Android Open Source - Android-J0Loader Single U R I Queue

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License

The source code is released under:

MIT License

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Java Source Code

/*
 * The MIT License Copyright (c) 2014 Krayushkin Konstantin (jangokvk@gmail.com)
 */*from   ww  w . j ava2 s  . com*/
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package ru.jango.j0loader.queue;

import java.net.URI;

import ru.jango.j0loader.Request;

/**
 * Special queue for {@link ru.jango.j0loader.image.ImageLoader}. Basically this loader doesn't need
 * requests' {@link ru.jango.j0loader.Request#params} - it needs only {@link java.net.URI}, so we 
 * can uniquely identify a queue element by it's uri, not combination of uri-params.
 * <br><br>
 * That queue checks {@link java.net.URI} inside a {@link ru.jango.j0loader.Request} before adding
 * it, so it contains requests with unique URIs.
 */
public class SingleURIQueue extends DefaultQueue {

    /**
     * Removes from queue all requests with the specified {@link java.net.URI}. Actually there
     * should be only one element to remove, otherwise something somewhere went wrong some time ago.
     *
     * @param uri   {@link java.net.URI} to search and remove
     * @return      TRUE if the queue was modified
     */
    public synchronized boolean remove(URI uri) {
        boolean mod = false;
        for (int i=0; i<queue.size(); i++)
            if (queue.get(i).getURI().equals(uri)) {
                queue.remove(i);
                mod = true;
                i--;
            }

        return mod;
    }

    /**
     * Checks if a request with certain {@link java.net.URI} is in queue.
     */
    public synchronized boolean contains(URI uri) {
        for (Request request : queue)
            if (request.getURI().equals(uri))
                return true;

        return false;
    }

    @Override
    public synchronized void add(Request request) {
        if (request != null && !contains(request.getURI()))
            queue.add(request);
    }

    @Override
    public synchronized boolean insert(int pos, Request request) {
        if (request == null || pos < 0 || pos > queue.size() || contains(request.getURI()))
            return false;

        queue.add(pos, request);
        return true;
    }

}

Java Source Code List