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/*--------------------------------------------------------------------------
 *  Copyright 2007 Taro L. Saito
 *
 *  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.
 *--------------------------------------------------------------------------*/
//--------------------------------------
// XerialJ Project
//
// CollectionUtil.java
// Since: May 8, 2007
//
// $URL$ 
// $Author$
//--------------------------------------
package org.xerial.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;

public class CollectionUtil
{

    /**
     * Non constractable class
     */
    private CollectionUtil()
    {}

    public static  List toString(Collection collection)
    {
        ArrayList result = new ArrayList();
        for (In input : collection)
        {
            if (input != null)
                result.add(input.toString());
            else
                result.add(null);
        }
        return result;
    }

    public static  List collectFromNonGenericCollection(Iterable collection, Functor functor)
    {
        ArrayList result = new ArrayList();
        for (In input : collection)
        {
            result.add(functor.apply(input));
        }
        return result;
    }

    public static  List select(Iterable collection, Predicate filter)
    {
        ArrayList result = new ArrayList();
        for (In input : collection)
        {
            if (filter.apply(input))
                result.add(input);
        }
        return result;
    }

    public static  List collect(Iterable collection, Functor functor)
    {
        ArrayList result = new ArrayList();
        for (In input : collection)
        {
            result.add(functor.apply(input));
        }
        return result;
    }

    public static  List collect(In[] collection, Functor functor)
    {
        ArrayList result = new ArrayList();
        for (In input : collection)
        {
            result.add(functor.apply(input));
        }
        return result;
    }

    public static  List