Example usage for java.util Collection clear

Introduction

In this page you can find the example usage for java.util Collection clear.

Prototype

void clear();

Source Link

Document

Removes all of the elements from this collection (optional operation).

Usage

From source file:org.sakaiproject.content.impl.BaseContentService.java

/**
 * {@inheritDoc}// w  w w. jav a2s .  c  om
 */
public Collection getEntityAuthzGroups(Reference ref, String userId) {
    // static code review possible NPE fix -AZ
    if (ref == null || ref.getId() == null) {
        M_log.warn("ref passed into getEntityAuthzGroups is not valid (ref or ref.getId is null): " + ref);
        return null;
    }

    // double check that it's mine
    if (!APPLICATION_ID.equals(ref.getType()))
        return null;

    // form a key for thread-local caching
    String threadLocalKey = "getEntityAuthzGroups@" + userId + "@" + ref.getReference();
    Collection rv = (Collection) threadLocalManager.get(threadLocalKey);
    if (rv != null) {
        return new ArrayList(rv);
    }

    // use the resources realm, all container (folder) realms

    rv = new ArrayList();
    rv.addAll(getEntityHierarchyAuthzGroups(ref));

    try {
        boolean isDropbox = false;
        boolean attachmentOverride = false;
        // special check for group-user : the grant's in the user's My Workspace site
        String parts[] = StringUtil.split(ref.getId(), Entity.SEPARATOR);
        if ((parts.length > 3) && (parts[1].equals("group-user"))) {
            rv.add(m_siteService.siteReference(m_siteService.getUserSiteId(parts[3])));
            isDropbox = true;
        }

        // If this is a site-scoped attachment, use the site grant as the only grant
        // Old attachments format: (use /content/attachment realm)
        //   /content/attachment/guid/filename.pd
        // New attachment format:
        //   /content/attachment/siteid/type/guid/filename.pd
        // But since we need to protect all paths from 
        //   /content/attachment/siteid/
        // and below we simply check to see f the guid is a valid site ID.
        if (m_siteAttachments && (parts.length >= 3) && (parts[1].equals("attachment"))) {
            String siteId = parts[2];
            if (m_siteService.siteExists(siteId)) {
                rv.clear(); // Ignore the hierarchical inheritance in /attachment
                rv.add(m_siteService.siteReference(siteId));
                rv.add(getReference(ref.getId())); // SAK-15657
                attachmentOverride = true; // Nothing else is needed
            }
        }

        ContentEntity entity = null;
        if (ref.getId().endsWith(Entity.SEPARATOR)) {
            entity = findCollection(ref.getId());
        } else {
            entity = findResource(ref.getId());
        }

        // this piece of code only comes into effect when the ref id is not resolveable as is
        if (entity == null) {
            String refId = ref.getId();
            while (entity == null && refId != null && !refId.trim().equals("")) {
                refId = isolateContainingId(refId);
                if (refId != null && !refId.trim().equals("")) {
                    entity = findCollection(refId);
                }
            }
        }

        // this will ensure the NPE does not happen
        if (entity == null) {
            M_log.warn("ref (" + ref + ") is not resolveable as an entity (it is null)");
            return null;
        }

        boolean inherited = false;
        AccessMode access = entity.getAccess();

        if (attachmentOverride) {
            // No further inheritance
        } else if (AccessMode.INHERITED.equals(access)) {
            inherited = true;
            access = entity.getInheritedAccess();
        }
        if (isDropbox || AccessMode.SITE == access || AccessMode.INHERITED == access) {
            // site
            ref.addSiteContextAuthzGroup(rv);
        } else if (AccessMode.GROUPED.equals(access)) {
            String siteReference = m_siteService.siteReference(ref.getContext());
            boolean useSiteAsContext = false;
            if (siteReference != null && userId != null) {
                useSiteAsContext = m_securityService.unlock(userId, AUTH_RESOURCE_ALL_GROUPS, siteReference);
            }
            if (useSiteAsContext) {
                ref.addSiteContextAuthzGroup(rv);
            } else if (inherited) {
                rv.addAll(entity.getInheritedGroups());
            } else {
                rv.addAll(entity.getGroups());
            }
        }
    } catch (Exception e) {
    }

    // cache in the thread
    threadLocalManager.set(threadLocalKey, new ArrayList(rv));

    if (M_log.isDebugEnabled()) {
        M_log.debug("getEntityAuthzGroups for: ref: " + ref.getReference() + " user: " + userId);
        for (Iterator i = rv.iterator(); i.hasNext();) {
            M_log.debug("** -- " + i.next());
        }
    }
    return rv;
}