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A packaging of the IntelliJ Community Edition xml-psi-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 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.xml.index;

import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.ProjectFileIndex;
import com.intellij.openapi.roots.ProjectRootManager;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.NullableFunction;
import com.intellij.util.indexing.AdditionalIndexedRootsScope;
import com.intellij.util.indexing.FileBasedIndex;
import com.intellij.util.indexing.ID;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * @author Dmitry Avdeev
 */
public class IndexedRelevantResource implements Comparable> {

  public static  List> getResources(ID indexId,
                                                                                           final K key,
                                                                                           @Nullable final Module module,
                                                                                           @NotNull Project project,
                                                                                           @Nullable final GlobalSearchScope additionalScope) {

    if (project.isDefault()) return Collections.emptyList();
    final ArrayList> resources = new ArrayList>();
    final ProjectFileIndex fileIndex = ProjectRootManager.getInstance(project).getFileIndex();
    FileBasedIndex.getInstance().processValues(indexId, key, null, new FileBasedIndex.ValueProcessor() {
      @Override
      public boolean process(VirtualFile file, V value) {
        ResourceRelevance relevance = ResourceRelevance.getRelevance(file, module, fileIndex, additionalScope);
        resources.add(new IndexedRelevantResource(file, key, value, relevance));
        return true;
      }
    }, new AdditionalIndexedRootsScope(GlobalSearchScope.allScope(project)));
    return resources;
  }

  public static  List> getAllResources(ID indexId,
                                                                                              @Nullable final Module module,
                                                                                              @NotNull Project project,
                                                                                              @Nullable NullableFunction>, IndexedRelevantResource> chooser) {
    ArrayList> all = new ArrayList>();
    Collection allKeys = FileBasedIndex.getInstance().getAllKeys(indexId, project);
    for (K key : allKeys) {
      List> resources = getResources(indexId, key, module, project, null);
      if (!resources.isEmpty()) {
        if (chooser == null) {
          all.add(resources.get(0));
        }
        else {
          IndexedRelevantResource resource = chooser.fun(resources);
          if (resource != null) {
            all.add(resource);
          }
        }
      }
    }
    return all;
  }

  private final VirtualFile myFile;
  private final K myKey;
  private final V myValue;
  private final ResourceRelevance myRelevance;

  public IndexedRelevantResource(VirtualFile file, K key, V value, ResourceRelevance relevance) {
    myFile = file;
    myKey = key;
    myValue = value;
    myRelevance = relevance;
  }

  public VirtualFile getFile() {
    return myFile;
  }

  public V getValue() {
    return myValue;
  }

  public ResourceRelevance getRelevance() {
    return myRelevance;
  }

  @Override
  public int compareTo(IndexedRelevantResource o) {
    int i = myRelevance.compareTo(o.getRelevance());
    return i == 0 ? myValue.compareTo(o.getValue()) : i;
  }

  public K getKey() {
    return myKey;
  }

  @Override
  public String toString() {
    return "IndexedRelevantResource{" +
           "myRelevance=" +
           myRelevance +
           ", myKey=" +
           myKey +
           ", myValue=" +
           myValue +
           ", myFile=" +
           myFile +
           '}';
  }
}