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 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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

 * 2 along with this work; if not, write to the Free Software Foundation,

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

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package javax.security.auth.callback;

/**

 * <p> Underlying security services instantiate and pass a

 * {@code ConfirmationCallback} to the {@code handle}

 * method of a {@code CallbackHandler} to ask for YES/NO,

 * OK/CANCEL, YES/NO/CANCEL or other similar confirmations.

 *

 * @since 1.4

 * @see javax.security.auth.callback.CallbackHandler

 */

public class ConfirmationCallback implements Callback, java.io.Serializable {

    private static final long serialVersionUID = -9095656433782481624L;

    /**

     * Unspecified option type.

     *

     * <p> The {@code getOptionType} method returns this

     * value if this {@code ConfirmationCallback} was instantiated

     * with {@code options} instead of an {@code optionType}.

     */

    public static final int UNSPECIFIED_OPTION          = -1;

    /**

     * YES/NO confirmation option.

     *

     * <p> An underlying security service specifies this as the

     * {@code optionType} to a {@code ConfirmationCallback}

     * constructor if it requires a confirmation which can be answered

     * with either {@code YES} or {@code NO}.

     */

    public static final int YES_NO_OPTION               = 0;

    /**

     * YES/NO/CANCEL confirmation confirmation option.

     *

     * <p> An underlying security service specifies this as the

     * {@code optionType} to a {@code ConfirmationCallback}

     * constructor if it requires a confirmation which can be answered

     * with either {@code YES}, {@code NO} or {@code CANCEL}.

     */

    public static final int YES_NO_CANCEL_OPTION        = 1;

    /**

     * OK/CANCEL confirmation confirmation option.

     *

     * <p> An underlying security service specifies this as the

     * {@code optionType} to a {@code ConfirmationCallback}

     * constructor if it requires a confirmation which can be answered

     * with either {@code OK} or {@code CANCEL}.

     */

    public static final int OK_CANCEL_OPTION            = 2;

    /**

     * YES option.

     *

     * <p> If an {@code optionType} was specified to this

     * {@code ConfirmationCallback}, this option may be specified as a

     * {@code defaultOption} or returned as the selected index.

     */

    public static final int YES                         = 0;

    /**

     * NO option.

     *

     * <p> If an {@code optionType} was specified to this

     * {@code ConfirmationCallback}, this option may be specified as a

     * {@code defaultOption} or returned as the selected index.

     */

    public static final int NO                          = 1;

    /**

     * CANCEL option.

     *

     * <p> If an {@code optionType} was specified to this

     * {@code ConfirmationCallback}, this option may be specified as a

     * {@code defaultOption} or returned as the selected index.

     */

    public static final int CANCEL                      = 2;

    /**

     * OK option.

     *

     * <p> If an {@code optionType} was specified to this

     * {@code ConfirmationCallback}, this option may be specified as a

     * {@code defaultOption} or returned as the selected index.

     */

    public static final int OK                          = 3;

    /** INFORMATION message type.  */

    public static final int INFORMATION                 = 0;

    /** WARNING message type. */

    public static final int WARNING                     = 1;

    /** ERROR message type. */

    public static final int ERROR                       = 2;

    /**

     * @serial

     * @since 1.4

     */

    private String prompt;

    /**

     * @serial

     * @since 1.4

     */

    private int messageType;

    /**

     * @serial

     * @since 1.4

     */

    private int optionType = UNSPECIFIED_OPTION;

    /**

     * @serial

     * @since 1.4

     */

    private int defaultOption;

    /**

     * @serial

     * @since 1.4

     */

    private String[] options;

    /**

     * @serial

     * @since 1.4

     */

    private int selection;

    /**

     * Construct a {@code ConfirmationCallback} with a

     * message type, an option type and a default option.

     *

     * <p> Underlying security services use this constructor if

     * they require either a YES/NO, YES/NO/CANCEL or OK/CANCEL

     * confirmation.

     *

     * @param messageType the message type ({@code INFORMATION},

     *                  {@code WARNING} or {@code ERROR}).

     *

     * @param optionType the option type ({@code YES_NO_OPTION},

     *                  {@code YES_NO_CANCEL_OPTION} or

     *                  {@code OK_CANCEL_OPTION}).

     *

     * @param defaultOption the default option

     *                  from the provided optionType ({@code YES},

     *                  {@code NO}, {@code CANCEL} or

     *                  {@code OK}).

     *

     * @exception IllegalArgumentException if messageType is not either

     *                  {@code INFORMATION}, {@code WARNING},

     *                  or {@code ERROR}, if optionType is not either

     *                  {@code YES_NO_OPTION},

     *                  {@code YES_NO_CANCEL_OPTION}, or

     *                  {@code OK_CANCEL_OPTION},

     *                  or if {@code defaultOption}

     *                  does not correspond to one of the options in

     *                  {@code optionType}.

