/*
    * 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.syncope.client.ui.commons;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Optional;
  import javax.ws.rs.core.MediaType;
  import org.apache.syncope.client.ui.commons.rest.ResponseHolder;
  import org.apache.wicket.util.lang.Bytes;
  import org.apache.wicket.util.resource.AbstractResourceStream;
  import org.apache.wicket.util.resource.IFixedLocationResourceStream;
  import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
  
  public class HttpResourceStream extends AbstractResourceStream implements IFixedLocationResourceStream {
  
      private static final long serialVersionUID = 5811207817876330189L;
  
      private final ResponseHolder responseHolder;
  
      public HttpResourceStream(final ResponseHolder responseHolder) {
          super();
          this.responseHolder = responseHolder;
      }
  
      @Override
      public InputStream getInputStream()
              throws ResourceStreamNotFoundException {
  
          return responseHolder.getInputStream() == null
                  ? new ByteArrayInputStream(new byte[0])
                  : responseHolder.getInputStream();
      }
  
      @Override
      public Bytes length() {
          return responseHolder.getInputStream() == null
                  ? Bytes.bytes(0)
                  : null;
      }
  
      @Override
      public void close() throws IOException {
          // No need for explict closing
      }
  
      @Override
      public String locationAsString() {
          return responseHolder.getLocation();
      }
  
      @Override
      public String getContentType() {
          return Optional.ofNullable(responseHolder.getContentType()).orElse(MediaType.APPLICATION_OCTET_STREAM);
      }
  
      public String getFilename() {
          return responseHolder.getFilename();
      }
  }