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16 package org.apache.commons.jxpath.ri;
17
18 import org.apache.commons.jxpath.Pointer;
19 import org.apache.commons.jxpath.ri.model.NodePointer;
20 import org.apache.commons.jxpath.ri.model.VariablePointer;
21
22
28 public class InfoSetUtil {
29
30 private static final Double  ZERO = new Double (0);
31 private static final Double ONE = new Double (1);
32 private static final Double NOT_A_NUMBER = new Double (Double.NaN);
33
34
35
38 public static String stringValue(Object object) {
39 if (object instanceof String ) {
40 return (String ) object;
41 }
42 else if (object instanceof Number ) {
43 double d = ((Number ) object).doubleValue();
44 long l = ((Number ) object).longValue();
45 if (d == l) {
46 return String.valueOf(l);
47 }
48 return String.valueOf(d);
49 }
50 else if (object instanceof Boolean ) {
51 return ((Boolean ) object).booleanValue() ? "true" : "false";
52 }
53 else if (object == null) {
54 return "";
55 }
56 else if (object instanceof NodePointer) {
57 return stringValue(((NodePointer) object).getValue());
58 }
59 else if (object instanceof EvalContext) {
60 EvalContext ctx = (EvalContext) object;
61 Pointer ptr = ctx.getSingleNodePointer();
62 if (ptr != null) {
63 return stringValue(ptr);
64 }
65 return "";
66 }
67 return String.valueOf(object);
68 }
69
70
73 public static Number number(Object object) {
74 if (object instanceof Number ) {
75 return (Number ) object;
76 }
77 else if (object instanceof Boolean ) {
78 return ((Boolean ) object).booleanValue() ? ONE : ZERO;
79 }
80 else if (object instanceof String ) {
81 Double value;
82 try {
83 value = new Double ((String ) object);
84 }
85 catch (NumberFormatException ex) {
86 value = NOT_A_NUMBER;
87 }
88 return value;
89 }
90 else if (object instanceof EvalContext) {
91 EvalContext ctx = (EvalContext) object;
92 Pointer ptr = ctx.getSingleNodePointer();
93 if (ptr != null) {
94 return number(ptr);
95 }
96 return NOT_A_NUMBER;
97 }
98 else if (object instanceof NodePointer) {
99 return number(((NodePointer) object).getValue());
100 }
101 return number(stringValue(object));
102 }
103
104
107 public static double doubleValue(Object object) {
108 if (object instanceof Number ) {
109 return ((Number ) object).doubleValue();
110 }
111 else if (object instanceof Boolean ) {
112 return ((Boolean ) object).booleanValue() ? 0.0 : 1.0;
113 }
114 else if (object instanceof String ) {
115 if (object.equals("")) {
116 return 0.0;
117 }
118
119 double value;
120 try {
121 value = Double.parseDouble((String ) object);
122 }
123 catch (NumberFormatException ex) {
124 value = Double.NaN;
125 }
126 return value;
127 }
128 else if (object instanceof NodePointer) {
129 return doubleValue(((NodePointer) object).getValue());
130 }
131 else if (object instanceof EvalContext) {
132 EvalContext ctx = (EvalContext) object;
133 Pointer ptr = ctx.getSingleNodePointer();
134 if (ptr != null) {
135 return doubleValue(ptr);
136 }
137 return Double.NaN;
138 }
139 return doubleValue(stringValue(object));
140 }
141
142
145 public static boolean booleanValue(Object object) {
146 if (object instanceof Number ) {
147 double value = ((Number ) object).doubleValue();
148 return value != 0 && value != -0 && !Double.isNaN(value);
149 }
150 else if (object instanceof Boolean ) {
151 return ((Boolean ) object).booleanValue();
152 }
153 else if (object instanceof EvalContext) {
154 EvalContext ctx = (EvalContext) object;
155 Pointer ptr = ctx.getSingleNodePointer();
156 if (ptr == null) {
157 return false;
158 }
159 return booleanValue(ptr);
160 }
161 else if (object instanceof String ) {
162 return ((String ) object).length() != 0;
163 }
164 else if (object instanceof NodePointer) {
165 NodePointer pointer = (NodePointer) object;
166 if (pointer instanceof VariablePointer) {
167 return booleanValue(pointer.getNode());
168 }
169 pointer = pointer.getValuePointer();
170 return pointer.isActual();
171 }
172 else if (object == null) {
173 return false;
174 }
175 return true;
176 }
177 } |
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