/*
    * Copyright 2005-2008 The Kuali Foundation
    * 
    * 
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
   * 
   * 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.kuali.rice.kew.util;
  
  import java.io.BufferedOutputStream;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.UnsupportedEncodingException;
  
  import javax.activation.DataSource;
  
  import org.kuali.rice.kew.api.WorkflowRuntimeException;
  
  
  /**
   * A simple DataSource for demonstration purposes. This class implements a
   * DataSource from: an InputStream a byte array a String.
   */
  public class ByteArrayDataSource implements DataSource {
  
  	private byte[] data; // data
      private String type; // content-type
  
      /* Create a DataSource from an input stream */
      public ByteArrayDataSource(InputStream is, String type) {
          this.type = type;
          try {
              ByteArrayOutputStream baos = new ByteArrayOutputStream();
              OutputStream os = new BufferedOutputStream(baos);
              int byteData;
              while ((byteData = is.read()) != -1) {
                  os.write(byteData);
              }
              os.flush();
              data = baos.toByteArray();
          } catch (IOException ioex) {
          	throw new WorkflowRuntimeException(ioex);
          }
      }
  
      /* Create a DataSource from a byte array */
      public ByteArrayDataSource(byte[] data, String type) {
          this.data = data;
          this.type = type;
      }
  
      /* Create a DataSource from a String */
      public ByteArrayDataSource(String data, String type) {
          try {
              // Assumption that the string contains only ASCII
              // characters! Otherwise just pass a charset into this
              // constructor and use it in getBytes()
              this.data = data.getBytes("iso-8859-1");
          } catch (UnsupportedEncodingException uex) {}
          this.type = type;
      }
  
      /**
       * Return an InputStream for the data. Note - a new stream must be returned
       * each time.
       */
      public InputStream getInputStream() throws IOException {
          if (data == null)
              throw new IOException("no data");
          return new ByteArrayInputStream(data);
      }
  
      public OutputStream getOutputStream() throws IOException {
          throw new IOException("cannot do this");
      }
  
      public String getContentType() {
          return type;
      }
  
      public String getName() {
          return "dummy";
      }
  }