com.isotrol.impe3.web20.server.TimeMapConfig.java Source code

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Here is the source code for com.isotrol.impe3.web20.server.TimeMapConfig.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.web20.server;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import java.util.List;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

/**
 * Configuration values for time-based map caches.
 * @author Andres Rodriguez
 */
public abstract class TimeMapConfig {
    private static final TimeMapConfig DEFAULT = new Default();

    public static TimeMapConfig defaultConfig() {
        return DEFAULT;
    }

    public static TimeMapConfig delay(long seconds) {
        return new Delay(seconds);
    }

    public static TimeMapConfig create(long seconds, boolean global, List<Long> intervals) {
        if (intervals == null) {
            intervals = ImmutableList.of();
        }
        if (intervals.isEmpty()) {
            return delay(seconds);
        }
        return new Regular(seconds, global, intervals);
    }

    private TimeMapConfig() {
    }

    /**
     * Returns the computation delay.
     * @return The computation delay.
     */
    public abstract long getDelay();

    /**
     * Returns whether to include global map.
     * @return True if all-time values are included.
     */
    public abstract boolean isGlobal();

    /**
     * Returns the intervals to include.
     * @return Intervals represented as a list of "seconds from now".
     */
    public abstract ImmutableList<Long> getIntervals();

    private static final class Default extends TimeMapConfig {
        private Default() {
        }

        @Override
        public long getDelay() {
            return 30L;
        }

        @Override
        public ImmutableList<Long> getIntervals() {
            return ImmutableList.of();
        }

        @Override
        public boolean isGlobal() {
            return true;
        }
    }

    private static class Delay extends TimeMapConfig {
        private final long delay;

        Delay(long delay) {
            checkArgument(delay > 0L, "The delay must be > 0");
            this.delay = delay;
        }

        @Override
        public final long getDelay() {
            return delay;
        }

        @Override
        public ImmutableList<Long> getIntervals() {
            return ImmutableList.of();
        }

        @Override
        public boolean isGlobal() {
            return true;
        }
    }

    private static class Regular extends Delay {
        private final boolean global;
        private final ImmutableList<Long> intervals;

        Regular(long delay, boolean global, List<Long> intervals) {
            super(delay);
            this.global = global;
            checkArgument(Iterables.all(checkNotNull(intervals), new Predicate<Long>() {
                public boolean apply(Long input) {
                    return input != null && input.longValue() > 0;
                }
            }), "The intervals must be > 0");
            this.intervals = ImmutableList.copyOf(intervals);
        }

        @Override
        public ImmutableList<Long> getIntervals() {
            return intervals;
        }

        @Override
        public boolean isGlobal() {
            return global;
        }
    }

}