platform/lang-api/src/com/intellij/lang/documentation/ExternalDocumentationProvider.java

/*
 * Copyright 2000-2010 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.
 */

/*
 * User: anna
 * Date: 02-Mar-2010
 */
package com.intellij.lang.documentation;

import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import org.jetbrains.annotations.Nullable;

import java.util.List;

public interface ExternalDocumentationProvider {
  @Nullable
  String fetchExternalDocumentation(final Project project, PsiElement element, final List<String> docUrls);

  /**
   * Quick check for existence of external documentation for specified element. Called from action update, so must be fast.
   * If not implemented, update check is performed by calling {@link DocumentationProvider#getUrlFor(com.intellij.psi.PsiElement, com.intellij.psi.PsiElement)}.
   *
   * @param element the element to check for existence of documentation
   * @param originalElement the element at caret (on which the action was invoked)
   * @return true if the external documentation action should be enabled, false otherwise.
   */
  boolean hasDocumentationFor(PsiElement element, PsiElement originalElement);

  /**
   * Checks if the provider is capable of asking the user to configure external documentation for an element.
   *
   * @param element the element for which no documentation was found
   * @return true if the element is applicable to this provider and the provider has a UI to configure the documentation location, false otherwise
   */
  boolean canPromptToConfigureDocumentation(PsiElement element);

  /**
   * Prompts the user to configure the external documentation for an element if none was found.
   *
   * @param element the element for which no documentation was found
   */
  void promptToConfigureDocumentation(PsiElement element);
}