question: check existence of the session participant concode_field_sep String extIDPSessionID concode_elem_sep LogoutRequestData logoutRequestData concode_elem_sep IDPConfig extIDPUsed concode_elem_sep Lock lock concode_elem_sep PrincipalId principalId concode_elem_sep Date expireDate concode_elem_sep AuthnMethod authnMethod concode_elem_sep long serialVersionUID concode_elem_sep String id concode_elem_sep Map<String,SessionParticipant> participantsByUrl concode_elem_sep Map<String,SessionParticipant> participants concode_elem_sep boolean usingExtIDP concode_field_sep String ensureSessionParticipant concode_elem_sep String getExtIDPSessionID concode_elem_sep PrincipalId getPrincipalId concode_elem_sep String getId concode_elem_sep boolean isUsingExtIDP concode_elem_sep boolean containsSessionParticipantUrl concode_elem_sep int hashCode concode_elem_sep void setLogoutRequestData concode_elem_sep void addSessionParticipant concode_elem_sep Date getExpireDate concode_elem_sep void setExtIDPSessionID concode_elem_sep void setExtIDPToUsed concode_elem_sep void removeSessionParticipant concode_elem_sep Lock getLock concode_elem_sep String participantsToString concode_elem_sep void removeSessionParticipantByUrl concode_elem_sep LogoutRequestData getLogoutRequestData concode_elem_sep boolean isValid concode_elem_sep IDPConfig getExtIDPUsed concode_elem_sep AuthnMethod getAuthnMethod concode_elem_sep void setUsingExtIDP concode_elem_sep SessionParticipant getSessionParticipant concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep Collection<SessionParticipant> getSessionParticipants
target: boolean function ( String arg0 ) { Validate . notNull ( arg0 ) ; return this . participants . containsKey ( arg0 ) ; }