/*
* Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
* Copyright (C) $$Year-Rel$$ The Jalview Authors
*
* This file is part of Jalview.
*
* Jalview is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Jalview is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Jalview. If not, see .
* The Jalview Authors are detailed in the 'AUTHORS' file.
*/
package jalview.util;
import java.util.Map;
public class MapUtils
{
/**
* Return the value of the first key that exists in the map and has a non-null
* value
*/
public static V getFirst(Map map, K... keys)
{
return getFirst(false, map, keys);
}
/**
* Return the value of the first key that exists in the map - optionally
* limiting to only returning non-null values for first extant key encountered
*/
public static V getFirst(boolean nonNull, Map map, K... keys)
{
for (K key : keys)
{
if (map.containsKey(key))
{
if (!(nonNull && (map.get(key) == null)))
{
return map.get(key);
}
else if (!nonNull)
{
return map.get(key);
}
}
}
return null;
}
/**
* peeks in to the map and returns true if one of a bunch of keys is contained
* in it
*
* @param
* @param map
* @param keys
* @return
*/
public static boolean containsAKey(Map map, K... keys)
{
for (K key : keys)
{
if (map.containsKey(key))
return true;
}
return false;
}
}