com.lyndir.lhunath.snaplog.data.object.media.aws.S3MediaData.java Source code

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Here is the source code for com.lyndir.lhunath.snaplog.data.object.media.aws.S3MediaData.java

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/*
 *   Copyright 2010, Maarten Billemont
 *
 *   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 com.lyndir.lhunath.snaplog.data.object.media.aws;

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

import com.google.common.collect.Maps;
import com.lyndir.lhunath.snaplog.data.object.media.Media;
import com.lyndir.lhunath.snaplog.data.object.media.Media.Quality;
import com.lyndir.lhunath.snaplog.data.object.media.MediaData;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;
import org.jets3t.service.model.S3Object;

/**
 * <h2>{@link S3MediaData}<br> <sub>[in short] (TODO).</sub></h2>
 *
 * <p> <i>Mar 6, 2010</i> </p>
 *
 * @author lhunath
 */
public class S3MediaData implements MediaData<S3Media> {

    private final S3Media media;
    private final Map<Quality, S3Object> s3Objects;

    /**
     * Create a new {@link S3MediaData} instance.
     *
     * @param media The {@link S3Media} that we hold data for.
     */
    public S3MediaData(final S3Media media) {

        checkNotNull(media, "Given media must not be null.");

        this.media = media;

        s3Objects = Maps.newHashMapWithExpectedSize(Quality.values().length);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public S3Media getMedia() {

        return media;
    }

    @Override
    public void purge() {

        s3Objects.clear();
    }

    /**
     * Record an {@link S3Object} for a given {@link Quality} of the {@link Media} we hold data for.
     *
     * @param quality  The quality of the media that the given s3Object represents.
     * @param s3Object The S3 data of the media at the given quality.
     *
     * @return <code>this</code> for chaining.
     */
    public MediaData<S3Media> put(final Quality quality, final S3Object s3Object) {

        checkNotNull(quality, "Given quality must not be null.");
        checkNotNull(s3Object, "Given S3 object must not be null.");

        s3Objects.put(quality, s3Object);

        return this;
    }

    /**
     * Retrieve the s3Object for the {@link Media} we hold data for at the given quality.
     *
     * @param quality The {@link Quality} at which we want data.
     *
     * @return An S3 data object.
     */
    public S3Object get(final Quality quality) {

        checkNotNull(quality, "Given quality must not be null.");

        return s3Objects.get(quality);
    }

    @Override
    public String toString() {

        Set<Quality> s3ObjectKeys = EnumSet.noneOf(Quality.class);
        for (final Map.Entry<Quality, S3Object> entry : s3Objects.entrySet())
            if (entry.getValue() != null)
                s3ObjectKeys.add(entry.getKey());

        return String.format("{s3MediaData: media=%s, cached=%s}", media, s3ObjectKeys);
    }
}