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1
15 package org.apache.hivemind.lib.factory;
16
17 import java.lang.reflect.Constructor  ;
18 import java.util.HashMap ;
19 import java.util.Iterator ;
20 import java.util.List ;
21 import java.util.Map ;
22
23 import org.apache.hivemind.ApplicationRuntimeException;
24 import org.apache.hivemind.ErrorLog;
25 import org.apache.hivemind.HiveMind;
26 import org.apache.hivemind.impl.BaseLocatable;
27 import org.apache.hivemind.lib.BeanFactory;
28
29
34 public class BeanFactoryImpl extends BaseLocatable implements BeanFactory
35 {
36 private ErrorLog _errorLog;
37
38 private Class _vendType;
39
40 private Map _contributions = new HashMap ();
41
42 private Map _cache = new HashMap ();
43
44 private boolean _defaultCacheable;
45
46 public BeanFactoryImpl(ErrorLog errorLog, Class vendType, List contributions,
47 boolean defaultCacheable)
48 {
49 _errorLog = errorLog;
50 _vendType = vendType;
51 _defaultCacheable = defaultCacheable;
52
53 processContributions(contributions);
54 }
55
56 public boolean contains(String locator)
57 {
58 int commax = locator.indexOf(',');
59
60 String name = commax < 0 ? locator.trim() : locator.substring(0, commax);
61
62 return _contributions.containsKey(name);
63 }
64
65 private void processContributions(List list)
66 {
67 Iterator i = list.iterator();
68
69 while (i.hasNext())
70 {
71 BeanFactoryContribution c = (BeanFactoryContribution) i.next();
72
73 Class beanClass = c.getBeanClass();
74
75 if (beanClass.isInterface() || beanClass.isArray() || beanClass.isPrimitive())
76 {
77 _errorLog.error(FactoryMessages.invalidContributionClass(c), c.getLocation(), null);
78 continue;
79 }
80
81 if (!_vendType.isAssignableFrom(beanClass))
82 {
83 _errorLog.error(FactoryMessages.wrongContributionType(c, _vendType), c
84 .getLocation(), null);
85 continue;
86 }
87
88 _contributions.put(c.getName(), c);
89 }
90 }
91
92 public synchronized Object get(String locator)
93 {
94 Object result = _cache.get(locator);
95
96 if (result == null)
97 result = create(locator);
98
99 return result;
100 }
101
102
104 private Object create(String locator)
105 {
106 int commax = locator.indexOf(',');
107
108 String name = commax < 0 ? locator.trim() : locator.substring(0, commax);
109 String initializer = commax < 0 ? null : locator.substring(commax + 1).trim();
110
111 BeanFactoryContribution c = (BeanFactoryContribution) _contributions.get(name);
112
113 if (c == null)
114 throw new ApplicationRuntimeException(FactoryMessages.unknownContribution(name));
115
116 Object result = construct(c, initializer);
117
118 if (c.getStoreResultInCache(_defaultCacheable))
119 _cache.put(locator, result);
120
121 return result;
122 }
123
124 private Object construct(BeanFactoryContribution contribution, String initializer)
125 {
126 Class beanClass = contribution.getBeanClass();
127
128 try
129 {
130 if (HiveMind.isBlank(initializer))
131 return beanClass.newInstance();
132
133 Constructor c = beanClass.getConstructor(new Class []
134 { String .class });
135
136 return c.newInstance(new Object []
137 { initializer });
138 }
139 catch (Exception ex)
140 {
141 throw new ApplicationRuntimeException(FactoryMessages
142 .unableToInstantiate(beanClass, ex), contribution.getLocation(), ex);
143
144 }
145 }
146
147 } |
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