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*/
/*
* @(#)Flags.java 1.22 07/05/14
*/
package javax.mail;
import java.io.Serializable;
import java.util.*;
/**
* The Flags class represents the set of flags on a Message. Flags
* are composed of predefined system flags, and user defined flags. <p>
*
* A System flag is represented by the <code>Flags.Flag</code>
* inner class. A User defined flag is represented as a String.
* User flags are case-independent. <p>
*
* 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
* <code>getPermanentFlags</code> method on a Folder returns a Flags
* object that holds all the flags that are supported by that folder
* implementation. <p>
*
* 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. <p>
*
* <strong>Warning:</strong>
* Serialized objects of this class may not be compatible with future
* JavaMail API releases. The current serialization support is
* appropriate for short term storage. <p>
*
* The below code sample illustrates how to set, examine and get the
* flags for a message. <p>
* <pre>
*
* 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");
* ......
* ......
* }
* </pre>
* <p>
*
* @see Folder#getPermanentFlags
* @author John Mani
* @author Bill Shannon
*/
public class Flags implements Cloneable, Serializable {
private int system_flags = 0;
private Hashtable user_flags = null;
private final static int ANSWERED_BIT = 0x01;
private final static int DELETED_BIT = 0x02;
private final static int DRAFT_BIT = 0x04;
private final static int FLAGGED_BIT = 0x08;
private final static int RECENT_BIT = 0x10;
private final static int SEEN_BIT = 0x20;
private final static int USER_BIT = 0x80000000;
private static final long serialVersionUID = 6243590407214169028L;
/**
* This inner class represents an individual system flag. A set
* of standard system flag objects are predefined here.
*/
public static final class Flag {
/**
* This message has been answered. This flag is set by clients
* to indicate that this message has been answered to.
*/
public static final Flag ANSWERED = new Flag(ANSWERED_BIT);
/**
* This message is marked deleted. Clients set this flag to
* mark a message as deleted. The expunge operation on a folder
* removes all messages in that folder that are marked for deletion.
*/
public static final Flag DELETED = new Flag(DELETED_BIT);
/**
* This message is a draft. This flag is set by clients
* to indicate that the message is a draft message.
*/
public static final Flag DRAFT = new Flag(DRAFT_BIT);
/**
* This message is flagged. No semantic is defined for this flag.
* Clients alter this flag.
*/
public static final Flag FLAGGED = new Flag(FLAGGED_BIT);
/**
* This message is recent. Folder implementations set this flag
* to indicate that this message is new to this folder, that is,
* it has arrived since the last time this folder was opened. <p>
*
* Clients cannot alter this flag.
*/
public static final Flag RECENT = new Flag(RECENT_BIT);
/**
* This message is seen. This flag is implicitly set by the
* implementation when the this Message's content is returned
* to the client in some form. The <code>getInputStream</code>
* and <code>getContent</code> methods on Message cause this
* flag to be set. <p>
*
* Clients can alter this flag.
*/
public static final Flag SEEN = new Flag(SEEN_BIT);
/**
* A special flag that indicates that this folder supports
* user defined flags. <p>
*
* The implementation sets this flag. Clients cannot alter
* this flag but can use it to determine if a folder supports
* user defined flags by using
* <code>folder.getPermanentFlags().contains(Flags.Flag.USER)</code>.
*/
public static final Flag USER = new Flag(USER_BIT);
// flags are stored as bits for efficiency
private int bit;
private Flag(int bit) {
this.bit = bit;
}
}
/**
* Construct an empty Flags object.
*/
public Flags() { }
/**
* Construct a Flags object initialized with the given flags.
*
* @param flags the flags for initialization
*/
public Flags(Flags flags) {
this.system_flags = flags.system_flags;
if (flags.user_flags != null)
this.user_flags = (Hashtable)flags.user_flags.clone();
}
/**
* Construct a Flags object initialized with the given system flag.
*
* @param flag the flag for initialization
*/
public Flags(Flag flag) {
this.system_flags |= flag.bit;
}
/**
* Construct a Flags object initialized with the given user flag.
*
* @param flag the flag for initialization
*/
public Flags(String flag) {
user_flags = new Hashtable(1);
user_flags.put(flag.toLowerCase(Locale.ENGLISH), flag);
}
/**
* Add the specified system flag to this Flags object.
