/*
    * ====================================================================
    * This software is subject to the terms of the Common Public License
    * Agreement, available at the following URL:
    *   http://www.opensource.org/licenses/cpl.html .
    * You must accept the terms of that agreement to use this software.
    * ====================================================================
    */
   package com.eyeq.pivot4j.pentaho.content;
  
  import java.lang.reflect.Field;
  import java.util.Map;
  
  import javax.annotation.PostConstruct;
  
  import org.pentaho.platform.engine.core.system.PentahoSystem;
  import org.pentaho.platform.plugin.services.importexport.Converter;
  import org.pentaho.platform.plugin.services.importexport.DefaultExportHandler;
  import org.pentaho.platform.plugin.services.importexport.StreamConverter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.eyeq.pivot4j.pentaho.repository.PentahoReportFile;
  
  /**
   * XXX Temporary workaround for file export problem. Nobody in right mind should
   * ever have to resort to such a horrible hack to make things work. We really
   * need more sane method for plugins to register converters.
   */
  public class ConverterRegistrationHelper {
  
  	@PostConstruct
  	protected void initialize() {
  		Logger log = LoggerFactory.getLogger(getClass());
  
  		if (log.isInfoEnabled()) {
  			log.info("Trying to register a content converter.");
  		}
  
  		try {
  			DefaultExportHandler handler = PentahoSystem
  					.get(DefaultExportHandler.class);
  
  			Field field = handler.getClass().getDeclaredField("converters");
  			field.setAccessible(true);
  
  			try {
  				@SuppressWarnings("unchecked")
  				Map<String, Converter> converters = (Map<String, Converter>) field
  						.get(handler);
  
  				Converter streamConverter = null;
  
  				for (Converter converter : converters.values()) {
  					if (converter instanceof StreamConverter) {
  						streamConverter = converter;
  					}
  				}
  
  				if (streamConverter != null) {
  					if (log.isInfoEnabled()) {
  						log.info(String
  								.format("Registering converter for extension '%s' : %s",
  										PentahoReportFile.DEFAULT_EXTENSION,
  										streamConverter));
  					}
  
  					converters.put(PentahoReportFile.DEFAULT_EXTENSION,
  							streamConverter);
  				}
  
  			} finally {
  				field.setAccessible(false);
  			}
  		} catch (Exception e) {
  			if (log.isWarnEnabled()) {
  				log.warn(String.format(
  						"Failed to register a converter for extension '%s' : "
  								+ e, PentahoReportFile.DEFAULT_EXTENSION), e);
  			}
  		}
  	}
  }