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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.ide.highlighter.DTDFileType;
import com.intellij.ide.highlighter.XmlFileType;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.OrderEntry;
import com.intellij.openapi.roots.ProjectFileIndex;
import com.intellij.openapi.roots.ProjectRootManager;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.VirtualFileFilter;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.indexing.DefaultFileTypeSpecificInputFilter;
import com.intellij.util.indexing.FileBasedIndex;
import com.intellij.util.indexing.FileBasedIndexExtension;
import com.intellij.util.io.EnumeratorStringDescriptor;
import com.intellij.util.io.KeyDescriptor;
import org.jetbrains.annotations.NotNull;

import java.util.List;

/**
 * @author Dmitry Avdeev
 */
public abstract class XmlIndex extends FileBasedIndexExtension {

  protected static final EnumeratorStringDescriptor KEY_DESCRIPTOR = new EnumeratorStringDescriptor();

  protected static GlobalSearchScope createFilter(final Project project) {
    final GlobalSearchScope projectScope = GlobalSearchScope.allScope(project);
    return new GlobalSearchScope(project) {
      @Override
      public int compare(@NotNull VirtualFile file1, @NotNull VirtualFile file2) {
        return projectScope.compare(file1, file2);
      }

      @Override
      public boolean isSearchInModuleContent(@NotNull Module aModule) {
        return true;
      }

      @Override
      public boolean contains(@NotNull VirtualFile file) {
        final VirtualFile parent = file.getParent();
        return parent != null && (parent.getName().equals("standardSchemas") || projectScope.contains(file));
      }

      @Override
      public boolean isSearchInLibraries() {
        return true;
      }
    };
  }


  protected static VirtualFileFilter createFilter(@NotNull final Module module) {

    final ProjectFileIndex fileIndex = ProjectRootManager.getInstance(module.getProject()).getFileIndex();
    return new VirtualFileFilter() {
      @Override
      public boolean accept(final VirtualFile file) {
        Module moduleForFile = fileIndex.getModuleForFile(file);
        if (moduleForFile != null) { // in module content
          return module.equals(moduleForFile);
        }
        if (fileIndex.isInLibraryClasses(file)) {
          List orderEntries = fileIndex.getOrderEntriesForFile(file);
          if (orderEntries.isEmpty()) {
            return false;
          }
          for (OrderEntry orderEntry : orderEntries) {
            Module ownerModule = orderEntry.getOwnerModule();
            if (ownerModule.equals(module)) {
              return true;
            }
          }
        }
        final VirtualFile parent = file.getParent();
        assert parent != null;
        return parent.getName().equals("standardSchemas");
      }
    };
  }

  @Override
  @NotNull
  public KeyDescriptor getKeyDescriptor() {
    return KEY_DESCRIPTOR;
  }

  @Override
  @NotNull
  public FileBasedIndex.InputFilter getInputFilter() {
    return new DefaultFileTypeSpecificInputFilter(XmlFileType.INSTANCE, DTDFileType.INSTANCE) {
      @Override
      public boolean acceptInput(@NotNull final VirtualFile file) {
        FileType fileType = file.getFileType();
        final String extension = file.getExtension();
        return XmlFileType.INSTANCE.equals(fileType) && "xsd".equals(extension) ||
               DTDFileType.INSTANCE.equals(fileType) && "dtd".equals(extension);
      }
    };
  }

  @Override
  public boolean dependsOnFileContent() {
    return true;
  }

  @Override
  public int getVersion() {
    return 0;
  }
}