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1
6 package tests.jfun.parsec.mssql;
7
8
13 public final class Relations {
14 public static Relation tablename(final TableName tn){
15 return new Relation(){
16 public void acceptVisitor(RelationVisitor v){
17 v.visitTableName(tn);
18 }
19 public String  toString(){
20 return ""+tn;
21 }
22 };
23 }
24 public static Relation join(final Relation r1, final int type,
25 final Relation r2, final BoolExpression cond){
26 return new Relation(){
27 public void acceptVisitor(RelationVisitor v){
28 v.visitJoin(r1, type, r2, cond);
29 }
30 public String toString(){
31 final StringBuffer buf = new StringBuffer ();
32 buf.append('(').append(r1).append(' ');
33 switch(type){
34 case Join.FULL : buf.append("full outer"); break;
35 case Join.INNER : buf.append("inner");break;
36 case Join.LEFT : buf.append("left outer");break;
37 case Join.RIGHT : buf.append("right outer");break;
38 default : buf.append("unknown");
39 }
40 buf.append(" join ").append(r2).append(" on ").append(cond)
41 .append(')');
42 return buf.toString();
43 }
44 };
45 }
46 public static Relation product(final Relation r1, final Relation r2){
47 return new Relation(){
48 public void acceptVisitor(RelationVisitor v){
49 v.visitProduct(r1, r2);
50 }
51 public String toString(){
52 return "(" + r1 + " cross join " + r2 + ")";
53 }
54 };
55 }
56 }
57 |
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