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16 package org.apache.cocoon.woody.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.cocoon.components.LifecycleHelper;
33
34
39 public class SimpleServiceSelector extends AbstractLogEnabled implements ServiceSelector, Configurable, LogEnabled,
40 Serviceable, Disposable {
41 private final String hintShortHand;
42 private final Class componentClass;
43 private Map components = new HashMap ();
44 private ServiceManager serviceManager;
45
46 public SimpleServiceSelector(String hintShortHand, Class componentClass) {
47 this.hintShortHand = hintShortHand;
48 this.componentClass = componentClass;
49 }
50
51 public void service(ServiceManager serviceManager) throws ServiceException {
52 this.serviceManager = serviceManager;
53 }
54
55 public void configure(Configuration configuration) throws ConfigurationException {
56 Configuration[] componentConfs = configuration.getChildren(hintShortHand);
57 for (int i = 0; i < componentConfs.length; i++) {
58 String name = componentConfs[i].getAttribute("name");
59 String src = componentConfs[i].getAttribute("src");
60
61 Class clazz = null;
62 try {
63 clazz = Class.forName(src);
64 } catch (ClassNotFoundException e) {
65 throw new ConfigurationException("Class not found: " + src + ", declared at " + componentConfs[i].getLocation(), e);
66 }
67
68 if (!componentClass.isAssignableFrom(clazz))
69 throw new ConfigurationException("The class \"" + src + "\" is of an incorrect type, it should implement or exted " + componentClass.getName());
70
71 Object component = null;
72 try {
73 component = clazz.newInstance();
74 LifecycleHelper lifecycleHelper = new LifecycleHelper(getLogger(), null, serviceManager, null, componentConfs[i]);
75 lifecycleHelper.setupComponent(component);
76 } catch (Exception e) {
77 throw new ConfigurationException("Error creating " + hintShortHand + " declared at " + componentConfs[i].getLocation(), e);
78 }
79
80 components.put(name, component);
81 }
82 }
83
84 public Object select(Object hint) throws ServiceException {
85 if (!isSelectable(hint))
86 throw new ServiceException((String )hint, "Non-existing component for this hint");
87 String stringHint = (String )hint;
88 return components.get(stringHint);
89 }
90
91 public boolean isSelectable(Object hint) {
92 String stringHint = (String )hint;
93 return components.containsKey(stringHint);
94 }
95
96 public void release(Object o) {
97 }
98
99 public void dispose() {
100 Iterator serviceIt = components.values().iterator();
101 while (serviceIt.hasNext()) {
102 Object service = serviceIt.next();
103 if (service instanceof Disposable) {
104 try {
105 ((Disposable)service).dispose();
106 } catch (Exception e) {
107 getLogger().error("Error disposing service " + service, e);
108 }
109 }
110 }
111 }
112 }
113 |
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