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1
16 package org.apache.cocoon.components;
17
18 import java.util.Map  ;
19
20 import org.apache.avalon.framework.component.Component;
21 import org.apache.avalon.framework.component.ComponentException;
22 import org.apache.avalon.framework.component.ComponentManager;
23 import org.apache.avalon.framework.component.ComponentSelector;
24 import org.apache.avalon.framework.context.Context;
25 import org.apache.avalon.framework.context.ContextException;
26 import org.apache.avalon.framework.context.DefaultContext;
27 import org.apache.avalon.framework.service.ServiceException;
28 import org.apache.avalon.framework.service.ServiceManager;
29 import org.apache.avalon.framework.service.ServiceSelector;
30 import org.apache.cocoon.environment.Environment;
31
32
41
42 public class ComponentContext
43 extends DefaultContext {
44
45 protected static final String OBJECT_MODEL_KEY_PREFIX = ContextHelper.CONTEXT_OBJECT_MODEL + '.';
46
47
53 public ComponentContext(final Map contextData, final Context parent) {
54 super( contextData, parent );
55 }
56
57
62 public ComponentContext(final Map contextData) {
63 super( contextData );
64 }
65
66
71 public ComponentContext(final Context parent) {
72 super( parent );
73 }
74
75
79 public ComponentContext() {
80 super();
81 }
82
83
90 public Object get( final Object key )
91 throws ContextException {
92 if ( ContextHelper.CONTEXT_OBJECT_MODEL.equals(key)) {
93 final Environment env = CocoonComponentManager.getCurrentEnvironment();
94 if ( env == null ) {
95 throw new ContextException("Unable to locate " + key + " (No environment available)");
96 }
97 return env.getObjectModel();
98 } else if ( ContextHelper.CONTEXT_SITEMAP_SERVICE_MANAGER.equals(key)) {
99 final ComponentManager manager = CocoonComponentManager.getSitemapComponentManager();
100 if ( manager == null ) {
101 throw new ContextException("Unable to locate " + key + " (No environment available)");
102 }
103 return new ComponentManagerWrapper(manager);
104 }
105 if ( key instanceof String ) {
106 String stringKey = (String )key;
107 if ( stringKey.startsWith(OBJECT_MODEL_KEY_PREFIX) ) {
108 final Environment env = CocoonComponentManager.getCurrentEnvironment();
109 if ( env == null ) {
110 throw new ContextException("Unable to locate " + key + " (No environment available)");
111 }
112 final Map objectModel = env.getObjectModel();
113 String objectKey = stringKey.substring(OBJECT_MODEL_KEY_PREFIX.length());
114
115 Object o = objectModel.get( objectKey );
116 if ( o == null ) {
117 final String message = "Unable to locate " + key;
118 throw new ContextException( message );
119 }
120 return o;
121 }
122 }
123 return super.get( key );
124 }
125
126 public static final class ComponentManagerWrapper implements ServiceManager {
127
128 protected final ComponentManager manager;
129
130 public ComponentManagerWrapper(ComponentManager m) {
131 this.manager = m;
132 }
133
134
137 public boolean hasService(String role) {
138 return this.manager.hasComponent(role);
139 }
140
141
144 public Object lookup(String role) throws ServiceException {
145 try {
146 Object o = this.manager.lookup(role);
147 if ( o instanceof ComponentSelector ) {
148 o = new ComponentSelectorWrapper((ComponentSelector)o);
149 }
150 return o;
151 } catch (ComponentException ce) {
152 throw new ServiceException("ComponentManagerWrapper", "Unable to lookup component: " + role, ce);
153 }
154 }
155
156
159 public void release(Object c) {
160 if ( c instanceof ComponentSelectorWrapper ) {
161 c = ((ComponentSelectorWrapper)c).getComponent();
162 }
163 this.manager.release((Component)c);
164 }
165 }
166
167 public static final class ComponentSelectorWrapper implements ServiceSelector {
168
169 protected final ComponentSelector selector;
170
171 public ComponentSelectorWrapper(ComponentSelector s) {
172 this.selector = s;
173 }
174
175
178 public boolean isSelectable(Object role) {
179 return this.selector.hasComponent(role);
180 }
181
182
185 public void release(Object role) {
186 this.selector.release((Component)role);
187 }
188
189
192 public Object select(Object role) throws ServiceException {
193 try {
194 Object o = this.selector.select(role);
195 if ( o instanceof ComponentSelector ) {
196 o = new ComponentSelectorWrapper((ComponentSelector)o);
197 }
198 return o;
199 } catch (ComponentException ce) {
200 throw new ServiceException("ComponentServiceWrapper", "Unable to lookup component: " + role, ce);
201 }
202 }
203
204 public ComponentSelector getComponent() {
205 return this.selector;
206 }
207
208 }
209 }
210 |
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