*
* @param flag the flag to add
*/
public void add(Flag flag) {
system_flags |= flag.bit;
}
/**
* Add the specified user flag to this Flags object.
*
* @param flag the flag to add
*/
public void add(String flag) {
if (user_flags == null)
user_flags = new Hashtable(1);
user_flags.put(flag.toLowerCase(Locale.ENGLISH), flag);
}
/**
* Add all the flags in the given Flags object to this
* Flags object.
*
* @param f Flags object
*/
public void add(Flags f) {
system_flags |= f.system_flags; // add system flags
if (f.user_flags != null) { // add user-defined flags
if (user_flags == null)
user_flags = new Hashtable(1);
Enumeration e = f.user_flags.keys();
while (e.hasMoreElements()) {
String s = (String)e.nextElement();
user_flags.put(s, f.user_flags.get(s));
}
}
}
/**
* Remove the specified system flag from this Flags object.
*
* @param flag the flag to be removed
*/
public void remove(Flag flag) {
system_flags &= ~flag.bit;
}
/**
* Remove the specified user flag from this Flags object.
*
* @param flag the flag to be removed
*/
public void remove(String flag) {
if (user_flags != null)
user_flags.remove(flag.toLowerCase(Locale.ENGLISH));
}
/**
* Remove all flags in the given Flags object from this
* Flags object.
*
* @param f the flag to be removed
*/
public void remove(Flags f) {
system_flags &= ~f.system_flags; // remove system flags
if (f.user_flags != null) {
if (user_flags == null)
return;
Enumeration e = f.user_flags.keys();
while (e.hasMoreElements())
user_flags.remove(e.nextElement());
}
}
/**
* Check whether the specified system flag is present in this Flags object.
*
* @return true of the given flag is present, otherwise false.
*/
public boolean contains(Flag flag) {
return (system_flags & flag.bit) != 0;
}
/**
* Check whether the specified user flag is present in this Flags object.
*
* @return true of the given flag is present, otherwise false.
*/
public boolean contains(String flag) {
if (user_flags == null)
return false;
else
return user_flags.containsKey(flag.toLowerCase(Locale.ENGLISH));
}
/**
* Check whether all the flags in the specified Flags object are
* present in this Flags object.
*
* @return true if all flags in the given Flags object are present,
* otherwise false.
*/
public boolean contains(Flags f) {
// Check system flags
if ((f.system_flags & system_flags) != f.system_flags)
return false;
// Check user flags
if (f.user_flags != null) {
if (user_flags == null)
return false;
Enumeration e = f.user_flags.keys();
while (e.hasMoreElements()) {
if (!user_flags.containsKey(e.nextElement()))
return false;
}
}
// If we've made it till here, return true
return true;
}
/**
* Check whether the two Flags objects are equal.
*
* @return true if they're equal
*/
public boolean equals(Object obj) {
if (!(obj instanceof Flags))
return false;
Flags f = (Flags)obj;
// Check system flags
if (f.system_flags != this.system_flags)
return false;
// Check user flags
if (f.user_flags == null && this.user_flags == null)
return true;
if (f.user_flags != null && this.user_flags != null &&
f.user_flags.size() == this.user_flags.size()) {
Enumeration e = f.user_flags.keys();
while (e.hasMoreElements()) {
if (!this.user_flags.containsKey(e.nextElement()))
return false;
}
return true;
}
return false;
}
/**
* Compute a hash code for this Flags object.
*
* @return the hash code
*/
public int hashCode() {
int hash = system_flags;
if (user_flags != null) {
Enumeration e = user_flags.keys();
while (e.hasMoreElements())
hash += ((String)e.nextElement()).hashCode();
}
return hash;
}
/**
* Return all the system flags in this Flags object. Returns
* an array of size zero if no flags are set.
*
* @return array of Flags.Flag objects representing system flags
*/
public Flag[] getSystemFlags() {
Vector v = new Vector();
if ((system_flags & ANSWERED_BIT) != 0)
v.addElement(Flag.ANSWERED);
if ((system_flags & DELETED_BIT) != 0)
v.addElement(Flag.DELETED);
if ((system_flags & DRAFT_BIT) != 0)
v.addElement(Flag.DRAFT);
if ((system_flags & FLAGGED_BIT) != 0)
v.addElement(Flag.FLAGGED);
if ((system_flags & RECENT_BIT) != 0)
v.addElement(Flag.RECENT);
if ((system_flags & SEEN_BIT) != 0)
v.addElement(Flag.SEEN);
if ((system_flags & USER_BIT) != 0)
v.addElement(Flag.USER);
Flag[] f = new Flag[v.size()];
v.copyInto(f);
return f;
}
/**
* Return all the user flags in this Flags object. Returns
* an array of size zero if no flags are set.
