/*
    * 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.slc.jcr;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.argeo.jcr.JcrUtils;
  import org.argeo.slc.SlcException;
  import org.argeo.slc.SlcNames;
  
  /**
   * Writes arbitrary metadata into a child node of a given node (or the node
   * itself if metadata node name is set to null)
   */
  public class JcrMetadataWriter implements Runnable {
  	private final static Log log = LogFactory.getLog(JcrMetadataWriter.class);
  
  	private Node baseNode;
  	private String metadataNodeName = SlcNames.SLC_METADATA;
  
  	private Map<String, String> metadata = new HashMap<String, String>();
  
  	public void run() {
  		try {
  			Node metadataNode;
  			if (metadataNodeName != null)
  				metadataNode = baseNode.hasNode(metadataNodeName) ? baseNode
  						.getNode(metadataNodeName) : baseNode
  						.addNode(metadataNodeName);
  			else
  				metadataNode = baseNode;
  
  			for (String key : metadata.keySet())
  				metadataNode.setProperty(key, metadata.get(key));
  
  			baseNode.getSession().save();
  
  			if (log.isDebugEnabled())
  				log.debug("Wrote " + metadata.size() + " metadata entries to "
  						+ metadataNode);
  		} catch (RepositoryException e) {
  			throw new SlcException("Cannot write metadata to " + baseNode, e);
  		} finally {
  			JcrUtils.discardUnderlyingSessionQuietly(baseNode);
  		}
  
  	}
  
  	public void setBaseNode(Node baseNode) {
  		this.baseNode = baseNode;
  	}
  
  	public void setMetadataNodeName(String metadataNodeName) {
  		this.metadataNodeName = metadataNodeName;
  	}
  
  	public void setMetadata(Map<String, String> metadata) {
  		this.metadata = metadata;
  	}
  
  }