     */

    public ConfirmationCallback(int messageType,

                int optionType, int defaultOption) {

        if (messageType < INFORMATION || messageType > ERROR ||

            optionType < YES_NO_OPTION || optionType > OK_CANCEL_OPTION)

            throw new IllegalArgumentException();

        switch (optionType) {

        case YES_NO_OPTION:

            if (defaultOption != YES && defaultOption != NO)

                throw new IllegalArgumentException();

            break;

        case YES_NO_CANCEL_OPTION:

            if (defaultOption != YES && defaultOption != NO &&

                defaultOption != CANCEL)

                throw new IllegalArgumentException();

            break;

        case OK_CANCEL_OPTION:

            if (defaultOption != OK && defaultOption != CANCEL)

                throw new IllegalArgumentException();

            break;

        }

        this.messageType = messageType;

        this.optionType = optionType;

        this.defaultOption = defaultOption;

    }

    /**

     * Construct a {@code ConfirmationCallback} with a

     * message type, a list of options and a default option.

     *

     * <p> Underlying security services use this constructor if

     * they require a confirmation different from the available preset

     * confirmations provided (for example, CONTINUE/ABORT or STOP/GO).

     * The confirmation options are listed in the {@code options} array,

     * and are displayed by the {@code CallbackHandler} implementation

     * in a manner consistent with the way preset options are displayed.

     *

     * @param messageType the message type ({@code INFORMATION},

     *                  {@code WARNING} or {@code ERROR}).

     *

     * @param options the list of confirmation options.

     *

     * @param defaultOption the default option, represented as an index

     *                  into the {@code options} array.

     *

     * @exception IllegalArgumentException if messageType is not either

     *                  {@code INFORMATION}, {@code WARNING},

     *                  or {@code ERROR}, if {@code options} is null,

     *                  if {@code options} has a length of 0,

     *                  if any element from {@code options} is null,

     *                  if any element from {@code options}

     *                  has a length of 0, or if {@code defaultOption}

     *                  does not lie within the array boundaries of

     *                  {@code options}.

     */

    public ConfirmationCallback(int messageType,

                String[] options, int defaultOption) {

        if (messageType < INFORMATION || messageType > ERROR ||

            options == null || options.length == 0 ||

            defaultOption < 0 || defaultOption >= options.length)

            throw new IllegalArgumentException();

        for (int i = 0; i < options.length; i++) {

                throw new IllegalArgumentException();

        }

        this.messageType = messageType;

        this.options = options;

        this.defaultOption = defaultOption;

    }

    /**

     * Construct a {@code ConfirmationCallback} with a prompt,

     * message type, an option type and a default option.

     *

     * <p> Underlying security services use this constructor if

     * they require either a YES/NO, YES/NO/CANCEL or OK/CANCEL

     * confirmation.

     *

     * @param prompt the prompt used to describe the list of options.

     *

     * @param messageType the message type ({@code INFORMATION},

     *                  {@code WARNING} or {@code ERROR}).

     *

     * @param optionType the option type ({@code YES_NO_OPTION},

     *                  {@code YES_NO_CANCEL_OPTION} or

     *                  {@code OK_CANCEL_OPTION}).

     *

     * @param defaultOption the default option

     *                  from the provided optionType ({@code YES},

     *                  {@code NO}, {@code CANCEL} or

     *                  {@code OK}).

     *

     * @exception IllegalArgumentException if {@code prompt} is null,

     *                  if {@code prompt} has a length of 0,

     *                  if messageType is not either

     *                  {@code INFORMATION}, {@code WARNING},

     *                  or {@code ERROR}, if optionType is not either

     *                  {@code YES_NO_OPTION},

     *                  {@code YES_NO_CANCEL_OPTION}, or

     *                  {@code OK_CANCEL_OPTION},

     *                  or if {@code defaultOption}

     *                  does not correspond to one of the options in

     *                  {@code optionType}.

     */

    public ConfirmationCallback(String prompt, int messageType,

                int optionType, int defaultOption) {

            messageType < INFORMATION || messageType > ERROR ||

            optionType < YES_NO_OPTION || optionType > OK_CANCEL_OPTION)

            throw new IllegalArgumentException();

        switch (optionType) {

        case YES_NO_OPTION:

            if (defaultOption != YES && defaultOption != NO)

                throw new IllegalArgumentException();

            break;

        case YES_NO_CANCEL_OPTION:

            if (defaultOption != YES && defaultOption != NO &&

                defaultOption != CANCEL)

                throw new IllegalArgumentException();

            break;

        case OK_CANCEL_OPTION:

            if (defaultOption != OK && defaultOption != CANCEL)

                throw new IllegalArgumentException();

            break;

        }

        this.prompt = prompt;

        this.messageType = messageType;

        this.optionType = optionType;

        this.defaultOption = defaultOption;

    }

    /**

     * Construct a {@code ConfirmationCallback} with a prompt,

     * message type, a list of options and a default option.

