Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 zP@\rZ @4
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 M0)ZJti
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 OU^I/TU
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 D$D;'Kij
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分页支持类: qjf4G[]!
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java代码: <K/iX%b?
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package com.javaeye.common.util; {n<1uh9~$8
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import java.util.List; OKj\>3
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publicclass PaginationSupport { P`_Q-vu
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publicfinalstaticint PAGESIZE = 30; X&@>M}
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privateint pageSize = PAGESIZE; Y]B9*^d<
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privateList items; u=#_8e(9Z
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privateint totalCount; 3#F"UG2,_
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privateint[] indexes = newint[0]; N~(?g7
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privateint startIndex = 0;
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public PaginationSupport(List items, int 5fp&!HnG
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totalCount){ <#T#+uO
setPageSize(PAGESIZE); #,!/Cnqis
setTotalCount(totalCount); OPv~1h<[
setItems(items); 3YEw7GIO-
setStartIndex(0); y99|V39'
} Xcg+ SOB
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public PaginationSupport(List items, int h<!!r
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totalCount, int startIndex){ |~Vq"6`
setPageSize(PAGESIZE); G49`a*Jn
setTotalCount(totalCount); !4$o*{9Lx:
setItems(items); "T>;wyGW
setStartIndex(startIndex); S3c%</'
} /AUX7
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public PaginationSupport(List items, int VlxHZ
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totalCount, int pageSize, int startIndex){ \YsLVOv%:d
setPageSize(pageSize); Cv]$w(k
setTotalCount(totalCount); U/\LOIs
setItems(items); N'%l/
setStartIndex(startIndex); r+h$]OJ
} irGgo-x
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publicList getItems(){ jF{\=&fU
return items; 5d)\Z0s
} 4L&Rs;
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publicvoid setItems(List items){ TO]
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this.items = items; ;\Pq
} Z. xOO|
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publicint getPageSize(){ ]"\sd"
return pageSize; Cs^'g'
} w?R#ly
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publicvoid setPageSize(int pageSize){ QY1|:(
this.pageSize = pageSize; "^VPe[lA
} (;++a9GK
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publicint getTotalCount(){ *1U"uJno
return totalCount; qtS+01o
} HQ/ Q"
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publicvoid setTotalCount(int totalCount){ T2XLP
if(totalCount > 0){ l -6W]\v Z
this.totalCount = totalCount; s{0c.M
int count = totalCount / XILreATK@
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pageSize; '77Gg
if(totalCount % pageSize > 0) TK Ec^
count++; l3YS_WBSn
indexes = newint[count]; GbBz;ZV%z,
for(int i = 0; i < count; i++){ 2P?|'U
indexes = pageSize * Q::_i"?c
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} qW9~S0sl
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this.totalCount = 0; 4@Xd(F_d
} j\uPOn8k
} F{
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publicint[] getIndexes(){ b3+F~G-I"
return indexes; OUtMel_
} ~s)
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publicvoid setIndexes(int[] indexes){ p4wx&VLi
this.indexes = indexes; w(!COu
} *o#P)H
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publicint getStartIndex(){ |OO2>(Fj
return startIndex; K,f-
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} VNxhv!w
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publicvoid setStartIndex(int startIndex){ i0{sE
if(totalCount <= 0) [?VkwFD0
this.startIndex = 0; 7DWHADr
elseif(startIndex >= totalCount) 42.y.LtZ
this.startIndex = indexes bA(-7l?
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[indexes.length - 1]; D+CP?} /
elseif(startIndex < 0) b%UbTb,
this.startIndex = 0; 2NZC,znQ
else{ ]+@I]\S4
this.startIndex = indexes $/$ 5{<
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[startIndex / pageSize]; hta y-
} })5I/
} 7tU=5@M9D
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publicint getNextIndex(){ 7H_*1_%ZQ
int nextIndex = getStartIndex() + xtX`3=s
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pageSize; URDXyAt
if(nextIndex >= totalCount) y"Jma`Vjq
return getStartIndex(); FYX"q-Z
else c"`CvQO64
return nextIndex; `(lD]o{,s
} {4HcecT
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publicint getPreviousIndex(){ :o}LJc)|
int previousIndex = getStartIndex() - ~zL DLr=
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pageSize; # 4;(^`?
