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1
64
65 package com.jcorporate.expresso.kernel.util;
66
67 import com.jcorporate.expresso.kernel.Containable;
68 import com.jcorporate.expresso.kernel.DataContext;
69 import com.jcorporate.expresso.kernel.ExpressoComponent;
70 import com.jcorporate.expresso.kernel.RootContainerInterface;
71 import com.jcorporate.expresso.kernel.digester.ComponentConfig;
72 import com.jcorporate.expresso.kernel.metadata.ComponentMetadata;
73
74 import java.util.ArrayList  ;
75 import java.util.ListIterator ;
76 import java.util.Map ;
77
78
79
92
93 public class LocatorUtils {
94 ExpressoComponent root = null;
95
96
102 public LocatorUtils(ExpressoComponent component) {
103 if (component == null) {
104 throw new IllegalArgumentException ("Must have a non-null argument for parameter 'component'");
105 }
106 boolean done = false;
107 Containable parent = null;
108 while (!done) {
109 parent = component.getParent();
110 if (parent == null) {
111 done = true;
112 root = component;
113 } else {
114 component = parent;
115 }
116 }
117 }
118
119
120
134 public ExpressoComponent locateComponent(String pathName) {
135 if (pathName == null || pathName.length() == 0) {
136 return root;
137 }
138
139 String stringLeft = pathName;
140 String singleComponent = null;
141 int splitPoint = 0;
142 ExpressoComponent currentComponent = root;
143 do {
144 splitPoint = stringLeft.indexOf(".");
145 if (splitPoint == 0) {
146 throw new IllegalArgumentException ("Malformed Path Request: " + pathName);
147 }
148 if (splitPoint == -1) {
149 singleComponent = stringLeft;
150 stringLeft = "";
151 } else {
152 singleComponent = stringLeft.substring(0, splitPoint);
153 stringLeft = stringLeft.substring(splitPoint + 1);
154 }
155
156 if (!(currentComponent instanceof Containable)) {
157 throw new IllegalArgumentException ("Can't navigate below component: "
158 + currentComponent.getMetaData().getName() +
159 "it is not a component container");
160 }
161
162 Containable currentContainer = (Containable) currentComponent;
163 Map children = currentContainer.getContainerImplementation().getChildComponents();
164 if (!children.containsKey(singleComponent)) {
165 throw new IllegalArgumentException ("Unable to locate subcomponent " +
166 singleComponent + " as a subcomponent of " + currentComponent.getMetaData().getName());
167 }
168
169 currentComponent = (ExpressoComponent) children.get(singleComponent);
170
171 } while (splitPoint > -1);
172
173 return currentComponent;
174 }
175
176
177
191 public ComponentConfig locateConfiguration(String pathName) {
192 if (pathName == null || pathName.length() == 0) {
193 return ((RootContainerInterface) root).getExpressoServicesConfig().getRootConfig();
194 }
195
196 String stringLeft = pathName;
197 String singleComponent = null;
198 int splitPoint = 0;
199 ComponentConfig currentComponent = ((RootContainerInterface) root)
200 .getExpressoServicesConfig().getRootConfig();
201 do {
202 splitPoint = stringLeft.indexOf(".");
203 if (splitPoint == 0) {
204 throw new IllegalArgumentException ("Malformed Path Request: " + pathName);
205 }
206 if (splitPoint == -1) {
207 singleComponent = stringLeft;
208 stringLeft = "";
209 } else {
210 singleComponent = stringLeft.substring(0, splitPoint);
211 stringLeft = stringLeft.substring(splitPoint + 1);
212 }
213
214 ComponentConfig testconfig = currentComponent.getChildComponent(singleComponent);
215 if (testconfig == null) {
216 throw new IllegalArgumentException ("Unable to locate subcomponent configuration " +
217 singleComponent + " as a subcomponent of " + currentComponent.getName());
218
219 }
220 currentComponent = testconfig;
221
222 } while (splitPoint > -1);
223
224 return currentComponent;
225 }
226
227
241 public ComponentMetadata locateMetadata(String pathName) {
242 ExpressoComponent component = this.locateComponent(pathName);
243 return component.getMetaData();
244 }
245
246
247
254 public String getPath(ExpressoComponent component) {
255 Containable c = component.getParent();
256 if (c == null) {
257 return "";
258 }
259
260 ExpressoComponent currentComponent = component;
261 ArrayList al = new ArrayList ();
262 while (c != null) {
264 al.add(currentComponent.getMetaData().getName());
265 currentComponent = c;
266 c = currentComponent.getParent();
267 }
268
269 FastStringBuffer path = FastStringBuffer.getInstance();
271 boolean needPeriod = false;
272 for (ListIterator i = al.listIterator(al.size()); i.hasPrevious();) {
273 String value = (String ) i.previous();
274 if (needPeriod) {
275 path.append(".");
276 } else {
277 needPeriod = true;
278 }
279
280 path.append(value);
281 }
282
283 String returnValue = path.toString();
284 path.release();
285 return returnValue;
286 }
287
288
296 public String getDataContextName(ExpressoComponent component) {
297 return getDataContext(component).getMetaData().getName();
298
299 }
300
301
302
309 public DataContext getDataContext(ExpressoComponent component) {
310 if (component == null) {
311 throw new IllegalArgumentException ("Must have a non-null argument for parameter 'component'");
312 }
313 boolean done = false;
314 Containable parent = null;
315 while (!done) {
316 parent = component.getParent();
317 if (parent instanceof DataContext) {
318 return (DataContext) parent;
319 }
320
321 if (parent == null) {
322 done = true;
323 }
324 component = parent;
325 }
326
327 return null;
328 }
329 }
330
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