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1
13 package com.tonbeller.jpivot.olap.model;
14
15 import java.util.HashSet  ;
16 import java.util.Set ;
17
18
23 public class ExpressionPrinter extends VisitorSupportStrict {
24 StringBuffer sb = new StringBuffer ();
25
26 static final Set infix = new HashSet ();
27 static final Set prefix = new HashSet ();
28 static {
29 String [] s = new String [] { "*", "/", "+", "-", "%", "<", ">", "<=", ">=", "<>", "=", "and", "or", "xor" };
30 for (int i = 0; i < s.length; i++)
31 infix.add(s[i]);
32 prefix.add("not");
33 prefix.add("-");
34 };
35
36 public String print(Visitable e) {
37 if (e == null)
38 return "(null)";
39 sb = new StringBuffer ();
40 e.accept(this);
41 return sb.toString();
42 }
43
44 public String toString() {
45 return sb.toString();
46 }
47
48 void append(String s) {
49 sb.append(s);
50 }
51
52 public void visitBooleanExpr(BooleanExpr v) {
53 sb.append(v.getValue());
54 }
55 public void visitDimension(Dimension v) {
56 sb.append("[" + v.getLabel() + "]");
57 }
58 public void visitDoubleExpr(DoubleExpr v) {
59 sb.append(v.getValue());
60 }
61 public void visitFunCallExpr(FunCallExpr v) {
62 ExpressionPrinter ep = new ExpressionPrinter();
63 Expression[] args = v.getArgs();
64
65 String name = v.getName();
67 if (infix.contains(name) && args.length == 2) {
68 String left = ep.print(args[0]);
69 String right = ep.print(args[1]);
70 sb.append(left).append(name).append(right);
71 return;
72 }
73
74 for (int i = 0; i < args.length; i++) {
75 if (i > 0)
76 ep.append(", ");
77 args[i].accept(ep);
78 }
79 if ("()".equals(name))
80 sb.append("(").append(ep).append(")");
81 else if ("{}".equals(name))
82 sb.append("{").append(ep).append("}");
83 else if (prefix.contains(name))
84 sb.append(name).append(ep); else if (name.startsWith(".")) {
86 if (args.length > 1) {
87 ep = new ExpressionPrinter();
89 args[0].accept(ep);
90 sb.append(ep).append(name).append("(");
91 ep = new ExpressionPrinter();
92 for (int i = 1; i < args.length; i++) {
93 if (i > 1)
94 ep.append(", ");
95 args[i].accept(ep);
96 }
97 sb.append(ep).append(")");
98 }
99 else
100 sb.append(ep).append(name);
101 }
102 else
103 sb.append(name).append("(").append(ep).append(")");
104 }
105 public void visitHierarchy(Hierarchy v) {
106 sb.append("[" + v.getLabel() + "]");
107 }
108 public void visitIntegerExpr(IntegerExpr v) {
109 sb.append(v.getValue());
110 }
111 public void visitLevel(Level v) {
112 sb.append("[" + v.getLabel() + "]");
113 }
114 public void visitMember(Member v) {
115 sb.append("[" + v.getLabel() + "]");
116 }
117 public void visitParameterExpr(ParameterExpr v) {
118 sb.append("Parameter(\"RandomID\"");
121 switch (v.getType()) {
122 case ParameterExpr.MEMBER :
123 sb.append(", MEMBER");
124 break;
125 case ParameterExpr.NUMBER :
126 sb.append(", NUMBER");
127 break;
128 case ParameterExpr.STRING :
129 sb.append(", STRING");
130 break;
131 default :
132 throw new IllegalArgumentException ();
133 }
134 sb.append(", \"").append(v.getLabel()).append("\"");
135 sb.append(", ");
136 v.getValue().accept(this);
137 sb.append(")");
138 }
139 public void visitStringExpr(StringExpr v) {
140 sb.append("\"" + v.getValue() + "\"");
141 }
142
143 public void visitPropertyExpr(PropertyExpr v) {
144 sb.append(v.getName()).append("=");
145 v.getValueExpr().accept(this);
146 sb.append(";");
147
148 }
149
150 }
151 |
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