Source Code Cross Referenced for ComponentClassResolverImpl.java in  » Library » Tapestry » org » apache » tapestry » internal » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.internal.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.internal.services;
016:
017:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newCaseInsensitiveMap;
018:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newList;
019:        import static org.apache.tapestry.ioc.internal.util.CollectionFactory.newMap;
020:
021:        import java.util.Collection;
022:        import java.util.List;
023:        import java.util.Map;
024:
025:        import org.apache.tapestry.internal.InternalConstants;
026:        import org.apache.tapestry.internal.events.InvalidationListener;
027:        import org.apache.tapestry.ioc.annotations.Inject;
028:        import org.apache.tapestry.ioc.annotations.Symbol;
029:        import org.apache.tapestry.ioc.internal.util.ConcurrentBarrier;
030:        import org.apache.tapestry.ioc.internal.util.Invokable;
031:        import org.apache.tapestry.services.ComponentClassResolver;
032:        import org.apache.tapestry.services.LibraryMapping;
033:
034:        public class ComponentClassResolverImpl implements 
035:                ComponentClassResolver, InvalidationListener {
036:            private static final String MIXINS_SUBPACKAGE = "mixins";
037:
038:            private static final String COMPONENTS_SUBPACKAGE = "components";
039:
040:            private static final String PAGES_SUBPACKAGE = "pages";
041:
042:            private final ComponentInstantiatorSource _componentInstantiatorSource;
043:
044:            private final ClassNameLocator _classNameLocator;
045:
046:            private final String _appRootPackage;
047:
048:            // Map from folder name to a list of root package names.
049:            // The key does not begin or end with a slash.
050:
051:            private final Map<String, List<String>> _mappings = newCaseInsensitiveMap();
052:
053:            // Flag indicating that the maps have been cleared following an invalidation
054:            // and need to be rebuilt. The flag and the four maps below are not synchronized
055:            // because they are only modified inside a synchronized block. That should be strong enough ...
056:            // and changes made will become "visible" at the end of the synchronized block. Because of the
057:            // structure of Tapestry, there should not be any reader threads while the write thread
058:            // is operating.
059:
060:            private boolean _needsRebuild = true;
061:
062:            private final Map<String, String> _pageToClassName = newCaseInsensitiveMap();
063:
064:            private final Map<String, String> _componentToClassName = newCaseInsensitiveMap();
065:
066:            private final Map<String, String> _mixinToClassName = newCaseInsensitiveMap();
067:
068:            /** This one is case sensitive, since class names do always have a particular case. */
069:            private final Map<String, String> _pageClassNameToLogicalName = newMap();
070:
071:            private final Map<String, String> _pageNameToCanonicalPageName = newCaseInsensitiveMap();
072:
073:            private final ConcurrentBarrier _barrier = new ConcurrentBarrier();
074:
075:            public ComponentClassResolverImpl(
076:                    ComponentInstantiatorSource componentInstantiatorSource,
077:                    ClassNameLocator classNameLocator,
078:
079:                    @Inject
080:                    @Symbol(InternalConstants.TAPESTRY_APP_PACKAGE_PARAM)
081:                    String appRootPackage,
082:
083:                    Collection<LibraryMapping> mappings) {
084:                _componentInstantiatorSource = componentInstantiatorSource;
085:                _classNameLocator = classNameLocator;
086:
087:                _appRootPackage = appRootPackage;
088:
089:                addPackagesToInstantiatorSource(_appRootPackage);
090:
091:                for (LibraryMapping mapping : mappings) {
092:                    String prefix = mapping.getPathPrefix();
093:
094:                    // TODO: Check that prefix is well formed (no leading or trailing slash)
095:
096:                    String rootPackage = mapping.getRootPackage();
097:
098:                    List<String> packages = _mappings.get(prefix);
099:
100:                    if (packages == null) {
101:                        packages = newList();
102:                        _mappings.put(prefix, packages);
103:                    }
104:
105:                    packages.add(rootPackage);
106:
107:                    // These packages, which will contain classes subject to class transformation,
108:                    // must be registered with the component instantiator (which is responsible
109:                    // for transformation).
