/*
* $Id: UIComponentTag.java,v 1.63 2007/05/30 20:07:21 kenpaulsen Exp $
*/
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. 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.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [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.application.Application;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
/**
* <p>{@link UIComponentTag} is the base class for all JSP custom
* actions that correspond to user interface components in a page that is
* rendered by JavaServer Faces.</p>
*
* <p>In this version of the specification, <code>UIComponentTag</code>
* extends {@link UIComponentClassicTagBase} to add properties that use
* the Faces 1.1 Expression Language.</p>
*
* @deprecated Use of this class has been replaced with {@link
* UIComponentELTag}, which extends
* <code>UIComponentClassicTagBase</code> to add properties that use the
* EL API introduced as part of JSP 2.1.
*/
public abstract class UIComponentTag extends UIComponentClassicTagBase implements Tag {
// ------------------------------------------------------------- Properties
/**
* <p>The value binding expression (if any) used to wire up this component
* to a {@link UIComponent} property of a JavaBean class.</p>
*/
private String binding = null;
/**
* <p>Set the value binding expression for our component.</p>
*
* @param binding The new value binding expression
*
* @throws IllegalArgumentException if the specified binding is not a
* valid value binding expression.
*/
public void setBinding(String binding) throws JspException {
if (!isValueReference(binding)) {
throw new IllegalArgumentException();
}
this.binding = binding;
}
protected boolean hasBinding() {
return null != binding;
}
/**
* <p>An override for the rendered attribute associated with our
* {@link UIComponent}.</p>
*/
private String rendered = null;
/**
* <p>Set an override for the rendered attribute.</p>
*
* @param rendered The new value for rendered attribute
*/
public void setRendered(String rendered) {
this.rendered = rendered;
}
/**
* <p>Flag indicating whether or not rendering should occur.</p>
*/
private boolean suppressed = false;
protected boolean isSuppressed() {
return (suppressed);
}
/**
* <p>Return <code>true</code> if the specified value conforms to the
* syntax requirements of a value binding expression. Such expressions
` * may be used on most component tag attributes to signal a desire for
* deferred evaluation of the attribute or property value to be set on
* the underlying {@link UIComponent}.</p>
*
* @param value The value to evaluate
*
* @throws NullPointerException if <code>value</code> is
* <code>null</code>
*/
public static boolean isValueReference(String value) {
if (value == null) {
throw new NullPointerException();
}
int start = value.indexOf("#{");
if ((start != -1) && (start < value.indexOf('}', start))) {
return true;
}
return false;
}
// ------------------------------------------ Methods from Tag
/**
* <p>Release any resources allocated during the execution of this
* tag handler.</p>
*/
public void release() {
this.suppressed = false;
this.binding = null;
this.rendered = null;
super.release();
}
// ---------------- Concrete Implementations of methods from superclass
/**
* @param component {@inheritDoc}
*/
protected void setProperties(UIComponent component) {
// The "id" property is explicitly set when components are created
// so it does not need to be set here
if (rendered != null) {
if (isValueReference(rendered)) {
ValueBinding vb =
getFacesContext().getApplication().createValueBinding(rendered);
component.setValueBinding("rendered", vb);
} else {
component.setRendered(Boolean.valueOf(rendered).booleanValue());
}
}
if (getRendererType() != null) {
component.setRendererType(getRendererType());
}
}
/**
* <p>Implement <code>createComponent</code> using Faces 1.1 EL
* API.</p>
*
* @param context {@inheritDoc}
* @param newId {@inheritDoc}
*/
protected UIComponent createComponent(FacesContext context, String newId) {
UIComponent component;
Application application = context.getApplication();
if (binding != null) {
ValueBinding vb = application.createValueBinding(binding);
component = application.createComponent(vb, context,
getComponentType());
component.setValueBinding("binding", vb);
} else {
component = application.createComponent(getComponentType());
}
component.setId(newId);
setProperties(component);
return component;
}
// Tag tree navigation
/**
* <p>Locate and return the nearest enclosing {@link UIComponentTag}
* if any; otherwise, return <code>null</code>.</p>
*
* @param context <code>PageContext</code> for the current page
*/
public static UIComponentTag getParentUIComponentTag(PageContext context) {
UIComponentClassicTagBase result =
getParentUIComponentClassicTagBase(context);
if (!(result instanceof UIComponentTag)) {
return new UIComponentTagAdapter(result);
}
return ((UIComponentTag) result);
}
// --------------------------------------------------------- Private Classes
/**
* This adatper exposes a UIComponentClassicTagBase as a UIComponentTag
* for 1.1 component libraries that rely on UIComponent.getParentUIComponentTag().
*
* This will work for most use cases, but there are probably some edge
* cases out there that we're not aware of.
*/
private static class UIComponentTagAdapter extends UIComponentTag {
UIComponentClassicTagBase classicDelegate;
public UIComponentTagAdapter(UIComponentClassicTagBase classicDelegate) {
this.classicDelegate = classicDelegate;
}
public String getComponentType() {
return classicDelegate.getComponentType();
}
public String getRendererType() {
return classicDelegate.getRendererType();
}
public int doStartTag() throws JspException {
throw new IllegalStateException();
}
public int doEndTag() throws JspException {
throw new IllegalStateException();
}
public UIComponent getComponentInstance() {
return classicDelegate.getComponentInstance();
}
public boolean getCreated() {
return classicDelegate.getCreated();
}
public Tag getParent() {
return classicDelegate.getParent();
}
public void setParent(Tag parent) {
throw new IllegalStateException();
}
}
}