Package groovy.util

Class IndentPrinter

java.lang.Object
groovy.util.IndentPrinter
public class IndentPrinter
extends Object
A helper class for printing indented text. This can be used stand-alone or, more commonly, from Builders.

By default, a PrintWriter to System.out is used as the Writer, but it is possible to change the Writer by passing a new one as a constructor argument.

Indention by default is 2 characters but can be changed by passing a different value as a constructor argument.

The following is an example usage. Note that within a "with" block you need to specify a parameter name so that this.println is not called instead of IndentPrinter.println: 

 new IndentPrinter(new PrintWriter(out)).with { p ->
     p.printIndent()
     p.println('parent1')
     p.incrementIndent()
     p.printIndent()
     p.println('child 1')
     p.printIndent()
     p.println('child 2')
     p.decrementIndent()
     p.printIndent()
     p.println('parent2')
     p.flush()
 }
The above example prints this to standard output: 
 parent1
   child 1
   child 2
 parent2

  • Constructor Details

    • IndentPrinter

      public IndentPrinter()
      Creates an IndentPrinter backed by a PrintWriter pointing to System.out, with an indent of two spaces.
      See Also:
      IndentPrinter(Writer, String)

    • IndentPrinter

      public IndentPrinter​(Writer out)
      Creates an IndentPrinter backed by the supplied Writer, with an indent of two spaces.
      Parameters:
      out - Writer to output to
      See Also:
      IndentPrinter(Writer, String)

    • IndentPrinter

      public IndentPrinter​(Writer out, String indent)
      Creates an IndentPrinter backed by the supplied Writer, with a user-supplied String to be used for indenting.
      Parameters:
      out - Writer to output to
      indent - character(s) used to indent each line

    • IndentPrinter

      public IndentPrinter​(Writer out, String indent, boolean addNewlines)
      Creates an IndentPrinter backed by the supplied Writer, with a user-supplied String to be used for indenting and the ability to override newline handling.
      Parameters:
      out - Writer to output to
      indent - character(s) used to indent each line
      addNewlines - set to false to gobble all new lines (default true)

    • IndentPrinter

      public IndentPrinter​(Writer out, String indent, boolean addNewlines, boolean autoIndent)
      Create an IndentPrinter to the given PrintWriter
      Parameters:
      out - Writer to output to
      indent - character(s) used to indent each line
      addNewlines - set to false to gobble all new lines (default true)
      autoIndent - set to true to make println() prepend the indent automatically (default false)

  • Method Details

    • println

      public void println​(String text)
      Prints a string followed by an end of line character.
      Parameters:
      text - String to be written

    • print

      public void print​(String text)
      Prints a string.
      Parameters:
      text - String to be written

    • print

      public void print​(char c)
      Prints a character.
      Parameters:
      c - char to be written

    • printIndent

      public void printIndent()
      Prints the current indent level.

    • println

      public void println()
      Prints an end-of-line character (if enabled via addNewLines property). Defaults to outputting a single '\n' character but by using a custom Writer, e.g. PlatformLineWriter, you can get platform-specific end-of-line characters.
      See Also:
      IndentPrinter(Writer, String, boolean)

    • incrementIndent

      public void incrementIndent()

    • decrementIndent

      public void decrementIndent()

    • getIndentLevel

      public int getIndentLevel()

    • setIndentLevel

      public void setIndentLevel​(int indentLevel)

    • getAutoIndent

      public boolean getAutoIndent()

    • setAutoIndent

      public void setAutoIndent​(boolean autoIndent)

    • flush

      public void flush()