Trigger


1   package org.objectweb.kilim.description;
2   
3   import java.util.ArrayList  ;
4   import java.util.List  ;
5   import java.util.Iterator  ;
6   
7   import org.objectweb.kilim.KilimException;
8   
9   /**
10   * @author horn
11   */
12  
13  public abstract class Trigger extends TemplateElementImpl {
14      /** strings to be used to print event idents */
15      public static final String  [] EVENT_TYPE_NAME = { "Unbind" , "Bind"};
16      
17      /** integer constants used to identify bind events */
18      public static final int BIND = 1;
19      /** integer constants used to identify unbind events */
20      public static final int UNBIND = 2;
21      
22      private String   sourceName;
23      private int kind;
24      private List   transformers;
25          
26      protected Trigger(String   aName, int aKind) {
27          sourceName = aName;
28          kind = aKind;
29      }
30          
31      /**
32       * returns the kind of the trigger event. It is one of TRIGGER.BIND or' TRIGGER.UNBIND.
33       * @return int
34       */
35      public int getEventKind() {
36          return kind;
37      }
38      
39      /**
40       * @see org.objectweb.kilim.description.Trigger#getName()
41       */
42      public String   getSourceName() {
43          return sourceName;
44      }
45          
46      /**
47       * @see org.objectweb.kilim.description.Trigger#getName()
48       */
49      public void setSourceName(String   aName) {
50          sourceName = aName;
51      }
52  
53      /**
54       * @see org.objectweb.kilim.description.Trigger#addTransformer(Transformer)
55       */
56      public void addTransformer(BasicElement aTransformer) throws KilimException {
57          if (aTransformer == null) {
58              throw new KilimException("illegal null value for transformer when added to a trigger in template " + getContainingTemplate().getName());
59          }
60          
61          if (!aTransformer.performsAction()) {
62              //throw new KilimException("attempt to add a non transformer to a trigger");
63          }   
64          
65          String   name = null;
66          
67          if (transformers == null) {
68              transformers = new ArrayList  ();
69          }
70  
71          if (transformers.contains(aTransformer)) {
72                  throw new KilimException("attempt to add an already defined transformer in a trigger in template " + getContainingTemplate().getName());
73          }
74          transformers.add(aTransformer);
75      }
76      
77      /**
78       * @see org.objectweb.kilim.description.Trigger#removeTransformer(String)
79       */
80      public void removeTransformer(BasicElement aTransformer) throws KilimException {
81          if (aTransformer == null) {
82              throw new KilimException("illegal null value for transformer when removed to a trigger in template " + getContainingTemplate().getName());
83          }
84          
85          if (!aTransformer.performsAction()) {
86              throw new KilimException("attempt to remove a non transformer from a trigger in template " + getContainingTemplate().getName());
87          }
88          
89          if (transformers == null) {
90              throw new KilimException("attempt to remove a transformer from an empty trigger in template " + getContainingTemplate().getName());
91          }
92  
93          transformers.remove(aTransformer);
94      }
95          
96      /**
97       * @see org.objectweb.kilim.description.Trigger#getTransformers()
98       */
99      public Iterator   getTransformers() {
100         if (transformers == null) {
101             return KILIM.EMPTY_ITERATOR;
102         }
103         return transformers.iterator();
104     }
105 }
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