Examples of org.apache.shiro.session.Session.removeAttribute()

org.apache.shiro.session.Session.removeAttribute()
Removes (unbinds) the object bound to this session under the specified {@code key} name. @param key the name uniquely identifying the object to remove @return the object removed or {@code null} if there was no object bound under the name{@code key}. @throws InvalidSessionException if this session has stopped or expired prior to callingthis method.

            PrincipalCollection existingPrincipals =
                    (PrincipalCollection) session.getAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);


            if (CollectionUtils.isEmpty(currentPrincipals)) {
                if (!CollectionUtils.isEmpty(existingPrincipals)) {
                    session.removeAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
                }
                //otherwise both are null or empty - no need to update the session
            } else {
                if (!currentPrincipals.equals(existingPrincipals)) {
                    session.setAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY, currentPrincipals);

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                }
                //otherwise authc state matches - no need to update the session
            } else {
                if (existingAuthc != null) {
                    //existing doesn't match the current state - remove it:
                    session.removeAttribute(DefaultSubjectContext.AUTHENTICATED_SESSION_KEY);
                }
                //otherwise not in the session and not authenticated - no need to update the session
            }
        }
    }

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     * @param subject the subject for which any existing subject state will be removed from its session.
     */
    protected void removeFromSession(Subject subject) {
        Session session = subject.getSession(false);
        if (session != null) {
            session.removeAttribute(DefaultSubjectContext.AUTHENTICATED_SESSION_KEY);
            session.removeAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
        }
    }


    /**

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     */
    protected void removeFromSession(Subject subject) {
        Session session = subject.getSession(false);
        if (session != null) {
            session.removeAttribute(DefaultSubjectContext.AUTHENTICATED_SESSION_KEY);
            session.removeAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
        }
    }


    /**
     * Removes any existing subject state from the subject's session (if the session exists).

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    public static SavedRequest getAndClearSavedRequest(ServletRequest request) {
        SavedRequest savedRequest = getSavedRequest(request);
        if (savedRequest != null) {
            Subject subject = SecurityUtils.getSubject();
            Session session = subject.getSession();
            session.removeAttribute(SAVED_REQUEST_KEY);
        }
        return savedRequest;
    }


    public static SavedRequest getSavedRequest(ServletRequest request) {

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            PrincipalCollection existingPrincipals =
                    (PrincipalCollection) session.getAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);


            if (CollectionUtils.isEmpty(currentPrincipals)) {
                if (!CollectionUtils.isEmpty(existingPrincipals)) {
                    session.removeAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
                }
                //otherwise both are null or empty - no need to update the session
            } else {
                if (!currentPrincipals.equals(existingPrincipals)) {
                    session.setAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY, currentPrincipals);

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                }
                //otherwise authc state matches - no need to update the session
            } else {
                if (existingAuthc != null) {
                    //existing doesn't match the current state - remove it:
                    session.removeAttribute(DefaultSubjectContext.AUTHENTICATED_SESSION_KEY);
                }
                //otherwise not in the session and not authenticated - no need to update the session
            }
        }
    }

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     * @param subject the subject for which any existing subject state will be removed from its session.
     */
    protected void removeFromSession(Subject subject) {
        Session session = subject.getSession(false);
        if (session != null) {
            session.removeAttribute(DefaultSubjectContext.AUTHENTICATED_SESSION_KEY);
            session.removeAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
        }
    }


    /**

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     */
    protected void removeFromSession(Subject subject) {
        Session session = subject.getSession(false);
        if (session != null) {
            session.removeAttribute(DefaultSubjectContext.AUTHENTICATED_SESSION_KEY);
            session.removeAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
        }
    }


    /**
     * Removes any existing subject state from the subject's session (if the session exists).

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    }


    private void clearRunAsIdentities() {
        Session session = getSession(false);
        if (session != null) {
            session.removeAttribute(RUN_AS_PRINCIPALS_SESSION_KEY);
        }
    }


    private void pushIdentity(PrincipalCollection principals) throws NullPointerException {
        if (CollectionUtils.isEmpty(principals)) {

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