platform/lang-impl/src/com/intellij/openapi/module/ResourceFileUtil.java

/*
 * Copyright 2000-2009 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.openapi.module;

import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.impl.DirectoryIndex;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.FilteredQuery;
import org.jetbrains.annotations.Nullable;

public class ResourceFileUtil {
  private ResourceFileUtil() {
  }

  @Nullable
  public static VirtualFile findResourceFileInDependents(final Module searchFromModule, final String fileName) {
    return findResourceFileInScope(fileName, searchFromModule.getProject(), searchFromModule.getModuleWithDependenciesScope());
  }

  @Nullable
  public static VirtualFile findResourceFileInProject(final Project project, final String resourceName) {
    return findResourceFileInScope(resourceName, project, GlobalSearchScope.projectScope(project));
  }

  @Nullable
  public static VirtualFile findResourceFileInScope(final String resourceName,
                                                    final Project project,
                                                    final GlobalSearchScope scope) {
    int index = resourceName.lastIndexOf('/');
    String packageName = index >= 0 ? resourceName.substring(0, index).replace('/', '.') : "";
    final String fileName = index >= 0 ? resourceName.substring(index+1) : resourceName;

    final VirtualFile dir = new FilteredQuery<VirtualFile>(
      DirectoryIndex.getInstance(project).getDirectoriesByPackageName(packageName, false), new Condition<VirtualFile>() {
      @Override
      public boolean value(final VirtualFile file) {
        final VirtualFile child = file.findChild(fileName);
        return child != null && scope.contains(child);
      }
    }).findFirst();
    return dir != null ? dir.findChild(fileName) : null;
  }
}