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6
7
8 package com.hp.hpl.jena.rdql.parser;
9
10
11 import java.io.PrintWriter  ;
12 import com.hp.hpl.jena.graph.query.IndexValues;
13 import com.hp.hpl.jena.graph.query.Expression ;
14 import com.hp.hpl.jena.rdql.*;
15
16 public class Q_UnaryPlus extends ExprNode implements ExprNumeric {
17 Expr expr ;
18
19 private String printName = "unaryplus" ;
20 private String opSymbol = "+" ;
21
22 Q_UnaryPlus(int id) { super(id); }
23 Q_UnaryPlus(RDQLParser p, int id) { super(p, id); }
24
25 public NodeValue eval(Query q, IndexValues env)
26 {
27 NodeValue r = expr.eval(q, env) ;
28 if ( ! r.isNumber() )
29 throw new EvalTypeException("Q_UnaryPlus: Wanted a number: got "+expr) ;
30
31 return r ;
32 }
33
34 public void jjtClose()
35 {
36 int n = jjtGetNumChildren() ;
37 if ( n != 1 )
38 throw new QueryException("Q_UnaryPlus: Wrong number of children: "+n) ;
39 expr = (Expr)jjtGetChild(0) ;
40 }
41
42
45 public boolean isApply() { return true ; }
46 public String getFun() { return super.constructURI(this.getClass().getName()) ; }
47 public int argCount() { return 1; }
48 public Expression getArg(int i)
49 {
50 if ( i == 0 && expr instanceof Expression )
51 return (Expression)expr ;
52 return null;
53 }
54
55 public String asInfixString() { return QueryPrintUtils.asInfixString1(expr, printName, opSymbol) ; }
56
57 public String asPrefixString() { return QueryPrintUtils.asPrefixString(expr, null, printName, opSymbol) ; }
58
59 public void print(PrintWriter pw, int level) { QueryPrintUtils.print(pw, expr, null, printName, opSymbol, level) ; }
60
61 public String toString() { return asInfixString() ; }
62 }
63
64
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