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 * https://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
18 package org.apache.commons.jexl3;
19
20 import java.util.HashMap;
21 import java.util.Map;
22
23 /**
24 * Wraps a map in a context.
25 * <p>Each entry in the map is considered a variable name, value pair.</p>
26 */
27 public class MapContext implements JexlContext {
28
29 /**
30 * The wrapped variable map.
31 */
32 private final Map<String, Object> map;
33
34 /**
35 * Creates a MapContext on an automatically allocated underlying HashMap.
36 */
37 public MapContext() {
38 this(null);
39 }
40
41 /**
42 * Creates a MapContext wrapping an existing user provided map.
43 *
44 * @param vars the variable map
45 */
46 public MapContext(final Map<String, Object> vars) {
47 map = vars == null ? new HashMap<>() : vars;
48 }
49
50 /**
51 * Clears all variables.
52 */
53 public void clear() {
54 map.clear();
55 }
56
57 @Override
58 public Object get(final String name) {
59 return map.get(name);
60 }
61
62 @Override
63 public boolean has(final String name) {
64 return map.containsKey(name);
65 }
66
67 @Override
68 public void set(final String name, final Object value) {
69 map.put(name, value);
70 }
71 }