/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.webapp;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.validator.Validator;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
/**
* <p><strong>ValidatorELTag</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 UIComponentTagBase}) during the execution of the
* current page.</p>
*
* <p>This class must be used as a base class for tag instances that
* support specific {@link Validator} subclasses.</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>
*
*/
public abstract class ValidatorELTag extends TagSupport {
// --------------------------------------------------------- Public Methods
private static final long serialVersionUID = -4373376368829344328L;
/**
* <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 UIComponentTagBase} instance, if
* the {@link UIComponent} instance was created by this execution of the
* containing JSP page.</p>
*
* @throws JspException if a JSP error occurs
*/
@Override
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) {
// PENDING i18n
throw new JspException("Can't create class of type:"+
" javax.faces.validator.Validator. Validator is null");
}
// Register an instance with the appropriate component
((EditableValueHolder)component).addValidator(validator);
return (SKIP_BODY);
}
// ------------------------------------------------------ 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
*
* @return the created {@code Validator}
*/
protected abstract Validator createValidator()
throws JspException;
}