Package org.apache.tools.ant.filters

Class PrefixLines

java.lang.Object
java.io.Reader
java.io.FilterReader
org.apache.tools.ant.filters.BaseFilterReader
org.apache.tools.ant.filters.BaseParamFilterReader
org.apache.tools.ant.filters.PrefixLines
All Implemented Interfaces:
Closeable, AutoCloseable, Readable, ChainableReader, Parameterizable
public final class PrefixLines extends BaseParamFilterReader implements ChainableReader
Attaches a prefix to every line. Example: 
<prefixlines prefix="Foo"/>
Or: 
<filterreader classname="org.apache.tools.ant.filters.PrefixLines">
  <param name="prefix" value="Foo"/>
 </filterreader>

  • Constructor Details

    • PrefixLines

      public PrefixLines()
      Constructor for "dummy" instances.
      See Also:

    • PrefixLines

      public PrefixLines(Reader in)
      Creates a new filtered reader.
      Parameters:
      in - A Reader object providing the underlying stream. Must not be null.

  • Method Details

    • read

      public int read() throws IOException
      Returns the next character in the filtered stream. One line is read from the original input, and the prefix added. The resulting line is then used until it ends, at which point the next original line is read, etc.
      Overrides:
      read in class FilterReader
      Returns:
      the next character in the resulting stream, or -1 if the end of the resulting stream has been reached
      Throws:
      IOException - if the underlying stream throws an IOException during reading

    • setPrefix

      public void setPrefix(String prefix)
      Sets the prefix to add at the start of each input line.
      Parameters:
      prefix - The prefix to add at the start of each input line. May be null, in which case no prefix is added.

    • chain

      public Reader chain(Reader rdr)
      Creates a new PrefixLines filter using the passed in Reader for instantiation.
      Specified by:
      chain in interface ChainableReader
      Parameters:
      rdr - A Reader object providing the underlying stream. Must not be null.
      Returns:
      a new filter based on this configuration, but filtering the specified reader