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package javax.faces.webapp;
import javax.el.
ValueExpression;
import javax.faces.component.
EditableValueHolder;
import javax.faces.component.
UIComponent;
import javax.faces.context.
FacesContext;
import javax.faces.validator.
Validator;
import javax.servlet.jsp.
JspException;
import javax.servlet.jsp.tagext.
TagSupport;
/**
* <p><strong>ValidatorTag</strong> is a base class for all JSP custom actions
* that create and register a <code>Validator</code> instance on the
* {@link EditableValueHolder} associated with our most immediate surrounding instance
* of a tag whose implementation class is a subclass of {@link UIComponentTag}.
* To avoid creating duplicate instances when a page is redisplayed,
* creation and registration of a {@link Validator} occurs
* <strong>only</strong> if the corresponding {@link UIComponent} was
* created (by the owning {@link UIComponentTag}) during the execution of the
* current page.</p>
*
* <p>This class may be used directly to implement a generic validator
* registration tag (based on the validator-id specified by the
* <code>id</code> attribute), or as a base class for tag instances that
* support specific {@link Validator} subclasses. This <code>id</code>
* attribute must refer to one of the well known validator-ids, or a
* custom validator-id as defined in a <code>faces-config.xml</code>
* file.</p>
*
* <p>Subclasses of this class must implement the
* <code>createValidator()</code> method, which creates and returns a
* {@link Validator} instance. Any configuration properties that specify
* the limits to be enforced by this {@link Validator} must have been
* set by the <code>createValidator()</code> method. Generally, this occurs
* by copying corresponding attribute values on the tag instance.</p>
*
* <p>This tag creates no output to the page currently being created. It
* is used solely for the side effect of {@link Validator} creation.</p>
*
* @deprecated This has been partially replaced by {@link
* ValidatorELTag}. The remainder of the functionality, namely, the
* binding facility and the implementation of the {@link
* #createValidator} method, is now an implementation detail.
*/
public class
ValidatorTag extends
TagSupport {
// ---------------------------------------------------------- Static Members
private static final long
serialVersionUID = -5562623615418158868L;
// ------------------------------------------------------------- Attributes
/**
* <p>The identifier of the {@link Validator} instance to be created.</p>
*/
private
String validatorId = null;
/**
* <p>The {@link ValueExpression} that evaluates to an object that
* implements {@link Validator}.</p>
*/
private
String binding = null;
/**
* <p>Set the identifer of the {@link Validator} instance to be created.
*
* @param validatorId The new identifier of the validator instance to be
* created.
*/
public void
setValidatorId(
String validatorId) {
this.
validatorId =
validatorId;
}
/**
* <p>Set the expression that will be used to create a {@link ValueExpression}
* that references a backing bean property of the {@link Validator} instance to
* be created.</p>
*
* @param binding The new expression
*
* @throws JspException if a JSP error occurs
*/
public void
setBinding(
String binding)
throws
JspException {
if (
binding != null && !
UIComponentTag.
isValueReference(
binding)) {
//PENDING i18n
throw new
JspException("Invalid Expression:"+
binding);
}
this.
binding =
binding;
}
// --------------------------------------------------------- Public Methods
/**
* <p>Create a new instance of the specified {@link Validator}
* class, and register it with the {@link UIComponent} instance associated
* with our most immediately surrounding {@link UIComponentTag} instance, if
* the {@link UIComponent} instance was created by this execution of the
* containing JSP page.</p>
*
* @throws JspException if a JSP error occurs
*/
public int
doStartTag() throws
JspException {
// Locate our parent UIComponentTag
UIComponentClassicTagBase tag =
UIComponentClassicTagBase.
getParentUIComponentClassicTagBase(
pageContext);
if (
tag == null) {
//PENDING i18n
throw new
JspException("Not nested in a UIComponentTag Error for tag with handler class:"+
this.
getClass().
getName());
}
// Nothing to do unless this tag created a component
if (!
tag.
getCreated()) {
return (
SKIP_BODY);
}
UIComponent component =
tag.
getComponentInstance();
if (
component == null) {
//PENDING i18n
throw new
JspException("Can't create Component from tag.");
}
if (!(
component instanceof
EditableValueHolder)) {
// PENDING i18n
throw new
JspException("Not nested in a tag of proper type. Error for tag with handler class:"+
this.
getClass().
getName());
}
Validator validator =
createValidator();
if (
validator == null) {
//noinspection NonConstantStringShouldBeStringBuffer
String validateError = null;
if (
binding != null) {
validateError =
binding;
}
if (
validatorId != null) {
if (
validateError != null) {
validateError += " or " +
validatorId;
} else {
validateError =
validatorId;
}
}
// PENDING i18n
throw new
JspException("Can't create class of type:"+
"javax.faces.validator.Validator from:"+
validateError);
}
// Register an instance with the appropriate component
((
EditableValueHolder)
component).
addValidator(
validator);
return (
SKIP_BODY);
}
/**
* <p>Release references to any acquired resources.
*/
public void
release() {
this.
id = null;
}
// ------------------------------------------------------ Protected Methods
/**
* <p>Create and return a new {@link Validator} to be registered
* on our surrounding {@link UIComponent}.</p>
*
* @throws JspException if a new instance cannot be created
*/
protected
Validator createValidator()
throws
JspException {
FacesContext context =
FacesContext.
getCurrentInstance();
Validator validator = null;
ValueExpression vb = null;
// If "binding" is set, use it to create a validator instance.
if (
binding != null) {
try {
vb =
context.
getApplication().
getExpressionFactory().
createValueExpression(
context.
getELContext(),
binding,
Object.class);
if (
vb != null) {
validator = (
Validator)
vb.
getValue(
context.
getELContext());
if (
validator != null) {
return
validator;
}
}
} catch (
Exception e) {
throw new
JspException(
e);
}
}
// If "validatorId" is set, use it to create the validator
// instance. If "validatorId" and "binding" are both set, store the
// validator instance in the value of the property represented by
// the value binding expression.
if (
validatorId != null) {
try {
String validatorIdVal =
validatorId;
if (
UIComponentTag.
isValueReference(
validatorId)) {
ValueExpression idBinding =
context.
getApplication().
getExpressionFactory().
createValueExpression(
context.
getELContext(),
validatorId,
Object.class);
validatorIdVal = (
String)
idBinding.
getValue(
context.
getELContext());
}
validator =
context.
getApplication().
createValidator(
validatorIdVal);
if (
validator != null) {
if (
vb != null) {
vb.
setValue(
context.
getELContext(),
validator);
}
}
} catch (
Exception e) {
throw new
JspException(
e);
}
}
return
validator;
}
}