Android Open Source - FileChooserActivity History

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License

The source code is released under:

Apache License

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Java Source Code

/*
 *   Copyright 2012 Hai Bison//  www  .  ja v  a  2 s  .com
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

package group.pals.android.lib.ui.filechooser.utils;

/**
 * A history store of any object.
 * 
 * @author Hai Bison
 * 
 * @param <A>
 *            any type
 * @since v2.0 alpha
 */
public interface History<A> {

    /**
     * Pushes new item to the history.
     * 
     * @param currentItem
     *            usage: assume we have history of: 1-2-3-4, if current item is
     *            3, and we push 5 to the history, then 4 will be truncated, and
     *            new history will be 1-2-3-5
     * @param newItem
     *            the new item
     */
    public void push(A currentItem, A newItem);

    /**
     * Gets size of the history
     * 
     * @return the size of the history
     */
    public int size();

    /**
     * Gets index of item {@code a}
     * 
     * @param a
     *            an item
     * @return index of the {@code a}, or -1 if there is no one
     */
    public int indexOf(A a);

    /**
     * Gets previous item of {@code a}
     * 
     * @param a
     *            current item
     * @return the previous item, can be {@code null}
     */
    public A prevOf(A a);

    /**
     * Gets next item of {@code a}
     * 
     * @param a
     *            current item
     * @return the next item, can be {@code null}
     */
    public A nextOf(A a);
}

Java Source Code List