/*
 * 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.model.util;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.xtext.naming.QualifiedName;

import com.google.eclipse.protobuf.util.StringLists;
import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * Utility methods related to <code>{@link QualifiedName}</code>s.
 *
 * @author alruiz@google.com (Alex Ruiz)
 */
@Singleton
public class QualifiedNames {
  @Inject private StringLists stringLists;

  public static QualifiedName removeLeadingDot(QualifiedName name) {
    String firstSegment = name.getFirstSegment();
    if (firstSegment != null && firstSegment.isEmpty()) {
      return name.skipFirst(1);
    }
    return name;
  }

  public QualifiedName addLeadingDot(QualifiedName name) {
    if (name.getFirstSegment().isEmpty()) {
      return name;
    }
    List<String> segments = new ArrayList<>();
    segments.addAll(name.getSegments());
    segments.add(0, "");
    return createQualifiedName(segments);
  }

  public QualifiedName createQualifiedName(List<String> segments) {
    return QualifiedName.create(stringLists.toArray(segments));
  }
}