/*
    * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
    * the spring framework, http://el4j.sf.net
    * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
    * 1000 Lausanne, Switzerland, http://www.elca.ch
    *
    * EL4J is published under the GNU Lesser General Public License (LGPL)
    * Version 2.1. See http://www.gnu.org/licenses/
    *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU Lesser General Public License for more details.
   *
   * For alternative licensing, please contact info@elca.ch
   */
  
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  package ch.elca.el4j.services.xmlmerge.tool;
  
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Properties;
  
  import ch.elca.el4j.services.xmlmerge.XmlMerge;
  import ch.elca.el4j.services.xmlmerge.config.ConfigurableXmlMerge;
  import ch.elca.el4j.services.xmlmerge.config.PropertyXPathConfigurer;
  import ch.elca.el4j.services.xmlmerge.merge.DefaultXmlMerge;
  
  /**
   * XmlMerge as a Command-line tool.
   *
   * @svnLink $Revision: 3884 $;$Date: 2009-08-04 15:48:31 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/xml_merge/console/src/main/java/ch/elca/el4j/services/xmlmerge/tool/XmlMergeTool.java $
   *
   * @author Laurent Bovet (LBO)
   * @author Alex Mathey (AMA)
   */
  public class XmlMergeTool {
  	
  	/**
  	 * Hide default constructor.
  	 */
  	protected XmlMergeTool() { }
  	
  	/**
  	 * Starts the XmlMerge Command-line tool.
  	 * @param args The names of the files to merge
  	 * @throws Exception If an error occurs during the execution of the tool
  	 */
  	public static void main(String[] args) throws Exception {
  
  		if (args.length < 2) {
  			usage();
  		}
  
  		int argCursor = 0;
  
  		String configFilename = null;
  
  		if ("-config".equals(args[0])) {
  			if (args[1] != null) {
  				configFilename = args[1];
  			}
  
  			argCursor = 2;
  
  			if (args.length < 4) {
  				usage();
  			}
  		}
  
  		XmlMerge xmlMerge;
  
  		if (configFilename != null) {
  			Properties props = new Properties();
  
  			try {
  				props.load(new FileInputStream(configFilename));
  			} catch (FileNotFoundException ex) {
  				System.err.println("File not found: " + configFilename);
  				System.exit(1);
  			} catch (IOException ioe) {
  				System.err.println("Cannot read file: " + configFilename);
  				System.exit(1);
  			}
  
  			xmlMerge = new ConfigurableXmlMerge(new DefaultXmlMerge(),
  				new PropertyXPathConfigurer(props));
  		} else {
  			xmlMerge = new DefaultXmlMerge();
  		}
  
  		InputStream[] sources = new InputStream[args.length - argCursor];
  
  		for (int i = argCursor; i < args.length; i++) {
 
 			String filename = args[i];
 
 			try {
 				sources[i - argCursor] = new FileInputStream(filename);
 			} catch (FileNotFoundException ex) {
 				System.err.println("File not found: " + filename);
 				System.exit(1);
 			}
 		}
 
 		InputStream stream = xmlMerge.merge(sources);
 
 		byte[] buffer = new byte[2048];
 		int len;
 
 		try {
 			while ((len = stream.read(buffer)) != -1) {
 				System.out.write(buffer, 0, len);
 			}
 		} catch (IOException ioex) {
 			// Should not happen...
 			ioex.printStackTrace(System.err);
 			System.exit(1);
 		}
 	}
 
 	/**
 	 * Desribes the usage of this tool.
 	 */
 	public static void usage() {
 		System.err
 			.println("xmlmerge [-config <config-file>] file1 file2 [file3 ...]");
 		System.exit(1);
 	}
 }
 
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