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Java > Open Source Codes > java_cup > action_part


1
2 package java_cup;
3
4 /**
5  * This class represents a part of a production which contains an
6  * action. These are eventually eliminated from productions and converted
7  * to trailing actions by factoring out with a production that derives the
8  * empty string (and ends with this action).
9  *
10  * @see java_cup.production
11  * @version last update: 11/25/95
12  * @author Scott Hudson
13  */

14
15 public class action_part extends production_part {
16
17   /*-----------------------------------------------------------*/
18   /*--- Constructors ------------------------------------------*/
19   /*-----------------------------------------------------------*/
20
21   /** Simple constructor.
22    * @param code_str string containing the actual user code.
23    */

24   public action_part(String JavaDoc code_str)
25     {
26       super(/* never have a label on code */null);
27       _code_string = code_str;
28     }
29
30   /*-----------------------------------------------------------*/
31   /*--- (Access to) Instance Variables ------------------------*/
32   /*-----------------------------------------------------------*/
33
34   /** String containing code for the action in question. */
35   protected String JavaDoc _code_string;
36
37   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
38
39   /** String containing code for the action in question. */
40   public String JavaDoc code_string() {return _code_string;}
41
42   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
43
44   /** Set the code string. */
45   public void set_code_string(String JavaDoc new_str) {_code_string = new_str;}
46
47   /*-----------------------------------------------------------*/
48   /*--- General Methods ---------------------------------------*/
49   /*-----------------------------------------------------------*/
50
51   /** Override to report this object as an action. */
52   public boolean is_action() { return true; }
53
54   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
55
56   /** Equality comparison for properly typed object. */
57   public boolean equals(action_part other)
58     {
59       /* compare the strings */
60       return other != null && super.equals(other) &&
61          other.code_string().equals(code_string());
62     }
63
64   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
65
66   /** Generic equality comparison. */
67   public boolean equals(Object JavaDoc other)
68     {
69       if (!(other instanceof action_part))
70     return false;
71       else
72     return equals((action_part)other);
73     }
74
75   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
76
77   /** Produce a hash code. */
78   public int hashCode()
79     {
80       return super.hashCode() ^
81          (code_string()==null ? 0 : code_string().hashCode());
82     }
83
84   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
85
86   /** Convert to a string. */
87   public String JavaDoc toString()
88     {
89       return super.toString() + "{" + code_string() + "}";
90     }
91
92   /*-----------------------------------------------------------*/
93 }
94
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