com.oculusinfo.binning.io.impl.ZipResourcePyramidSource.java Source code

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Here is the source code for com.oculusinfo.binning.io.impl.ZipResourcePyramidSource.java

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/*
 * Copyright (c) 2014 Oculus Info Inc.
 * http://www.oculusinfo.com/
 *
 * Released under the MIT License.
 *
 * 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 com.oculusinfo.binning.io.impl;

import com.oculusinfo.binning.TileIndex;
import com.oculusinfo.binning.io.PyramidIO;
import com.oculusinfo.binning.io.PyramidIOFactory;
import com.oculusinfo.factory.util.Pair;

import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * Extends the PyramidSource abstract class for zip based tiles.
 *  
 */
public class ZipResourcePyramidSource extends PyramidSourceStream {

    private final Logger LOGGER = LoggerFactory.getLogger(getClass());

    private ZipFile _tileSetArchive;
    private String _tileExtension;

    // We meed a global cache of zip stream sources - zip files are very slow to
    // read, so the source is slow to initialize, so creating a new one each
    // time we run isn't feasible.
    private static Map<Pair<String, String>, ZipResourcePyramidSource> _zipfileCache = new HashMap<>();

    static ZipResourcePyramidSource getZipSource(String rootpath, String extension) {
        Pair<String, String> key = new Pair<>(rootpath, extension);
        if (!_zipfileCache.containsKey(key)) {
            synchronized (_zipfileCache) {
                if (!_zipfileCache.containsKey(key)) {
                    if (rootpath.startsWith("file://")) {
                        rootpath = rootpath.substring(7);
                    } else if (rootpath.startsWith("res://")) {
                        rootpath = rootpath.substring(6);
                        URL zipFile = PyramidIOFactory.class.getResource(rootpath);
                        rootpath = zipFile.getFile();
                    }

                    ZipResourcePyramidSource source = new ZipResourcePyramidSource(rootpath, extension);
                    _zipfileCache.put(key, source);
                }
            }
        }
        return _zipfileCache.get(key);
    }

    public ZipResourcePyramidSource(String zipFilePath, String tileExtension) {
        try {
            _tileSetArchive = new ZipFile(zipFilePath);
            _tileExtension = tileExtension;
        } catch (IOException e) {
            LOGGER.warn("Could not create zip file for " + zipFilePath, e);
        }
    }

    @Override
    protected InputStream getSourceTileStream(String basePath, TileIndex tile) throws IOException {
        String tileLocation = String.format("%s/" + PyramidIO.TILES_FOLDERNAME + "/%d/%d/%d." + _tileExtension,
                basePath, tile.getLevel(), tile.getX(), tile.getY());
        ZipArchiveEntry entry = _tileSetArchive.getEntry(tileLocation);
        return _tileSetArchive.getInputStream(entry);
    }

    @Override
    protected InputStream getSourceMetaDataStream(String basePath) throws IOException {
        String location = basePath + "/" + PyramidIO.METADATA_FILENAME;
        ZipArchiveEntry entry = _tileSetArchive.getEntry(location);
        return _tileSetArchive.getInputStream(entry);
    }
}