/*
 * Copyright (c) 2011 Google Inc.
 *
 * All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution, and is available at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 */
package com.google.eclipse.protobuf.ui.documentation;

import static org.eclipse.xtext.util.Strings.isEmpty;

import static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.documentation.IEObjectDocumentationProvider;

import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * Provides single-line and multi-line comments as documentation of a protobuf
 * element.
 *
 * @author alruiz@google.com (Alex Ruiz)
 */
@Singleton public class ProtobufDocumentationProvider implements IEObjectDocumentationProvider {
  private final List<IEObjectDocumentationProvider> delegates;

  @Inject public ProtobufDocumentationProvider(SLCommentDocumentationProvider p1, MLCommentDocumentationProvider p2) {
    delegates = newArrayList(p1, p2);
  }

  /** {@inheritDoc} */
  @Override public String getDocumentation(EObject o) {
    for (IEObjectDocumentationProvider p : delegates) {
      String documentation = p.getDocumentation(o);
      if (!(isEmpty(documentation))) {
        return documentation;
      }
    }
    return "";
  }
}