Package org.apache.tools.ant.filters

# Class ConcatFilter

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.ConcatFilter

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

public final class ConcatFilter extends BaseParamFilterReader implements ChainableReader
Concats a file before and/or after the file.

Example:

     <copy todir="build">
         <fileset dir="src" includes="*.java"/>
         <filterchain>
             <concatfilter prepend="apache-license-java.txt"/>
         </filterchain>
     </copy>

Copies all java sources from src to build and adds the content of apache-license-java.txt add the beginning of each file.

Since:
  1.6
Version:
  2003-09-23

## Field Summary

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

`in`

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

`lock`

## Constructor Summary

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

## Method Summary

Modifier and Type
Method
Description
`Reader`
`chain(Reader rdr)`
Creates a new ConcatReader using the passed in Reader for instantiation.
`File`
`getAppend()`
Returns append attribute.
`File`
`getPrepend()`
Returns prepend attribute.
`int`
`read()`
Returns the next character in the filtered stream.
`void`
`setAppend(File append)`
Sets append attribute.
`void`
`setPrepend(File prepend)`
Sets prepend attribute.

### 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

### ConcatFilter

public ConcatFilter()
Constructor for "dummy" instances.

See Also:
  - `BaseFilterReader()`

### ConcatFilter

public ConcatFilter(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. If the desired number of lines have already been read, the resulting stream is effectively at an end. Otherwise, the next character from the underlying stream is read and returned.

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

### setPrepend

public void setPrepend(File prepend)
Sets prepend attribute.

Parameters:
  `prepend` - new value

### getPrepend

public File getPrepend()
Returns prepend attribute.

Returns:
  prepend attribute

### setAppend

public void setAppend(File append)
Sets append attribute.

Parameters:
  `append` - new value

### getAppend

public File getAppend()
Returns append attribute.

Returns:
  append attribute

### chain

public Reader chain(Reader rdr)
Creates a new ConcatReader 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