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1 package com.quadcap.sql.types;
2
3
40
41 import java.io.Externalizable  ;
42 import java.io.IOException ;
43 import java.io.ObjectInput ;
44 import java.io.ObjectOutput ;
45
46
51 public class ValueUnknown extends Value implements Externalizable {
52 public static final ValueUnknown valueUnknown
53 = new ValueUnknown();
54
55 public ValueUnknown() {}
56
57 public Value unop(int op) throws ValueException {
58 switch (op) {
59 case Op.NULL:
60 return ValueBoolean.falseBoolean;
61 case Op.NOT:
62 return this;
63 default:
64 throw new ValueException("Unary op: " + Op.toString(op) +
65 " not implemented for this type");
66 }
67 }
68
69 public Value binop(int op, Value l) throws ValueException {
70 return l.binop(op, this);
71 }
72
73 public Value binop(int op, ValueBlob r) throws ValueException {
74 return this;
75 }
76
77 public Value binop(int op, ValueBoolean e)
78 throws ValueException
79 {
80 switch (op) {
81 case Op.AND:
82 if (e.isTrue()) return this;
83 else return new ValueBoolean(false);
84 case Op.OR:
85 if (e.isTrue()) return new ValueBoolean(true);
86 else return this;
87
88 default:
89 throw new ValueException("op: " + op + " not valid for this type");
90 }
91 }
92
93 public Value binop(int op, ValueByte r) throws ValueException {
94 return this;
95 }
96
97 public Value binop(int op, ValueClob r) throws ValueException {
98 return this;
99 }
100
101 public Value binop(int op, ValueDate r) throws ValueException {
102 return this;
103 }
104
105 public Value binop(int op, ValueDefault r) throws ValueException {
106 return this;
107 }
108
109 public Value binop(int op, ValueDouble r) throws ValueException {
110 return this;
111 }
112
113 public Value binop(int op, ValueFloat r) throws ValueException {
114 return this;
115 }
116
117 public Value binop(int op, ValueInteger r) throws ValueException {
118 return this;
119 }
120
121 public Value binop(int op, ValueInterval r) throws ValueException {
122 return this;
123 }
124
125 public Value binop(int op, ValueLong r) throws ValueException {
126 return this;
127 }
128
129 public Value binop(int op, ValueNull r) throws ValueException {
130 return this;
131 }
132
133 public Value binop(int op, ValueOctets r) throws ValueException {
134 return this;
135 }
136
137 public Value binop(int op, ValuePattern r) throws ValueException {
138 return this;
139 }
140
141 public Value binop(int op, ValueScaledInteger r) throws ValueException {
142 return this;
143 }
144
145 public Value binop(int op, ValueShort r) throws ValueException {
146 return this;
147 }
148
149 public Value binop(int op, ValueTime r) throws ValueException {
150 return this;
151 }
152
153 public Value binop(int op, ValueTimestamp r) throws ValueException {
154 return this;
155 }
156
157 public Value binop(int op, ValueType r) throws ValueException {
158 return this;
159 }
160
161 public Value binop(int op, ValueUnknown r) throws ValueException {
162 return this;
163 }
164
165 public boolean isTrue() { return false; }
166
167 public Object asJavaObject() {
168 return null;
169 }
170
171 public void fromJavaObject(Object obj) throws ValueException {
172 throw new ValueException("bad type: " + obj);
173 }
174
175 public Value convert(TypeDecimal type) {
176 return ValueNull.valueNull;
177 }
178
179 public Type getType() {
180 return TypeBinary.typeBinary;
181 }
182
183 public void readExternal(ObjectInput in) throws IOException {
184 }
185
186 public void writeExternal(ObjectOutput out)
187 throws IOException
188 {
189 }
190
191 public void serializeKey(KeyStream out) throws IOException {
192 throw new IOException ("can't use 'unknown' as key");
193 }
194
195 }
196 |
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