content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.camel.component.dfdl;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.channels.Channels;
  
  import org.w3c.dom.Document;
  
  import org.apache.camel.Category;
  import org.apache.camel.Exchange;
  import org.apache.camel.spi.Metadata;
  import org.apache.camel.spi.Resource;
  import org.apache.camel.spi.UriEndpoint;
  import org.apache.camel.spi.UriParam;
  import org.apache.camel.spi.UriPath;
  import org.apache.camel.support.ProcessorEndpoint;
  import org.apache.camel.support.ResourceHelper;
  import org.apache.daffodil.japi.Daffodil;
  import org.apache.daffodil.japi.DataProcessor;
  import org.apache.daffodil.japi.Diagnostic;
  import org.apache.daffodil.japi.ParseResult;
  import org.apache.daffodil.japi.ProcessorFactory;
  import org.apache.daffodil.japi.UnparseResult;
  import org.apache.daffodil.japi.infoset.W3CDOMInfosetInputter;
  import org.apache.daffodil.japi.infoset.W3CDOMInfosetOutputter;
  import org.apache.daffodil.japi.io.InputSourceDataInputStream;
  
  /**
   * Transforms fixed format data such as EDI message from/to XML using a Data Format Description Language (DFDL).
   */
  @UriEndpoint(firstVersion = "4.11.0", scheme = "dfdl", title = "DFDL", syntax = "dfdl:schemaUri", producerOnly = true,
               category = { Category.TRANSFORMATION })
  public class DfdlEndpoint extends ProcessorEndpoint {
  
      @UriPath
      @Metadata(required = true, description = "The path to the DFDL schema file.")
      private String schemaUri;
  
      @UriParam
      @Metadata(defaultValue = "PARSE", description = "Transform direction. Either PARSE or UNPARSE")
      private ParseDirection parseDirection;
  
      @UriParam(description = "The root element name of the schema to use. If not specified, the first root element in the schema will be used.",
                label = "advanced", defaultValue = "")
      private String rootElement = "";
  
      @UriParam(description = "The root namespace of the schema to use.", label = "advanced", defaultValue = "")
      private String rootNamespace = "";
  
      private DataProcessor daffodilProcessor;
  
      public DfdlEndpoint(String uri, DfdlComponent component, String schemaFile) {
          super(uri, component);
          this.schemaUri = schemaFile;
      }
  
      @Override
      public void doInit() throws Exception {
          super.doInit();
          ProcessorFactory processorFactory;
          Resource schemaResource = ResourceHelper.resolveMandatoryResource(getCamelContext(), getSchemaUri());
          if (getRootElement() != null && !getRootElement().isEmpty() &&
                  getRootNamespace() != null && !getRootNamespace().isEmpty()) {
              processorFactory
                      = Daffodil.compiler().compileSource(schemaResource.getURI(), getRootElement(), getRootNamespace());
          } else {
              processorFactory = Daffodil.compiler().compileSource(schemaResource.getURI());
          }
          if (processorFactory.isError()) {
              StringBuilder buf = new StringBuilder("Failed to initialize dfdl endpoint: [");
              for (Diagnostic d : processorFactory.getDiagnostics()) {
                  buf.append(d.getMessage()).append("; ");
              }
              buf.append("]");
              throw new IOException(buf.toString());
          }
          this.daffodilProcessor = processorFactory.onPath("/");
      }
  
      @Override
      protected void onExchange(Exchange exchange) throws Exception {
          if (getParseDirection() == ParseDirection.UNPARSE) {
              Document xmlDocument = exchange.getIn().getBody(Document.class);
              W3CDOMInfosetInputter inputter = new W3CDOMInfosetInputter(xmlDocument);
              ByteArrayOutputStream bos = new ByteArrayOutputStream();
              UnparseResult result = this.daffodilProcessor.unparse(inputter, Channels.newChannel(bos));
              if (result.isError()) {
                  exchange.setException(new DfdlUnparseException(result));
                  return;
              }
              exchange.getMessage().setBody(bos);
          } else {
              byte[] binary = exchange.getIn().getBody(byte[].class);
              var inputStream = new InputSourceDataInputStream(binary);
              var outputter = new W3CDOMInfosetOutputter();
              ParseResult result = this.daffodilProcessor.parse(inputStream, outputter);
              if (result.isError()) {
                  exchange.setException(new DfdlParseException(result));
                  return;
              }
              exchange.getMessage().setBody(outputter.getResult());
          }
      }
  
      public ParseDirection getParseDirection() {
          return parseDirection;
      }
  
      public void setParseDirection(ParseDirection direction) {
          this.parseDirection = direction;
      }
  
      public String getSchemaUri() {
          return schemaUri;
      }
  
      public void setSchemaUri(String schemaUri) {
          this.schemaUri = schemaUri;
      }
  
      public String getRootElement() {
          return rootElement;
      }
  
      public void setRootElement(String rootElement) {
          this.rootElement = rootElement;
      }
  
      public String getRootNamespace() {
          return rootNamespace;
      }
  
      public void setRootNamespace(String rootNamespace) {
          this.rootNamespace = rootNamespace;
      }
  }
  