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package com.leftins.tools.ListCom;


import com.leftins.tools.tools.ComUtil;

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

/**
 * @author zhaojiwei YGCollectionHelper 2015年4月16日
 */
public class CollectionHelper {

    public static  T first(Collection list) {
        if (ComUtil.isEmpty(list)) return null;
        int i = 0;
        for (T t : list) {
            if (i++ == 0) {
                return t;
            }
        }
        return null;
    }

    public static  boolean exists(Collection list, IMatch collectionInterface) {
        if (ComUtil.isEmpty(list)) {
            return false;
        }

        for (T t : list) {
            if (collectionInterface.match(t)) {
                return true;
            }
        }
        return false;
    }

    public static  boolean all(Collection list, IMatch collectionInterface) {
        if (ComUtil.isEmpty(list)) {
            return false;
        }

        for (T t : list) {
            if (!collectionInterface.match(t)) {
                return false;
            }
        }
        return true;
    }

    public static  boolean any(Collection list, IMatch collectionInterface) {
        return exists(list, collectionInterface);
    }

    public static  T find(Collection list, IMatch collectionInterface) {
        if (ComUtil.isEmpty(list)) {
            return null;
        }

        for (T t : list) {
            if (collectionInterface.match(t)) {
                return t;
            }
        }
        return null;
    }

    public static  List findAll(Collection list, IMatch collectionInterface) {
        if (ComUtil.isEmpty(list)) {
            return null;
        }

        List ts = new ArrayList<>();
        for (T t : list) {
            if (t != null && collectionInterface.match(t)) {
                ts.add(t);
            }
        }
        return ts;
    }

    public static  List select(Collection list, ISingleMapping singleMappingInterface) {
        if (ComUtil.isEmpty(list)) {
            return null;
        }
        List result = new ArrayList<>();
        for (T t : list) {
            E e = singleMappingInterface.func(t);
            if (e != null) {
                result.add(e);
            }
        }
        return result;
    }

    public static  List selectMany(Collection list, IManyMapping manyMapping) {
        if (ComUtil.isEmpty(list)) {
            return null;
        }

        List result = new ArrayList<>();
        Collection e;
        for (T t : list) {
            e = manyMapping.selectMany(t);
            if (e != null) {
                result.addAll(e);
            }
        }
        return result;
    }

}