/*
    * Copyright 2010 Capgemini and others. 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 net.sf.appstatus.core.property.impl;
  
  import java.io.InputStream;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import javax.servlet.ServletContext;
  
  import net.sf.appstatus.core.IServletContextAware;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Retrieve POM informations for WAR archive.
   * 
   * @author Nicolas Richeton (Capgemini)
   * 
   */
  public class WarMavenVersionProvider extends AbstractPropertyProvider implements IServletContextAware {
  
  	private static final String ARTIFACT_ID = "artifactId";
  	private static final String CATEGORY = "maven";
  	private static final String GROUP_ID = "groupId";
  	private static Logger logger = LoggerFactory.getLogger(WarMavenVersionProvider.class);
  	private static final String NOT_AVAILABLE = "Not available";
  	private static final String VERSION = "version";
  	private ServletContext servletContext = null;
  
  	/**
  	 * {@inheritDoc}
  	 * 
  	 * @see net.sf.appstatus.core.property.IPropertyProvider#getCategory()
  	 */
  	public String getCategory() {
  		return CATEGORY;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 * 
  	 * @see net.sf.appstatus.core.property.IPropertyProvider#getProperties()
  	 */
  	public Map<String, String> getProperties() {
  		InputStream url = null;
  		Properties pomProperties = null;
  		Map<String, String> prop = new HashMap<String, String>();
  		if (this.servletContext != null) {
  			try {
  				url = servletContext.getResourceAsStream(servletContext
  						.getResourcePaths(
  								(String) servletContext.getResourcePaths("/META-INF/maven/").iterator().next())
  						.iterator().next()
  						+ "pom.properties");
  				if (url != null) {
  					pomProperties = new Properties();
  					pomProperties.load(url);
  					url.close();
  				}
  			} catch (Exception e) {
  				logger.info("Error getting maven information from /META-INF/maven/*. Not a maven war.");
  			}
  			if (pomProperties == null) {
  				prop.put(VERSION, NOT_AVAILABLE);
  				prop.put(GROUP_ID, NOT_AVAILABLE);
  				prop.put(ARTIFACT_ID, NOT_AVAILABLE);
  			} else {
  				prop.put(VERSION, pomProperties.getProperty(VERSION));
  				prop.put(GROUP_ID, pomProperties.getProperty(GROUP_ID));
  				prop.put(ARTIFACT_ID, pomProperties.getProperty(ARTIFACT_ID));
  			}
  		}
  
  		return prop;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 * 
  	 * @see net.sf.appstatus.core.IServletContextAware#setServletContext(javax.servlet.ServletContext)
  	 */
  	public void setServletContext(ServletContext servletContext) {
  		this.servletContext = servletContext;
  	}
  
 }