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.scxml2.env.xpath;
18
19 import org.apache.commons.jxpath.Variables;
20 import org.apache.commons.scxml2.Context;
21
22 /**
23 * JXPath Variables mapping for SCXML Context
24 */
25 public class ContextVariables implements Variables {
26
27 private final Context ctx;
28
29 public ContextVariables(Context ctx) {
30 this.ctx = ctx;
31 }
32
33 @Override
34 public boolean isDeclaredVariable(final String varName) {
35 return ctx.has(varName);
36 }
37
38 @Override
39 public Object getVariable(final String varName) {
40 return ctx.get(varName);
41 }
42
43 @Override
44 public void declareVariable(final String varName, final Object value) {
45 ctx.set(varName, value);
46 }
47
48 @Override
49 public void undeclareVariable(final String varName) {
50 if (ctx.has(varName)) {
51 Context cctx = ctx;
52 while (!cctx.hasLocal(varName)) {
53 cctx = cctx.getParent();
54 if (cctx == null) {
55 return;
56 }
57 }
58 cctx.getVars().remove(varName);
59 }
60 }
61 }