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This is the parser library for the PDS4 planetary data standard.

There is a newer version: 2.8.4

// Copyright 2019, California Institute of Technology ("Caltech").
// U.S. Government sponsorship acknowledged.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions must reproduce the above copyright notice, this list of
// conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
// * Neither the name of Caltech nor its operating division, the Jet Propulsion
// Laboratory, nor the names of its contributors may be used to endorse or
// promote products derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package gov.nasa.pds.objectAccess;

import java.io.FileReader;

/**  Utility class for managing files. */
class ArchiveLocator {

	static final String SEP = System.getProperty("file.separator");

	public static String resolveDataItemLocation(String root, String relativeFilename) throws Exception {
		String srFile = root + "/"+ relativeFilename;
		String fn = srFile.replace('\\', SEP.charAt(0));
		return verifyFileExistsOnPlatform(fn);
	}

	public static String getSubpath(String relativeFilename) throws Exception {
		String normalizedFn = relativeFilename.replace('\\', SEP.charAt(0));
		int idx = normalizedFn.lastIndexOf(SEP.charAt(0));
		return idx < 0 ? null : relativeFilename.substring(0, idx);
	}

	public static String verifyFileExistsOnPlatform(String fname) throws Exception {
		try {
			new FileReader(fname);
		} catch (Exception e) {
			System.out.println("File does not exist: " + fname);
			 throw new Exception(e); //FileNotFoundException would need to be serialized
		}
		return fname;
	}

}