Java Code Examples for org.pentaho.reporting.libraries.resourceloader.ResourceManager#loadRawData()

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Example 1
Source File: ZipResourceBundleLoader.java    From pentaho-reporting with GNU Lesser General Public License v2.1 5 votes vote down vote up 
/**
 * Tries to load the bundle. If the key does not point to a usable resource-bundle, this method returns null. The
 * Exception is only thrown if the bundle is not readable because of IO-Errors.
 * <p/>
 * A resource-bundle loader should only load the bundle for the key itself, never for any of the derived subkeys. It
 * is the ResourceManager's responsibility to search the key's hierachy for the correct key.
 *
 * @param key the resource key pointing to the bundle.
 * @return the loaded bundle or null, if the resource was not understood.
 * @throws ResourceLoadingException if something goes wrong.
 */
public ResourceBundleData loadBundle( final ResourceManager resourceManager,
                                      final ResourceKey key ) throws ResourceLoadingException {
  if ( resourceManager == null ) {
    throw new NullPointerException();
  }
  if ( key == null ) {
    throw new NullPointerException();
  }

  try {
    final ResourceData rawData = resourceManager.loadRawData( key );
    // A zip bundle can be recognized by using simple finger-printing
    final byte[] buffer = new byte[ 2 ];
    rawData.getResource( resourceManager, buffer, 0, 2 );
    if ( buffer[ 0 ] != 'P' || buffer[ 1 ] != 'K' ) {
      return null;
    }

    final InputStream stream = rawData.getResourceAsStream( resourceManager );
    try {
      final ZipReadRepository zipReadRepository = new ZipReadRepository( stream );
      final String bundleType = BundleUtilities.getBundleType( zipReadRepository );
      final String bundleMapping = BundleUtilities.getBundleMapping( bundleType );

      final HashMap<FactoryParameterKey, Object> map = new HashMap<FactoryParameterKey, Object>();
      map.put( new FactoryParameterKey( "repository" ), zipReadRepository );
      map.put( new FactoryParameterKey( "repository-loader" ), this );

      final ResourceKey mainKey = new ResourceKey( key, ZipResourceBundleLoader.class.getName(), bundleMapping, map );
      return new RepositoryResourceBundleData( key, zipReadRepository, mainKey, false );
    } finally {
      stream.close();
    }
  } catch ( UnrecognizedLoaderException e ) {
    return null;
  } catch ( IOException ioe ) {
    throw new ResourceLoadingException( "IOError during load", ioe );
  }
}