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Update SuFile javadoc

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topjohnwu 2021-02-02 03:15:18 -08:00
parent 59cab9eb84
commit f4ed567285
1 changed files with 19 additions and 28 deletions
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47
io/src/main/java/com/topjohnwu/superuser/io/SuFile.java
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@ -37,26 +37,24 @@ import java.util.Locale;
/**
* A {@link File} implementation using root shell.
* <p>
* All methods for this class will be backed by executing commands via the global root shell.
* The {@code Shell} instance will be acquired via {@link Shell#getShell()}.
* All methods of this class are implemented by executing commands via the main shell.
* <p>
* This class has the exact same behavior as a normal {@link File}, however none of the operations
* are atomic. This is a limitation of using shells, be aware of it.
* This class has the same behavior as a normal {@link File}, however none of the operations
* are atomic. This is a limitation for using shell commands.
* <p>
* For full functionality, the environment require: {@code rm}, {@code rmdir}, {@code readlink},
* {@code mv}, {@code ls}, {@code mkdir}, {@code touch}, and {@code stat}.
* These tools are available on modern Android versions with toybox, however for consistent
* results, using {@code busybox} would be desirable. Some operations could have oddities
* without busybox due to the lack of tools or slightly different behavior,
* check each individual method descriptions for more details.
* Each method description in this class will list out its required commands.
* The following commands exists on all Android versions: {@code rm}, {@code rmdir},
* {@code mv}, {@code ls}, and {@code mkdir}.
* The following commands require {@code toybox} on Android 6.0 and higher, or {@code busybox}
* to support legacy devices: {@code readlink}, {@code touch}, and {@code stat}.
* <p>
* There are also handy factory methods {@code SuFile.open(...)} for obtaining {@link File}
* instances. These factory methods will return a normal {@link File} instance if the underlying
* shell does not have root access, or else returns a {@link SuFile} instance.
* This class has handy factory methods {@code SuFile.open(...)} for obtaining {@link File}
* instances. These factory methods will return a normal {@link File} instance if the main
* shell does not have root access, or else return a {@link SuFile} instance.
*/
public class SuFile extends File {
private String[] CMDs;
private final String[] CMDs;
public static File open(String pathname) {
return Shell.rootAccess() ? new SuFile(pathname) : new File(pathname);
@ -124,16 +122,9 @@ public class SuFile extends File {
return cmdBool("[ -w \"$__F_\" ]");
}
/**
* Creates a new, empty file named by this abstract pathname if
* and only if a file with this name does not yet exist.
* <p>
* Requires command {@code touch}.
* @see File#createNewFile()
*/
@Override
public boolean createNewFile() {
return cmdBool("[ ! -e \"$__F_\" ] && touch \"$__F_\"");
return cmdBool("[ ! -e \"$__F_\" ] && echo -n > \"$__F_\"");
}
/**
@ -141,7 +132,7 @@ public class SuFile extends File {
* this pathname denotes a directory, then the directory must be empty in
* order to be deleted.
* <p>
* Requires command {@code rm}, or {@code rmdir} for directories.
* Requires command {@code rm} for files, and {@code rmdir} for directories.
* @see File#delete()
*/
@Override
@ -163,8 +154,8 @@ public class SuFile extends File {
/**
* Clear the content of the file denoted by this abstract pathname.
* Creates a new file is it does not already exist.
* @return true if operation succeed
* Creates a new file if it does not already exist.
* @return true if the operation succeeded
*/
public boolean clear() {
return cmdBool("echo -n > \"$__F_\"");
@ -175,7 +166,7 @@ public class SuFile extends File {
*/
@Override
public void deleteOnExit() {
throw new UnsupportedOperationException("Unsupported operation in shell backed File");
throw new UnsupportedOperationException("Unsupported SuFile operation");
}
@Override
@ -315,7 +306,7 @@ public class SuFile extends File {
/**
* Returns the length of the file denoted by this abstract pathname.
* <p>
* Requires either command {@code stat} or {@code wc}.
* Requires command {@code stat}.
* @see File#length()
*/
@Override
@ -427,7 +418,7 @@ public class SuFile extends File {
/**
* Sets the last-modified time of the file or directory named by this abstract pathname.
* <p>
* Note: On older Android devices, the {@code touch} command accepts a different timestamp
* Note: On Android 5.1 and lower, the {@code touch} command accepts a different timestamp
* format than GNU {@code touch}. This implementation uses the format accepted in GNU
* coreutils, which is the same format accepted by toybox and busybox, so this operation
* may fail on older Android versions without busybox.