ResourceContainer.java

/**
 * Copyright (c) 2013, Redsolution LTD. All rights reserved.
 *
 * This file is part of Xabber project; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License, Version 3.
 *
 * Xabber 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 this program. If not, see http://www.gnu.org/licenses/.
 */
package com.xabber.android.data.roster;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Contains information about resources for specified bare address.
 *
 * @author alexander.ivanov
 */
class ResourceContainer {

    /**
     * List of available resources for its STRING-PREPed resources.
     */
    private final Map<String, ResourceItem> resourceItems;

    /**
     * Best resource.
     */
    private ResourceItem best;

    public ResourceContainer() {
        resourceItems = new HashMap<String, ResourceItem>();
        best = null;
    }

    /**
     * @return Best resource according priority. <code>null</code> can be
     * returned.
     */
    ResourceItem getBest() {
        return best;
    }

    /**
     * Update information about best resource.
     */
    void updateBest() {
        String bestKey = null;
        ResourceItem bestResource = null;
        for (Entry<String, ResourceItem> entry : resourceItems.entrySet()) {
            String key = entry.getKey();
            ResourceItem resource = entry.getValue();
            if (bestResource == null) {
                bestKey = key;
                bestResource = resource;
            } else {
                int result = resource.compareTo(bestResource);
                if (result > 0 || (result == 0 && key.compareTo(bestKey) > 0))
                    bestResource = resource;
            }
        }
        this.best = bestResource;
    }

    /**
     * @param resource
     * @return Resource item for specified resource name. <code>null</code> can
     * be returned.
     */
    ResourceItem get(String resource) {
        return resourceItems.get(resource);
    }

    /**
     * Adds new resource item.
     *
     * @param resource
     * @param resourceItem
     */
    void put(String resource, ResourceItem resourceItem) {
        resourceItems.put(resource, resourceItem);
    }

    /**
     * Removes resource item.
     *
     * @param resource
     */
    void remove(String resource) {
        resourceItems.remove(resource);
    }

    /**
     * @return Collection with available resources.
     */
    Collection<ResourceItem> getResourceItems() {
        return Collections.unmodifiableCollection(resourceItems.values());
    }

}