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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 *
 *  * Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
 *  *
 *  *  Portions of this software were developed by the Unidata Program at the
 *  *  University Corporation for Atmospheric Research.
 *  *
 *  *  Access and use of this software shall impose the following obligations
 *  *  and understandings on the user. The user is granted the right, without
 *  *  any fee or cost, to use, copy, modify, alter, enhance and distribute
 *  *  this software, and any derivative works thereof, and its supporting
 *  *  documentation for any purpose whatsoever, provided that this entire
 *  *  notice appears in all copies of the software, derivative works and
 *  *  supporting documentation.  Further, UCAR requests that the user credit
 *  *  UCAR/Unidata in any publications that result from the use of this
 *  *  software or in any product that includes this software. The names UCAR
 *  *  and/or Unidata, however, may not be used in any advertising or publicity
 *  *  to endorse or promote any products or commercial entity unless specific
 *  *  written permission is obtained from UCAR/Unidata. The user also
 *  *  understands that UCAR/Unidata is not obligated to provide the user with
 *  *  any support, consulting, training or assistance of any kind with regard
 *  *  to the use, operation and performance of this software nor to provide
 *  *  the user with any updates, revisions, new versions or "bug fixes."
 *  *
 *  *  THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 *  *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  *  DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 *  *  INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 *  *  FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 *  *  NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 *  *  WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

package thredds.inventory.partition;

import thredds.featurecollection.FeatureCollectionConfig;
import thredds.filesystem.MFileOS7;
import thredds.inventory.*;
import ucar.nc2.util.CloseableIterator;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * Describe
 *
 * @author caron
 * @since 3/14/14
 */
public class PartitionManagerFromIndexDirectory extends CollectionAbstract implements PartitionManager {
  private List partIndexFiles;
  private final FeatureCollectionConfig config;

  public PartitionManagerFromIndexDirectory(String name, FeatureCollectionConfig config, File directory, org.slf4j.Logger logger) {
    super(name, logger);
    this.config = config;
    this.root = directory.getPath();
    this.partIndexFiles = new ArrayList<>();

    File[] files = directory.listFiles( new FilenameFilter() {
      public boolean accept(File dir, String name) { return name.endsWith(".ncx2"); }
    });
    if (files != null) {
      Collections.addAll(partIndexFiles, files);
    }

    this.putAuxInfo(FeatureCollectionConfig.AUX_CONFIG, config);

  }

  public Iterable makePartitions(CollectionUpdateType forceCollection) throws IOException {
    return new PartIterator();
  }

  private class PartIterator implements Iterator, Iterable {
    Iterator iter = partIndexFiles.iterator();

    @Override
    public Iterator iterator() {
      return this;
    }

    @Override
    public boolean hasNext() {
      return iter.hasNext();
    }

    @Override
    public MCollection next() {
      File nextFile = iter.next();

      try {
        MCollection result = new CollectionSingleIndexFile( new MFileOS7(nextFile.getPath()), logger);
        result.putAuxInfo(FeatureCollectionConfig.AUX_CONFIG, config);
        return result;

      } catch (IOException e) {
        logger.error("PartitionManagerFromList failed on "+nextFile.getPath(), e);
        throw new RuntimeException(e);
      }
    }

    @Override
    public void remove() {
    }
  }

  @Override
  public void close() { }

  @Override
  public boolean isLeaf() { return false; }

  @Override
  public Iterable getFilesSorted() throws IOException {
    return null;
  }

  @Override
  public CloseableIterator getFileIterator() throws IOException {
    return null;
  }
}