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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.jexl3;
18  
19  import org.apache.commons.jexl3.annotations.NoJexl;
20  
21  /**
22   * A readonly context wrapper.
23   * @since 3.0
24   */
25  public final class ReadonlyContext implements JexlContext, JexlContext.OptionsHandle {
26      /** The wrapped context. */
27      private final JexlContext wrapped;
28      /** The wrapped engine options. */
29      private final JexlOptions options;
30  
31      /**
32       * Creates a new readonly context.
33       * @param context the wrapped context
34       * @param eopts the engine evaluation options
35       */
36      public ReadonlyContext(final JexlContext context, final JexlOptions eopts) {
37          wrapped = context;
38          options = eopts;
39      }
40  
41      @Override
42      @NoJexl
43      public Object get(final String name) {
44          return wrapped.get(name);
45      }
46  
47      /**
48       * Will throw an UnsupportedOperationException when called; the JexlEngine deals with it appropriately.
49       * @param name the unused variable name
50       * @param value the unused variable value
51       */
52      @Override
53      @NoJexl
54      public void set(final String name, final Object value) {
55          throw new UnsupportedOperationException("Not supported.");
56      }
57  
58      @Override
59      @NoJexl
60      public boolean has(final String name) {
61          return wrapped.has(name);
62      }
63  
64      @Override
65      @NoJexl
66      public JexlOptions getEngineOptions() {
67          return options;
68      }
69  }