001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.jexl2;
018
019 /**
020 * A readonly context wrapper.
021 * @since 2.1
022 */
023 public final class ReadonlyContext implements JexlContext {
024 /** The wrapped context. */
025 private final JexlContext wrapped;
026
027 /**
028 * Creates a new readonly context.
029 * @param context the wrapped context
030 */
031 public ReadonlyContext(JexlContext context) {
032 wrapped = context;
033 }
034
035 /** {@inheritDoc} */
036 public Object get(String name) {
037 return wrapped.get(name);
038 }
039
040 /**
041 * Will throw an UnsupportedOperationException when called; the JexlEngine deals with it appropriately.
042 * @param name the unused variable name
043 * @param value the unused variable value
044 */
045 public void set(String name, Object value) {
046 throw new UnsupportedOperationException("Not supported.");
047 }
048
049 /** {@inheritDoc} */
050 public boolean has(String name) {
051 return wrapped.has(name);
052 }
053 }