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8218875: Add new FileSystems.newFileSystem methods

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Reviewed-by: rriggs, alanb, clanger, dfuchs
This commit is contained in:
Lance Andersen 2019-05-02 17:08:03 -04:00
parent 2c35825433
commit 5a4cef05d6
10 changed files with 349 additions and 27 deletions
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142
src/java.base/share/classes/java/nio/file/FileSystems.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -365,14 +365,13 @@ public final class FileSystems {
* systems where the contents of one or more files is treated as a file
* system.
*
* <p> This method iterates over the {@link FileSystemProvider#installedProviders()
* installed} providers. It invokes, in turn, each provider's {@link
* FileSystemProvider#newFileSystem(Path,Map) newFileSystem(Path,Map)} method
* with an empty map. If a provider returns a file system then the iteration
* terminates and the file system is returned. If none of the installed
* providers return a {@code FileSystem} then an attempt is made to locate
* the provider using the given class loader. If a provider returns a file
* system then the lookup terminates and the file system is returned.
* <p> This method first attempts to locate an installed provider in exactly
* the same manner as the {@link #newFileSystem(Path, Map, ClassLoader)
* newFileSystem(Path, Map, ClassLoader)} method with an empty map. If none
* of the installed providers return a {@code FileSystem} then an attempt is
* made to locate the provider using the given class loader. If a provider
* returns a file system then the lookup terminates and the file system is
* returned.
*
* @param path
* the path to the file
@ -395,11 +394,132 @@ public final class FileSystems {
public static FileSystem newFileSystem(Path path,
ClassLoader loader)
throws IOException
{
return newFileSystem(path, Map.of(), loader);
}
/**
* Constructs a new {@code FileSystem} to access the contents of a file as a
* file system.
*
* <p> This method makes use of specialized providers that create pseudo file
* systems where the contents of one or more files is treated as a file
* system.
*
* <p> This method first attempts to locate an installed provider in exactly
* the same manner as the {@link #newFileSystem(Path,Map,ClassLoader)
* newFileSystem(Path, Map, ClassLoader)} method. If found, the provider's
* {@link FileSystemProvider#newFileSystem(Path, Map) newFileSystem(Path, Map)}
* method is invoked to construct the new file system.
*
* @param path
* the path to the file
* @param env
* a map of provider specific properties to configure the file system;
* may be empty
*
* @return a new file system
*
* @throws ProviderNotFoundException
* if a provider supporting this file type cannot be located
* @throws ServiceConfigurationError
* when an error occurs while loading a service provider
* @throws IOException
* if an I/O error occurs
* @throws SecurityException
* if a security manager is installed and it denies an unspecified
* permission
*
* @since 13
*/
public static FileSystem newFileSystem(Path path, Map<String,?> env)
throws IOException
{
return newFileSystem(path, env, null);
}
/**
* Constructs a new {@code FileSystem} to access the contents of a file as a
* file system.
*
* <p> This method makes use of specialized providers that create pseudo file
* systems where the contents of one or more files is treated as a file
* system.
*
* <p> This method first attempts to locate an installed provider in exactly
* the same manner as the {@link #newFileSystem(Path,Map,ClassLoader)
* newFileSystem(Path, Map, ClassLoader)} method. If found, the provider's
* {@link FileSystemProvider#newFileSystem(Path, Map) newFileSystem(Path, Map)}
* method is invoked with an empty map to construct the new file system.
*
* @param path
* the path to the file
*
* @return a new file system
*
* @throws ProviderNotFoundException
* if a provider supporting this file type cannot be located
* @throws ServiceConfigurationError
* when an error occurs while loading a service provider
* @throws IOException
* if an I/O error occurs
* @throws SecurityException
* if a security manager is installed and it denies an unspecified
* permission
*
* @since 13
*/
public static FileSystem newFileSystem(Path path) throws IOException {
return newFileSystem(path, Map.of(), null);
}
/**
* Constructs a new {@code FileSystem} to access the contents of a file as a
* file system.
*
* <p> This method makes use of specialized providers that create pseudo file
* systems where the contents of one or more files is treated as a file
* system.
*
* <p> This method iterates over the {@link FileSystemProvider#installedProviders()
* installed} providers. It invokes, in turn, each provider's {@link
* FileSystemProvider#newFileSystem(Path,Map) newFileSystem(Path,Map)}
* method. If a provider returns a file system then the iteration
* terminates and the file system is returned.
* If none of the installed providers return a {@code FileSystem} then
* an attempt is made to locate the provider using the given class loader.
* If a provider returns a file
* system, then the lookup terminates and the file system is returned.
*
* @param path
* the path to the file
* @param env
* a map of provider specific properties to configure the file system;
* may be empty
* @param loader
* the class loader to locate the provider or {@code null} to only
* attempt to locate an installed provider
*
* @return a new file system
*
* @throws ProviderNotFoundException
* if a provider supporting this file type cannot be located
* @throws ServiceConfigurationError
* when an error occurs while loading a service provider
* @throws IOException
* if an I/O error occurs
* @throws SecurityException
* if a security manager is installed and it denies an unspecified
* permission
*
* @since 13
*/
public static FileSystem newFileSystem(Path path, Map<String,?> env,
ClassLoader loader)
throws IOException
{
if (path == null)
throw new NullPointerException();
Map<String,?> env = Collections.emptyMap();
// check installed providers
for (FileSystemProvider provider: FileSystemProvider.installedProviders()) {
try {