FetchProfile (JavaMail API documentation)
Date: 2019-08-31

javax.mail

## Class FetchProfile

- java.lang.Object
- - javax.mail.FetchProfile

-     public class FetchProfile
      extends java.lang.Object

  Clients use a FetchProfile to list the Message attributes that it wishes to prefetch from the server for a range of messages.

  Messages obtained from a Folder are light-weight objects that typically start off as empty references to the actual messages. Such a Message object is filled in "on-demand" when the appropriate get*() methods are invoked on that particular Message. Certain server-based message access protocols (Ex: IMAP) allow batch fetching of message attributes for a range of messages in a single request. Clients that want to use message attributes for a range of Messages (Example: to display the top-level headers in a headerlist) might want to use the optimization provided by such servers. The `FetchProfile` allows the client to indicate this desire to the server.

  Note that implementations are not obligated to support FetchProfiles, since there might be cases where the backend service does not allow easy, efficient fetching of such profiles.

  Sample code that illustrates the use of a FetchProfile is given below:

  >       Message[] msgs = folder.getMessages();

  >       FetchProfile fp = new FetchProfile();
  >       fp.add(FetchProfile.Item.ENVELOPE);
  >       fp.add("X-mailer");
  >       folder.fetch(msgs, fp);

  See Also:
    `Folder.fetch(javax.mail.Message[], javax.mail.FetchProfile)`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `FetchProfile.Item` This inner class is the base class of all items that can be requested in a FetchProfile.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FetchProfile()` Create an empty FetchProfile.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(FetchProfile.Item item)` Add the given special item as one of the attributes to be prefetched.
    `void` | `add(java.lang.String headerName)` Add the specified header-field to the list of attributes to be prefetched.
    `boolean` | `contains(FetchProfile.Item item)` Returns true if the fetch profile contains given special item.
    `boolean` | `contains(java.lang.String headerName)` Returns true if the fetch profile contains given header name.
    `java.lang.String[]` | `getHeaderNames()` Get the names of the header-fields set in this profile.
    `FetchProfile.Item[]` | `getItems()` Get the items set in this profile.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### FetchProfile

          public FetchProfile()

      Create an empty FetchProfile.

  - ### Method Detail

    - #### add

          public void add(FetchProfile.Item item)

      Add the given special item as one of the attributes to be prefetched.
      Parameters:
        `item` - the special item to be fetched
      See Also:
        `FetchProfile.Item.ENVELOPE`, `FetchProfile.Item.CONTENT_INFO`, `FetchProfile.Item.FLAGS`

    - #### add

          public void add(java.lang.String headerName)

      Add the specified header-field to the list of attributes to be prefetched.
      Parameters:
        `headerName` - header to be prefetched

    - #### contains

          public boolean contains(FetchProfile.Item item)

      Returns true if the fetch profile contains given special item.

    - #### contains

          public boolean contains(java.lang.String headerName)

      Returns true if the fetch profile contains given header name.

    - #### getItems

          public FetchProfile.Item[] getItems()

      Get the items set in this profile.
      Returns:
        items set in this profile

    - #### getHeaderNames

          public java.lang.String[] getHeaderNames()

      Get the names of the header-fields set in this profile.
      Returns:
        headers set in this profile

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