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1
16 package org.apache.cocoon.forms.util;
17
18 import java.util.HashMap  ;
19 import java.util.Iterator ;
20 import java.util.Map ;
21
22 import org.apache.avalon.framework.activity.Disposable;
23 import org.apache.avalon.framework.configuration.Configurable;
24 import org.apache.avalon.framework.configuration.Configuration;
25 import org.apache.avalon.framework.configuration.ConfigurationException;
26 import org.apache.avalon.framework.logger.AbstractLogEnabled;
27 import org.apache.avalon.framework.logger.LogEnabled;
28 import org.apache.avalon.framework.service.ServiceException;
29 import org.apache.avalon.framework.service.ServiceManager;
30 import org.apache.avalon.framework.service.ServiceSelector;
31 import org.apache.avalon.framework.service.Serviceable;
32 import org.apache.avalon.framework.context.Contextualizable;
33 import org.apache.avalon.framework.context.Context;
34 import org.apache.avalon.framework.context.ContextException;
35 import org.apache.cocoon.components.LifecycleHelper;
36
37
42 public class SimpleServiceSelector extends AbstractLogEnabled implements ServiceSelector, Configurable, LogEnabled,
43 Serviceable, Disposable, Contextualizable {
44 private final String hintShortHand;
45 private final Class componentClass;
46 private Map components = new HashMap ();
47 private ServiceManager serviceManager;
48 private Context context;
49
50 public SimpleServiceSelector(String hintShortHand, Class componentClass) {
51 this.hintShortHand = hintShortHand;
52 this.componentClass = componentClass;
53 }
54
55 public void service(ServiceManager serviceManager) throws ServiceException {
56 this.serviceManager = serviceManager;
57 }
58
59 public void contextualize(Context context) throws ContextException {
60 this.context = context;
61 }
62
63 public void configure(Configuration configuration) throws ConfigurationException {
64 Configuration[] componentConfs = configuration.getChildren(hintShortHand);
65 for (int i = 0; i < componentConfs.length; i++) {
66 String name = componentConfs[i].getAttribute("name");
67 String src = componentConfs[i].getAttribute("src");
68
69 Class clazz = null;
70 try {
71 clazz = Class.forName(src);
72 } catch (ClassNotFoundException e) {
73 throw new ConfigurationException("Class not found: " + src + ", declared at " + componentConfs[i].getLocation(), e);
74 }
75
76 if (!componentClass.isAssignableFrom(clazz))
77 throw new ConfigurationException("The class \"" + src + "\" is of an incorrect type, it should implement or extend " + componentClass.getName());
78
79 Object component = null;
80 try {
81 component = clazz.newInstance();
82 LifecycleHelper.setupComponent(
83 component,
84 getLogger(),
85 context,
86 serviceManager,
87 componentConfs[i]);
88 } catch (Exception e) {
89 throw new ConfigurationException("Error creating " + hintShortHand + " declared at " + componentConfs[i].getLocation(), e);
90 }
91
92 components.put(name, component);
93 }
94 }
95
96 public Object select(Object hint) throws ServiceException {
97 if (!isSelectable(hint))
98 throw new ServiceException((String )hint, "Non-existing component for this hint");
99 String stringHint = (String )hint;
100 return components.get(stringHint);
101 }
102
103 public boolean isSelectable(Object hint) {
104 String stringHint = (String )hint;
105 return components.containsKey(stringHint);
106 }
107
108 public void release(Object o) {
109 }
110
111 public void dispose() {
112 Iterator serviceIt = components.values().iterator();
113 while (serviceIt.hasNext()) {
114 Object service = serviceIt.next();
115 if (service instanceof Disposable) {
116 try {
117 ((Disposable)service).dispose();
118 } catch (Exception e) {
119 getLogger().error("Error disposing service " + service, e);
120 }
121 }
122 }
123 }
124 }
125 |
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