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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 org.apache.velocity.context.InternalContextAdapter;
23  import org.apache.velocity.exception.MethodInvocationException;
24  import org.apache.velocity.exception.VelocityException;
25  import org.apache.velocity.runtime.RuntimeConstants;
26  import org.apache.velocity.runtime.log.Log;
27  import org.apache.velocity.runtime.parser.Parser;
28  import org.apache.velocity.util.TemplateNumber;
29  
30  
31  /**
32   * Handles arg1 &gt;= arg2<br><br>
33   *
34   * Only subclasses of Number can be compared.<br><br>
35   *
36   * Please look at the Parser.jjt file which is
37   * what controls the generation of this class.
38   *
39   * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
40   * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
41   */
42  public class ASTGENode extends SimpleNode
43  {
44      /**
45       * @param id
46       */
47      public ASTGENode(int id)
48      {
49          super(id);
50      }
51  
52      /**
53       * @param p
54       * @param id
55       */
56      public ASTGENode(Parser p, int id)
57      {
58          super(p, id);
59      }
60  
61  
62      /**
63       * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
64       */
65      public Object jjtAccept(ParserVisitor visitor, Object data)
66      {
67          return visitor.visit(this, data);
68      }
69  
70      /**
71       * @see org.apache.velocity.runtime.parser.node.SimpleNode#evaluate(org.apache.velocity.context.InternalContextAdapter)
72       */
73      public boolean evaluate( InternalContextAdapter context)
74          throws MethodInvocationException
75      {
76          /*
77           *  get the two args
78           */
79  
80          Object left = jjtGetChild(0).value( context );
81          Object right = jjtGetChild(1).value( context );
82  
83          /*
84           *  if either is null, lets log and bail
85           */
86  
87          if (left == null || right == null)
88          {
89              String msg = (left == null ? "Left" : "Right")
90                             + " side ("
91                             + jjtGetChild( (left == null? 0 : 1) ).literal()
92                             + ") of '>=' operation has null value at "
93                             + Log.formatFileString(this);
94  
95              if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
96              {
97                throw new VelocityException(msg);
98              }
99              
100             log.error(msg);
101             return false;
102         }
103 
104 
105         /*
106          *  convert to Number if applicable
107          */
108         if (left instanceof TemplateNumber)
109         {
110            left = ( (TemplateNumber) left).getAsNumber();
111         }
112         if (right instanceof TemplateNumber)
113         {
114            right = ( (TemplateNumber) right).getAsNumber();
115         }
116 
117         /*
118          *  Only compare Numbers
119          */
120 
121         if ( !( left instanceof Number )  || !( right instanceof Number ))
122         {
123             String msg = (!(left instanceof Number) ? "Left" : "Right")
124                            + " side of '>=' operation is not a Number at "
125                            + Log.formatFileString(this);
126 
127             if (rsvc.getBoolean(RuntimeConstants.RUNTIME_REFERENCES_STRICT, false))
128             {
129               throw new VelocityException(msg);
130             }
131 
132             log.error(msg);
133             return false;
134         }
135 
136        return MathUtils.compare ( (Number)left,(Number)right) >= 0;
137 
138     }
139 
140     /**
141      * @see org.apache.velocity.runtime.parser.node.SimpleNode#value(org.apache.velocity.context.InternalContextAdapter)
142      */
143     public Object value(InternalContextAdapter context)
144         throws MethodInvocationException
145     {
146         boolean val = evaluate(context);
147 
148         return val ? Boolean.TRUE : Boolean.FALSE;
149     }
150 
151 }