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/*
* @(#)Part.java 1.21 07/05/04
*/
package javax.mail;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import javax.activation.DataHandler;
/**
* The <code>Part</code> interface is the common base interface for Messages and
* BodyParts.
* <p>
*
* Part consists of a set of attributes and a "Content".
* <p>
*
* <strong> Attributes: </strong>
* <p>
*
* The JavaMail API defines a set of standard Part attributes that are
* considered to be common to most existing Mail systems. These attributes have
* their own settor and gettor methods. Mail systems may support other Part
* attributes as well, these are represented as name-value pairs where both the
* name and value are Strings.
* <p>
*
* <strong> Content: </strong>
* <p>
*
* The <strong>data type</strong> of the "content" is returned by the
* <code>getContentType()</code> method. The MIME typing system is used to name
* data types.
* <p>
*
* The "content" of a Part is available in various formats:
* <ul>
* <li>As a DataHandler - using the <code>getDataHandler()</code> method. The
* "content" of a Part is also available through a
* <code>javax.activation.DataHandler</code> object. The DataHandler object
* allows clients to discover the operations available on the content, and to
* instantiate the appropriate component to perform those operations.
*
* <li>As an input stream - using the <code>getInputStream()</code> method. Any
* mail-specific encodings are decoded before this stream is returned.
*
* <li>As a Java object - using the <code>getContent()</code> method. This
* method returns the "content" as a Java object. The returned object is of
* course dependent on the content itself. In particular, a "multipart" Part's
* content is always a Multipart or subclass thereof. That is,
* <code>getContent()</code> on a "multipart" type Part will always return a
* Multipart (or subclass) object.
* </ul>
*
* Part provides the <code>writeTo()</code> method that streams out its
* bytestream in mail-safe form suitable for transmission. This bytestream is
* typically an aggregation of the Part attributes and its content's bytestream.
* <p>
*
* Message and BodyPart implement the Part interface. Note that in MIME
* parlance, Part models an Entity (RFC 2045, Section 2.4).
*
* @author John Mani
*/
public interface Part {
/**
* Return the size of the content of this part in bytes. Return -1 if the
* size cannot be determined.
* <p>
*
* Note that the size may not be an exact measure of the content size and
* may or may not account for any transfer encoding of the content. The size
* is appropriate for display in a user interface to give the user a rough
* idea of the size of this part.
*
* @return size of content in bytes
* @exception MessagingException
*/
public int getSize() throws MessagingException;
/**
* Return the number of lines in the content of this part. Return -1 if the
* number cannot be determined.
*
* Note that this number may not be an exact measure of the content length
* and may or may not account for any transfer encoding of the content.
*
* @return number of lines in the content.
* @exception MessagingException
*/
public int getLineCount() throws MessagingException;
/**
* Returns the Content-Type of the content of this part. Returns null if the
* Content-Type could not be determined.
* <p>
*
* The MIME typing system is used to name Content-types.
*
* @return The ContentType of this part
* @exception MessagingException
* @see javax.activation.DataHandler
*/
public String getContentType() throws MessagingException;
/**
* Is this Part of the specified MIME type? This method compares
* <strong>only the <code>primaryType</code> and <code>subType</code>
* </strong>. The parameters of the content types are ignored.
* <p>
*
* For example, this method will return <code>true</code> when comparing a
* Part of content type <strong>"text/plain"</strong> with
* <strong>"text/plain; charset=foobar"</strong>.
* <p>
*
* If the <code>subType</code> of <code>mimeType</code> is the special
* character '*', then the subtype is ignored during the comparison.
*/
public boolean isMimeType(String mimeType) throws MessagingException;
/**
* This part should be presented as an attachment.
*
* @see #getDisposition
* @see #setDisposition
*/
public static final String ATTACHMENT = "attachment";
/**
* This part should be presented inline.
*
* @see #getDisposition
* @see #setDisposition
*/
public static final String INLINE = "inline";
/**
* Return the disposition of this part. The disposition describes how the
* part should be presented to the user. (See RFC 2183.) The return value
* should be considered without regard to case. For example:
* <p>
* <blockquote>
*
* <pre>
* String disp = part.getDisposition();
* if (disp == null || disp.equalsIgnoreCase(Part.ATTACHMENT))
* // treat as attachment if not first part
* </pre>
*
* </blockquote>
*
* @return disposition of this part, or null if unknown
* @exception MessagingException
* @see #ATTACHMENT
* @see #INLINE
* @see #getFileName
*/
public String getDisposition() throws MessagingException;
/**
* Set the disposition of this part.
*
* @param disposition
* disposition of this part
* @exception MessagingException
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of this header
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
* @see #ATTACHMENT
* @see #INLINE
* @see #setFileName
*/
public void setDisposition(String disposition) throws MessagingException;
/**
* Return a description String for this part. This typically associates some
* descriptive information with this part. Returns null if none is
* available.
*
* @return description of this part
* @exception MessagingException
*/
public String getDescription() throws MessagingException;
/**
* Set a description String for this part. This typically associates some
* descriptive information with this part.
*
* @param description
* description of this part
* @exception MessagingException
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of this header
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setDescription(String description) throws MessagingException;
/**
* Get the filename associated with this part, if possible. Useful if this
* part represents an "attachment" that was loaded from a file. The filename
* will usually be a simple name, not including directory components.
