Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 V.OoZGE>]
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 J4R
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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 6I6ZVSxb
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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 1>O0Iu
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分页支持类: 9#=IrlV4
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java代码: D3Ea2}8
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package com.javaeye.common.util; e715)_HD
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import java.util.List; f~(^|~ZT
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publicclass PaginationSupport { oCru 5F
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publicfinalstaticint PAGESIZE = 30; (^OC%pc
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privateint pageSize = PAGESIZE; 3By>t!~Q
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privateList items; 'kONb
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privateint totalCount; j2&OYg
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privateint[] indexes = newint[0]; p`V9+CA
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privateint startIndex = 0; ?9.? w-Q'
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public PaginationSupport(List items, int :$@zX]?M
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totalCount){ kc/H
setPageSize(PAGESIZE); LAjw!QB
setTotalCount(totalCount); mjJlXA
setItems(items); SEn8t"n
setStartIndex(0); <PA$hTYM
} pmXWI`s
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public PaginationSupport(List items, int a/xCl
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totalCount, int startIndex){ '{_tDboY
setPageSize(PAGESIZE); AT8,9
setTotalCount(totalCount); peP:5WB
setItems(items); 5;%xqdD
setStartIndex(startIndex); 9<#R;eIsv
} PyJblW
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public PaginationSupport(List items, int m`w6wz
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totalCount, int pageSize, int startIndex){ J +Y|# U
setPageSize(pageSize); |@4hz9~3
setTotalCount(totalCount); Kof-;T
setItems(items); J'oz P^N
setStartIndex(startIndex); )9P
}
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publicList getItems(){ p{_O*bo
return items; &5CeRx7%
} ]$X=~>w
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publicvoid setItems(List items){ bJu,R-f
this.items = items; TuPxyB
} hYQ%|CBXBR
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publicint getPageSize(){ l@2`f#y1~<
return pageSize; lJp v
} 7VD7di=D
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publicvoid setPageSize(int pageSize){ IQ`aDo-V
this.pageSize = pageSize; m<;" 1<k
} o`]FH_
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publicint getTotalCount(){ &?6~v
return totalCount;
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} trA `l/
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publicvoid setTotalCount(int totalCount){ 8TM=AV
if(totalCount > 0){ K*D]\/; ^
this.totalCount = totalCount; Y2~{q Y
int count = totalCount / 'r3}= z4Y
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pageSize; B3=/iOb#
if(totalCount % pageSize > 0) lY8Qy2k|
count++;
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indexes = newint[count]; *8HxJ+[,[
for(int i = 0; i < count; i++){ 57%cN-v*
indexes = pageSize * ",oUVl
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} ZjID<5#
}else{ (3S/"ZE
this.totalCount = 0; VZl0)YLK
} / S^m!{
} J*k=|+[
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publicint[] getIndexes(){ u8\QhUk'G
return indexes; eJdQ7g[>
} X'p%$HsMG
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publicvoid setIndexes(int[] indexes){ ) FsSXnZL
this.indexes = indexes; S;kc{?
} I!@`_Q9N
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publicint getStartIndex(){ Q|r1.
