直接上代码,缺包的自行替换为自己项目中存在的
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import cn.hutool.core.util.ObjectUtil;
/**
* @description:数据列表关联,类似于sql中的join
* @author: Binz
* @time:2019-09-29 09:40
*/
public class Java8Util {
private static final Logger logger = LoggerFactory.getLogger(Java8Util.class);
/\*\*
\* @description:关联到主表的基本类型属性去 一对多
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: toT1ListProperty 需要赋值到t1的List属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:Java8Util.joinToList(users, roles, User::getId, Role::getUserId, User::setRoles);
\* </pre>
\*/
public static <P,C,JR> void joinToList(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,BiConsumer<P,List<C>> toT1ListProperty) {
try {
Map<Object,List<C>> valueMap = new HashMap<>();
JR t2JoinValue;
for (C c : t2) {
t2JoinValue = t2JoinKey.apply(c);
valueMap.putIfAbsent(t2JoinValue, new ArrayList<>());
valueMap.get(t2JoinValue).add(c);
}
JR t1JoinValue;
List<C> list;
for (P p : t1) {
t1JoinValue = t1JoinKey.apply(p);
list = valueMap.get(t1JoinValue);
toT1ListProperty.accept(p, list);
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对多
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: getT2PropertyKey 获取t2指定属性
\* @param: toT1ListProperty 需要赋值到t1的List属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:Java8Util.joinToListProperty(users, roles, User::getId, Role::getUserId, Role::Id ,Role::getName , User::setRoleNames);
\* </pre>
\*/
public static <P,C,JR,SR> void joinToListProperty(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,Function<C, SR> getT2PropertyKey ,BiConsumer<P,List<SR>> toT1PropertyKey) {
try {
Map<Object,List<SR>> valueMap = new HashMap<>();
JR t2JoinValue;
for (C c : t2) {
t2JoinValue = t2JoinKey.apply(c);
valueMap.putIfAbsent(t2JoinValue, new ArrayList<>());
valueMap.get(t2JoinValue).add(getT2PropertyKey.apply(c));
}
JR t1JoinValue;
List<SR> list;
for (P p : t1) {
t1JoinValue = t1JoinKey.apply(p);
list = valueMap.get(t1JoinValue);
toT1PropertyKey.accept(p,list);
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
public static <P,C,JR,SR> void joinToSetProperty(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,Function<C, SR> getT2PropertyKey ,BiConsumer<P,Set<SR>> toT1PropertyKey) {
try {
Map<Object,Set<SR>> valueMap = new HashMap<>();
JR t2JoinValue;
for (C c : t2) {
t2JoinValue = t2JoinKey.apply(c);
valueMap.putIfAbsent(t2JoinValue, new HashSet<>());
valueMap.get(t2JoinValue).add(getT2PropertyKey.apply(c));
}
JR t1JoinValue;
Set<SR> list;
for (P p : t1) {
t1JoinValue = t1JoinKey.apply(p);
list = valueMap.get(t1JoinValue);
toT1PropertyKey.accept(p,list);
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对一
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: toT1PropertyKey 把t2 设置到 t1指定的属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:joinToEntity(users, accountss, User::getId, Account::getUserId, User::setAccount);
\* </pre>
\*/
public static <P,C,JR> void joinToEntity(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,BiConsumer<P,C> toT1EntityProperty) {
try {
Map<Object,List<P>> m1 = new HashMap<>(t1.size());
Object t1KeyValue;
for (P p : t1) {
t1KeyValue = t1JoinKey.apply(p);
m1.putIfAbsent(t1KeyValue, new ArrayList<>());
m1.get(t1KeyValue).add(p);
}
Object t2JoinKeyValue;
List<P> ps;
for (C c : t2) {
t2JoinKeyValue = t2JoinKey.apply(c);
ps = m1.get(t2JoinKeyValue);
if(ps != null) {
for (P p : ps) {
toT1EntityProperty.accept(p, c);
}
}
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对一
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: getT2PropertyKey 从t2获取某一个值
\* @param: toT1PropertyKey 把t2获取到的值设置到 t1指定的属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:joinToEntity(users, accountss, User::getId, Account::getUserId, User::setAccount);
\* </pre>
\*/
public static <P,C,JR> void joinToEntityByFilter(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,Predicate<P> t1Filter,Predicate<C> t2Filter,BiConsumer<P,C> toT1EntityProperty) {
try {
Map<Object,List<P>> m1 = new HashMap<>(t1.size());
Object t1KeyValue;
for (P p : t1) {
if(t1Filter == null || t1Filter.test(p)) {
t1KeyValue = t1JoinKey.apply(p);
m1.putIfAbsent(t1KeyValue, new ArrayList<>());
m1.get(t1KeyValue).add(p);
}
}
Object t2JoinKeyValue;
List<P> ps;
for (C c : t2) {
if(t2Filter == null || t2Filter.test(c)) {
t2JoinKeyValue = t2JoinKey.apply(c);
ps = m1.get(t2JoinKeyValue);
if(ps != null) {
for (P p : ps) {
toT1EntityProperty.accept(p, c);
}
}
}
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对一
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: getT2PropertyKey 从t2获取某一个值
