| /* |
| * 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.openapi.actionSystem; |
| |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Allows a component hosting actions to provide context information to the actions. When a specific |
| * data item is requested, the component hierarchy is walked up from the currently focused component, |
| * and every component implementing the <code>DataProvider</code> interface is queried for the data |
| * until one of them returns the data. Data items can also be mapped to each other - for example, |
| * if a data provider provides an item for {@link CommonDataKeys#NAVIGATABLE}, an item for |
| * {@link CommonDataKeys#NAVIGATABLE_ARRAY} can be generated from it automatically. |
| * |
| * @see DataContext |
| */ |
| public interface DataProvider { |
| /** |
| * Returns the object corresponding to the specified data identifier. Some of the supported |
| * data identifiers are defined in the {@link com.intellij.openapi.actionSystem.PlatformDataKeys} class. |
| * |
| * @param dataId the data identifier for which the value is requested. |
| * @return the value, or null if no value is available in the current context for this identifier. |
| */ |
| @Nullable |
| Object getData(@NonNls String dataId); |
| } |