Package com.google.code.com.sun.mail.handlers

Source Code of com.google.code.com.sun.mail.handlers.text_xml

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* and Distribution License("CDDL") (collectively, the "License").  You
* may not use this file except in compliance with the License.  You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* file and include the License file at packager/legal/LICENSE.txt.
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* Modifications:
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package com.google.code.com.sun.mail.handlers;

import java.awt.datatransfer.DataFlavor;
import java.io.IOException;
import java.io.OutputStream;

import com.google.code.javax.activation.ActivationDataFlavor;
import com.google.code.javax.activation.DataContentHandler;
import com.google.code.javax.activation.DataSource;
import com.google.code.javax.mail.internet.ContentType;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

/**
* DataContentHandler for text/xml.
*
* @author Anil Vijendran
* @author Bill Shannon
*/
public class text_xml extends text_plain {

    private final DataFlavor[] flavors;

    public text_xml() {
  flavors = new DataFlavor[] {
      new ActivationDataFlavor(String.class, "text/xml", "XML String"),
      new ActivationDataFlavor(String.class, "application/xml",
          "XML String"),
      new ActivationDataFlavor(StreamSource.class, "text/xml", "XML"),
      new ActivationDataFlavor(StreamSource.class, "application/xml",
          "XML")
  };
    }

    /**
     * Return the DataFlavors for this <code>DataContentHandler</code>.
     *
     * @return the DataFlavors
     */
    public DataFlavor[] getTransferDataFlavors() { // throws Exception;
  return flavors;
    }

    /**
     * Return the Transfer Data of type DataFlavor from InputStream.
     *
     * @param df the DataFlavor
     * @param ds the InputStream corresponding to the data
     * @return the constructed Object
     */
    public Object getTransferData(DataFlavor df, DataSource ds)
        throws IOException {

  for (int i = 0; i < flavors.length; i++) {
      DataFlavor aFlavor = flavors[i];
      if (aFlavor.equals(df)) {
    if (aFlavor.getRepresentationClass() == String.class)
        return super.getContent(ds);
    else if (aFlavor.getRepresentationClass() == StreamSource.class)
        return new StreamSource(ds.getInputStream());
    else
        return null;        // XXX - should never happen
      }
  }
  return null;
    }

    /**
     */
    public void writeTo(Object obj, String mimeType, OutputStream os)
            throws IOException {
  if (!isXmlType(mimeType))
      throw new IOException(
    "Invalid content type \"" + mimeType + "\" for text/xml DCH");
  if (obj instanceof String) {
      super.writeTo(obj, mimeType, os);
      return;
  }
  if (!(obj instanceof DataSource || obj instanceof Source)) {
       throw new IOException("Invalid Object type = "+obj.getClass()+
    ". XmlDCH can only convert DataSource or Source to XML.");
  }

  try {
      Transformer transformer =
    TransformerFactory.newInstance().newTransformer();
      StreamResult result = new StreamResult(os);
      if (obj instanceof DataSource) {
    // Streaming transform applies only to
    // javax.xml.transform.StreamSource
    transformer.transform(
        new StreamSource(((DataSource)obj).getInputStream()),
        result);
      } else {
    transformer.transform((Source)obj, result);
      }
  } catch (Exception ex) {
      throw new IOException(
    "Unable to run the JAXP transformer on a stream "
        + ex.getMessage());
  }
    }

    private boolean isXmlType(String type) {
  try {
      ContentType ct = new ContentType(type);
      return ct.getSubType().equals("xml") &&
        (ct.getPrimaryType().equals("text") ||
        ct.getPrimaryType().equals("application"));
  } catch (Exception ex) {
      return false;
  }
    }
}
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