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A packaging of the IntelliJ Community Edition java-indexing-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.psi.impl.search;

import com.intellij.lang.spi.SPILanguage;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.application.QueryExecutorBase;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Computable;
import com.intellij.psi.*;
import com.intellij.psi.search.FilenameIndex;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.search.SearchScope;
import com.intellij.psi.search.searches.ReferencesSearch;
import com.intellij.psi.util.ClassUtil;
import com.intellij.util.Processor;
import org.jetbrains.annotations.NotNull;

public class SPIReferencesSearcher extends QueryExecutorBase {
  @Override
  public void processQuery(@NotNull final ReferencesSearch.SearchParameters p, @NotNull final Processor consumer) {
    final SearchScope scope = ApplicationManager.getApplication().runReadAction(new Computable() {
      @Override
      public SearchScope compute() {
        return p.getEffectiveSearchScope();
      }
    });
    if (!(scope instanceof GlobalSearchScope)) return;
    
    final PsiElement element = p.getElementToSearch();
    if (element instanceof PsiClass) {
      final PsiClass aClass = (PsiClass)element;
      final String jvmClassName = ApplicationManager.getApplication().runReadAction(new Computable() {
        @Override
        public String compute() {
          return ClassUtil.getJVMClassName(aClass);
        }
      });

      if (jvmClassName == null) return;
      final PsiFile[] files = ApplicationManager.getApplication().runReadAction(new Computable() {
        @Override
        public PsiFile[] compute() {
          return FilenameIndex.getFilesByName(aClass.getProject(), jvmClassName, (GlobalSearchScope)scope);
        }
      });
      for (PsiFile file : files) {
        if (file.getLanguage() == SPILanguage.INSTANCE) {
          final PsiReference reference = file.getReference();
          if (reference != null) {
            ApplicationManager.getApplication().runReadAction(new Runnable() {
              @Override
              public void run() {
                consumer.process(reference);
              }
            });
          }
        }
      }
    } else if (element instanceof PsiPackage) {
      final String qualifiedName = ((PsiPackage)element).getQualifiedName();
      final Project project = element.getProject();
      final String[] filenames = FilenameIndex.getAllFilenames(project);
      for (final String filename : filenames) {
        if (filename.startsWith(qualifiedName + ".")) {
          final PsiFile[] files = ApplicationManager.getApplication().runReadAction(new Computable() {
            @Override
            public PsiFile[] compute() {
              return FilenameIndex.getFilesByName(project, filename, (GlobalSearchScope)scope);
            }
          });
          for (PsiFile file : files) {
            if (file.getLanguage() == SPILanguage.INSTANCE) {
              final PsiReference[] references = file.getReferences();
              for (final PsiReference reference : references) {
                if (reference.getCanonicalText().equals(qualifiedName)) {
                  ApplicationManager.getApplication().runReadAction(new Runnable() {
                    public void run() {
                      consumer.process(reference);
                    }
                  });
                }
              }
            }
          }
        }
      }
    }
  }
}