ListUtil.java
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package com.xiniunet.open.tool;
import com.xiniunet.framework.util.StringUtil;
import com.xiniunet.framework.util.TypeTransferUtil;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Created by xn on 15/7/22.
*/
public class ListUtil {
public static <T> T matchObject(List<T> list,T value) {
if(list == null || list.size() == 0 || value == null){
return null;
}
for(T t : list) {
if(value.equals(t)){
return t;
}
}
return null;
}
public static <T> T matchObject(List<T> list,Long id) {
if(list == null || list.size() == 0 || id == null){
return null;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("getId");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
return t;
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
return null;
}
public static <T,K> T matchObject(List<T> list,String fieldName,K id) {
if(list == null || list.size() == 0 || id == null){
return null;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("get" + StringUtil.upperFirstWord(fieldName));
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
return t;
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
return null;
}
public static <T,K> List<T> matchBatchObject(List<T> list,String fieldName,List<K> ids) {
List<T> result = new ArrayList();
if(list == null || list.size() == 0 || ids == null || ids.size() == 0){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("get" + StringUtil.upperFirstWord(fieldName));
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(K id :ids){
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
result.add(t);
break;
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
}
return result;
}
public static <T> List<T> matchBatchObject(List<T> list,List<Long> ids) {
List<T> result = new ArrayList();
if(list == null || list.size() == 0 || ids == null || ids.size() == 0){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("getId");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(Long id :ids){
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
result.add(t);
break;
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
}
return result;
}
public static <T> List<T> matchList(List<T> list,Long id) {
List<T> result = new ArrayList();
if(list == null || list.size() == 0 || id == null){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("getId");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
result.add(t);
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
return result;
}
public static <T> List<T> matchList(List<T> list,List<Long> ids) {
List<T> result = new ArrayList();
if(list == null || list.size() == 0 || ids == null || ids.size() == 0){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("getId");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(Long id : ids){
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
result.add(t);
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
}
return result;
}
public static <T,K> List<T> matchList(List<T> list,String fieldName,K id) {
List<T> result = new ArrayList();
if(list == null || list.size() == 0 || id == null){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("get" + StringUtil.upperFirstWord(fieldName));
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
result.add(t);
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
return result;
}
public static <T,K> List<T> matchList(List<T> list,String fieldName,List<K> ids) {
List<T> result = new ArrayList();
if(list == null || list.size() == 0 || ids == null || ids.size() == 0){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("get" + StringUtil.upperFirstWord(fieldName));
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
for(K id : ids){
for(T t : list) {
try {
if(id.equals(method.invoke(t))){
result.add(t);
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
}
return result;
}
public static <T> List<Long> getKeyList(List<T> list) {
List<Long> result = new ArrayList();
if(list == null || list.size() == 0){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("getId");
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
Set<Long> set = new HashSet<>();
for(T t : list) {
try {
Long id = (Long)method.invoke(t);
if(id != null){
set.add(id);
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
for(Long id : set){
result.add(id);
}
return result;
}
public static <T,K> List<K> getKeyList(List<T> list,String fieldName) {
List<K> result = new ArrayList();
if(list == null || list.size() == 0){
return result;
}
Class clazz = list.get(0).getClass();
Method method = null;
try {
method = clazz.getMethod("get" + StringUtil.upperFirstWord(fieldName));
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
Set<K> set = new HashSet<>();
for(T t : list) {
try {
K k = (K)method.invoke(t);
if(k != null){
set.add(k);
}
} catch (IllegalAccessException | InvocationTargetException e) {
e.printStackTrace();
}
}
for(K k : set){
result.add(k);
}
return result;
}
public static <T,K> List<T> tranferBatch(List<K> list,Class<T> clazz){
List<T> tList = new ArrayList<>();
for(K k : list){
T t = new TypeTransferUtil<T>().transfer(k,clazz);
tList.add(t);
}
return tList;
}
}