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Java > Open Source Codes > bsh > BSHClassDeclaration


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2  * *
3  * This file is part of the BeanShell Java Scripting distribution. *
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12  * The Original Code is BeanShell. The Initial Developer of the Original *
13  * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
14  * (C) 2000. All Rights Reserved. *
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28  * Patrick Niemeyer (pat@pat.net) *
29  * Author of Learning Java, O'Reilly & Associates *
30  * http://www.pat.net/~pat/ *
31  * *
32  *****************************************************************************/
33
34 package bsh;
35
36 /**
37 */
38 class BSHClassDeclaration extends SimpleNode
39 {
40     /**
41         The class instance initializer method name.
42         A BshMethod by this name is installed by the class delcaration into
43         the static class body namespace.
44         It is called once to initialize the static members of the class space
45         and each time an instances is created to initialize the instance
46         members.
47     */
48     static final String JavaDoc CLASSINITNAME = "_bshClassInit";
49
50     String JavaDoc name;
51     Modifiers modifiers;
52     int numInterfaces;
53     boolean extend;
54     boolean isInterface;
55
56     BSHClassDeclaration(int id) { super(id); }
57
58     /**
59     */
60     public Object JavaDoc eval( CallStack callstack, Interpreter interpreter )
61         throws EvalError
62     {
63         int child = 0;
64
65         // resolve superclass if any
66 Class JavaDoc superClass = null;
67         if ( extend )
68         {
69             BSHAmbiguousName superNode = (BSHAmbiguousName)jjtGetChild(child++);
70             superClass = superNode.toClass( callstack, interpreter );
71         }
72
73         // Get interfaces
74 Class JavaDoc [] interfaces = new Class JavaDoc[numInterfaces];
75         for( int i=0; i<numInterfaces; i++) {
76             BSHAmbiguousName node = (BSHAmbiguousName)jjtGetChild(child++);
77             interfaces[i] = node.toClass(callstack, interpreter);
78             if ( !interfaces[i].isInterface() )
79                 throw new EvalError(
80                     "Type: "+node.text+" is not an interface!",
81                     this, callstack );
82         }
83
84         BSHBlock block;
85         // Get the class body BSHBlock
86 if ( child < jjtGetNumChildren() )
87             block = (BSHBlock)jjtGetChild(child);
88         else
89             block = new BSHBlock( ParserTreeConstants.JJTBLOCK );
90
91         try {
92             return ClassGenerator.getClassGenerator().generateClass(
93                 name, modifiers, interfaces, superClass, block, isInterface,
94                 callstack, interpreter );
95         } catch ( UtilEvalError e ) {
96             throw e.toEvalError( this, callstack );
97         }
98
99     }
100
101     public String JavaDoc toString() {
102         return "ClassDeclaration: "+name;
103     }
104 }
105
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