Source Code Cross Referenced for SFieldBoolean.java in  » Database-ORM » SimpleORM » simpleorm » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » SimpleORM » simpleorm.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package simpleorm.core;
02:
03:        import simpleorm.properties.*;
04:        import java.sql.ResultSet;
05:
06:        /** 
07:         * Booleans are represented as Boolean.TRUE/FALSE internally.
08:         * However,  SQL89 does not have a concept of boolean, only strings
09:         * and numbers.  So these are normally mapped to strings like "Y", "N".
10:         * Which representation is determined in subclasses.
11:         * (The JDBC java docs are useless as always "getBoolean gets booleans...").<p>
12:        
13:         (The issue is with JDBC, not SimpleORM.  And of course SFieldObject
14:         can always be used if really needed.)  */
15:
16:        public abstract class SFieldBoolean extends SFieldScalar {
17:            public SFieldBoolean(SRecordMeta meta, String columnName,
18:                    SPropertyValue[] pvals) {
19:                super (meta, columnName, pvals);
20:            }
21:
22:            /**
23:             * Converts from the users external representation to 
24:             * the internal representation stored in SRecordInstance.
25:             * This is deliberately quite permissive, and should work even
26:             * if the external world is a bit inconsistent.
27:             */
28:            Object convertToField(Object raw) // In SFieldBoolean
29:            {
30:                return convertExternalToBoolean(raw);
31:            }
32:
33:            /**
34:             * Shared routine for converting database representations to booleans so all boolean
35:             * implementations can be consistent and so boolean classes can be attached to existing
36:             * database columns 
37:             */
38:            protected Object convertDatabaseToBoolean(ResultSet rs, int sqlIndex)
39:                    throws Exception {
40:                // Only a default.
41:                return convertExternalToBoolean(rs.getObject(sqlIndex));
42:            }
43:
44:            /**
45:             * Shared routine for converting Strings to booleans so all boolean
46:             * implementations can be consistent.
47:             */
48:            protected Boolean convertExternalToBoolean(Object raw) {
49:                if (raw == null)
50:                    return null;
51:                else if (raw instanceof  Boolean)
52:                    return (Boolean) raw;
53:                else if (raw instanceof  String) {
54:                    String s = (String) raw;
55:                    if ("t".equalsIgnoreCase(s) || "true".equalsIgnoreCase(s)
56:                            || "y".equalsIgnoreCase(s)
57:                            || "yes".equalsIgnoreCase(s))
58:                        return Boolean.TRUE;
59:                    else if ("f".equalsIgnoreCase(s)
60:                            || "false".equalsIgnoreCase(s)
61:                            || "n".equalsIgnoreCase(s)
62:                            || "no".equalsIgnoreCase(s))
63:                        return Boolean.FALSE;
64:                    else
65:                        throw new SException.Error(
66:                                "String \""
67:                                        + s
68:                                        + "\" could not be converted to a java.lang.Boolean");
69:                } else if (raw instanceof  Number) {
70:                    int i = ((Number) raw).intValue();
71:                    return i != 0 ? Boolean.TRUE : Boolean.FALSE;
72:                } else
73:                    throw new SException.Error("Cannot Convert '" + raw
74:                            + "' to Boolean.");
75:            }
76:        }
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