/*
 * 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.
 */

/*
 * @author max
 */
package com.intellij.lang;

import com.intellij.lang.documentation.CompositeDocumentationProvider;
import com.intellij.lang.documentation.DocumentationProvider;
import org.jetbrains.annotations.NotNull;

import java.util.List;

public class LanguageDocumentation extends LanguageExtension<DocumentationProvider> {
  public static final LanguageDocumentation INSTANCE = new LanguageDocumentation();

  private LanguageDocumentation() {
    super("com.intellij.lang.documentationProvider");
  }

  @Override
  public DocumentationProvider forLanguage(@NotNull final Language l) {
    final List<DocumentationProvider> providers = allForLanguage(l);
    if (providers.size() < 2) {
      return super.forLanguage(l);
    }
    return CompositeDocumentationProvider.wrapProviders(providers);
  }
}

// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.

/*
 * @author max
 */
package com.intellij.lang;

import com.intellij.lang.documentation.CompositeDocumentationProvider;
import com.intellij.lang.documentation.DocumentationProvider;
import org.jetbrains.annotations.NotNull;

import java.util.List;

public class LanguageDocumentation extends LanguageExtension<DocumentationProvider> {
  public static final LanguageDocumentation INSTANCE = new LanguageDocumentation();

  private LanguageDocumentation() {
    super("com.intellij.lang.documentationProvider");
  }

  /**
   * This method is left to preserve binary compatibility.
   */
  @Override
  public DocumentationProvider forLanguage(@NotNull final Language l) {
    return super.forLanguage(l);
  }

  @Override
  protected DocumentationProvider findForLanguage(@NotNull Language language) {
    final List<DocumentationProvider> providers = allForLanguage(language);
    if (providers.size() < 2) {
      return super.findForLanguage(language);
    }
    return CompositeDocumentationProvider.wrapProviders(providers);
  }
}

Reimplement CompositeDocumentationProvider building so that it can be cached