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1   package org.apache.velocity.runtime.parser.node;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.    
20   */
21  
22  import java.util.LinkedHashMap;
23  import java.util.Map;
24  
25  import org.apache.velocity.context.InternalContextAdapter;
26  import org.apache.velocity.exception.MethodInvocationException;
27  import org.apache.velocity.runtime.parser.Parser;
28  
29  /**
30   * AST Node for creating a map / dictionary.
31   *
32   * This class was originally generated from Parset.jjt.
33   *
34   * @version $Id: ASTMap.java 928475 2010-03-28 18:54:55Z nbubna $
35   * @since 1.5
36   */
37  public class ASTMap extends SimpleNode
38  {
39      /**
40       * @param id
41       */
42      public ASTMap(int id)
43      {
44          super(id);
45      }
46  
47      /**
48       * @param p
49       * @param id
50       */
51      public ASTMap(Parser p, int id)
52      {
53          super(p, id);
54      }
55  
56      /**
57       * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
58       */
59      public Object jjtAccept(ParserVisitor visitor, Object data)
60      {
61          return visitor.visit(this, data);
62      }
63  
64      /**
65       * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
66       */
67      public Object value(InternalContextAdapter context)
68          throws MethodInvocationException
69      {
70          int size = jjtGetNumChildren();
71  
72          Map objectMap = new LinkedHashMap();
73  
74          for (int i = 0; i < size; i += 2)
75          {
76              SimpleNode keyNode = (SimpleNode) jjtGetChild(i);
77              SimpleNode valueNode = (SimpleNode) jjtGetChild(i+1);
78  
79              Object key = (keyNode == null ? null : keyNode.value(context));
80              Object value = (valueNode == null ? null : valueNode.value(context));
81  
82              objectMap.put(key, value);
83          }
84  
85          return objectMap;
86      }
87  }