*
* @return array of Strings, each String represents a flag.
*/
public String[] getUserFlags() {
Vector v = new Vector();
if (user_flags != null) {
Enumeration e = user_flags.elements();
while (e.hasMoreElements())
v.addElement(e.nextElement());
}
String[] f = new String[v.size()];
v.copyInto(f);
return f;
}
/**
* Returns a clone of this Flags object.
*/
public Object clone() {
Flags f = null;
try {
f = (Flags)super.clone();
} catch (CloneNotSupportedException cex) {
// ignore, can't happen
}
if (this.user_flags != null && f != null)
f.user_flags = (Hashtable)this.user_flags.clone();
return f;
}
/*****
public static void main(String argv[]) throws Exception {
// a new flags object
Flags f1 = new Flags();
f1.add(Flags.Flag.DELETED);
f1.add(Flags.Flag.SEEN);
f1.add(Flags.Flag.RECENT);
f1.add(Flags.Flag.ANSWERED);
// check copy constructor with only system flags
Flags fc = new Flags(f1);
if (f1.equals(fc) && fc.equals(f1))
System.out.println("success");
else
System.out.println("fail");
// check clone with only system flags
fc = (Flags)f1.clone();
if (f1.equals(fc) && fc.equals(f1))
System.out.println("success");
else
System.out.println("fail");
// add a user flag and make sure it still works right
f1.add("MyFlag");
// shouldn't be equal here
if (!f1.equals(fc) && !fc.equals(f1))
System.out.println("success");
else
System.out.println("fail");
// check clone
fc = (Flags)f1.clone();
if (f1.equals(fc) && fc.equals(f1))
System.out.println("success");
else
System.out.println("fail");
// make sure user flag hash tables are separate
fc.add("AnotherFlag");
if (!f1.equals(fc) && !fc.equals(f1))
System.out.println("success");
else
System.out.println("fail");
// check copy constructor
fc = new Flags(f1);
if (f1.equals(fc) && fc.equals(f1))
System.out.println("success");
else
System.out.println("fail");
// another new flags object
Flags f2 = new Flags(Flags.Flag.ANSWERED);
f2.add("MyFlag");
if (f1.contains(Flags.Flag.DELETED))
System.out.println("success");
else
System.out.println("fail");
if (f1.contains(Flags.Flag.SEEN))
System.out.println("success");
else
System.out.println("fail");
if (f1.contains(Flags.Flag.RECENT))
System.out.println("success");
else
System.out.println("fail");
if (f1.contains("MyFlag"))
System.out.println("success");
else
System.out.println("fail");
if (f2.contains(Flags.Flag.ANSWERED))
System.out.println("success");
else
System.out.println("fail");
System.out.println("----------------");
String[] s = f1.getUserFlags();
for (int i = 0; i < s.length; i++)
System.out.println(s[i]);
System.out.println("----------------");
s = f2.getUserFlags();
for (int i = 0; i < s.length; i++)
System.out.println(s[i]);
System.out.println("----------------");
if (f1.contains(f2)) // this should be true
System.out.println("success");
else
System.out.println("fail");
if (!f2.contains(f1)) // this should be false
System.out.println("success");
else
System.out.println("fail");
Flags f3 = new Flags();
f3.add(Flags.Flag.DELETED);
f3.add(Flags.Flag.SEEN);
f3.add(Flags.Flag.RECENT);
f3.add(Flags.Flag.ANSWERED);
f3.add("ANOTHERFLAG");
f3.add("MYFLAG");
f1.add("AnotherFlag");
if (f1.equals(f3))
System.out.println("equals success");
else
System.out.println("fail");
if (f3.equals(f1))
System.out.println("equals success");
else
System.out.println("fail");
System.out.println("f1 hash code " + f1.hashCode());
System.out.println("f3 hash code " + f3.hashCode());
if (f1.hashCode() == f3.hashCode())
System.out.println("success");
else
System.out.println("fail");
}
****/
}
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