110:
111:                    addPackagesToInstantiatorSource(rootPackage);
112:                }
113:
114:            }
115:
116:            private void addPackagesToInstantiatorSource(String rootPackage) {
117:                _componentInstantiatorSource.addPackage(rootPackage + ".pages");
118:                _componentInstantiatorSource.addPackage(rootPackage
119:                        + ".components");
120:                _componentInstantiatorSource
121:                        .addPackage(rootPackage + ".mixins");
122:                _componentInstantiatorSource.addPackage(rootPackage + ".base");
123:            }
124:
125:            /** When the class loader is invalidated, clear any cached page names or component types. */
126:            public synchronized void objectWasInvalidated() {
127:                _barrier.withWrite(new Runnable() {
128:                    public void run() {
129:                        _needsRebuild = true;
130:
131:                        _pageToClassName.clear();
132:                        _componentToClassName.clear();
133:                        _mixinToClassName.clear();
134:                        _pageClassNameToLogicalName.clear();
135:                        _pageNameToCanonicalPageName.clear();
136:                    }
137:                });
138:
139:            }
140:
141:            private void rebuild() {
142:                if (!_needsRebuild)
143:                    return;
144:
145:                _barrier.withWrite(new Runnable() {
146:                    public void run() {
147:                        rebuild("", _appRootPackage);
148:
149:                        for (String prefix : _mappings.keySet()) {
150:                            List<String> packages = _mappings.get(prefix);
151:
152:                            String folder = prefix + "/";
153:
154:                            for (String packageName : packages)
155:                                rebuild(folder, packageName);
156:                        }
157:
158:                        _needsRebuild = false;
159:                    }
160:                });
161:            }
162:
163:            private void rebuild(String pathPrefix, String rootPackage) {
164:                fillNameToClassNameMap(pathPrefix, rootPackage,
165:                        PAGES_SUBPACKAGE, _pageToClassName);
166:                fillNameToClassNameMap(pathPrefix, rootPackage,
167:                        COMPONENTS_SUBPACKAGE, _componentToClassName);
168:                fillNameToClassNameMap(pathPrefix, rootPackage,
169:                        MIXINS_SUBPACKAGE, _mixinToClassName);
170:            }
171:
172:            private void fillNameToClassNameMap(String pathPrefix,
173:                    String rootPackage, String subPackage,
174:                    Map<String, String> logicalNameToClassName) {
175:                String searchPackage = rootPackage + "." + subPackage;
176:                boolean isPage = subPackage.equals(PAGES_SUBPACKAGE);
177:
178:                Collection<String> classNames = _classNameLocator
179:                        .locateClassNames(searchPackage);
180:
181:                int startPos = searchPackage.length() + 1;
182:
183:                for (String name : classNames) {
184:                    String logicalName = toLogicalName(name, pathPrefix,
185:                            startPos);
186:
187:                    if (isPage) {
188:                        _pageClassNameToLogicalName.put(name, logicalName);
189:                        _pageNameToCanonicalPageName.put(logicalName,
190:                                logicalName);
191:                    }
192:
193:                    logicalNameToClassName.put(logicalName, name);
194:                }
195:            }
196:
197:            /**
198:             * Converts a fully qualified class name to a logical name
199:             * 
200:             * @param className
201:             *            fully qualified class name
202:             * @param pathPrefix
203:             *            prefix to be placed on the logical name (to identify the library from in which the
204:             *            class lives)
205:             * @param startPos
206:             *            start position within the class name to extract the logical name (i.e., after the
207:             *            final '.' in "rootpackage.pages.").
208:             * @return a short logical name in folder format ('.' replaced with '/')
209:             */
210:            private String toLogicalName(String className, String pathPrefix,
211:                    int startPos) {
212:                String[] terms = className.substring(startPos).split("\\.");
213:                StringBuilder builder = new StringBuilder(pathPrefix);
214:                String sep = "";
215:
216:                String logicalName = terms[terms.length - 1];
217:
218:                for (int i = 0; i < terms.length - 1; i++) {
219:
220:                    String term = terms[i];
221:
222:                    builder.append(sep);
223:                    builder.append(term);
224:
225:                    sep = "/";
226:
227:                    logicalName = stripTerm(term, logicalName);
228:                }
229:
230:                // The problem here is that you can eventually end up with the empty string.
