Message.java
/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.mail;
import jakarta.mail.search.SearchTerm;
import java.io.InvalidObjectException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.util.Date;
/**
* This class models an email message. This is an abstract class.
* Subclasses provide actual implementations. <p>
*
* Message implements the Part interface. Message contains a set of
* attributes and a "content". Messages within a folder also have a
* set of flags that describe its state within the folder.<p>
*
* Message defines some new attributes in addition to those defined
* in the <code>Part</code> interface. These attributes specify meta-data
* for the message - i.e., addressing and descriptive information about
* the message. <p>
*
* Message objects are obtained either from a Folder or by constructing
* a new Message object of the appropriate subclass. Messages that have
* been received are normally retrieved from a folder named "INBOX". <p>
*
* A Message object obtained from a folder is just a lightweight
* reference to the actual message. The Message is 'lazily' filled
* up (on demand) when each item is requested from the message. Note
* that certain folder implementations may return Message objects that
* are pre-filled with certain user-specified items.
*
* To send a message, an appropriate subclass of Message (e.g.,
* MimeMessage) is instantiated, the attributes and content are
* filled in, and the message is sent using the <code>Transport.send</code>
* method.
*
* @author John Mani
* @author Bill Shannon
* @author Max Spivak
* @see jakarta.mail.Part
*/
public abstract class Message implements Part {
/**
* The number of this message within its folder, or zero if
* the message was not retrieved from a folder.
*/
protected int msgnum = 0;
/**
* True if this message has been expunged.
*/
protected boolean expunged = false;
/**
* The containing folder, if this message is obtained from a folder
*/
protected Folder folder = null;
/**
* The Session object for this Message
*/
protected Session session = null;
/**
* No-arg version of the constructor.
*/
protected Message() {
}
/**
* Constructor that takes a Folder and a message number.
* Used by Folder implementations.
*
* @param folder containing folder
* @param msgnum this message's sequence number within this folder
*/
protected Message(Folder folder, int msgnum) {
this.folder = folder;
this.msgnum = msgnum;
session = folder.store.session;
}
/**
* Constructor that takes a Session. Used for client created
* Message objects.
*
* @param session A Session object
*/
protected Message(Session session) {
this.session = session;
}
/**
* Return the Session used when this message was created.
*
* @return the message's Session
* @since JavaMail 1.5
*/
public Session getSession() {
return session;
}
/**
* Returns the "From" attribute. The "From" attribute contains
* the identity of the person(s) who wished this message to
* be sent. <p>
*
* In certain implementations, this may be different
* from the entity that actually sent the message. <p>
*
* This method returns <code>null</code> if this attribute
* is not present in this message. Returns an empty array if
* this attribute is present, but contains no addresses.
*
* @return array of Address objects
* @throws MessagingException for failures
*/
public abstract Address[] getFrom() throws MessagingException;
/**
* Set the "From" attribute in this Message. The value of this
* attribute is obtained from the property "mail.user". If this
* property is absent, the system property "user.name" is used.
*
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void setFrom() throws MessagingException;
/**
* Set the "From" attribute in this Message.
*
* @param address the sender
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void setFrom(Address address)
throws MessagingException;
/**
* Add these addresses to the existing "From" attribute
*
* @param addresses the senders
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void addFrom(Address[] addresses)
throws MessagingException;
/**
* This inner class defines the types of recipients allowed by
* the Message class. The currently defined types are TO,
* CC and BCC.
*
* Note that this class only has a protected constructor, thereby
* restricting new Recipient types to either this class or subclasses.
* This effectively implements an enumeration of the allowed Recipient
* types.
*
* The following code sample shows how to use this class to obtain
* the "TO" recipients from a message.
* <blockquote><pre>
*
* Message msg = folder.getMessages(1);
* Address[] a = m.getRecipients(Message.RecipientType.TO);
*
* </pre></blockquote>
*
* @see jakarta.mail.Message#getRecipients
* @see jakarta.mail.Message#setRecipients
* @see jakarta.mail.Message#addRecipients
*/
public static class RecipientType implements Serializable {
/**
* The "To" (primary) recipients.
