ASTBlock


1   /*
2    * Copyright 2002-2006 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.commons.jexl.parser;
18  
19  import org.apache.commons.jexl.JexlContext;
20  
21  /**
22   * { code }, a block of statements enclosed in curly braces.
23   * 
24   * @author Dion Gillard
25   * 
26   */
27  public class ASTBlock extends SimpleNode {
28      /**
29       * Create the node given an id.
30       * 
31       * @param id node id.
32       */
33      public ASTBlock(int id) {
34          super(id);
35      }
36  
37      /**
38       * Create a node with the given parser and id.
39       * 
40       * @param p a parser.
41       * @param id node id.
42       */
43      public ASTBlock(Parser p, int id) {
44          super(p, id);
45      }
46  
47      /** {@inheritDoc} */
48      public Object   jjtAccept(ParserVisitor visitor, Object   data) {
49          return visitor.visit(this, data);
50      }
51  
52      /**
53       * @return the value of the block. Execute all statements inside and return
54       *         the value of the last.
55       * @param context the {@link JexlContext} to execute against.
56       * @throws Exception on any error.
57       */
58      public Object   value(JexlContext context) throws Exception   {
59          int numChildren = jjtGetNumChildren();
60          Object   result = null;
61          for (int i = 0; i < numChildren; i++) {
62              result = ((SimpleNode) jjtGetChild(i)).value(context);
63          }
64          return result;
65      }
66  
67  }
68
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