/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.util.cli;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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/**
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* The result of running a {@link Menu}. The result indicates to the
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* application how it should proceed:
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* <ul>
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* <li>{@link #again()} - the menu should be displayed again. A good
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* example of this is when a user chooses to view some help. Normally,
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* after the help is displayed, the user is allowed to select another
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* option
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* <li>{@link #cancel()} - the user chose to cancel any task
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* currently in progress and go back to the previous main menu if
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* applicable
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* <li>{@link #success()} - the user chose to apply any task
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* currently in progress and go back to the previous menu if
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* applicable. Any result values applicable to the chosen option can
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* be retrieved using {@link #getValue()} or {@link #getValues()}
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* <li>{@link #quit()} - the user chose to quit the application and
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* cancel all outstanding tasks.
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* </ul>
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*
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* @param <T>
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* The type of result value(s) contained in success results.
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* Use <code>Void</code> if success results should not
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* contain values.
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*/
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public final class MenuResult<T> {
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/**
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* The type of result returned from the menu.
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*/
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private static enum Type {
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/**
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* The user selected an option which did not return a result, so
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* the menu should be displayed again.
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*/
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AGAIN,
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/**
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* The user did not select an option and instead chose to cancel
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* the current task.
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*/
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CANCEL,
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/**
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* The user did not select an option and instead chose to quit the
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* entire application.
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*/
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QUIT,
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/**
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* The user selected an option which succeeded and returned one or
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* more result values.
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*/
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SUCCESS
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}
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/**
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* Creates a new menu result indicating that the menu should be
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* displayed again. A good example of this is when a user chooses to
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* view some help. Normally, after the help is displayed, the user
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* is allowed to select another option.
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*
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* @param <T>
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* The type of result value(s) contained in success
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* results. Use <code>Void</code> if success results
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* should not contain values.
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* @return Returns a new menu result indicating that the menu should
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* be displayed again.
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*/
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public static <T> MenuResult<T> again() {
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return new MenuResult<T>(Type.AGAIN, Collections.<T> emptyList());
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}
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/**
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* Creates a new menu result indicating that the user chose to
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* cancel any task currently in progress and go back to the previous
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* main menu if applicable.
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*
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* @param <T>
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* The type of result value(s) contained in success
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* results. Use <code>Void</code> if success results
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* should not contain values.
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* @return Returns a new menu result indicating that the user chose
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* to cancel any task currently in progress and go back to
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* the previous main menu if applicable.
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*/
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public static <T> MenuResult<T> cancel() {
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return new MenuResult<T>(Type.CANCEL, Collections.<T> emptyList());
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}
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/**
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* Creates a new menu result indicating that the user chose to quit
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* the application and cancel all outstanding tasks.
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*
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* @param <T>
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* The type of result value(s) contained in success
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* results. Use <code>Void</code> if success results
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* should not contain values.
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* @return Returns a new menu result indicating that the user chose
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* to quit the application and cancel all outstanding tasks.
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*/
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public static <T> MenuResult<T> quit() {
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return new MenuResult<T>(Type.QUIT, Collections.<T> emptyList());
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}
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/**
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* Creates a new menu result indicating that the user chose to apply
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* any task currently in progress and go back to the previous menu
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* if applicable. The menu result will not contain any result
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* values.
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*
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* @param <T>
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* The type of result value(s) contained in success
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* results. Use <code>Void</code> if success results
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* should not contain values.
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* @return Returns a new menu result indicating that the user chose
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* to apply any task currently in progress and go back to
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* the previous menu if applicable.The menu result will not
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* contain any result values.
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*/
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public static <T> MenuResult<T> success() {
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return success(Collections.<T> emptySet());
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}
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/**
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* Creates a new menu result indicating that the user chose to apply
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* any task currently in progress and go back to the previous menu
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* if applicable. The menu result will contain the provided values,
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* which can be retrieved using {@link #getValue()} or
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* {@link #getValues()}.
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*
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* @param <T>
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* The type of the result values.
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* @param values
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* The result values.
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* @return Returns a new menu result indicating that the user chose
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* to apply any task currently in progress and go back to
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* the previous menu if applicable. The menu result will
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* contain the provided values, which can be retrieved using
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* {@link #getValue()} or {@link #getValues()}.
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*/
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public static <T> MenuResult<T> success(Collection<T> values) {
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return new MenuResult<T>(Type.SUCCESS, new ArrayList<T>(values));
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}
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/**
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* Creates a new menu result indicating that the user chose to apply
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* any task currently in progress and go back to the previous menu
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* if applicable. The menu result will contain the provided value,
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* which can be retrieved using {@link #getValue()} or
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* {@link #getValues()}.
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*
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* @param <T>
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* The type of the result value.
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* @param value
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* The result value.
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* @return Returns a new menu result indicating that the user chose
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* to apply any task currently in progress and go back to
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* the previous menu if applicable. The menu result will
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* contain the provided value, which can be retrieved using
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* {@link #getValue()} or {@link #getValues()}.
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*/
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public static <T> MenuResult<T> success(T value) {
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return success(Collections.singleton(value));
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}
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// The type of result returned from the menu.
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private final Type type;
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// The menu result value(s).
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private final Collection<T> values;
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// Private constructor.
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private MenuResult(Type type, Collection<T> values) {
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this.type = type;
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this.values = values;
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}
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/**
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* Gets the menu result value if this is a menu result indicating
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* success.
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*
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* @return Returns the menu result value, or <code>null</code> if
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* there was no result value or if this is not a success
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* menu result.
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* @see #isSuccess()
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*/
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public T getValue() {
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if (values.isEmpty()) {
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return null;
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} else {
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return values.iterator().next();
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}
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}
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/**
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* Gets the menu result values if this is a menu result indicating
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* success.
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*
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* @return Returns the menu result values, which may be empty if
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* there were no result values or if this is not a success
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* menu result.
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* @see #isSuccess()
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*/
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public Collection<T> getValues() {
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return new ArrayList<T>(values);
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}
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/**
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* Determines if this menu result indicates that the menu should be
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* displayed again. A good example of this is when a user chooses to
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* view some help. Normally, after the help is displayed, the user
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* is allowed to select another option.
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*
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* @return Returns <code>true</code> if this menu result indicates
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* that the menu should be displayed again.
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*/
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public boolean isAgain() {
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return type == Type.AGAIN;
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}
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/**
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* Determines if this menu result indicates that the user chose to
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* cancel any task currently in progress and go back to the previous
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* main menu if applicable.
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*
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* @return Returns <code>true</code> if this menu result indicates
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* that the user chose to cancel any task currently in
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* progress and go back to the previous main menu if
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* applicable.
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*/
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public boolean isCancel() {
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return type == Type.CANCEL;
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}
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/**
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* Determines if this menu result indicates that the user chose to
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* quit the application and cancel all outstanding tasks.
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*
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* @return Returns <code>true</code> if this menu result indicates
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* that the user chose to quit the application and cancel
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* all outstanding tasks.
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*/
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public boolean isQuit() {
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return type == Type.QUIT;
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}
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/**
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* Determines if this menu result indicates that the user chose to
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* apply any task currently in progress and go back to the previous
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* menu if applicable. Any result values can be retrieved using the
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* {@link #getValue()} or {@link #getValues()} methods.
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*
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* @return Returns <code>true</code> if this menu result indicates
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* that the user chose to apply any task currently in
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* progress and go back to the previous menu if applicable.
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* @see #getValue()
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* @see #getValues()
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*/
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public boolean isSuccess() {
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return type == Type.SUCCESS;
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}
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}
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