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1
22
23
24 package com.mchange.v2.naming;
25
26 import java.net.*;
27 import javax.naming.*;
28 import com.mchange.v2.log.MLevel;
29 import com.mchange.v2.log.MLog;
30 import com.mchange.v2.log.MLogger;
31 import javax.naming.spi.ObjectFactory  ;
32 import java.util.Hashtable ;
33
34 public final class ReferenceableUtils
35 {
36 final static MLogger logger = MLog.getLogger( ReferenceableUtils.class );
37
38
39 final static String REFADDR_VERSION = "version";
40 final static String REFADDR_CLASSNAME = "classname";
41 final static String REFADDR_FACTORY = "factory";
42 final static String REFADDR_FACTORY_CLASS_LOCATION = "factoryClassLocation";
43 final static String REFADDR_SIZE = "size";
44
45 final static int CURRENT_REF_VERSION = 1;
46
47
51 public static String literalNullToNull( String s )
52 {
53 if (s == null || "null".equals( s ))
54 return null;
55 else
56 return s;
57 }
58
59 public static Object referenceToObject( Reference ref, Name name, Context nameCtx, Hashtable env)
60 throws NamingException
61 {
62 try
63 {
64 String fClassName = ref.getFactoryClassName();
65 String fClassLocation = ref.getFactoryClassLocation();
66
67 ClassLoader cl;
68 if ( fClassLocation == null )
69 cl = ClassLoader.getSystemClassLoader();
70 else
71 {
72 URL u = new URL( fClassLocation );
73 cl = new URLClassLoader( new URL[] { u }, ClassLoader.getSystemClassLoader() );
74 }
75
76 Class fClass = Class.forName( fClassName, true, cl );
77 ObjectFactory of = (ObjectFactory ) fClass.newInstance();
78 return of.getObjectInstance( ref, name, nameCtx, env );
79 }
80 catch ( Exception e )
81 {
82 if (Debug.DEBUG)
83 {
84 if ( logger.isLoggable( MLevel.FINE ) )
86 logger.log( MLevel.FINE, "Could not resolve Reference to Object!", e);
87 }
88 NamingException ne = new NamingException("Could not resolve Reference to Object!");
89 ne.setRootCause( e );
90 throw ne;
91 }
92 }
93
94
99 public static void appendToReference(Reference appendTo, Reference orig)
100 throws NamingException
101 {
102 int len = orig.size();
103 appendTo.add( new StringRefAddr( REFADDR_VERSION, String.valueOf( CURRENT_REF_VERSION ) ) );
104 appendTo.add( new StringRefAddr( REFADDR_CLASSNAME, orig.getClassName() ) );
105 appendTo.add( new StringRefAddr( REFADDR_FACTORY, orig.getFactoryClassName() ) );
106 appendTo.add( new StringRefAddr( REFADDR_FACTORY_CLASS_LOCATION,
107 orig.getFactoryClassLocation() ) );
108 appendTo.add( new StringRefAddr( REFADDR_SIZE, String.valueOf(len) ) );
109 for (int i = 0; i < len; ++i)
110 appendTo.add( orig.get(i) );
111 }
112
113
118 public static ExtractRec extractNestedReference(Reference extractFrom, int index)
119 throws NamingException
120 {
121 try
122 {
123 int version = Integer.parseInt((String ) extractFrom.get(index++).getContent());
124 if (version == 1)
125 {
126 String className = (String ) extractFrom.get(index++).getContent();
127 String factoryClassName = (String ) extractFrom.get(index++).getContent();
128 String factoryClassLocation = (String ) extractFrom.get(index++).getContent();
129
130 Reference outRef = new Reference( className,
131 factoryClassName,
132 factoryClassLocation );
133 int size = Integer.parseInt((String ) extractFrom.get(index++).getContent());
134 for (int i = 0; i < size; ++i)
135 outRef.add( extractFrom.get( index++ ) );
136 return new ExtractRec( outRef, index );
137 }
138 else
139 throw new NamingException("Bad version of nested reference!!!");
140 }
141 catch (NumberFormatException e)
142 {
143 if (Debug.DEBUG)
144 {
145 if ( logger.isLoggable( MLevel.FINE ) )
147 logger.log( MLevel.FINE, "Version or size nested reference was not a number!!!", e);
148 }
149 throw new NamingException("Version or size nested reference was not a number!!!");
150 }
151 }
152
153
158 public static class ExtractRec
159 {
160 public Reference ref;
161
162
166 public int index;
167
168 private ExtractRec(Reference ref, int index)
169 {
170 this.ref = ref;
171 this.index = index;
172 }
173 }
174
175 private ReferenceableUtils()
176 {}
177 }
178 |
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