public Template rewrite()

in gateway-provider-rewrite/src/main/java/org/apache/knox/gateway/filter/rewrite/api/UrlRewriteProcessor.java [125:178]
54 lines of code
14 McCabe index (conditional complexity)

  public Template rewrite( Resolver resolver, Template inputUri, Direction direction, String ruleName ) {
    Template outputUri = inputUri;
    String serviceRole = null;
    if (resolver != null) {
      List<String> serviceRoles = resolver.resolve("service.role");
      if ( serviceRoles != null && !serviceRoles.isEmpty() ) {
        serviceRole = serviceRoles.get(0);
      }
    }
    UrlRewriteStepProcessorHolder stepHolder = null;
    String effectiveRuleName = null;
    if( ruleName == null || "*".equals( ruleName ) ) {
      ruleName = null; // Used for logging later.
      Matcher<UrlRewriteRuleProcessorHolder>.Match match = null;
      switch( direction ) {
        case IN:
          match = inbound.match( outputUri, serviceRole );
          break;
        case OUT:
          match = outbound.match( outputUri, serviceRole );
          break;
      }
      if( match != null ) {
        stepHolder = match.getValue();
        effectiveRuleName = match.getValue().getRuleName();
      }
    } else if( !ruleName.isEmpty() ) {
      stepHolder = rules.get( ruleName );
      effectiveRuleName = ruleName;
    }
    if( stepHolder != null ) {
      UrlRewriteContext context = new UrlRewriteContextImpl( environment, resolver, functions, direction, inputUri );
      try {
        UrlRewriteStepStatus stepStatus = stepHolder.process( context );
        if( UrlRewriteStepStatus.SUCCESS == stepStatus ) {
          outputUri = context.getCurrentUrl();
          if( ruleName == null ) {
            LOG.rewroteUrlViaImplicitRule( inputUri, direction, effectiveRuleName, outputUri );
          } else {
            LOG.rewroteUrlViaExplicitRule( inputUri, direction, effectiveRuleName, outputUri );
          }
        } else {
          LOG.failedToRewriteUrl( inputUri, direction, effectiveRuleName, stepStatus );
          outputUri = null;
        }
      } catch( Exception e ) {
        LOG.failedToRewriteUrlDueToException( inputUri, direction, effectiveRuleName, e );
        outputUri = null;
      }
    } else {
      LOG.noRuleMatchingUrl( inputUri, direction );
    }
    return outputUri;
  }