForm which wraps a LazyDynaBean.
There isn't really that much to this implementation as most of the lazy behaviour is in
LazyDynaBean and wrapping the LazyDynaBean is handled in the parent
BeanValidatorForm. The only thing it really does is populate indexed properties
which are a List type with a LazyDynaBean in the get(name, index)
method.
Lazy DynaBeans provide several types of lazy behaviour:
List or
Array to accomodate the index value being set.List
or Array for indexed properties, if it doesn't exist.Map
for mapped properties, if it doesn't exist.Using this lazy ActionForm means that you don't have to define the ActionForm's
properties in the struts-config.xml. However, a word of warning, everything in the
Request gets populated into this ActionForm circumventing the normal firewall
function of Struts forms. Therefore you should only take out of this form properties you expect
to be there rather than blindly populating all the properties into the business tier.
Having said that it is not necessary to pre-define properties in the struts-config.xml, it is
useful to sometimes do so for mapped or indexed properties. For example, if you want to use
a different Map implementation from the default HashMap or an array for indexed
properties, rather than the default List type:
<form-bean name="myForm" type="org.apache.struts.validator.LazyValidatorForm">
<form-property name="myMap" type="java.util.TreeMap" />
<form-property name="myBeans" type="org.apache.commons.beanutils.LazyDynaBean[]" />
</form-bean>
Another reason for defining indexed properties in the struts-config.xml is that
if you are validating indexed properties using the Validator and none are submitted then the indexed
property will be null which causes validator to fail. Pre-defining them in the
struts-config.xml will result in a zero-length indexed property (array or List) being
instantiated, avoiding an issue with validator in that circumstance.
This implementation validates using the ActionForm name. If you require a version that validates according to the path then it can be easily created in the following manner:
public class MyLazyForm extends LazyValidatorForm {
public MyLazyForm () {
super();
setPathValidation(true);
}
}
Rather than using this class, another alternative is to either use a LazyDynaBean or
custom version of LazyDynaBean directly. Struts now automatically wraps objects
which are not ActionForms in a BeanValidatorForm. For example:
<form-bean name="myForm" type="org.apache.commons.beanutils.LazyDynaBean">
<form-property name="myBeans" type="org.apache.commons.beanutils.LazyDynaBean[]" />
</form-bean>
| Fields inherited from class org.apache.struts.validator.BeanValidatorForm |
dynaBean, logger, pathValidation |
| Fields inherited from class org.apache.struts.validator.ValidatorForm |
log, page, validatorResults |
| Fields inherited from class org.apache.struts.action.ActionForm |
multipartRequestHandler, servlet |
| Constructor Summary | |
LazyValidatorForm()
Default Constructor which creates a LazyDynaBean to back
this form. |
|
LazyValidatorForm(org.apache.commons.beanutils.DynaBean bean)
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|
| Method Summary | |
java.lang.Object |
get(java.lang.String name,
int index)
Return an indexed property value. |
java.util.Map |
getMap()
Return the Map containing the property values. |
protected org.apache.commons.beanutils.DynaBean |
newIndexedBean(java.lang.String name)
Creates new DynaBean instances to populate
an 'indexed' property of beans - defaults to LazyDynaBean
type. |
| Methods inherited from class org.apache.struts.validator.BeanValidatorForm |
contains, get, get, getDynaBean, getDynaClass, getInstance, getValidationKey, isPathValidation, remove, set, set, set, setPathValidation, size |
| Methods inherited from class org.apache.struts.validator.ValidatorForm |
getPage, getResultValueMap, getValidatorResults, reset, setPage, setValidatorResults, validate |
| Methods inherited from class org.apache.struts.action.ActionForm |
getMultipartRequestHandler, getServlet, getServletWrapper, reset, setMultipartRequestHandler, setServlet, validate |
| Methods inherited from class java.lang.Object |
|
| Constructor Detail |
public LazyValidatorForm()
LazyDynaBean to back
this form.public LazyValidatorForm(org.apache.commons.beanutils.DynaBean bean)
| Method Detail |
public java.lang.Object get(java.lang.String name,
int index)
Return an indexed property value.
If the "indexed" property is a List type then
any missing values are populated with a bean (created in
the newIndexedBean(name) method - in this
implementation this is a LazyDynaBean type.
get in class BeanValidatorFormorg.apache.struts.validator.BeanValidatorFormname - Name of the property whose value is to be retrievedindex - Index of the value to be retrievedpublic java.util.Map getMap()
Return the Map containing the property values.
Provided so that properties can be access using JSTL.
protected org.apache.commons.beanutils.DynaBean newIndexedBean(java.lang.String name)
Creates new DynaBean instances to populate
an 'indexed' property of beans - defaults to LazyDynaBean
type.
Override this method if you require a different type of
DynaBean.
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