/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jakarta.servlet.jsp.el;
import java.util.Objects;
import jakarta.el.ELContext;
import jakarta.el.ELResolver;
import jakarta.servlet.jsp.JspContext;
import jakarta.servlet.jsp.PageContext;
/**
* An ELResolver for working with JSP scoped attributes which may have page, request, session or application scope.
*
* @since JSP 2.1
*/
public class ScopedAttributeELResolver extends ELResolver {
/**
* Default constructor.
*/
public ScopedAttributeELResolver() {
super();
}
@Override
public Object getValue(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
Object result = null;
if (base == null) {
if (property != null) {
String key = property.toString();
PageContext page = (PageContext) context.getContext(JspContext.class);
result = page.findAttribute(key);
if (result != null) {
context.setPropertyResolved(null, property);
}
}
}
return result;
}
@Override
public Class<Object> getType(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base == null) {
context.setPropertyResolved(null, property);
return Object.class;
}
return null;
}
@Override
public void setValue(ELContext context, Object base, Object property, Object value) {
Objects.requireNonNull(context);
if (base == null) {
context.setPropertyResolved(null, property);
if (property != null) {
String key = property.toString();
PageContext page = (PageContext) context.getContext(JspContext.class);
int scope = page.getAttributesScope(key);
if (scope != 0) {
page.setAttribute(key, value, scope);
} else {
page.setAttribute(key, value);
}
}
}
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base == null) {
context.setPropertyResolved(null, property);
}
return false;
}
@Override
public Class<String> getCommonPropertyType(ELContext context, Object base) {
if (base == null) {
return String.class;
}
return null;
}
}