*/
public static final RecipientType TO = new RecipientType("To");
/**
* The "Cc" (carbon copy) recipients.
*/
public static final RecipientType CC = new RecipientType("Cc");
/**
* The "Bcc" (blind carbon copy) recipients.
*/
public static final RecipientType BCC = new RecipientType("Bcc");
/**
* The type of recipient, usually the name of a corresponding
* Internet standard header.
*
* @serial
*/
protected String type;
private static final long serialVersionUID = -7479791750606340008L;
/**
* Constructor for use by subclasses.
*
* @param type the recipient type
*/
protected RecipientType(String type) {
this.type = type;
}
/**
* When deserializing a RecipientType, we need to make sure to
* return only one of the known static final instances defined
* in this class. Subclasses must implement their own
* <code>readResolve</code> method that checks for their known
* instances before calling this super method.
*
* @return the RecipientType object instance
* @throws ObjectStreamException for object stream errors
*/
protected Object readResolve() throws ObjectStreamException {
if (type.equals("To"))
return TO;
else if (type.equals("Cc"))
return CC;
else if (type.equals("Bcc"))
return BCC;
else
throw new InvalidObjectException(
"Attempt to resolve unknown RecipientType: " + type);
}
@Override
public String toString() {
return type;
}
}
/**
* Get all the recipient addresses of the given type. <p>
*
* This method returns <code>null</code> if no recipients of
* the given type are present in this message. It may return an
* empty array if the header is present, but contains no addresses.
*
* @param type the recipient type
* @return array of Address objects
* @throws MessagingException for failures
* @see Message.RecipientType#TO
* @see Message.RecipientType#CC
* @see Message.RecipientType#BCC
*/
public abstract Address[] getRecipients(RecipientType type)
throws MessagingException;
/**
* Get all the recipient addresses for the message.
* The default implementation extracts the TO, CC, and BCC
* recipients using the <code>getRecipients</code> method. <p>
*
* This method returns <code>null</code> if none of the recipient
* headers are present in this message. It may Return an empty array
* if any recipient header is present, but contains no addresses.
*
* @return array of Address objects
* @throws MessagingException for failures
* @see Message.RecipientType#TO
* @see Message.RecipientType#CC
* @see Message.RecipientType#BCC
* @see #getRecipients
*/
public Address[] getAllRecipients() throws MessagingException {
Address[] to = getRecipients(RecipientType.TO);
Address[] cc = getRecipients(RecipientType.CC);
Address[] bcc = getRecipients(RecipientType.BCC);
if (cc == null && bcc == null)
return to; // a common case
int numRecip =
(to != null ? to.length : 0) +
(cc != null ? cc.length : 0) +
(bcc != null ? bcc.length : 0);
Address[] addresses = new Address[numRecip];
int pos = 0;
if (to != null) {
System.arraycopy(to, 0, addresses, pos, to.length);
pos += to.length;
}
if (cc != null) {
System.arraycopy(cc, 0, addresses, pos, cc.length);
pos += cc.length;
}
if (bcc != null) {
System.arraycopy(bcc, 0, addresses, pos, bcc.length);
// pos += bcc.length;
}
return addresses;
}
/**
* Set the recipient addresses. All addresses of the specified
* type are replaced by the addresses parameter.
*
* @param type the recipient type
* @param addresses the addresses
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void setRecipients(RecipientType type, Address[] addresses)
throws MessagingException;
/**
* Set the recipient address. All addresses of the specified
* type are replaced by the address parameter. <p>
*
* The default implementation uses the <code>setRecipients</code> method.
*
* @param type the recipient type
* @param address the address
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws MessagingException for other failures
*/
public void setRecipient(RecipientType type, Address address)
throws MessagingException {
if (address == null)
setRecipients(type, null);
else {
Address[] a = new Address[1];
a[0] = address;
setRecipients(type, a);
}
}
/**
* Add these recipient addresses to the existing ones of the given type.
