001 /*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.jetbrains.jet.asJava;
018
019 import com.google.common.base.Function;
020 import com.google.common.collect.Collections2;
021 import com.google.common.collect.Sets;
022 import com.intellij.openapi.extensions.Extensions;
023 import com.intellij.openapi.project.Project;
024 import com.intellij.psi.PsiClass;
025 import com.intellij.psi.PsiElementFinder;
026 import com.intellij.psi.PsiManager;
027 import com.intellij.psi.PsiPackage;
028 import com.intellij.psi.search.GlobalSearchScope;
029 import com.intellij.psi.util.CachedValue;
030 import com.intellij.psi.util.CachedValueProvider;
031 import com.intellij.psi.util.CachedValuesManager;
032 import com.intellij.psi.util.PsiModificationTracker;
033 import com.intellij.util.SmartList;
034 import com.intellij.util.containers.SLRUCache;
035 import org.jetbrains.annotations.NotNull;
036 import org.jetbrains.annotations.Nullable;
037 import org.jetbrains.jet.codegen.NamespaceCodegen;
038 import org.jetbrains.jet.lang.psi.JetClassOrObject;
039 import org.jetbrains.jet.lang.psi.JetEnumEntry;
040 import org.jetbrains.jet.lang.psi.JetFile;
041 import org.jetbrains.jet.lang.resolve.java.JavaPsiFacadeKotlinHacks;
042 import org.jetbrains.jet.lang.resolve.java.PackageClassUtils;
043 import org.jetbrains.jet.lang.resolve.name.FqName;
044 import org.jetbrains.jet.util.QualifiedNamesUtil;
045
046 import java.util.Collection;
047 import java.util.List;
048 import java.util.Set;
049
050 public class JavaElementFinder extends PsiElementFinder implements JavaPsiFacadeKotlinHacks.KotlinFinderMarker {
051
052 @NotNull
053 public static JavaElementFinder getInstance(@NotNull Project project) {
054 PsiElementFinder[] extensions = Extensions.getArea(project).getExtensionPoint(PsiElementFinder.EP_NAME).getExtensions();
055 for (PsiElementFinder extension : extensions) {
056 if (extension instanceof JavaElementFinder) {
057 return (JavaElementFinder) extension;
058 }
059 }
060 throw new IllegalStateException(JavaElementFinder.class.getSimpleName() + " is not found for project " + project);
061 }
062
063 private final Project project;
064 private final PsiManager psiManager;
065 private final LightClassGenerationSupport lightClassGenerationSupport;
066
067 private final CachedValue<SLRUCache<FindClassesRequest, PsiClass[]>> findClassesCache;
068
069 public JavaElementFinder(
070 @NotNull Project project,
071 @NotNull LightClassGenerationSupport lightClassGenerationSupport
072 ) {
073 this.project = project;
074 this.psiManager = PsiManager.getInstance(project);
075 this.lightClassGenerationSupport = lightClassGenerationSupport;
076 this.findClassesCache = CachedValuesManager.getManager(project).createCachedValue(
077 new CachedValueProvider<SLRUCache<FindClassesRequest, PsiClass[]>>() {
078 @Nullable
079 @Override
080 public Result<SLRUCache<FindClassesRequest, PsiClass[]>> compute() {
081 return new Result<SLRUCache<FindClassesRequest, PsiClass[]>>(
082 new SLRUCache<FindClassesRequest, PsiClass[]>(30, 10) {
083 @NotNull
084 @Override
085 public PsiClass[] createValue(FindClassesRequest key) {
086 return doFindClasses(key.fqName, key.scope);
087 }
088 },
089 PsiModificationTracker.OUT_OF_CODE_BLOCK_MODIFICATION_COUNT
090 );
091 }
092 },
093 false
094 );
095 }
096
097 @Override
098 public PsiClass findClass(@NotNull String qualifiedName, @NotNull GlobalSearchScope scope) {
099 PsiClass[] allClasses = findClasses(qualifiedName, scope);
100 return allClasses.length > 0 ? allClasses[0] : null;
101 }
102
103 @NotNull
104 @Override
105 public PsiClass[] findClasses(@NotNull String qualifiedNameString, @NotNull GlobalSearchScope scope) {
106 SLRUCache<FindClassesRequest, PsiClass[]> value = findClassesCache.getValue();
107 synchronized (value) {
108 return value.get(new FindClassesRequest(qualifiedNameString, scope));
109 }
110 }
111
112 private PsiClass[] doFindClasses(String qualifiedNameString, GlobalSearchScope scope) {
113 if (!QualifiedNamesUtil.isValidJavaFqName(qualifiedNameString)) {
114 return PsiClass.EMPTY_ARRAY;
115 }
116
117 List<PsiClass> answer = new SmartList<PsiClass>();
118
119 FqName qualifiedName = new FqName(qualifiedNameString);
120
121 findClassesAndObjects(qualifiedName, scope, answer);
122
123 if (PackageClassUtils.isPackageClassFqName(qualifiedName)) {
124 findPackageClass(qualifiedName.parent(), scope, answer);
125 }
126
127 return answer.toArray(new PsiClass[answer.size()]);
128 }
129
130 // Finds explicitly declared classes and objects, not package classes
