/*
    * Copyright 2009 the original author or authors.
    * 
    * Licensed 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.openehealth.ipf.commons.ihe.ws.cxf;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Map;
  
  import javax.activation.DataHandler;
  
  import org.apache.cxf.attachment.AttachmentImpl;
  import org.apache.cxf.binding.soap.SoapMessage;
  import org.apache.cxf.binding.soap.interceptor.AbstractSoapInterceptor;
  import org.apache.cxf.interceptor.AttachmentOutInterceptor;
  import org.apache.cxf.interceptor.Fault;
  import org.apache.cxf.jaxws.interceptors.HolderOutInterceptor;
  import org.apache.cxf.jaxws.interceptors.WrapperClassOutInterceptor;
  import org.apache.cxf.message.Attachment;
  import org.apache.cxf.phase.Phase;
  
  /**
   * Interceptor to add provided outgoing attachments for SwA on the client side.
   * @author Jens Riemschneider
   */
  public class ProvidedAttachmentOutInterceptor extends AbstractSoapInterceptor {
      /**
       * Context property that contains the provided attachments that need to be
       * added to the message.
       */
      public static final String ATTACHMENTS = 
          ProvidedAttachmentOutInterceptor.class.getName() + ".provided_attachments";
  
      /**
       * Constructs the interceptor.
       */
      public ProvidedAttachmentOutInterceptor() {
          super(Phase.PRE_LOGICAL);
          addAfter(HolderOutInterceptor.class.getName());
          addBefore(WrapperClassOutInterceptor.class.getName());
      }
  
      @Override
      public void handleMessage(SoapMessage message) throws Fault {
          Map<?, ?> providedAttachments = (Map<?, ?>) message.getContextualProperty(ATTACHMENTS);
          if (providedAttachments.isEmpty()) {
              return;
          }
  
          Collection<Attachment> attachments = message.getAttachments();
          if (attachments == null) {
              attachments = new ArrayList<>();
              message.setAttachments(attachments);
          }
          
          for (Map.Entry<?, ?> entry : providedAttachments.entrySet()) {
              attachments.add(new AttachmentImpl((String)entry.getKey(), (DataHandler)entry.getValue()));
          }
  
          message.put(AttachmentOutInterceptor.WRITE_ATTACHMENTS, Boolean.TRUE);
      }
  }