Java > Open Source Codes > jfun > yan > xml > UID


1   package jfun.yan.xml;
2   
3   import jfun.util.Misc;
4   
5   /**
6    * Unique id for a component. This id is guaranteed to be unique
7    * across multiple modules. 
8    * <p>
9    * @author Ben Yu
10   * Dec 12, 2005 2:58:23 PM
11   */
12  public class UID implements java.io.Serializable  {
13    private final Object   module_id;
14    private final Object   id;
15    private final int evaluation_seq;
16    private final int declaration_seq;
17    /**
18     * To create a UID object.
19     * @param module_id the module id.
20     * @param decl_seq the declaration sequence in the enclosing tag.
21     * @param eval_seq the evaluation sequence.
22     * @param id the id of the component within the module.
23     */
24    public UID(Object   module_id, int decl_seq, int eval_seq, Object   id) {
25      this.id = id;
26      this.evaluation_seq = eval_seq;
27      this.module_id = module_id;
28      this.declaration_seq = decl_seq;
29    }
30    /**
31     * Get the id of the component within the containing module.
32     */
33    public Object   getComponentId() {
34      return id;
35    }
36    /**
37     * Get the id of the containing module.
38     */
39    public Object   getModuleId() {
40      return module_id;
41    }
42    
43    /**
44     * Get the sequence number in the order of tag evaluation.
45     */
46    public int getEvaluationSequence(){
47      return evaluation_seq;
48    }
49    /**
50     * Get the sequence number in the order of tag declaration.
51     */
52    public int getDeclarationSequence(){
53      return declaration_seq;
54    }
55    public boolean equals(Object   obj) {
56      if(obj instanceof UID){
57        final UID other = (UID)obj;
58        return declaration_seq==other.declaration_seq && evaluation_seq == other.evaluation_seq && Misc.equals(module_id, other.module_id);
59      }
60      else return false;
61    }
62    public int hashCode() {
63      return Misc.hashcode(module_id)*31+evaluation_seq;
64    }
65    public String   toString() {
66      StringBuffer   buf = new StringBuffer  ();
67      buf.append(module_id).append('.');
68      if(id!=null){
69        buf.append(id);
70      }
71      else{
72        buf.append('#').append(declaration_seq);
73      }
74      return buf.toString();
75    }
76    
77  }
78
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