javax.faces.component.UIParameter Maven / Gradle / Ivy
/*
* $Id: UIParameter.java,v 1.30 2007/04/27 22:00:05 ofung 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.component;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
/**
* UIParameter is a {@link UIComponent} that represents
* an optionally named configuration parameter for a parent component.
*
* Parent components should retrieve the value of a parameter by calling
* getValue(). In this way, the parameter value can be set
* directly on the component (via setValue()), or retrieved
* indirectly via the value binding expression.
*
* In some scenarios, it is necessary to provide a parameter name, in
* addition to the parameter value that is accessible via the
* getValue() method.
* {@link javax.faces.render.Renderer}s that support parameter names on their
* nested {@link UIParameter} child components should document
* their use of this property.
*/
public class UIParameter extends UIComponentBase {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.Parameter";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.Parameter";
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UIParameter} instance with default property
* values.
*/
public UIParameter() {
super();
setRendererType(null);
}
// ------------------------------------------------------ Instance Variables
private String name = null;
private Object value = null;
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
/**
* Return the optional parameter name for this parameter.
*/
public String getName() {
if (this.name != null) {
return (this.name);
}
ValueExpression ve = getValueExpression("name");
if (ve != null) {
try {
return ((String) ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
/**
* Set the optional parameter name for this parameter.
*
* @param name The new parameter name,
* or null for no name
*/
public void setName(String name) {
this.name = name;
}
/**
* Returns the value property of the
* UIParameter.
*/
public Object getValue() {
if (this.value != null) {
return (this.value);
}
ValueExpression ve = getValueExpression("value");
if (ve != null) {
try {
return (ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
/**
* Sets the value property of the\
* UIParameter.
*
* @param value the new value
*/
public void setValue(Object value) {
this.value = value;
}
// ----------------------------------------------------- StateHolder Methods
private Object[] values;
public Object saveState(FacesContext context) {
if (values == null) {
values = new Object[3];
}
values[0] = super.saveState(context);
values[1] = name;
values[2] = value;
return (values);
}
public void restoreState(FacesContext context, Object state) {
values = (Object[]) state;
super.restoreState(context, values[0]);
name = (String) values[1];
value = values[2];
}
}