\* @param: toT1PropertyKey 把t2获取到的值设置到 t1指定的属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:joinToProperty(users, persons, User::getId, Person::getUserId, Person::getRealName User::setRealName);
\* </pre>
\*/
public static <P,C,JR,SR> void joinToProperty(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,Function<C, SR> getT2PropertyKey ,BiConsumer<P,SR> toT1PropertyKey) {
try {
Map<Object,List<P>> m1 = new HashMap<>(t1.size());
Object t1KeyValue;
for (P p : t1) {
t1KeyValue = t1JoinKey.apply(p);
m1.putIfAbsent(t1KeyValue, new ArrayList<>());
m1.get(t1KeyValue).add(p);
}
Object t2JoinKeyValue;
List<P> ps;
for (C c : t2) {
t2JoinKeyValue = t2JoinKey.apply(c);
ps = m1.get(t2JoinKeyValue);
if(ps != null) {
for (P p : ps) {
toT1PropertyKey.accept(p, getT2PropertyKey.apply(c));
}
}
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对一
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: t1Filter 表一过滤 可为空
\* @param: t2Filter 表二过滤 可为空
\* @param: getT2PropertyKey 从t2获取某一个值
\* @param: toT1PropertyKey 把t2获取到的值设置到 t1指定的属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:
\* joinToPropertyByFilter(users, persons, User::getPersonId, Person::getId, e -> {
return e.getId() != null && e.getId() > 3;
},null, Person::getRealName, User::setRealName);
\* </pre>
\*/
public static <P,C,JR,SR> void joinToPropertyByFilter(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,Predicate<P> t1Filter,Predicate<C> t2Filter,Function<C, SR> getT2PropertyKey ,BiConsumer<P,SR> toT1PropertyKey) {
try {
Map<Object,List<P>> m1 = new HashMap<>(t1.size());
Object t1KeyValue;
for (P p : t1) {
if(t1Filter == null || t1Filter.test(p)) {
t1KeyValue = t1JoinKey.apply(p);
m1.putIfAbsent(t1KeyValue, new ArrayList<>());
m1.get(t1KeyValue).add(p);
}
}
Object t2JoinKeyValue;
List<P> ps;
for (C c : t2) {
if(t2Filter == null || t2Filter.test(c)) {
t2JoinKeyValue = t2JoinKey.apply(c);
ps = m1.get(t2JoinKeyValue);
if(ps != null) {
for (P p : ps) {
toT1PropertyKey.accept(p, getT2PropertyKey.apply(c));
}
}
}
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对一
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: getT2PropertyKey 从t2获取某一个值
\* @param: toT1PropertyKey 把t2获取到的值设置到 t1指定的属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:
\* joinToPropertys(users, persons, User::getPersonId, Person::getId, (user,person)->{
\* user.setRealName("乱设置的"+person.getId());
\* user.setAge(person.getAge());
\* });
\* </pre>
\*/
public static <P,C,JR,SR> void joinToPropertys(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey,BiConsumer<P,C> toT1Propertys) {
try {
Map<Object,List<P>> m1 = new HashMap<>(t1.size());
Object t1KeyValue;
for (P p : t1) {
t1KeyValue = t1JoinKey.apply(p);
m1.putIfAbsent(t1KeyValue, new ArrayList<>());
m1.get(t1KeyValue).add(p);
}
Object t2JoinKeyValue;
List<P> ps;
for (C c : t2) {
t2JoinKeyValue = t2JoinKey.apply(c);
ps = m1.get(t2JoinKeyValue);
if(ps != null) {
for (P p : ps) {
toT1Propertys.accept(p, c);
}
}
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* @description:关联到主表的基本类型属性去 一对一
\* @param: t1 主表
\* @param: t2 关联表
\* @param: t1JoinKey 主表的关联key
\* @param: t2JoinKey 关联表的关联key
\* @param: getT2PropertyKey 从t2获取某一个值
\* @param: toT1PropertyKey 把t2获取到的值设置到 t1指定的属性
\* @return
\* @author: Binz
\* @time:2019-09-29 09:44
\* <pre>
\* 例如:
\* joinToPropertysByFilter(users, persons, User::getPersonId, Person::getId , e -> {
return e.getId() != null && e.getId() > 3;
}, (t1,t2)->{
t1.setRealName("有过滤的乱设置的"+t2.getId());
t2.setAge(1);
});
\* </pre>
\*/
public static <P,C,JR,SR> void joinToPropertysByFilter(Collection<P> t1, Collection<C> t2,Function<P, JR> t1JoinKey ,Function<C,JR> t2JoinKey , Predicate<P> t1Filter,BiConsumer<P,C> toT1Propertys) {
try {
Map<Object,List<P>> m1 = new HashMap<>(t1.size());
Object t1KeyValue;
for (P p : t1) {
if(t1Filter.test(p)) {
t1KeyValue = t1JoinKey.apply(p);
m1.putIfAbsent(t1KeyValue, new ArrayList<>());
m1.get(t1KeyValue).add(p);
}
}
Object t2JoinKeyValue;
List<P> ps;
for (C c : t2) {
t2JoinKeyValue = t2JoinKey.apply(c);
ps = m1.get(t2JoinKeyValue);
if(ps != null) {
for (P p : ps) {
toT1Propertys.accept(p, c);
}
}
}
} catch (Exception e) {
logger.error( ExceptionUtils.getStackTrace(e));
}
}
/\*\*
\* 通用递归,使用示例
\* <br/>List<DepartmentTreeVo> list = new ArrayList<>();
\* <br/>Java8Util.recursion(departmentTree, DepartmentTreeVo::getChildren, t -> {
\* <br/> list.add(t);
\* <br/>});
\* @param ts
\* @param childsFn
\* @param then
\*/
public static <T> void recursion(List<T> ts, Function<T, List<T>> childsFn , Consumer<T> then) {
for(T t : ts) {
then.accept(t);
}
for(T t : ts) {
List<T> childs = childsFn.apply(t);
if(ObjectUtil.isNotEmpty(childs)) {
recursion(childs, childsFn, then);
}
}
}
}
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