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products/Sources/formale Sprachen/Java/Tomcat/java/jakarta/servlet/jsp/el/ (Apache Software Stiftung Version 11.0^©) Datei vom 10.10.2023 mit Größe 4 kB

Quelle NotFoundELResolver.java Sprache: JAVA

/*
* 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.beans.FeatureDescriptor;
import java.util.Collections;
import java.util.Iterator;
import java.util.Objects;
import java.util.ResourceBundle;

import jakarta.el.ELContext;
import jakarta.el.ELResolver;
import jakarta.el.PropertyNotFoundException;

/**
* The final resolver of the Jakarta Server Pages ELResolver chain. It always resolves the requested value, returning
* {@code null} when it does so.
*
* @since JSP 3.1
*/
public class NotFoundELResolver extends ELResolver {

 private static final String LSTRING_FILE = "jakarta.servlet.jsp.LocalStrings";
 private static final ResourceBundle lStrings = ResourceBundle.getBundle(LSTRING_FILE);

 /**
 * Default constructor.
 */
 public NotFoundELResolver() {
 super();
 }

 /**
 * {@inheritDoc}
 * 
 * Resolves the property and always returns {@code null} unless the provided context contains a Boolean object with
 * value {@code Boolean.TRUE} as the value associated with the key
 * {@code jakarta.servlet.jsp.el.NotFoundELResolver.class} in which case an exception is thrown. This is to support
 * implementation of the {@code errorOnELNotFound} page/tag directive.
 *
 * @return Always {@code null}
 *
 * @throws PropertyNotFoundException if the provided context contains a Boolean object with value
 * {@code Boolean.TRUE} as the value associated with the key
 * {@code jakarta.servlet.jsp.el.NotFoundELResolver.class}
 */
 @Override
 public Object getValue(ELContext context, Object base, Object property) {
 Objects.requireNonNull(context);

 Object obj = context.getContext(this.getClass());
 if (obj instanceof Boolean && ((Boolean) obj).booleanValue()) {
 throw new PropertyNotFoundException(
 lStrings.getString("el.unknown.identifier") + " [" + property.toString() + "]");
 }

 context.setPropertyResolved(base, property);
 return null;
 }

 /**
 * {@inheritDoc}
 * 
 * In normal usage, {@link ScopedAttributeELResolver} will have responded.
 *
 * @return Always {@code null}
 */
 @Override
 public Class<Object> getType(ELContext context, Object base, Object property) {
 Objects.requireNonNull(context);
 return null;
 }

 /**
 * {@inheritDoc}
 * 
 * No-op. In normal usage, {@link ScopedAttributeELResolver} will have responded.
 */
 @Override
 public void setValue(ELContext context, Object base, Object property, Object value) {
 Objects.requireNonNull(context);
 }

 /**
 * {@inheritDoc}
 * 
 * In normal usage, {@link ScopedAttributeELResolver} will have responded.
 *
 * @return Always {@code false}
 */
 @Override
 public boolean isReadOnly(ELContext context, Object base, Object property) {
 Objects.requireNonNull(context);
 return false;
 }

 @Deprecated(forRemoval = true, since = "JSP 3.1")
 @Override
 public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
 return Collections.emptyIterator();
 }

 /**
 * {@inheritDoc}
 * 
 * In normal usage, {@link ScopedAttributeELResolver} will have responded.
 *
 * @return Always {@code null}
 */
 @Override
 public Class<String> getCommonPropertyType(ELContext context, Object base) {
 return null;
 }
}

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