return startIndex; p 8rAtz>=J
} SQvB)NOw
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publicvoid setStartIndex(int startIndex){ vIv3rN=5vB
if(totalCount <= 0) )^xmy6k
this.startIndex = 0; 2,`mNjHh
elseif(startIndex >= totalCount) V,,iKr@TG
this.startIndex = indexes <\
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[indexes.length - 1]; {[iQRYD0|
elseif(startIndex < 0) "Vy\- ^
this.startIndex = 0; #J9XcD{1
else{ wN.Jyb
this.startIndex = indexes 2?&ptN)`N
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[startIndex / pageSize]; 9&jNdB
} S}yb~uc,
} G9%4d;uFT
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publicint getNextIndex(){ =-Tetp
int nextIndex = getStartIndex() + >eI(M $
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pageSize; -': tpJk
if(nextIndex >= totalCount) an@Ue7
return getStartIndex(); '!GI:U+g
else J>&GP#7}
return nextIndex; ;B@l0)7(x
} B 8,{jwB
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publicint getPreviousIndex(){ M1\/ueOe
int previousIndex = getStartIndex() - OW^7aw(N6
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pageSize; $'w l{D"
if(previousIndex < 0) H|?`n
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return0; l"Q8`
else [sRQd;+
return previousIndex; 0SYkDI
} L x&ZWF$
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} N\$6R-L
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抽象业务类 ml2HA4X&$Y
java代码: ~heF0C_
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/** {cFei3'q
* Created on 2005-7-12 =W=%!A\g
*/ xUUp?]9y
package com.javaeye.common.business; IYFA>*Es
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import java.io.Serializable; l/5/|UE9
import java.util.List; ~czt=
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import org.hibernate.Criteria; xN]bRr
import org.hibernate.HibernateException; *gnL0\*
import org.hibernate.Session; ~[{| s')
import org.hibernate.criterion.DetachedCriteria; %WR
import org.hibernate.criterion.Projections; *4bV8T>0Z
import (~~=<0S
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org.springframework.orm.hibernate3.HibernateCallback; h?b{{
import Ic*Q(X
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org.springframework.orm.hibernate3.support.HibernateDaoS `^/Q"zH
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upport; F=#Wfl-o
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import com.javaeye.common.util.PaginationSupport; \n5,!,A
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public abstract class AbstractManager extends -;v:.
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HibernateDaoSupport { -(jcsqDk
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privateboolean cacheQueries = false; a?;{0I:Ln
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privateString queryCacheRegion; IpWl;i`__
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publicvoid setCacheQueries(boolean \<5xf<{
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cacheQueries){ B\Uj
this.cacheQueries = cacheQueries; 6l4l74
} K
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publicvoid setQueryCacheRegion(String Ne=D$o
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queryCacheRegion){ @'S-nn,sO
this.queryCacheRegion = milU,!7J
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queryCacheRegion; # RtrHm
} +2vcUy
@A:Xct
publicvoid save(finalObject entity){ $I_aHhKt
getHibernateTemplate().save(entity); P%1s6fjU
} H]SnM'Y
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publicvoid persist(finalObject entity){ [u<1DR
getHibernateTemplate().save(entity); GR"Jk[W9
} NJ|8##Z>
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publicvoid update(finalObject entity){ 5[0n'uH
getHibernateTemplate().update(entity); ,ujoGSx}
} 4YKb~1qkk
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publicvoid delete(finalObject entity){ P5[.2y_qM
getHibernateTemplate().delete(entity); C,Ch6Ph
} <h(tW
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publicObject load(finalClass entity, NKRNEq!
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finalSerializable id){ n]|[|Rf1
return getHibernateTemplate().load ZMbv1*Vt
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(entity, id); 'y@0P5[se
} #*5A]"k
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publicObject get(finalClass entity, 9kTU|py
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finalSerializable id){ >*EcX 3
return getHibernateTemplate().get oveW )~4
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(entity, id); TTS}, `
} nXXyX[c4e
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publicList findAll(finalClass entity){ _ u/N#*D
return getHibernateTemplate().find("from $kg!XT{V
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" + entity.getName()); ^[!LU
} iN<Tn8-YH6
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publicList findByNamedQuery(finalString |K7JU^"OQ
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namedQuery){ p^^E(<2
return getHibernateTemplate [Cvo^cC
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().findByNamedQuery(namedQuery); Mvu!
} l\JoWL
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publicList findByNamedQuery(finalString query, yS %J$o&
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finalObject parameter){ ["kk.*&
return getHibernateTemplate V_$ BZm%8J
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().findByNamedQuery(query, parameter); ^F/N-!}q
} C5$1K'X@
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publicList findByNamedQuery(finalString query, UzWf_r
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finalObject[] parameters){ km|;T!
return getHibernateTemplate D<$,v(-
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().findByNamedQuery(query, parameters); !"Jne'f
} nRzD[3I
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publicList find(finalString query){ TmxhP
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return getHibernateTemplate().find :<r.n
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(query); zW+X5yK
} @FKm_q
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publicList find(finalString query, finalObject c|.~f+
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parameter){ }6*+>?
