/*
 * 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.lang.properties.editor;

import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.fileEditor.FileEditor;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class ResourceBundleEditorUtil {
  /**
   * Tries to derive {@link com.intellij.lang.properties.editor.ResourceBundleEditor resource bundle editor} identified by the given context.
   *
   * @param dataContext     target data context
   * @return resource bundle editor identified by the given context; <code>null</code> otherwise
   */
  @Nullable
  public static ResourceBundleEditor getEditor(@NotNull DataContext dataContext) {
    Project project = CommonDataKeys.PROJECT.getData(dataContext);
    if (project == null) {
      return null;
    }

    VirtualFile virtualFile = CommonDataKeys.VIRTUAL_FILE.getData(dataContext);
    if (virtualFile == null) {
      return null;
    }
    FileEditor[] editors = FileEditorManager.getInstance(project).getEditors(virtualFile);
    if (editors.length != 1 || (!(editors[0] instanceof ResourceBundleEditor))) {
      return null;
    }

    return (ResourceBundleEditor)editors[0];
  }
}