     *

     * <p> Underlying security services use this constructor if

     * they require a confirmation different from the available preset

     * confirmations provided (for example, CONTINUE/ABORT or STOP/GO).

     * The confirmation options are listed in the {@code options} array,

     * and are displayed by the {@code CallbackHandler} implementation

     * in a manner consistent with the way preset options are displayed.

     *

     * @param prompt the prompt used to describe the list of options.

     *

     * @param messageType the message type ({@code INFORMATION},

     *                  {@code WARNING} or {@code ERROR}).

     *

     * @param options the list of confirmation options.

     *

     * @param defaultOption the default option, represented as an index

     *                  into the {@code options} array.

     *

     * @exception IllegalArgumentException if {@code prompt} is null,

     *                  if {@code prompt} has a length of 0,

     *                  if messageType is not either

     *                  {@code INFORMATION}, {@code WARNING},

     *                  or {@code ERROR}, if {@code options} is null,

     *                  if {@code options} has a length of 0,

     *                  if any element from {@code options} is null,

     *                  if any element from {@code options}

     *                  has a length of 0, or if {@code defaultOption}

     *                  does not lie within the array boundaries of

     *                  {@code options}.

     */

    public ConfirmationCallback(String prompt, int messageType,

                String[] options, int defaultOption) {

            messageType < INFORMATION || messageType > ERROR ||

            options == null || options.length == 0 ||

            defaultOption < 0 || defaultOption >= options.length)

            throw new IllegalArgumentException();

        for (int i = 0; i < options.length; i++) {

                throw new IllegalArgumentException();

        }

        this.prompt = prompt;

        this.messageType = messageType;

        this.options = options;

        this.defaultOption = defaultOption;

    }

    /**

     * Get the prompt.

     *

     * @return the prompt, or null if this {@code ConfirmationCallback}

     *          was instantiated without a {@code prompt}.

     */

    public String getPrompt() {

        return prompt;

    }

    /**

     * Get the message type.

     *

     * @return the message type ({@code INFORMATION},

     *          {@code WARNING} or {@code ERROR}).

     */

    public int getMessageType() {

        return messageType;

    }

    /**

     * Get the option type.

     *

     * <p> If this method returns {@code UNSPECIFIED_OPTION}, then this

     * {@code ConfirmationCallback} was instantiated with

     * {@code options} instead of an {@code optionType}.

     * In this case, invoke the {@code getOptions} method

     * to determine which confirmation options to display.

     *

     * @return the option type ({@code YES_NO_OPTION},

     *          {@code YES_NO_CANCEL_OPTION} or

     *          {@code OK_CANCEL_OPTION}), or

     *          {@code UNSPECIFIED_OPTION} if this

     *          {@code ConfirmationCallback} was instantiated with

     *          {@code options} instead of an {@code optionType}.

     */

    public int getOptionType() {

        return optionType;

    }

    /**

     * Get the confirmation options.

     *

     * @return the list of confirmation options, or null if this

     *          {@code ConfirmationCallback} was instantiated with

     *          an {@code optionType} instead of {@code options}.

     */

    public String[] getOptions() {

        return options;

    }

    /**

     * Get the default option.

     *

     * @return the default option, represented as

     *          {@code YES}, {@code NO}, {@code OK} or

     *          {@code CANCEL} if an {@code optionType}

     *          was specified to the constructor of this

     *          {@code ConfirmationCallback}.

     *          Otherwise, this method returns the default option as

     *          an index into the

     *          {@code options} array specified to the constructor

     *          of this {@code ConfirmationCallback}.

     */

    public int getDefaultOption() {

        return defaultOption;

    }

    /**

     * Set the selected confirmation option.

     *

     * @param selection the selection represented as {@code YES},

     *          {@code NO}, {@code OK} or {@code CANCEL}

     *          if an {@code optionType} was specified to the constructor

     *          of this {@code ConfirmationCallback}.

     *          Otherwise, the selection represents the index into the

     *          {@code options} array specified to the constructor

     *          of this {@code ConfirmationCallback}.

     *

     * @see #getSelectedIndex

     */

    public void setSelectedIndex(int selection) {

        this.selection = selection;

    }

    /**

     * Get the selected confirmation option.

     *

     * @return the selected confirmation option represented as

     *          {@code YES}, {@code NO}, {@code OK} or

     *          {@code CANCEL} if an {@code optionType}

     *          was specified to the constructor of this

     *          {@code ConfirmationCallback}.

     *          Otherwise, this method returns the selected confirmation

     *          option as an index into the

     *          {@code options} array specified to the constructor

     *          of this {@code ConfirmationCallback}.

     *

     * @see #setSelectedIndex

     */

    public int getSelectedIndex() {

        return selection;

    }

}