231:
232:                assert logicalName.length() > 0;
233:
234:                builder.append(sep);
235:                builder.append(logicalName);
236:
237:                return builder.toString();
238:            }
239:
240:            private String stripTerm(String term, String logicalName) {
241:                if (isCaselessPrefix(term, logicalName)) {
242:                    logicalName = logicalName.substring(term.length());
243:                }
244:
245:                if (isCaselessSuffix(term, logicalName)) {
246:                    logicalName = logicalName.substring(0, logicalName.length()
247:                            - term.length());
248:                }
249:
250:                return logicalName;
251:            }
252:
253:            private boolean isCaselessPrefix(String prefix, String string) {
254:                return string
255:                        .regionMatches(true, 0, prefix, 0, prefix.length());
256:            }
257:
258:            private boolean isCaselessSuffix(String suffix, String string) {
259:                return string.regionMatches(true, string.length()
260:                        - suffix.length(), suffix, 0, suffix.length());
261:            }
262:
263:            public String resolvePageNameToClassName(final String pageName) {
264:                return _barrier.withRead(new Invokable<String>() {
265:                    public String invoke() {
266:                        String result = locate(pageName, _pageToClassName);
267:
268:                        if (result == null)
269:                            throw new IllegalArgumentException(ServicesMessages
270:                                    .couldNotResolvePageName(pageName,
271:                                            _pageToClassName.keySet()));
272:
273:                        return result;
274:                    }
275:                });
276:
277:            }
278:
279:            public boolean isPageName(final String pageName) {
280:                return _barrier.withRead(new Invokable<Boolean>() {
281:                    public Boolean invoke() {
282:                        return locate(pageName, _pageToClassName) != null;
283:                    }
284:                });
285:            }
286:
287:            public String resolveComponentTypeToClassName(
288:                    final String componentType) {
289:                return _barrier.withRead(new Invokable<String>() {
290:                    public String invoke() {
291:                        String result = locate(componentType,
292:                                _componentToClassName);
293:
294:                        if (result == null)
295:                            throw new IllegalArgumentException(ServicesMessages
296:                                    .couldNotResolveComponentType(
297:                                            componentType,
298:                                            _componentToClassName.keySet()));
299:
300:                        return result;
301:                    }
302:                });
303:            }
304:
305:            public String resolveMixinTypeToClassName(final String mixinType) {
306:                return _barrier.withRead(new Invokable<String>() {
307:                    public String invoke() {
308:                        String result = locate(mixinType, _mixinToClassName);
309:
310:                        if (result == null)
311:                            throw new IllegalArgumentException(ServicesMessages
312:                                    .couldNotResolveMixinType(mixinType,
313:                                            _mixinToClassName.keySet()));
314:
315:                        return result;
316:                    }
317:                });
318:            }
319:
320:            /**
321:             * Locates a class name within the provided map, given its logical name. If not found naturally,
322:             * a search inside the "core" library is included.
323:             * 
324:             * @param logicalName
325:             *            name to search for
326:             * @param logicalNameToClassName
327:             *            mapping from logical name to class name
328:             * @return the located class name or null
329:             */
330:            private String locate(String logicalName,
331:                    Map<String, String> logicalNameToClassName) {
332:                rebuild();
333:
334:                String result = logicalNameToClassName.get(logicalName);
335:
336:                // If not found, see if it exists under the core package. In this way,
337:                // anything in core is "inherited" (but overridable) by the application.
338:
339:                if (result == null)
340:                    result = logicalNameToClassName.get("core/" + logicalName);
341:
342:                return result;
343:            }
344:
345:            public String resolvePageClassNameToPageName(
346:                    final String pageClassName) {
347:                return _barrier.withRead(new Invokable<String>() {
348:                    public String invoke() {
349:                        rebuild();
350:
351:                        String result = _pageClassNameToLogicalName
352:                                .get(pageClassName);
353:
354:                        if (result == null)
355:                            throw new IllegalArgumentException(ServicesMessages
356:                                    .pageNameUnresolved(pageClassName));
357:
358:                        return result;
359:                    }
360:                });
361:            }
362:
363:            public String canonicalizePageName(final String pageName) {
364:                return _barrier.withRead(new Invokable<String>() {
365:                    public String invoke() {
366:                        String result = locate(pageName,
367:                                _pageNameToCanonicalPageName);
368:
369:                        if (result == null)
370:                            throw new IllegalArgumentException(ServicesMessages
371:                                    .couldNotCanonicalizePageName(pageName,
372:                                            _pageNameToCanonicalPageName
373:                                                    .keySet()));
374:
375:                        return result;
376:                    }
377:                });
378:            }
379:
380:        }
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