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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.

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/*
 * Copyright (C) 2012 United States Government as represented by the Administrator of the
 * National Aeronautics and Space Administration.
 * All Rights Reserved.
 */

package gov.nasa.worldwind.data;

import gov.nasa.worldwind.avlist.AVList;

/**
 * @author Lado Garakanidze
 * @version $Id: DataRasterReaderFactory.java 1171 2013-02-11 21:45:02Z dcollins $
 */
public interface DataRasterReaderFactory
{
    /**
     * Search the list of available data raster readers for one that will read a specified data source. The
     * determination is based on both the data type and the data source reference; some readers may be able to open data
     * of the corresponding type but not as, for example, an InputStream or a URL.
     * 
     * The list of readers searched is determined by the DataRasterReaderFactory associated with the current {@link
     * gov.nasa.worldwind.Configuration}, as specified by the {@link gov.nasa.worldwind.avlist.AVKey#DATA_RASTER_READER_FACTORY_CLASS_NAME}.
     * If no factory is specified in the configuration, {@link gov.nasa.worldwind.data.BasicDataRasterReaderFactory} is
     * used.
     *
     * @param source the source to read. May by a {@link java.io.File}, a file path, a URL or an {@link
     *               java.io.InputStream}.
     * @param params optional metadata associated with the data source that might be useful in determining the data
     *               reader. TODO: How does the caller determine which parameters are necessary or useful?
     *
     * @return a data reader for the specified source, or null if no reader can be found.
     *
     * @throws IllegalArgumentException if the source is null.
     */
    public DataRasterReader findReaderFor(Object source, AVList params);

    /**
     * Search a specified list of data raster readers for one that will read a specified data source. The determination
     * is based on both the data type and the data source reference; some readers may be able to open data of the
     * corresponding type but not as, for example, an InputStream or a URL.
     *
     * @param source  the source to read. May by a {@link java.io.File}, a file path, a URL or an {@link
     *                java.io.InputStream}.
     * @param params  optional metadata associated with the data source that might be useful in determining the data
     *                reader.
     * @param readers the list of readers to search.
     *
     * @return a data reader for the specified source, or null if no reader can be found.
     *
     * @throws IllegalArgumentException if either the source or the reader list is null.
     */
    public DataRasterReader findReaderFor(Object source, AVList params, DataRasterReader[] readers);

    /**
     * Returns this class' list of readers.
     *
     * @return the list of readers.
     */
    DataRasterReader[] getReaders();
}