/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.argeo.cms.ui.jcr.model;
  
  import javax.jcr.Repository;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.argeo.eclipse.ui.EclipseUiException;
  import org.argeo.eclipse.ui.TreeParent;
  import org.argeo.jcr.JcrUtils;
  
  /**
   * UI Tree component that wraps a JCR {@link Repository}. It also keeps a
   * reference to its parent Tree Ui component; typically the unique
   * {@link RepositoriesElem} object of the current view to enable bi-directionnal
   * browsing in the tree.
   */
  
  public class RepositoryElem extends TreeParent {
  	private String alias;
  	protected Repository repository;
  	private Session defaultSession = null;
  
  	/** Create a new repository with distinct name and alias */
  	public RepositoryElem(String alias, Repository repository, TreeParent parent) {
  		super(alias);
  		this.repository = repository;
  		setParent(parent);
  		this.alias = alias;
  	}
  
  	public void login() {
  		try {
  			defaultSession = repositoryLogin("main");
  			String[] wkpNames = defaultSession.getWorkspace().getAccessibleWorkspaceNames();
  			for (String wkpName : wkpNames) {
  				if (wkpName.equals(defaultSession.getWorkspace().getName()))
  					addChild(new WorkspaceElem(this, wkpName, defaultSession));
  				else
  					addChild(new WorkspaceElem(this, wkpName));
  			}
  		} catch (RepositoryException e) {
  			throw new EclipseUiException("Cannot connect to repository " + alias, e);
  		}
  	}
  
  	public synchronized void logout() {
  		for (Object child : getChildren()) {
  			if (child instanceof WorkspaceElem)
  				((WorkspaceElem) child).logout();
  		}
  		clearChildren();
  		JcrUtils.logoutQuietly(defaultSession);
  		defaultSession = null;
  	}
  
  	/**
  	 * Actual call to the {@link Repository#login(javax.jcr.Credentials, String)}
  	 * method. To be overridden.
  	 */
  	protected Session repositoryLogin(String workspaceName) throws RepositoryException {
  		return repository.login(workspaceName);
  	}
  
  	public String[] getAccessibleWorkspaceNames() {
  		try {
  			return defaultSession.getWorkspace().getAccessibleWorkspaceNames();
  		} catch (RepositoryException e) {
  			throw new EclipseUiException("Cannot retrieve workspace names", e);
  		}
  	}
  
  	public void createWorkspace(String workspaceName) {
  		if (!isConnected())
  			login();
  		try {
  			defaultSession.getWorkspace().createWorkspace(workspaceName);
  		} catch (RepositoryException e) {
  			throw new EclipseUiException("Cannot create workspace", e);
  		}
  	}
  
  	/** returns the {@link Repository} referenced by the current UI Node */
  	public Repository getRepository() {
  		return repository;
 	}
 
 	public String getAlias() {
 		return alias;
 	}
 
 	public Boolean isConnected() {
 		if (defaultSession != null && defaultSession.isLive())
 			return true;
 		else
 			return false;
 	}
 }