com.isotrol.impe3.connectors.device.DeviceResolverByWidth.java Source code

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Here is the source code for com.isotrol.impe3.connectors.device.DeviceResolverByWidth.java

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/**
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Port@l 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 Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.isotrol.impe3.connectors.device;

import java.util.List;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterables;
import com.google.common.collect.Ordering;
import com.isotrol.impe3.api.DeviceCapabilities;
import com.isotrol.impe3.api.DeviceInPortal;
import com.isotrol.impe3.api.DeviceResolutionParams;
import com.isotrol.impe3.api.ResolvedDevice;

/**
 * Device resolver based in device width.
 * @author Andres Rodriguez
 */
public class DeviceResolverByWidth extends AbstractDeviceResolver {
    private static final Function<DeviceInPortal, Integer> WIDTH = new Function<DeviceInPortal, Integer>() {
        public Integer apply(DeviceInPortal input) {
            return input.getDevice().getWidth();
        }
    };
    private static final Predicate<DeviceInPortal> WITH_WIDTH = Predicates.compose(Predicates.notNull(), WIDTH);
    private static final Ordering<DeviceInPortal> ORDER = Ordering.natural().onResultOf(WIDTH).reverse();

    /**
     * Constructor.
     * @param config module configuration.
     */
    public DeviceResolverByWidth(DeviceResolverModuleConfig config) {
        super(config);
    }

    @Override
    ResolvedDevice resolve(DeviceResolutionParams params, Iterable<DeviceInPortal> devices) {
        final DeviceCapabilities caps = params.getCapabilities();
        if (caps == null || devices == null) {
            return null;
        }
        List<DeviceInPortal> ordered = ORDER.sortedCopy(Iterables.filter(devices, WITH_WIDTH));
        if (ordered == null || ordered.isEmpty()) {
            return null;
        }
        int width = caps.getWidth();
        for (DeviceInPortal dip : ordered) {
            if (width <= dip.getDevice().getWidth()) {
                return params.resolve(dip.getDevice());
            }
        }
        return params.resolve(ordered.get(ordered.size() - 1).getDevice());
    }
}