/*
 
* Copyright (c) 2016 Metron, Inc.
 
* All rights reserved.
 
*
 
* Redistribution and use in source and binary forms, with or without
 
* modification, are permitted provided that the following conditions are met:
 
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* Redistributions of source code must retain the above copyright
 
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notice, this list of conditions and the following disclaimer.
 
*
     
* Redistributions in binary form 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 Metron, Inc. 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
 
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package com.metsci.glimpse.charts.slippy;

import java.nio.file.Path;
import java.nio.file.Paths;

import com.metsci.glimpse.util.GlimpseDataPaths;

public class SlippyDataPaths
{

    
private SlippyDataPaths( )
    
{
    
}

    
/**
     
* Standard dir for slippy tile cache. Contains a folder for each tile source.
     
* <ol>
     
* <li>JVM prop (if defined): {@code glimpse.slippy.cacheDir}
     
* <li>Env var (if defined): {@code GLIMPSE_SLIPPY_CACHE}
     
* <li>Default: subdir slippy-cache of {@link GlimpseDataPaths#glimpseUserCacheDir}
     
* </ol>
     
*/

    
public static final Path slippyCacheRoot = slippyCacheRootDir( );
    
private static Path slippyCacheRootDir( )
    
{
        
String jvmProp = System.getProperty( "glimpse.slippy.cacheDir" );
        
if ( jvmProp != null )
        
{
            
return Paths.get( jvmProp );
        
}

        
String envVar = System.getenv( "GLIMPSE_SLIPPY_CACHE" );
        
if ( envVar != null )
        
{
            
return Paths.get( envVar );
        
}
        
Path parent = GlimpseDataPaths.glimpseUserCacheDir.toPath( );
        
return parent.resolve("slippy-cache");
    
}
}