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/*
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 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
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 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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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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