package com.matrix.system.hive.plugin.util;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import net.sf.json.JSONArray;
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/**
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* 集合工具类包括集合转换，判断空等
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* @author Ron
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* @createTime 2014.08.30
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*/
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public class CollectionUtils {
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/**
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* 将map转为list
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*
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* @param map
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* @return
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*/
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public static <T> List<T> mapToList(Map<String, T> map) {
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if (map == null || map.size() < 1) {
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return null;
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}
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List<T> result = new ArrayList<T>();
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for (Entry<String, T> entry : map.entrySet()) {
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result.add(entry.getValue());
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}
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return result;
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}
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/**
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* 将list转为set，注意：有肯存在覆盖情况
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*
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* @param list
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* @return
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*/
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public static <T> Set<T> listToSet(List<T> list) {
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if (list == null || list.size() < 1) {
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return null;
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}
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Set<T> result = new HashSet<T>();
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for (T t : list) {
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result.add(t);
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}
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return result;
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}
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/**
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* 把src中的添加到target
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*
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* @param target
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* @param src
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* @return
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*/
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public static <T> Set<T> mergeSet(Set<T> target, Set<T> src) {
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if (target == null) {
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return src;
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}
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if (src == null) {
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return target;
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}
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for (T t : src) {
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target.add(t);
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}
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return target;
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}
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/**
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* 把src中的添加到target
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*
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* @param target
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* @param src
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* @return
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*/
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public static <T> List<T> mergeList(List<T> target, List<T> src) {
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if (target == null) {
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return src;
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}
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if (src == null) {
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return target;
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}
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for (T t : src) {
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target.add(t);
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}
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return target;
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}
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/**
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* 把src中的添加到target
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*
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* @param target
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* @param src
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* @return
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*/
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public static <T> Map<Object, T> mergeMap(Map<Object, T> target, Map<Object, T> src) {
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if (target == null) {
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return src;
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}
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if (src == null) {
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return target;
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}
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for (Entry<Object, T> t : src.entrySet()) {
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target.put(t.getKey(), t.getValue());
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}
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return target;
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static <T> boolean isEmpty(List<T> list) {
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if (list == null || list.size() <= 0) {
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return true;
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}
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return false;
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static <T> boolean isNotEmpty(List<T> list) {
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return !isEmpty(list);
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static <T> boolean isEmpty(Map<String, T> map) {
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if (map == null || map.size() <= 0) {
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return true;
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}
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return false;
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static <T> boolean isNotEmpty(Map<String, T> map) {
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return !isEmpty(map);
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static boolean isEmpty(Object[] list) {
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if (list == null || list.length <= 0) {
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return true;
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}
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return false;
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static boolean isEmptys(JSONArray json) {
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if (json == null || json.size() <= 0) {
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return true;
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}
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return false;
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}
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/**
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* 是否为空
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*
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* @param list
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* @return
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*/
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public static boolean isNotEmpty(Object[] list) {
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return !isEmpty(list);
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}
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/**
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* 拷贝
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*
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* @param dest
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* @param src
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*/
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@SuppressWarnings("unchecked")
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public static <T> List<T> copy(List<? super T> dest, List<? extends T> src) {
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if (dest == null || dest.size() < src.size()) {
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dest = new ArrayList<Object>(Arrays.asList(new Object[src.size()]));
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}
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Collections.copy(dest, src);
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return (List<T>) dest;
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}
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/**
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* 将dest中的包含src中部分删除
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*
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* @param dest
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* @param src
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* @return
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*/
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@SuppressWarnings("unchecked")
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public static <T> List<T> findExclude(List<? extends T> dest, List<? extends T> src) {
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if (dest == null) {
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return null;
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}
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if (src == null) {
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return (List<T>) dest;
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}
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List<T> list = new ArrayList<T>();
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boolean flag = false;
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for (T destT : dest) {
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flag = false;
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for (T srcT : src) {
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if (srcT.equals(destT)) {
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flag = true;
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break;
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}
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}
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if (!flag) {
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list.add(destT);
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}
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}
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return list;
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}
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}
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