javax.faces.view.facelets.ValidatorHandler Maven / Gradle / Ivy
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package javax.faces.view.facelets;
import javax.faces.view.EditableValueHolderAttachedObjectHandler;
/**
* Handles setting a {@link
* javax.faces.validator.Validator} instance on an {@link
* javax.faces.component.EditableValueHolder} parent. Will wire all
* attributes set to the Validator instance
* created/fetched. Uses the "binding" attribute for grabbing instances
* to apply attributes to.
* Will only set/create Validator is the passed UIComponent's parent
* is null, signifying that it wasn't restored from an existing
* tree.
*/
public class ValidatorHandler extends FaceletsAttachedObjectHandler implements EditableValueHolderAttachedObjectHandler {
private String validatorId;
private TagHandlerDelegate helper;
private ValidatorConfig config;
/**
* Construct this instance around the configuration information in argument config
* @param config the TagConfig subclass for this kind
* of attached object.
*/
public ValidatorHandler(ValidatorConfig config) {
super(config);
this.config = config;
this.validatorId = config.getValidatorId();
}
/**
* Return the implementation specific
* delegate instance that provides the bulk of the work for this
* handler instance.
*
* @return the implementation specific delegate instance
*/
@Override
protected TagHandlerDelegate getTagHandlerDelegate() {
if (null == helper) {
helper = delegateFactory.createValidatorHandlerDelegate(this);
}
return helper;
}
/**
* Retrieve the id of the validator that is to be created and
* added to the parent EditableValueHolder. All
* subclasses should override this method because it is important
* for Facelets to have a unique way of identifying the validators
* that are added to this EditableValueHolder and
* allows exclusions to work properly. An exclusion is a validator
* declaration that has the attribute "disabled" which resolves to
* false, instructing Facelets not to register a default validator
* with the same id.
*
* @param ctx the FaceletContext for this {@code Facelet}
*
* @return the validator-id
*/
public String getValidatorId(FaceletContext ctx) {
if (validatorId == null) {
TagAttribute idAttr = getAttribute("validatorId");
if (idAttr == null) {
return null;
} else {
return idAttr.getValue(ctx);
}
}
return validatorId;
}
/**
* Return the TagConfig
* subclass used to configure this handler instance.
*
* @return the TagConfig subclass used to configure this handler instance.
*/
public ValidatorConfig getValidatorConfig() {
return config;
}
}