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1 package com.icl.saxon.expr;
2 import com.icl.saxon.*;
3 import com.icl.saxon.functions.*;
4
5
6
10
11 public class ObjectValue extends Value {
12 private Object  value;
13
14
18
19 public ObjectValue(Object object) {
20 this.value = object;
21 }
22
23
27
28 public String asString() {
29 return (value==null ? "" : value.toString());
30 }
31
32
36
37 public double asNumber() {
38 return (value==null ? Double.NaN : Value.stringToNumber(value.toString()));
39 }
40
41
45
46 public boolean asBoolean() {
47 return (value==null ? false : value.toString().length() > 0);
48 }
49
50
54
55 public int getDataType() {
56 return Value.OBJECT;
57 }
58
59
62
63 public Object getObject() {
64 return value;
65 }
66
67
70
71 public boolean equals(ObjectValue other) {
72 return this.value.equals(other.value);
73 }
74
75
79
80 public int conversionPreference(Class required) {
81 if (required==boolean.class) return Integer.MAX_VALUE; if (required==Boolean .class) return Integer.MAX_VALUE; if (required==byte.class) return 4;
84 if (required==Byte .class) return 5;
85 if (required==char.class) return 2;
86 if (required==Character .class) return 3;
87 if (required==double.class) return 4;
88 if (required==Double .class) return 5;
89 if (required==float.class) return 4;
90 if (required==Float .class) return 5;
91 if (required==int.class) return 4;
92 if (required==Integer .class) return 5;
93 if (required==long.class) return 4;
94 if (required==Long .class) return 5;
95 if (required==short.class) return 4;
96 if (required==Short .class) return 5;
97 if (required==String .class) return 1;
98 if (required==Object .class) return 8;
99 if (required==value.getClass()) return -1;
100 if (required.isAssignableFrom(value.getClass())) return 0;
103 return Integer.MAX_VALUE;
104 }
105
106
109
110 public Object convertToJava(Class target) throws XPathException {
111
112 if (value==null) return null;
113
114 if (target.isAssignableFrom(value.getClass())) {
115 return value;
116 } else if (target==Value.class || target==ObjectValue.class) {
117 return this;
118 } else if (target==boolean.class) {
119 return new Boolean (asBoolean()); } else if (target==Boolean .class) {
121 return new Boolean (asBoolean()); } else if (target==String .class) {
123 return asString();
124 } else if (target==double.class) {
125 return new Double (asNumber());
126 } else if (target==Double .class) {
127 return new Double (asNumber());
128 } else if (target==float.class) {
129 return new Float (asNumber());
130 } else if (target==Float .class) {
131 return new Float (asNumber());
132 } else if (target==long.class) {
133 return new Long ((long)asNumber());
134 } else if (target==Long .class) {
135 return new Long ((long)asNumber());
136 } else if (target==int.class) {
137 return new Integer ((int)asNumber());
138 } else if (target==Integer .class) {
139 return new Integer ((int)asNumber());
140 } else if (target==short.class) {
141 return new Short ((short)asNumber());
142 } else if (target==Short .class) {
143 return new Short ((short)asNumber());
144 } else if (target==byte.class) {
145 return new Byte ((byte)asNumber());
146 } else if (target==Byte .class) {
147 return new Byte ((byte)asNumber());
148 } else if (target==char.class || target==Character .class) {
149 String s = asString();
150 if (s.length()==1) {
151 return new Character (s.charAt(0));
152 } else {
153 throw new XPathException("Cannot convert string to Java char unless length is 1");
154 }
155 } else {
156 throw new XPathException("Conversion of external object to " + target.getName() +
157 " is not supported");
158 }
159 }
160
161
164
165 public void display(int level) {
166 System.err.println(indent(level) + "** external object **" );
167 }
168
169 }
170
171
190 |
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