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/* MaskableEnvelopeEntry.java --

   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or (at

your option) any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301

USA

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version.  */

package gnu.javax.crypto.keyring;

import java.util.ArrayList;

import java.util.List;

/**

 * An envelope entry that can be "masked" -- placed in a state where the

 * envelope's contents cannot be accessed, due to the envelope not being fully

 * decoded, for example.

 */

public abstract class MaskableEnvelopeEntry

    extends EnvelopeEntry

{

  /** The masked state. */

  protected boolean masked;

  public MaskableEnvelopeEntry(int type, Properties properties)

  {

    super(type, properties);

  }

  protected MaskableEnvelopeEntry(int type)

  {

    super(type);

  }

  /**

   * Sets the masked state to the specified value.

   *

   * @param masked The new masked state.

   */

  protected final void setMasked(boolean masked)

  {

    this.masked = masked;

  }

  /**

   * Gets the masked state of this object. Certain operations on this object

   * will fail if it is masked.

   *

   * @return The current masked state.

   */

  public boolean isMasked()

  {

    return masked;

  }

  public void add(Entry entry)

  {

    if (isMasked())

      throw new IllegalStateException("masked envelope");

    super.add(entry);

  }

  public boolean containsEntry(Entry entry)

  {

    if (isMasked())

      throw new IllegalStateException("masked envelope");

    return super.containsEntry(entry);

  }

  public List getEntries()

  {

    if (isMasked())

      throw new IllegalStateException("masked envelope");

    return new ArrayList(entries);

  }

  public List get(String alias)

  {

    if (isMasked())

      throw new IllegalStateException("masked envelope");

    return super.get(alias);

  }

  public boolean remove(Entry entry)

  {

    if (isMasked())

      throw new IllegalStateException("masked envelope");

    return super.remove(entry);

  }

  public boolean remove(String alias)

  {

    if (isMasked())

      throw new IllegalStateException("masked envelope");

    return super.remove(alias);

  }

  public String toString()

  {

    return new StringBuilder("MaskableEnvelope{")

        .append(super.toString())

        .append(", masked=").append(masked)

        .append("}").toString();

  }

}