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Java > Open Source Codes > bsh > BSHTypedVariableDeclaration


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13  * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
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32  *****************************************************************************/
33
34 package bsh;
35
36 class BSHTypedVariableDeclaration extends SimpleNode
37 {
38     public Modifiers modifiers;
39     
40     BSHTypedVariableDeclaration(int id) { super(id); }
41
42     private BSHType getTypeNode() {
43         return ((BSHType)jjtGetChild(0));
44     }
45
46     Class JavaDoc evalType( CallStack callstack, Interpreter interpreter )
47         throws EvalError
48     {
49         BSHType typeNode = getTypeNode();
50         return typeNode.getType( callstack, interpreter );
51     }
52
53     BSHVariableDeclarator [] getDeclarators()
54     {
55         int n = jjtGetNumChildren();
56         int start=1;
57         BSHVariableDeclarator [] bvda = new BSHVariableDeclarator[ n-start ];
58         for (int i = start; i < n; i++)
59         {
60             bvda[i-start] = (BSHVariableDeclarator)jjtGetChild(i);
61         }
62         return bvda;
63     }
64
65     /**
66         evaluate the type and one or more variable declarators, e.g.:
67             int a, b=5, c;
68     */
69     public Object JavaDoc eval( CallStack callstack, Interpreter interpreter)
70         throws EvalError
71     {
72         try {
73             NameSpace namespace = callstack.top();
74             BSHType typeNode = getTypeNode();
75             Class JavaDoc type = typeNode.getType( callstack, interpreter );
76
77             BSHVariableDeclarator [] bvda = getDeclarators();
78             for (int i = 0; i < bvda.length; i++)
79             {
80                 BSHVariableDeclarator dec = bvda[i];
81
82                 // Type node is passed down the chain for array initializers
83 // which need it under some circumstances
84 Object JavaDoc value = dec.eval( typeNode, callstack, interpreter);
85
86                 try {
87                     namespace.setTypedVariable(
88                         dec.name, type, value, modifiers );
89                 } catch ( UtilEvalError e ) {
90                     throw e.toEvalError( this, callstack );
91                 }
92             }
93         } catch ( EvalError e ) {
94             e.reThrow( "Typed variable declaration" );
95         }
96
97         return Primitive.VOID;
98     }
99
100     public String JavaDoc getTypeDescriptor(
101         CallStack callstack, Interpreter interpreter, String JavaDoc defaultPackage )
102     {
103         return getTypeNode().getTypeDescriptor(
104             callstack, interpreter, defaultPackage );
105     }
106 }
107
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