com.sun.faces.facelets.tag.composite.AttributeHandler Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jakarta.faces Show documentation
Show all versions of jakarta.faces Show documentation
EE4J Compatible Implementation for Jakarta Faces API
/*
* 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 com.sun.faces.facelets.tag.composite;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.faces.facelets.tag.TagHandlerImpl;
import com.sun.faces.facelets.util.ReflectionUtil;
import com.sun.faces.util.FacesLogger;
import jakarta.el.ELContext;
import jakarta.el.ValueExpression;
import jakarta.faces.component.UIComponent;
import jakarta.faces.context.FacesContext;
import jakarta.faces.view.facelets.ComponentHandler;
import jakarta.faces.view.facelets.FaceletContext;
import jakarta.faces.view.facelets.TagAttribute;
import jakarta.faces.view.facelets.TagAttributeException;
import jakarta.faces.view.facelets.TagConfig;
import jakarta.faces.view.facelets.TagException;
public class AttributeHandler extends TagHandlerImpl {
private final Logger LOGGER = FacesLogger.TAGLIB.getLogger();
private static final String[] COMPOSITE_ATTRIBUTE_ATTRIBUTES = { "required", "targets", "targetAttributeName", "default", "displayName", "preferred",
"hidden", "expert", "shortDescription", "method-signature", "type",
};
private static final PropertyHandlerManager ATTRIBUTE_MANAGER = PropertyHandlerManager.getInstance(COMPOSITE_ATTRIBUTE_ATTRIBUTES);
private TagAttribute name;
public AttributeHandler(TagConfig config) {
super(config);
name = getRequiredAttribute("name");
}
@Override
public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
// only process if it's been created
if (null == parent || null == (parent = parent.getParent()) || !ComponentHandler.isNew(parent)) {
return;
}
Map attrs = parent.getAttributes();
CompositeComponentBeanInfo componentBeanInfo = (CompositeComponentBeanInfo) attrs.get(UIComponent.BEANINFO_KEY);
assert null != componentBeanInfo;
List declaredAttributes = componentBeanInfo.getPropertyDescriptorsList();
// Get the value of required the name propertyDescriptor
ValueExpression ve = name.getValueExpression(ctx, String.class);
String strValue = (String) ve.getValue(ctx);
// Search the propertyDescriptors for one for this attribute
for (PropertyDescriptor cur : declaredAttributes) {
if (strValue.endsWith(cur.getName())) {
// If we have a match, no need to waste time
// duplicating and replacing it.
return;
}
}
PropertyDescriptor propertyDescriptor;
try {
propertyDescriptor = new CCAttributePropertyDescriptor(strValue, null, null);
declaredAttributes.add(propertyDescriptor);
} catch (IntrospectionException ex) {
throw new TagException(tag, "Unable to create property descriptor for property " + strValue, ex);
}
TagAttribute defaultTagAttribute = null;
PropertyHandler defaultHandler = null;
for (TagAttribute tagAttribute : tag.getAttributes().getAll()) {
String attributeName = tagAttribute.getLocalName();
if ("default".equals(attributeName)) {
// store the TagAttribute and the PropertyHandler for later
// execution, as the handler for the default-attribute requires,
// that the PropertyHandler for 'type' - if it exists - has been
// applied first.
defaultTagAttribute = tagAttribute;
defaultHandler = ATTRIBUTE_MANAGER.getHandler(ctx, "default");
} else {
PropertyHandler handler = ATTRIBUTE_MANAGER.getHandler(ctx, attributeName);
if (handler != null) {
handler.apply(ctx, attributeName, propertyDescriptor, tagAttribute);
}
}
}
if (defaultHandler != null) {
// If the 'default'-attribute of cc:attribute was set, apply the
// previously stored PropertyHandler (see above) now, as now it is
// guaranteed that if a 'type'-attribute existed, that its handler
// was already applied
try {
defaultHandler.apply(ctx, "default", propertyDescriptor, defaultTagAttribute);
} catch (IllegalArgumentException ex) {
// If the type (according to the type-attribute) can not be
// found, the DefaultPropertyHandler will wrapp the
// ClassNotFoundException into an IllegalArgumentException,
// which is unwrapped into a TagException here.
throw new TagException(tag, "'type' could not be resolved: " + ex.getCause(), ex.getCause());
}
}
nextHandler.apply(ctx, parent);
}
private class CCAttributePropertyDescriptor extends PropertyDescriptor {
public CCAttributePropertyDescriptor(String propertyName, Method readMethod, Method writeMethod) throws IntrospectionException {
super(propertyName, readMethod, writeMethod);
}
@Override
public Object getValue(String attributeName) {
Object result = super.getValue(attributeName);
if ("type".equals(attributeName)) {
if (null != result && !(result instanceof Class)) {
FacesContext context = FacesContext.getCurrentInstance();
ELContext elContext = context.getELContext();
String classStr = (String) ((ValueExpression) result).getValue(elContext);
if (null != classStr) {
try {
result = ReflectionUtil.forName(classStr);
setValue(attributeName, result);
} catch (ClassNotFoundException ex) {
classStr = "java.lang." + classStr;
boolean throwException = false;
try {
result = ReflectionUtil.forName(classStr);
setValue(attributeName, result);
} catch (ClassNotFoundException ex2) {
throwException = true;
}
if (throwException) {
String message = "Unable to obtain class for " + classStr;
if (LOGGER.isLoggable(Level.INFO)) {
LOGGER.log(Level.INFO, message, ex);
}
throw new TagAttributeException(tag, name, message, ex);
}
}
}
}
}
return result;
}
}
}