jakarta.faces.component.UIGraphic Maven / Gradle / Ivy
Show all versions of jakarta.faces Show documentation
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.component;
import jakarta.el.ValueExpression;
/**
*
* UIGraphic is a {@link UIComponent} that displays a graphical image to the user. The user cannot
* manipulate this component; it is for display purposes only.
*
*
*
* By default, the rendererType property must be set to "jakarta.faces.Image". This value can
* be changed by calling the setRendererType() method.
*
*/
public class UIGraphic extends UIComponentBase {
/**
* Properties that are tracked by state saving.
*/
enum PropertyKeys {
/**
*
* The local value of this {@link UIComponent}.
*
*/
value
}
// ------------------------------------------------------ Manifest Constants
/**
*
* The standard component type for this component.
*
*/
public static final String COMPONENT_TYPE = "jakarta.faces.Graphic";
/**
*
* The standard component family for this component.
*
*/
public static final String COMPONENT_FAMILY = "jakarta.faces.Graphic";
// ------------------------------------------------------------ Constructors
/**
*
* Create a new {@link UIGraphic} instance with default property values.
*
*/
public UIGraphic() {
super();
setRendererType("jakarta.faces.Image");
}
// ------------------------------------------------------ Instance Variables
// private Object value = null;
// -------------------------------------------------------------- Properties
@Override
public String getFamily() {
return COMPONENT_FAMILY;
}
/**
*
* Return the image URL for this {@link UIGraphic}. This method is a typesafe alias for getValue().
*
*
* @return the url.
*/
public String getUrl() {
return (String) getValue();
}
/**
*
* Set the image URL for this {@link UIGraphic}. This method is a typesafe alias for setValue().
*
*
* @param url The new image URL
*/
public void setUrl(String url) {
setValue(url);
}
/**
*
* Returns the value property of the UIGraphic. This will typically be rendered as an URL.
*
*
* @return the value.
*/
public Object getValue() {
return getStateHelper().eval(PropertyKeys.value);
}
/**
*
* Sets the value property of the UIGraphic. This will typically be rendered as an URL.
*
*
* @param value the new value
*/
public void setValue(Object value) {
getStateHelper().put(PropertyKeys.value, value);
}
// ---------------------------------------------------------------- Bindings
/**
*
* Return any {@link ValueExpression} set for value if a {@link ValueExpression} for url is
* requested; otherwise, perform the default superclass processing for this method.
*
*
* @param name Name of the attribute or property for which to retrieve a {@link ValueExpression}
* @return the value expression, or null.
* @throws NullPointerException if name is null
* @since 1.2
*/
@Override
public ValueExpression getValueExpression(String name) {
if ("url".equals(name)) {
return super.getValueExpression("value");
} else {
return super.getValueExpression(name);
}
}
/**
*
* Store any {@link ValueExpression} specified for url under value instead; otherwise, perform
* the default superclass processing for this method.
*
*
* @param name Name of the attribute or property for which to set a {@link ValueExpression}
* @param binding The {@link ValueExpression} to set, or null to remove any currently set
* {@link ValueExpression}
*
* @throws NullPointerException if name is null
* @since 1.2
*/
@Override
public void setValueExpression(String name, ValueExpression binding) {
if ("url".equals(name)) {
super.setValueExpression("value", binding);
} else {
super.setValueExpression(name, binding);
}
}
// ----------------------------------------------------- StateHolder Methods
}