*
* @return Filename to associate with this part
*/
public String getFileName() throws MessagingException;
/**
* Set the filename associated with this part, if possible. Useful if this
* part represents an "attachment" that was loaded from a file. The filename
* will usually be a simple name, not including directory components.
*
* @param filename
* Filename to associate with this part
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of this header
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setFileName(String filename) throws MessagingException;
/**
* Return an input stream for this part's "content". Any mail-specific
* transfer encodings will be decoded before the input stream is provided.
* <p>
*
* This is typically a convenience method that just invokes the
* DataHandler's <code>getInputStream()</code> method.
*
* @return an InputStream
* @exception IOException
* this is typically thrown by the DataHandler. Refer to the
* documentation for javax.activation.DataHandler for more
* details.
* @exception MessagingException
* @see #getDataHandler
* @see javax.activation.DataHandler#getInputStream
*/
public InputStream getInputStream() throws IOException, MessagingException;
/**
* Return a DataHandler for the content within this part. The DataHandler
* allows clients to operate on as well as retrieve the content.
*
* @return DataHandler for the content
* @exception MessagingException
*/
public DataHandler getDataHandler() throws MessagingException;
/**
* Return the content as a Java object. The type of the returned object is
* of course dependent on the content itself. For example, the object
* returned for "text/plain" content is usually a String object. The object
* returned for a "multipart" content is always a Multipart subclass. For
* content-types that are unknown to the DataHandler system, an input stream
* is returned as the content
* <p>
*
* This is a convenience method that just invokes the DataHandler's
* getContent() method
*
* @return Object
* @exception MessagingException
* @exception IOException
* this is typically thrown by the DataHandler. Refer to the
* documentation for javax.activation.DataHandler for more
* details.
*
* @see javax.activation.DataHandler#getContent
*/
public Object getContent() throws IOException, MessagingException;
/**
* This method provides the mechanism to set this part's content. The
* DataHandler wraps around the actual content.
*
* @param dh
* The DataHandler for the content.
* @exception MessagingException
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setDataHandler(DataHandler dh) throws MessagingException;
/**
* A convenience method for setting this part's content. The part internally
* wraps the content in a DataHandler.
* <p>
*
* Note that a DataContentHandler class for the specified type should be
* available to the JavaMail implementation for this to work right. i.e., to
* do <code>setContent(foobar, "application/x-foobar")</code>, a
* DataContentHandler for "application/x-foobar" should be installed. Refer
* to the Java Activation Framework for more information.
*
* @param obj
* A java object.
* @param type
* MIME type of this object.
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setContent(Object obj, String type) throws MessagingException;
/**
* A convenience method that sets the given String as this part's content
* with a MIME type of "text/plain".
*
* @param text
* The text that is the Message's content.
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setText(String text) throws MessagingException;
/**
* This method sets the given Multipart object as this message's content.
*
* @param mp
* The multipart object that is the Message's content
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setContent(Multipart mp) throws MessagingException;
/**
* Output a bytestream for this Part. This bytestream is typically an
* aggregration of the Part attributes and an appropriately encoded
* bytestream from its 'content'.
* <p>
*
* Classes that implement the Part interface decide on the appropriate
* encoding algorithm to be used.
* <p>
*
* The bytestream is typically used for sending.
*
* @exception IOException
* if an error occurs writing to the stream or if an error is
* generated by the javax.activation layer.
* @exception MessagingException
* if an error occurs fetching the data to be written
*
* @see javax.activation.DataHandler#writeTo
*/
public void writeTo(OutputStream os) throws IOException, MessagingException;
/**
* Get all the headers for this header name. Returns <code>null</code> if no
* headers for this header name are available.
*
* @param header_name
* the name of this header
* @return the value fields for all headers with this name
* @exception MessagingException
*/
public String[] getHeader(String header_name) throws MessagingException;
/**
* Set the value for this header_name. Replaces all existing header values
* with this new value.
*
* @param header_name
* the name of this header
* @param header_value
* the value for this header
* @exception MessagingException
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void setHeader(String header_name, String header_value)
throws MessagingException;
/**
* Add this value to the existing values for this header_name.
*
* @param header_name
* the name of this header
* @param header_value
* the value for this header
* @exception MessagingException
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void addHeader(String header_name, String header_value)
throws MessagingException;
/**
* Remove all headers with this name.
*
* @param header_name
* the name of this header
* @exception MessagingException
* @exception IllegalWriteException
* if the underlying implementation does not support
* modification of existing values
* @exception IllegalStateException
* if this Part is obtained from a READ_ONLY folder
*/
public void removeHeader(String header_name) throws MessagingException;
/**
* Return all the headers from this part as an Enumeration of Header
* objects.
*
* @return enumeration of Header objects
* @exception MessagingException
*/
public Enumeration getAllHeaders() throws MessagingException;
/**
* Return matching headers from this part as an Enumeration of Header
* objects.
*
* @return enumeration of Header objects
* @exception MessagingException
*/
public Enumeration getMatchingHeaders(String[] header_names)
throws MessagingException;
/**
* Return non-matching headers from this envelope as an Enumeration of
* Header objects.
*
* @return enumeration of Header objects
* @exception MessagingException
*/
public Enumeration getNonMatchingHeaders(String[] header_names)
throws MessagingException;
}
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