package org.argeo.osgi.useradmin;
   
   import java.util.HashMap;
   import java.util.Map;
   
   import javax.naming.directory.Attributes;
   import javax.naming.ldap.LdapName;
   import javax.transaction.xa.XAResource;
   
  /** {@link XAResource} for a user directory being edited. */
  class UserDirectoryWorkingCopy {
  	// private final static Log log = LogFactory
  	// .getLog(UserDirectoryWorkingCopy.class);
  
  	private Map<LdapName, DirectoryUser> newUsers = new HashMap<LdapName, DirectoryUser>();
  	private Map<LdapName, Attributes> modifiedUsers = new HashMap<LdapName, Attributes>();
  	private Map<LdapName, DirectoryUser> deletedUsers = new HashMap<LdapName, DirectoryUser>();
  
  	void cleanUp() {
  		// clean collections
  		newUsers.clear();
  		newUsers = null;
  		modifiedUsers.clear();
  		modifiedUsers = null;
  		deletedUsers.clear();
  		deletedUsers = null;
  	}
  
  	public boolean noModifications() {
  		return newUsers.size() == 0 && modifiedUsers.size() == 0
  				&& deletedUsers.size() == 0;
  	}
  
  	public Attributes getAttributes(LdapName dn) {
  		if (modifiedUsers.containsKey(dn))
  			return modifiedUsers.get(dn);
  		return null;
  	}
  
  	public void startEditing(DirectoryUser user) {
  		LdapName dn = user.getDn();
  		if (modifiedUsers.containsKey(dn))
  			throw new UserDirectoryException("Already editing " + dn);
  		modifiedUsers.put(dn, (Attributes) user.getAttributes().clone());
  	}
  
  	public Map<LdapName, DirectoryUser> getNewUsers() {
  		return newUsers;
  	}
  
  	public Map<LdapName, DirectoryUser> getDeletedUsers() {
  		return deletedUsers;
  	}
  
  	public Map<LdapName, Attributes> getModifiedUsers() {
  		return modifiedUsers;
  	}
  }