return getHibernateTemplate().find 7o_1PwKS6
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(query, parameter); [H<![Z1*r
} hd0d
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public PaginationSupport findPageByCriteria 2.)xWCG
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(final DetachedCriteria detachedCriteria){ FOV%\=Hl
return findPageByCriteria <#/r.}.x
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); LS;j]!CU
} N1/)Fk-z
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public PaginationSupport findPageByCriteria Hj(ay48
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(final DetachedCriteria detachedCriteria, finalint tQ~vLPi$
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startIndex){ }.*"ezaZw
return findPageByCriteria ^F\RM4|,
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(detachedCriteria, PaginationSupport.PAGESIZE, w(Jf;[o
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startIndex); VS`
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} )c*NS7D~f
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public PaginationSupport findPageByCriteria ]]Bqte
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(final DetachedCriteria detachedCriteria, finalint a9LK}xc={
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pageSize, G42J
finalint startIndex){ D@W[Nd5MJ
return(PaginationSupport) +>b m~6
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getHibernateTemplate().execute(new HibernateCallback(){ oz8z%*9(
publicObject doInHibernate LK>AC9ak<
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(Session session)throws HibernateException { !m {d6C[
Criteria criteria = 9N[(f-`
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detachedCriteria.getExecutableCriteria(session); t_xO-fT)
int totalCount = Th.Mn}1%L
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((Integer) criteria.setProjection(Projections.rowCount jK(]eiR$S
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()).uniqueResult()).intValue(); npCiqO
criteria.setProjection iVaCX Xf '
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(null); 6 Mc&gnN
List items = C}'Tmi
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criteria.setFirstResult(startIndex).setMaxResults 0 k(su
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(pageSize).list(); _8 C:Md`
PaginationSupport ps = F`Ld
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new PaginationSupport(items, totalCount, pageSize, :aHLr[%Mz
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startIndex); dje}CbZ
return ps; {t%Jc~p{
} VN/v]
}, true); wZnv*t_
} aj`_*T"A
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public List findAllByCriteria(final 7[I%UP
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DetachedCriteria detachedCriteria){ B:]%Iu|
return(List) getHibernateTemplate al1Nmc#
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().execute(new HibernateCallback(){
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publicObject doInHibernate vuoD~ =z
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(Session session)throws HibernateException { b?]Lx.l-
Criteria criteria = @,Kl"i;
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detachedCriteria.getExecutableCriteria(session); 0-at#r:
return criteria.list(); ;^DG P
} cCBYM
}, true); _O;2.M%@
} 231,v,X[
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public int getCountByCriteria(final We)l_>G
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DetachedCriteria detachedCriteria){ ?B['8ju
Integer count = (Integer) AI,Jy%62/
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getHibernateTemplate().execute(new HibernateCallback(){ L/KiE+Y
publicObject doInHibernate UAEu.AT
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(Session session)throws HibernateException { nvbKW.[<f{
Criteria criteria = VdOcKP.
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detachedCriteria.getExecutableCriteria(session); '`sZo1x%f
return fWs @ZCt
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criteria.setProjection(Projections.rowCount G7NRpr
[ f;o3
()).uniqueResult(); ZwOX ,D
} (~N[j;W,_W
}, true); @/W~lJ!e
return count.intValue(); AU4K$hC^
} z(eAhK}6?
} +)ba9bJ|
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用户在web层构造查询条件detachedCriteria,和可选的 N~|Z@pU"
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 `6xr:s
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PaginationSupport的实例ps。 } /*U~!t
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ps.getItems()得到已分页好的结果集 Q N]y.(S)y
ps.getIndexes()得到分页索引的数组 7q(A&
ps.getTotalCount()得到总结果数 ]Ns)fr6
ps.getStartIndex()当前分页索引 fM`.v+
ps.getNextIndex()下一页索引 7S2"e[-x
ps.getPreviousIndex()上一页索引 i:60|ngK
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 $38)_{
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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 ~P BJ~j+G
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一下代码重构了。 d:pGdr& .
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我把原本我的做法也提供出来供大家讨论吧: 4L_)@n}
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首先,为了实现分页查询,我封装了一个Page类: &y&HxV
java代码: s:3b. *t<
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/*Created on 2005-4-14*/ 20# V?hX3
package org.flyware.util.page; &z#`Qa3NI
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/** G@txX
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* @author Joa k [LV^oEg
* >a&IFi,j
*/ ^YJ%^P
publicclass Page { ~+C)0Yn
&M: