Class ProcessBuilder.Redirect

java.lang.Object
java.lang.ProcessBuilder.Redirect
Enclosing class:
ProcessBuilder
public abstract static classProcessBuilder.RedirectextendsObject
Represents a source of subprocess input or a destination ofsubprocess output.EachRedirect instance is one of the following:

Each of the above categories has an associated uniqueType.

Since:
1.7

  • Field Details

    • PIPE

      public static final ProcessBuilder.Redirect PIPE
      Indicates that subprocess I/O will be connected to thecurrent Java process over a pipe.This is the default handling of subprocess standard I/O.

      It will always be true that

          Redirect.PIPE.file() == null &&    Redirect.PIPE.type() == Redirect.Type.PIPE

    • INHERIT

      public static final ProcessBuilder.Redirect INHERIT
      Indicates that subprocess I/O source or destination will be thesame as those of the current process. This is the normalbehavior of most operating system command interpreters (shells).

      It will always be true that

          Redirect.INHERIT.file() == null &&    Redirect.INHERIT.type() == Redirect.Type.INHERIT

    • DISCARD

      public static final ProcessBuilder.Redirect DISCARD
      Indicates that subprocess output will be discarded.A typical implementation discards the output by writing toan operating system specific "null file".

      It will always be true that

          Redirect.DISCARD.file() != null && // is the filename appropriate for the operating system    Redirect.DISCARD.type() == Redirect.Type.WRITE;

      Since:
      9

  • Method Details

    • type

      public abstract ProcessBuilder.Redirect.Type type()
      Returns the type of thisRedirect.
      Returns:
      the type of thisRedirect

    • file

      public File file()
      Returns theFile source or destination associatedwith this redirect, ornull if there is no such file.
      Returns:
      the file associated with this redirect, ornull if there is no such file

    • from

      public static ProcessBuilder.Redirect from(File file)
      Returns a redirect to read from the specified file.

      It will always be true that

          Redirect.from(file).file() == file &&    Redirect.from(file).type() == Redirect.Type.READ

      Parameters:
      file - TheFile for theRedirect.
      Returns:
      a redirect to read from the specified file

    • to

      public static ProcessBuilder.Redirect to(File file)
      Returns a redirect to write to the specified file.If the specified file exists when the subprocess is started,its previous contents will be discarded.

      It will always be true that

          Redirect.to(file).file() == file &&    Redirect.to(file).type() == Redirect.Type.WRITE

      Parameters:
      file - TheFile for theRedirect.
      Returns:
      a redirect to write to the specified file

    • appendTo

      public static ProcessBuilder.Redirect appendTo(File file)
      Returns a redirect to append to the specified file.Each write operation first advances the position to theend of the file and then writes the requested data.Whether the advancement of the position and the writingof the data are done in a single atomic operation issystem-dependent and therefore unspecified.

      It will always be true that

          Redirect.appendTo(file).file() == file &&    Redirect.appendTo(file).type() == Redirect.Type.APPEND

      Parameters:
      file - TheFile for theRedirect.
      Returns:
      a redirect to append to the specified file

    • equals

      public boolean equals(Object obj)
      Compares the specified object with thisRedirect forequality. Returnstrue if and only if the twoobjects are identical or both objects areRedirectinstances of the same type associated with non-null equalFile instances.
      Overrides:
      equals in class Object
      Parameters:
      obj - the reference object with which to compare.
      Returns:
      true if this object is the same as the obj argument;false otherwise.
      See Also:

    • hashCode

      public int hashCode()
      Returns a hash code value for thisRedirect.
      Overrides:
      hashCode in class Object
      Returns:
      a hash code value for thisRedirect
      See Also: