95 lines
2.5 KiB
Java
95 lines
2.5 KiB
Java
// files/Directories.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.*;
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import java.nio.file.*;
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import onjava.RmDir;
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public class Directories {
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static Path test = Paths.get("test");
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static String sep =
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FileSystems.getDefault().getSeparator();
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static List<String> parts =
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Arrays.asList("foo", "bar", "baz", "bag");
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static Path makeVariant() {
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Collections.rotate(parts, 1);
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return Paths.get("test", String.join(sep, parts));
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}
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static void refreshTestDir() throws Exception {
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if(Files.exists(test))
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RmDir.rmdir(test);
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if(!Files.exists(test))
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Files.createDirectory(test);
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}
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public static void
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main(String[] args) throws Exception {
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refreshTestDir();
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Files.createFile(test.resolve("Hello.txt"));
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Path variant = makeVariant();
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// Throws exception (too many levels):
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try {
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Files.createDirectory(variant);
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} catch(Exception e) {
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System.out.println("Nope, that doesn't work.");
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}
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populateTestDir();
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Path tempdir =
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Files.createTempDirectory(test, "DIR_");
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Files.createTempFile(tempdir, "pre", ".non");
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Files.newDirectoryStream(test)
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.forEach(System.out::println);
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System.out.println("*********");
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Files.walk(test).forEach(System.out::println);
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}
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static void populateTestDir() throws Exception {
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for(int i = 0; i < parts.size(); i++) {
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Path variant = makeVariant();
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if(!Files.exists(variant)) {
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Files.createDirectories(variant);
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Files.copy(Paths.get("Directories.java"),
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variant.resolve("File.txt"));
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Files.createTempFile(variant, null, null);
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}
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}
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}
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}
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/* Output:
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Nope, that doesn't work.
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test\bag
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test\bar
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test\baz
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test\DIR_5142667942049986036
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test\foo
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test\Hello.txt
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*********
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test
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test\bag
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test\bag\foo
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test\bag\foo\bar
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test\bag\foo\bar\baz
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test\bag\foo\bar\baz\8279660869874696036.tmp
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test\bag\foo\bar\baz\File.txt
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test\bar
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test\bar\baz
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test\bar\baz\bag
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test\bar\baz\bag\foo
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test\bar\baz\bag\foo\1274043134240426261.tmp
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test\bar\baz\bag\foo\File.txt
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test\baz
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test\baz\bag
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test\baz\bag\foo
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test\baz\bag\foo\bar
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test\baz\bag\foo\bar\6130572530014544105.tmp
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test\baz\bag\foo\bar\File.txt
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test\DIR_5142667942049986036
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test\DIR_5142667942049986036\pre7704286843227113253.non
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test\foo
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test\foo\bar
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test\foo\bar\baz
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test\foo\bar\baz\bag
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test\foo\bar\baz\bag\5412864507741775436.tmp
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test\foo\bar\baz\bag\File.txt
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test\Hello.txt
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*/
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