*
* @param type the recipient type
* @param addresses the addresses
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void addRecipients(RecipientType type, Address[] addresses)
throws MessagingException;
/**
* Add this recipient address to the existing ones of the given type. <p>
*
* The default implementation uses the <code>addRecipients</code> method.
*
* @param type the recipient type
* @param address the address
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws MessagingException for other failures
*/
public void addRecipient(RecipientType type, Address address)
throws MessagingException {
Address[] a = new Address[1];
a[0] = address;
addRecipients(type, a);
}
/**
* Get the addresses to which replies should be directed.
* This will usually be the sender of the message, but
* some messages may direct replies to a different address. <p>
*
* The default implementation simply calls the <code>getFrom</code>
* method. <p>
*
* This method returns <code>null</code> if the corresponding
* header is not present. Returns an empty array if the header
* is present, but contains no addresses.
*
* @return addresses to which replies should be directed
* @throws MessagingException for failures
* @see #getFrom
*/
public Address[] getReplyTo() throws MessagingException {
return getFrom();
}
/**
* Set the addresses to which replies should be directed.
* (Normally only a single address will be specified.)
* Not all message types allow this to be specified separately
* from the sender of the message. <p>
*
* The default implementation provided here just throws the
* MethodNotSupportedException.
*
* @param addresses addresses to which replies should be directed
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MethodNotSupportedException if the underlying
* implementation does not support setting this
* attribute
* @throws MessagingException for other failures
*/
public void setReplyTo(Address[] addresses) throws MessagingException {
throw new MethodNotSupportedException("setReplyTo not supported");
}
/**
* Get the subject of this message.
*
* @return the subject
* @throws MessagingException for failures
*/
public abstract String getSubject() throws MessagingException;
/**
* Set the subject of this message.
*
* @param subject the subject
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void setSubject(String subject)
throws MessagingException;
/**
* Get the date this message was sent.
*
* @return the date this message was sent
* @throws MessagingException for failures
*/
public abstract Date getSentDate() throws MessagingException;
/**
* Set the sent date of this message.
*
* @param date the sent date of this message
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
*/
public abstract void setSentDate(Date date) throws MessagingException;
/**
* Get the date this message was received.
*
* @return the date this message was received
* @throws MessagingException for failures
*/
public abstract Date getReceivedDate() throws MessagingException;
/**
* Returns a <code>Flags</code> object containing the flags for
* this message. <p>
*
* Modifying any of the flags in this returned Flags object will
* not affect the flags of this message. Use <code>setFlags()</code>
* to do that.
*
* @return Flags object containing the flags for this message
* @throws MessagingException for failures
* @see jakarta.mail.Flags
* @see #setFlags
*/
public abstract Flags getFlags() throws MessagingException;
/**
* Check whether the flag specified in the <code>flag</code>
* argument is set in this message. <p>
*
* The default implementation uses <code>getFlags</code>.
*
* @param flag the flag
* @return value of the specified flag for this message
* @throws MessagingException for failures
* @see jakarta.mail.Flags.Flag#ANSWERED
* @see jakarta.mail.Flags.Flag#DELETED
* @see jakarta.mail.Flags.Flag#DRAFT
* @see jakarta.mail.Flags.Flag#FLAGGED
* @see jakarta.mail.Flags.Flag#RECENT
* @see jakarta.mail.Flags.Flag#SEEN
* @see jakarta.mail.Flags.Flag
*/
public boolean isSet(Flags.Flag flag) throws MessagingException {
return getFlags().contains(flag);
}
/**
* Set the specified flags on this message to the specified value.
* Note that any flags in this message that are not specified in
* the given <code>Flags</code> object are unaffected. <p>
*
* This will result in a <code>MessageChangedEvent</code> being
* delivered to any MessageChangedListener registered on this
* Message's containing folder.
*
* @param flag Flags object containing the flags to be set
* @param set the value to be set
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values.
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
* @see jakarta.mail.event.MessageChangedEvent
*/
public abstract void setFlags(Flags flag, boolean set)
throws MessagingException;
/**
* Set the specified flag on this message to the specified value.
*
* This will result in a <code>MessageChangedEvent</code> being
* delivered to any MessageChangedListener registered on this
* Message's containing folder. <p>
*
* The default implementation uses the <code>setFlags</code> method.