if(previousIndex < 0) i'uSu8$'*
return0; ^;.&=3N,+
else \EQCR[7qu7
return previousIndex; |)b:@q3k+n
} lD@`xq.M;
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} ko`.nSZ-k
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抽象业务类 )]3_o!o
java代码: ,p9>/)l
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/** [^eQGv[S
* Created on 2005-7-12 T6I$7F
*/ zF#:Uc`C5U
package com.javaeye.common.business; SuFGIb7E
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import java.io.Serializable; V D.T=(
import java.util.List; ]r(s02
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import org.hibernate.Criteria; L_Lhmtm}m
import org.hibernate.HibernateException; @agxu-Y
import org.hibernate.Session; KU*XRZu)
import org.hibernate.criterion.DetachedCriteria; 9;`E,w
import org.hibernate.criterion.Projections; <@J0
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import ECr}7R%
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org.springframework.orm.hibernate3.HibernateCallback; HAdDr!/`
import V~"-\@
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org.springframework.orm.hibernate3.support.HibernateDaoS U\x$@J
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upport; WADAp\&
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import com.javaeye.common.util.PaginationSupport; ,<!v!~Iy
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public abstract class AbstractManager extends r Zg(%6@
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HibernateDaoSupport { #(G"ya
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privateboolean cacheQueries = false; sz+%4T
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privateString queryCacheRegion; .r\|9 *j<
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publicvoid setCacheQueries(boolean
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cacheQueries){ :fA|J!^b[
this.cacheQueries = cacheQueries; /<T3^/ '
} s&F&
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publicvoid setQueryCacheRegion(String _Z_R\
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queryCacheRegion){ I T?~`vi
this.queryCacheRegion = );=0cnr3
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queryCacheRegion; lAJP X
} jAak,[~;
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publicvoid save(finalObject entity){ Y4{/P1F
getHibernateTemplate().save(entity); FqXE6^
} W=\45BJ
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publicvoid persist(finalObject entity){ A&D<}y/%
getHibernateTemplate().save(entity); c)4L3W-x=
} G|.6%-
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publicvoid update(finalObject entity){ DLD 5>
getHibernateTemplate().update(entity); PpezWo)9
} !Wz4BBU8o
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publicvoid delete(finalObject entity){ WYd9p; k
getHibernateTemplate().delete(entity); fxknfgbg
} UT_kw}1o
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publicObject load(finalClass entity, #MUY!
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finalSerializable id){ IZ<Et/3H
return getHibernateTemplate().load /B)`pF.n
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(entity, id); lx:.9>
} V@r V+s
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publicObject get(finalClass entity, dF$&fo%
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finalSerializable id){ `wKd##v'@
return getHibernateTemplate().get Af Y]i
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(entity, id); G.]'pn
} !3`X Gg
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publicList findAll(finalClass entity){ qW`DCZu
return getHibernateTemplate().find("from </!GU*
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" + entity.getName()); m{f+!
} aRy" _dZ2
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publicList findByNamedQuery(finalString Egmp8:nZl@
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namedQuery){ WOi+y
return getHibernateTemplate }U|0F#0$
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().findByNamedQuery(namedQuery); :QIf0*.O
} W/<Lp+p
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publicList findByNamedQuery(finalString query, -f["1-A
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finalObject parameter){ S/dj])g
return getHibernateTemplate z&yVU<;
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().findByNamedQuery(query, parameter); ('Ha$O72
} *#83U?
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publicList findByNamedQuery(finalString query, `#4q7v~>oe
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finalObject[] parameters){ NZz^* Ela
return getHibernateTemplate hWi2S!*Y
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().findByNamedQuery(query, parameters); Cd|rDa
} >4bWXb'S}C
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publicList find(finalString query){ `=%G&_3_<
return getHibernateTemplate().find PLq]\y
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(query); g%okYH?
