Flags (Java EE 5 SDK)

javax.mail Class Flags

java.lang.Object
  javax.mail.Flags

所有已实现的接口:

Serializable, Cloneable

public class Flags

extends Object

implements Cloneable, Serializable

The Flags class represents the set of flags on a Message. Flags are composed of predefined system flags, and user defined flags.

A System flag is represented by the Flags.Flag inner class. A User defined flag is represented as a String. User flags are case-independent.

A set of standard system flags are predefined. Most folder implementations are expected to support these flags. Some implementations may also support arbitrary user-defined flags. The getPermanentFlags method on a Folder returns a Flags object that holds all the flags that are supported by that folder implementation.

A Flags object is serializable so that (for example) the use of Flags objects in search terms can be serialized along with the search terms.

Warning: Serialized objects of this class may not be compatible with future JavaMail API releases. The current serialization support is appropriate for short term storage.

The below code sample illustrates how to set, examine and get the flags for a message.

 Message m = folder.getMessage(1);
 m.setFlag(Flags.Flag.DELETED, true); // set the DELETED flag

 // Check if DELETED flag is set of this message
 if (m.isSet(Flags.Flag.DELETED))
        System.out.println("DELETED message");

 // Examine ALL system flags for this message
 Flags flags = m.getFlags();
 Flags.Flag[] sf = flags.getSystemFlags();
 for (int i = 0; i < sf.length; i++) {
        if (sf[i] == Flags.Flag.DELETED)
            System.out.println("DELETED message");
        else if (sf[i] == Flags.Flag.SEEN)
            System.out.println("SEEN message");
      ......
      ......
 }
 

作者:

John Mani, Bill Shannon

另请参见:

Folder.getPermanentFlags(), Serialized Form

Flags

public Flags()

Construct an empty Flags object.

Flags

public Flags(Flags flags)

Construct a Flags object initialized with the given flags.

参数:

flags - the flags for initialization

Flags

public Flags(Flags.Flag flag)

Construct a Flags object initialized with the given system flag.

参数:

flag - the flag for initialization

Flags

public Flags(String flag)

Construct a Flags object initialized with the given user flag.

参数:

flag - the flag for initialization

add

public void add(Flags.Flag flag)

Add the specified system flag to this Flags object.

参数:

flag - the flag to add

add

public void add(String flag)

Add the specified user flag to this Flags object.

参数:

flag - the flag to add

add

public void add(Flags f)

Add all the flags in the given Flags object to this Flags object.

参数:

f - Flags object

remove

public void remove(Flags.Flag flag)

Remove the specified system flag from this Flags object.

参数:

flag - the flag to be removed

remove

public void remove(String flag)

Remove the specified user flag from this Flags object.

参数:

flag - the flag to be removed

remove

public void remove(Flags f)

Remove all flags in the given Flags object from this Flags object.

参数:

f - the flag to be removed

contains

public boolean contains(Flags.Flag flag)

Check whether the specified system flag is present in this Flags object.

返回:

true of the given flag is present, otherwise false.

contains

public boolean contains(String flag)

Check whether the specified user flag is present in this Flags object.

返回:

true of the given flag is present, otherwise false.

contains

public boolean contains(Flags f)

Check whether all the flags in the specified Flags object are present in this Flags object.

返回:

true if all flags in the given Flags object are present, otherwise false.

equals

public boolean equals(Object obj)

Check whether the two Flags objects are equal.

重写:

equals in class Object

返回:

true if they're equal

hashCode

public int hashCode()

Compute a hash code for this Flags object.

重写:

hashCode in class Object

返回:

the hash code

getSystemFlags

public Flags.Flag[] getSystemFlags()

Return all the system flags in this Flags object. Returns an array of size zero if no flags are set.

返回:

array of Flags.Flag objects representing system flags

getUserFlags

public String[] getUserFlags()

Return all the user flags in this Flags object. Returns an array of size zero if no flags are set.

返回:

array of Strings, each String represents a flag.

clone

public Object clone()

Returns a clone of this Flags object.

重写:

clone in class Object

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