ParameterizedTagSupport


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.webwork.views.jsp;
6   
7   import org.apache.commons.logging.Log;
8   import org.apache.commons.logging.LogFactory;
9   
10  import java.util.HashMap  ;
11  import java.util.Map  ;
12  
13  
14  /**
15   * Created by IntelliJ IDEA.
16   * User: jcarreira
17   * Date: Oct 16, 2003
18   * Time: 11:00:38 PM
19   * To change this template use Options | File Templates.
20   */
21  public abstract class ParameterizedTagSupport extends WebWorkTagSupport implements ParamTag.Parametric {
22      //~ Static fields/initializers /////////////////////////////////////////////
23  
24      final protected static Log log = LogFactory.getLog(ParameterizedTagSupport.class);
25  
26      //~ Instance fields ////////////////////////////////////////////////////////
27  
28      Map   params;
29  
30      //~ Methods ////////////////////////////////////////////////////////////////
31  
32      public Map   getParameters() {
33          if (params == null) {
34              params = new HashMap  ();
35          }
36  
37          return params;
38      }
39  
40      public void addParameter(String   key, Object   value) {
41          if (key != null) {
42              Map   myParams = getParameters();
43  
44              if (value == null) {
45                  myParams.remove(key);
46              } else {
47                  params.put(key, value);
48              }
49          }
50      }
51  
52      /**
53       * Resets the attributes of this tag so that the tag may be reused.  As a general rule, only properties that are
54       * not specified as an attribute or properties that are derived need to be reset.  Examples of this would include
55       * the parameters Map in ParameterizedTag and the namespace in the ActionTag (which can be a derived value).
56       * <p />
57       * This should be the last thing called as part of the doEndTag
58       */
59      protected void reset() {
60          this.getParameters().clear();
61      }
62  }
63
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