package com.ycsoft.commons.helper;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.commons.beanutils.BeanUtils;
import com.ycsoft.beans.prod.PPromFeeProd;
/**
* 集合辅助类，包含Java三大集合的处理
*
* @author hh
* @date Dec 3, 2009 1:25:11 PM
*/
public class CollectionHelper {
private CollectionHelper() {}
/**
* 将给定的属性名称propertyName，在数据集中查询对应的JavaBean属性值，
* 将属性值相等的放入新的List ,并添加至Map中。以属性值为map的key值
* @param <T>
* @param data 数据源
* @param keyName 作为主键的属性名称
* @return
*/
public static <T> Map<String, List<T>> converToMap(List<T> data,
String... propertyName) throws Exception {
Map<String, List<T>> map = new HashMap<String, List<T>>();
if (data == null){
return map ;
}
for (int i = 0; i < data.size(); i++) {
T obj = data.get(i);
String key = "";
for (String p : propertyName) {
String value =BeanUtils.getProperty(obj, p);
value=value==null?"null":value;
key += value+"_";
}
key = key.substring(0, key.length()-1);
List<T> list = map.get(key);
if (list == null){
list = new ArrayList<T>();
map.put(key, list);
}
list.add(obj);
}
return map;
}
/**
* 将给定的属性名称propertyName，在数据集中查询对应的JavaBean属性值，
* 将属性propertyName的值作为key,并添加至Map中。propertyName应唯一，否则会出现数据覆盖
* @param <T>
* @param data 数据源
* @param keyName 作为主键的属性名称
* @return
*/
public static <T> Map<String, T> converToMapSingle(List<T> data,
String... propertyName) throws Exception {
Map<String, T> map = new HashMap<String, T>();
if (data == null) {
return map;
}
for (int i = 0; i < data.size(); i++) {
T obj = data.get(i);
String key = "";
for (String p : propertyName) {
String value =BeanUtils.getProperty(obj, p);
value=value==null?"null":value;
key += value+"_";
}
key = key.substring(0, key.length()-1);
map.put(key, obj);
}
return map;
}
/**
* 在给定的数据集中，将每个Map的key与实体类属性名称一致的进行拷贝，
* 支持更深度的拷贝，如实体类中包含另一个JavaBean属性也会进行同样的拷贝。
*
* @param <T> 实体类
* @param data 数据集
* @param entityCls 实体类的class
* @return 转化之后的List
*/
public static <T> List<T> converToEntity(List<Map<String,Object>> data ,Class<T> entityCls)
throws InstantiationException, IllegalAccessException, InvocationTargetException {
List<T> target = new ArrayList<T>();
//检查是否有需要转化的数据
if( null == data || data.size() == 0){
return target;
}
Map<String, Class> complex = BeanHelper.getSimpleOrComplexProperty( entityCls , false);
T temp = null; Object sb = null; String sbpn = null;
for (Map<String, Object> map : data) {
clearNullElement( map );
temp = entityCls.newInstance();
//将Map对应的实体类简单属性值进行拷贝
BeanUtils.populate( temp , map);
Iterator<String> ite = complex.keySet().iterator();
while(ite.hasNext()){
sbpn = ite.next();
sb = complex.get( sbpn ).newInstance();
BeanUtils.populate( sb , map);
BeanUtils.setProperty(temp, sbpn, sb);
}
target.add( temp );
}
return target;
}
/**
* <p> 清空Map中元素值为NULL的元素 </p>
*/
public static void clearNullElement(Map map){
if(map == null) return ;
Object [] vs = map.keySet().toArray();
for (Object o : vs) {
if(null == map.get(o))
map.remove(o);
}
}
public static List<String> converValueToList(List<?> datas, String propertyName)
throws Exception {
List<String> result = new ArrayList<String>();
if (datas == null||datas.size()==0) return result;
for (Object o : datas) {
String v = BeanUtils.getProperty(o, propertyName);
if (StringHelper.isNotEmpty(v))
result.add(v);
}
return result;
}
public static String[] converValueToArray(List<?> datas, String propertyName)
throws Exception {
List<String> result = new ArrayList<String>();
for (Object o : datas) {
String v = BeanUtils.getProperty(o, propertyName);
if (StringHelper.isNotEmpty(v))
result.add(v);
}
return result.toArray(new String[result.size()]);
}
public static<T> void setValues(List<T> datas, String propertyName,
String value) throws IllegalAccessException, InvocationTargetException {
for (T o : datas) {
BeanUtils.setProperty(o, propertyName, value);
}
}
/**
*
* @return 1 a包含b
* 0 互不包含
* -1 b包含a
*/
public static int compare(List<String> a,List<String> b){
if(a.size() == 0 || b.size() == 0){
return 0;
}
if (a.size()<=b.size()){
for (String x:a){
boolean z=false;
for (String y:b){
if (x.equals(y)){
z=true;
break;
}
}
if (!z)
return 0;
}
return -1;
} else {
for (String x:b){
boolean z=false;
for (String y:a){
if (x.equals(y)){
z=true;
break;
}
}
if (!z)
return 0;
}
return 1;
}
}
/**
* 判断集合是否为空(等于null 或者 isEpty).
* @param list
* @return
*/
public static boolean isEmpty(Collection<? extends Object> list) {
return list == null || list.isEmpty();
}
/**
* 判断集合是否<font color ="red">不为空</font>(等于null 或者 isEpty).
* @param list
* @return
*/
public static boolean isNotEmpty(Collection<? extends Object> list) {
return !isEmpty(list);
}
}