Package org.apache.tools.ant.filters

# Class StripLineComments

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.StripLineComments

All Implemented Interfaces:
  `Closeable`, `AutoCloseable`, `Readable`, `ChainableReader`, `Parameterizable`

public final class StripLineComments extends BaseParamFilterReader implements ChainableReader
This filter strips line comments. Example:

    <striplinecomments>
       <comment value="#"/>
       <comment value="--"/>
       <comment value="REM "/>
       <comment value="rem "/>
       <comment value="//"/>
     </striplinecomments>

Or:

    <filterreader
          classname="org.apache.tools.ant.filters.StripLineComments">
       <param type="comment" value="#"/>
       <param type="comment" value="--"/>
       <param type="comment" value="REM "/>
       <param type="comment" value="rem "/>
       <param type="comment" value="//"/>
     </filterreader>

## Nested Class Summary

Nested Classes
Modifier and Type
Class
Description
`static class`
`StripLineComments.Comment`
The class that holds a comment representation.

## Field Summary

### Fields inherited from class java.io.FilterReader

`in`

### Fields inherited from class java.io.Reader

`lock`

## Constructor Summary

Constructors
Constructor
Description
`StripLineComments()`
Constructor for "dummy" instances.
`StripLineComments(Reader in)`
Creates a new filtered reader.

## Method Summary

Modifier and Type
Method
Description
`void`
`addConfiguredComment(StripLineComments.Comment comment)`
Adds a `comment` element to the list of prefixes.
`Reader`
`chain(Reader rdr)`
Creates a new StripLineComments using the passed in Reader for instantiation.
`int`
`read()`
Returns the next character in the filtered stream, only including lines from the original stream which don't start with any of the specified comment prefixes.

### Methods inherited from class org.apache.tools.ant.filters.BaseParamFilterReader

`getParameters, setParameters`

### Methods inherited from class org.apache.tools.ant.filters.BaseFilterReader

`getInitialized, getProject, read, readFully, readLine, setInitialized, setProject, skip`

### Methods inherited from class java.io.FilterReader

`close, mark, markSupported, ready, reset`

### Methods inherited from class java.io.Reader

`nullReader, read, read, transferTo`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

## Constructor Details

### StripLineComments

public StripLineComments()
Constructor for "dummy" instances.

See Also:
  - `BaseFilterReader()`

### StripLineComments

public StripLineComments(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, only including lines from the original stream which don't start with any of the specified comment prefixes.

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

### addConfiguredComment

public void addConfiguredComment(StripLineComments.Comment comment)
Adds a `comment` element to the list of prefixes.

Parameters:
  `comment` - The `comment` element to add to the list of comment prefixes to strip. Must not be `null`.

### chain

public Reader chain(Reader rdr)
Creates a new StripLineComments 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