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/**************************************************************************
 * copyright file="MimeContent.java" company="Microsoft"
 *     Copyright (c) Microsoft Corporation.  All rights reserved.
 * 
 * Defines the MimeContent.java.
 **************************************************************************/
package microsoft.exchange.webservices.data;

import javax.xml.stream.XMLStreamException;

/**
 *Represents the MIME content of an item.
 */
public final class MimeContent extends ComplexProperty {

	/** The character set. */
	private String characterSet;

	/** The content. */
	private byte[] content;

	/**
	 * Initializes a new instance of the class.
	 */
	public MimeContent() {
	}

	/**
	 * Initializes a new instance of the class.
	 * 
	 * @param characterSet
	 *            the character set
	 * @param content
	 *            the content
	 */
	public MimeContent(String characterSet, byte[] content) {
		this();
		this.characterSet = characterSet;
		this.content = content;
	}

	/**
	 * Reads attributes from XML.
	 * 
	 * @param reader
	 *            the reader
	 * @throws Exception
	 *             the exception
	 */
	@Override
	protected void readAttributesFromXml(EwsServiceXmlReader reader)
			throws Exception {
		this.characterSet = reader.readAttributeValue(String.class,
				XmlAttributeNames.CharacterSet);
	}

	/**
	 * Reads text value from XML.
	 * 
	 * @param reader
	 *            the reader
	 * @throws XMLStreamException
	 *             the xML stream exception
	 * @throws ServiceXmlDeserializationException
	 *             the service xml deserialization exception
	 */
	@Override
	protected void readTextValueFromXml(EwsServiceXmlReader reader)
			throws XMLStreamException, ServiceXmlDeserializationException {
		this.content = Base64EncoderStream.decode(reader.readValue());
	}

	/**
	 * Writes attributes to XML.
	 * 
	 * @param writer
	 *            the writer
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	@Override
	protected void writeAttributesToXml(EwsServiceXmlWriter writer)
			throws ServiceXmlSerializationException {
		writer.writeAttributeValue(XmlAttributeNames.CharacterSet,
				this.characterSet);
	}

	/**
	 * Writes elements to XML.
	 * 
	 * @param writer
	 *            the writer
	 * @throws XMLStreamException
	 *             the xML stream exception
	 */
	protected void writeElementsToXml(EwsServiceXmlWriter writer)
			throws XMLStreamException {
		if (this.content != null && this.content.length > 0) {
			writer.writeBase64ElementValue(this.content);
		}
	}

	/**
	 * Gets  the character set of the content.
	 * 
	 * @return the character set
	 */
	public String getCharacterSet() {
		return this.characterSet;
	}

	/**
	 * Sets the character set.
	 * 
	 * @param characterSet
	 *            the new character set
	 */
	public void setCharacterSet(String characterSet) {
		this.canSetFieldValue(this.characterSet, characterSet);
	}

	/**
	 * Gets  the character set of the content.
	 * 
	 * @return the content
	 */
	public byte[] getContent() {
		return this.content;
	}

	/**
	 * Sets the content.
	 * 
	 * @param content
	 *            the new content
	 */
	public void setContent(byte[] content) {
		this.canSetFieldValue(this.content, content);
	}

	/**
	 * Writes attributes to XML.
	 * 
	 * @return the string
	 */
	@Override
	public String toString() {
		if (this.getContent() == null) {
			return "";
		} else {
			try {
				
				// Try to convert to original MIME content using specified
				// charset. If this fails,
				// return the Base64 representation of the content.
				// Note: Encoding.GetString can throw DecoderFallbackException
				// which is a subclass
				// of ArgumentException.
				String charSet = (this.getCharacterSet() == null ||
						 this.getCharacterSet().isEmpty()) ? 
								 "UTF-8" : this.getCharacterSet();
				return new String(this.getContent(),charSet);
			} catch (Exception e) {
				return Base64EncoderStream.encode(this.getContent());
			}
		}
	}

}