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11 package com.hp.hpl.jena.rdql.parser;
12
13 import java.io.PrintWriter  ;
14 import com.hp.hpl.jena.graph.Node;
15 import com.hp.hpl.jena.graph.query.Expression;
16 import com.hp.hpl.jena.graph.query.IndexValues;
17 import com.hp.hpl.jena.rdql.Query;
18 import com.hp.hpl.jena.rdql.QueryException;
19 import com.hp.hpl.jena.rdql.QueryPrintUtils;
20
21 public class Q_StringLangEqual extends ExprNode implements Expr, ExprBoolean
22 {
23 Expr left ;
24 Expr right ;
25
26 protected static String printName = "lang=" ;
27 protected static String opSymbol = "langeq" ;
28
29 Q_StringLangEqual(int id) { super(id); }
30
31 Q_StringLangEqual(RDQLParser p, int id) { super(p, id); }
32
33 protected boolean rawEval(NodeValue x, NodeValue y)
34 {
35 if ( x.isNode() && x.getNode().isLiteral() &&
36 y.isNode() && y.getNode().isLiteral() )
37 {
38 Node xNode = x.getNode() ;
39 Node yNode = y.getNode() ;
40 String nodeLang = xNode.getLiteral().language().toUpperCase();
41 String queryLang = yNode.getLiteral().getLexicalForm().toUpperCase();
42
49 if (queryLang.indexOf("-") >= 0)
50 {
51 return nodeLang.equals(queryLang);
52 }
53 else
54 {
55 int pos = nodeLang.indexOf("-");
56 if (pos > 0)
57 nodeLang = nodeLang.substring(0, pos);
58 return nodeLang.equals(queryLang);
59 }
60 }
61 return false;
62 }
63
64 public NodeValue eval(Query q, IndexValues env)
65 {
66 NodeValue x = left.eval(q, env) ;
67 NodeValue y = right.eval(q, env) ;
68
69 boolean b = rawEval(x, y) ;
70
71 NodeValueSettable result ;
72 if ( x instanceof NodeValueSettable )
73 result = (NodeValueSettable)x ;
74 else if ( y instanceof NodeValueSettable )
75 result = (NodeValueSettable)y ;
76 else
77 result = new WorkingVar() ;
78 result.setBoolean(b) ;
79 return result ;
80 }
81 public void jjtClose()
82 {
83 int n = jjtGetNumChildren() ;
84 if ( n != 2 )
85 throw new QueryException("Q_StringLangEqual: Wrong number of children: "+n) ;
86 left = (Expr)jjtGetChild(0) ;
87 right = (Expr)jjtGetChild(1) ;
88 }
89
90 public boolean isApply() { return true ; }
92 public String getFun() { return this.getClass().getName() ; } public int argCount() { return 2; }
94 public Expression getArg(int i)
95 {
96 if ( i == 0 && left instanceof Expression )
97 return (Expression)left ;
98 if ( i == 1 && right instanceof Expression )
99 return (Expression)right ;
100 return null;
101 }
102
104 public String asInfixString()
105 {
106 return QueryPrintUtils.asInfixString2(left, right, printName, opSymbol) ;
107 }
108 public String asPrefixString()
109 {
110 return QueryPrintUtils.asPrefixString(left, right, printName, opSymbol) ;
111 }
112 public void print(PrintWriter pw, int level)
113 {
114 QueryPrintUtils.print(pw, left, right, printName, opSymbol, level) ;
115 }
116 public String toString()
117 {
118 return asInfixString() ;
119 }
120 }
121
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