} >Se-5QtLcf
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publicList find(finalString query, finalObject EQ]>^VE2B
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parameter){ W@RD
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return getHibernateTemplate().find /9o6R:B
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(query, parameter); `jec|i@oO
} .|0$?w
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public PaginationSupport findPageByCriteria =R*IOJ
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(final DetachedCriteria detachedCriteria){ cZ3A~dTOR
return findPageByCriteria A3|2;4t
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); wLxuSs|
} .Hg{$SAC(w
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public PaginationSupport findPageByCriteria )}u?ftu\
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(final DetachedCriteria detachedCriteria, finalint <5zr|BTF]F
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startIndex){ P| ftEF
return findPageByCriteria 8S5Q{[ !
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(detachedCriteria, PaginationSupport.PAGESIZE, MzF,is
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startIndex); *;T'=u_lR
} =3PZGdWD
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public PaginationSupport findPageByCriteria N'0nt]&a
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(final DetachedCriteria detachedCriteria, finalint h6?o)Q>N
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pageSize, G=l:v
finalint startIndex){ l!": s:/'
return(PaginationSupport) bl{W{?QI
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getHibernateTemplate().execute(new HibernateCallback(){ ( dh9aR_a
publicObject doInHibernate /Mj|Px%
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(Session session)throws HibernateException { 5 BeU/
Criteria criteria = (yoF
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detachedCriteria.getExecutableCriteria(session); @2`nBtk
int totalCount = 7Kpv fyL{
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((Integer) criteria.setProjection(Projections.rowCount *+(eH#_2/
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()).uniqueResult()).intValue(); nI] zRduC
criteria.setProjection
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(null); I8|"h8\
List items = >
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criteria.setFirstResult(startIndex).setMaxResults )1 QOA
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(pageSize).list(); aGAr24]y
PaginationSupport ps = r.c:QY$
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new PaginationSupport(items, totalCount, pageSize, [fY7|
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startIndex); 0}po74x*r
return ps; CZ>Ujw=&k
} qRz /$|.
}, true); nRT]oAi
} ])q,mH
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public List findAllByCriteria(final w-C%,1F,/
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DetachedCriteria detachedCriteria){ QB !%
return(List) getHibernateTemplate _C19eW'
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().execute(new HibernateCallback(){ d^`;tD
publicObject doInHibernate iiWpmE<,
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(Session session)throws HibernateException { TD78&a#
Criteria criteria = y1[@4TY]
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detachedCriteria.getExecutableCriteria(session); %*RZxR):
return criteria.list(); h92KU
} X$?0C{@.}
}, true); d(9-T@J
} i 1Kq(7
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public int getCountByCriteria(final h8-uI.RZ
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DetachedCriteria detachedCriteria){ (Ffa{Tt!
Integer count = (Integer) 4~8-^^
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getHibernateTemplate().execute(new HibernateCallback(){ 50a';!H
publicObject doInHibernate &VcO,7 A|
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(Session session)throws HibernateException { 0g; o6Fg
Criteria criteria = I!Mkss xc
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detachedCriteria.getExecutableCriteria(session); rq1zvuUx
return oFT1d
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criteria.setProjection(Projections.rowCount p*Yx1er1
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()).uniqueResult(); <9T,J"y
} b
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}, true); (y1S*_D
return count.intValue(); KHGUR(\Rd6
} )*Wz5x
} tu/4
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用户在web层构造查询条件detachedCriteria,和可选的 fwh/#V-i
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ^:,wk7
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PaginationSupport的实例ps。 o 9(x\g
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ps.getItems()得到已分页好的结果集 O^ 5C
ps.getIndexes()得到分页索引的数组 ;jO+<~YP!
ps.getTotalCount()得到总结果数 |;^$IZSsz
ps.getStartIndex()当前分页索引 lHHx D
ps.getNextIndex()下一页索引 t<RPDQ>
ps.getPreviousIndex()上一页索引 _H-Fm$Q
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 hlz/TIP^N3
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ~QUN O~
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一下代码重构了。 kuq&; uk$Q
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我把原本我的做法也提供出来供大家讨论吧: <*P)"G
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首先,为了实现分页查询,我封装了一个Page类: xsN OjHk
java代码: 3JqGLR`z3
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