1   package org.apache.velocity.test;
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.io.IOException;
23  import java.io.StringWriter;
24  
25  import junit.framework.TestCase;
26  
27  import org.apache.velocity.VelocityContext;
28  import org.apache.velocity.app.Velocity;
29  import org.apache.velocity.exception.MethodInvocationException;
30  import org.apache.velocity.exception.ParseErrorException;
31  import org.apache.velocity.exception.ResourceNotFoundException;
32  import org.apache.velocity.util.introspection.IntrospectionCacheData;
33  
34  /**
35   * Checks that arrays are cached correctly in the Introspector.
36   *
37   * @author <a href="Alexey Pachenko">alex+news@olmisoft.com</a>
38   * @version $Id: IntrospectionCacheDataTestCase.java 463298 2006-10-12 16:10:32Z henning $
39   */
40  public class IntrospectionCacheDataTestCase extends TestCase 
41  {
42      
43      private static class CacheHitCountingVelocityContext extends VelocityContext 
44      {
45          public int cacheHit = 0;
46          
47          public IntrospectionCacheData icacheGet(Object key) 
48          {
49              final IntrospectionCacheData result = super.icacheGet(key);
50              if (result != null) {
51                  ++cacheHit;
52              }
53              return result;
54          }
55          
56      }
57      
58      public void testCache() throws ParseErrorException, MethodInvocationException, 
59      ResourceNotFoundException, IOException 
60      {
61          CacheHitCountingVelocityContext context = new CacheHitCountingVelocityContext();
62          context.put("this", this);
63          StringWriter w = new StringWriter();
64          Velocity.evaluate(context, w, "test", "$this.exec('a')$this.exec('b')");
65          assertEquals("[a][b]", w.toString());
66          assertTrue(context.cacheHit > 0);
67      }
68      
69      
70      /** 
71       * For use when acting as a context reference.
72       * 
73       * @param value
74       * @return
75       */
76      public String exec(String value) 
77      {
78          return "[" + value + "]";
79      }
80      
81  }