org.opencms.mail.CmsInputStreamDataSource Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH & Co. KG, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.mail;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.activation.DataSource;
/**
*
* DataSource implementation that may be filled with content from an {@link java.io.InputStream}.
*
* It's intended use is for creation of mail attachments from strings without having to create RFS
* or VFS resources. Note that this data source will only support read operations and operations
* related to writing will throw an {@link java.lang.UnsupportedOperationException}.
*
*
* @since 6.1.7
*/
public class CmsInputStreamDataSource implements DataSource {
/** The content type to use for the data source. */
private String m_contentType;
/** The underlying input stream of this data source. */
private InputStream m_inputStream;
/** The name of this data source. */
private String m_name;
/**
* Constructor with mandatory input stream, content type and name.
*
* Note that the given input stream has to be resettable. During a mail creation and
* transmission cycle it is potentially read twice (commons-email-1.0.jar in combination with
* activation.jar) and the 2nd time the actual transport to the serial data to transmit is done.
* So a reset will be made here whenever the internal input stream is retrieved to avoid that
* the attachments remain empty.
*
* The contentType argument should always be a valid MIME type. It is suggested that it is
* "application/octet-stream" if the DataSource implementation can not determine the data type.
* For textual data it should be "text/<subtype>; charset=<encoding>" to give a hint
* about the ecoding. Note that some textual documents like xml have their own encoding
* directive contained and the charset given here (for the mail part header) should not be
* different from the contained one.
*
*
* @param in the underlying source of data.
*
* @param contentType the correct MIME type of the data along with the charset in the form of a
* string (see comment above).
*
* @param name the name that describes the data in the underyling input stream. E.g. the name of
* a file that the input stream reads from.
*
*/
public CmsInputStreamDataSource(InputStream in, String contentType, String name) {
m_inputStream = in;
m_contentType = contentType;
m_name = name;
}
/**
* @see javax.activation.DataSource#getContentType()
*/
public String getContentType() {
return m_contentType;
}
/**
* Retunrs the underlying input stream of this data source.
*
* @return the underlying input stream of this data source.
*
* @throws IOException if the constructor-given input stream is not "resettable" ({@link InputStream#reset()}).
*
* @see javax.activation.DataSource#getInputStream()
*
*/
public InputStream getInputStream() throws IOException {
m_inputStream.reset();
return m_inputStream;
}
/**
* @see javax.activation.DataSource#getName()
*/
public String getName() {
return m_name;
}
/**
* Don't use this method, VFS resources can't be written using this datasource class.
*
*
* This method will just return a new {@link ByteArrayOutputStream}.
*
*
* @see javax.activation.DataSource#getOutputStream()
*/
public OutputStream getOutputStream() {
// maybe throw an Exception here to avoid errors
return new ByteArrayOutputStream();
}
}