131 private void findClassesAndObjects(FqName qualifiedName, GlobalSearchScope scope, List<PsiClass> answer) {
132 Collection<JetClassOrObject> classOrObjectDeclarations =
133 lightClassGenerationSupport.findClassOrObjectDeclarations(qualifiedName, scope);
134
135 for (JetClassOrObject declaration : classOrObjectDeclarations) {
136 if (!(declaration instanceof JetEnumEntry)) {
137 PsiClass lightClass = LightClassUtil.getPsiClass(declaration);
138 if (lightClass != null) {
139 answer.add(lightClass);
140 }
141 }
142 }
143 }
144
145 private void findPackageClass(FqName qualifiedName, GlobalSearchScope scope, List<PsiClass> answer) {
146 Collection<JetFile> filesForPackage = lightClassGenerationSupport.findFilesForPackage(qualifiedName, scope);
147
148 if (!filesForPackage.isEmpty() && NamespaceCodegen.shouldGenerateNSClass(filesForPackage)) {
149 KotlinLightClassForPackage lightClass = KotlinLightClassForPackage.create(psiManager, qualifiedName, scope, filesForPackage);
150 if (lightClass != null) {
151 answer.add(lightClass);
152
153 if (filesForPackage.size() > 1) {
154 for (JetFile file : filesForPackage) {
155 FakeLightClassForFileOfPackage fakeLightClass = new FakeLightClassForFileOfPackage(psiManager, lightClass, file);
156 answer.add(fakeLightClass);
157 }
158 }
159 }
160 }
161 }
162
163 @NotNull
164 @Override
165 public Set<String> getClassNames(@NotNull PsiPackage psiPackage, @NotNull GlobalSearchScope scope) {
166 FqName packageFQN = new FqName(psiPackage.getQualifiedName());
167
168 Collection<JetClassOrObject> declarations = lightClassGenerationSupport.findClassOrObjectDeclarationsInPackage(packageFQN, scope);
169
170 Set<String> answer = Sets.newHashSet();
171 answer.add(PackageClassUtils.getPackageClassName(packageFQN));
172
173 for (JetClassOrObject declaration : declarations) {
174 String name = declaration.getName();
175 if (name != null) {
176 answer.add(name);
177 }
178 }
179
180 return answer;
181 }
182
183 @Override
184 public PsiPackage findPackage(@NotNull String qualifiedNameString) {
185 if (!QualifiedNamesUtil.isValidJavaFqName(qualifiedNameString)) {
186 return null;
187 }
188
189 FqName fqName = new FqName(qualifiedNameString);
190
191 // allScope() because the contract says that the whole project
192 GlobalSearchScope allScope = GlobalSearchScope.allScope(project);
193 if (lightClassGenerationSupport.packageExists(fqName, allScope)) {
194 return new JetLightPackage(psiManager, fqName, allScope);
195 }
196
197 return null;
198 }
199
200 @NotNull
201 @Override
202 public PsiPackage[] getSubPackages(@NotNull PsiPackage psiPackage, @NotNull final GlobalSearchScope scope) {
203 FqName packageFQN = new FqName(psiPackage.getQualifiedName());
204
205 Collection<FqName> subpackages = lightClassGenerationSupport.getSubPackages(packageFQN, scope);
206
207 Collection<PsiPackage> answer = Collections2.transform(subpackages, new Function<FqName, PsiPackage>() {
208 @Override
209 public PsiPackage apply(@Nullable FqName input) {
210 return new JetLightPackage(psiManager, input, scope);
211 }
212 });
213
214 return answer.toArray(new PsiPackage[answer.size()]);
215 }
216
217 @NotNull
218 @Override
219 public PsiClass[] getClasses(@NotNull PsiPackage psiPackage, @NotNull GlobalSearchScope scope) {
220 List<PsiClass> answer = new SmartList<PsiClass>();
221 FqName packageFQN = new FqName(psiPackage.getQualifiedName());
222
223 findPackageClass(packageFQN, scope, answer);
224
225 Collection<JetClassOrObject> declarations = lightClassGenerationSupport.findClassOrObjectDeclarationsInPackage(packageFQN, scope);
226 for (JetClassOrObject declaration : declarations) {
227 PsiClass aClass = LightClassUtil.getPsiClass(declaration);
228 if (aClass != null) {
229 answer.add(aClass);
230 }
231 }
232
233 return answer.toArray(new PsiClass[answer.size()]);
234 }
235
236 private static class FindClassesRequest {
237 private final String fqName;
238 private final GlobalSearchScope scope;
239
240 private FindClassesRequest(@NotNull String fqName, @NotNull GlobalSearchScope scope) {
241 this.fqName = fqName;
242 this.scope = scope;
243 }
244
245 @Override
246 public boolean equals(Object o) {
247 if (this == o) return true;
248 if (o == null || getClass() != o.getClass()) return false;
249
250 FindClassesRequest request = (FindClassesRequest) o;
251
252 if (!fqName.equals(request.fqName)) return false;
253 if (!scope.equals(request.scope)) return false;
254
255 return true;
256 }
257
258 @Override
259 public int hashCode() {
260 int result = fqName.hashCode();
261 result = 31 * result + (scope.hashCode());
262 return result;
263 }
264 }
265 }
266