*
* @param flag Flags.Flag object containing the flag to be set
* @param set the value to be set
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values.
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws MessagingException for other failures
* @see jakarta.mail.event.MessageChangedEvent
*/
public void setFlag(Flags.Flag flag, boolean set)
throws MessagingException {
Flags f = new Flags(flag);
setFlags(f, set);
}
/**
* Get the Message number for this Message.
* A Message object's message number is the relative
* position of this Message in its Folder. Note that the message
* number for a particular Message can change during a session
* if other messages in the Folder are deleted and expunged. <p>
*
* Valid message numbers start at 1. Messages that do not belong
* to any folder (like newly composed or derived messages) have 0
* as their message number.
*
* @return the message number
*/
public int getMessageNumber() {
return msgnum;
}
/**
* Set the Message number for this Message. This method is
* invoked only by the implementation classes.
*
* @param msgnum the message number
*/
protected void setMessageNumber(int msgnum) {
this.msgnum = msgnum;
}
/**
* Get the folder from which this message was obtained. If
* this is a new message or nested message, this method returns
* null.
*
* @return the containing folder
*/
public Folder getFolder() {
return folder;
}
/**
* Checks whether this message is expunged. All other methods except
* <code>getMessageNumber()</code> are invalid on an expunged
* Message object. <p>
*
* Messages that are expunged due to an explict <code>expunge()</code>
* request on the containing Folder are removed from the Folder
* immediately. Messages that are externally expunged by another source
* are marked "expunged" and return true for the isExpunged() method,
* but they are not removed from the Folder until an explicit
* <code>expunge()</code> is done on the Folder. <p>
*
* See the description of <code>expunge()</code> for more details on
* expunge handling.
*
* @return true if the message is expunged
* @see Folder#expunge
*/
public boolean isExpunged() {
return expunged;
}
/**
* Sets the expunged flag for this Message. This method is to
* be used only by the implementation classes.
*
* @param expunged the expunged flag
*/
protected void setExpunged(boolean expunged) {
this.expunged = expunged;
}
/**
* Get a new Message suitable for a reply to this message.
* The new Message will have its attributes and headers
* set up appropriately. Note that this new message object
* will be empty, that is, it will <strong>not</strong> have a "content".
* These will have to be suitably filled in by the client. <p>
*
* If <code>replyToAll</code> is set, the new Message will be addressed
* to all recipients of this message. Otherwise, the reply will be
* addressed to only the sender of this message (using the value
* of the <code>getReplyTo</code> method). <p>
*
* The "Subject" field is filled in with the original subject
* prefixed with "Re:" (unless it already starts with "Re:"). <p>
*
* The reply message will use the same session as this message.
*
* @param replyToAll reply should be sent to all recipients
* of this message
* @return the reply Message
* @throws MessagingException for failures
*/
public abstract Message reply(boolean replyToAll) throws MessagingException;
/**
* Save any changes made to this message into the message-store
* when the containing folder is closed, if the message is contained
* in a folder. (Some implementations may save the changes
* immediately.) Update any header fields to be consistent with the
* changed message contents. If any part of a message's headers or
* contents are changed, saveChanges must be called to ensure that
* those changes are permanent. If saveChanges is not called, any
* such modifications may or may not be saved, depending on the
* message store and folder implementation. <p>
*
* Messages obtained from folders opened READ_ONLY should not be
* modified and saveChanges should not be called on such messages.
*
* @throws IllegalStateException if this message is
* obtained from a READ_ONLY folder.
* @throws IllegalWriteException if the underlying
* implementation does not support modification
* of existing values.
* @throws MessagingException for other failures
*/
public abstract void saveChanges() throws MessagingException;
/**
* Apply the specified Search criterion to this message.
*
* @param term the Search criterion
* @return true if the Message matches this search
* criterion, false otherwise.
* @throws MessagingException for failures
* @see jakarta.mail.search.SearchTerm
*/
public boolean match(SearchTerm term) throws MessagingException {
return term.match(this);
}
}