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:
  java.io.Closeable, java.lang.AutoCloseable, java.lang.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 and Description
`ConcatFilter()` Constructor for "dummy" instances.
`ConcatFilter(java.io.Reader in)` Creates a new filtered reader.

### Method Summary

All Methods Instance Methods Concrete Methods
`java.io.Reader` `chain(java.io.Reader rdr)` Creates a new ConcatReader using the passed in Reader for instantiation.
`java.io.File` `getAppend()` Returns append attribute.
`java.io.File` `getPrepend()` Returns prepend attribute.
`int` `read()` Returns the next character in the filtered stream.
`void` `setAppend(java.io.File append)` Sets append attribute.
`void` `setPrepend(java.io.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

`read, read`

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

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

### Constructor Detail

#### ConcatFilter

    public ConcatFilter()

Constructor for "dummy" instances.

See Also:
  `BaseFilterReader.BaseFilterReader()`

#### ConcatFilter

    public ConcatFilter(java.io.Reader in)

Creates a new filtered reader.

Parameters:
  `in` - A Reader object providing the underlying stream. Must not be `null`.

### Method Detail

#### read

    public int read()
             throws java.io.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 `java.io.FilterReader`
Returns:
  the next character in the resulting stream, or -1 if the end of the resulting stream has been reached
Throws:
  `java.io.IOException` - if the underlying stream throws an IOException during reading

#### setPrepend

    public void setPrepend(java.io.File prepend)

Sets prepend attribute.

Parameters:
  `prepend` - new value

#### getPrepend

    public java.io.File getPrepend()

Returns prepend attribute.

Returns:
  prepend attribute

#### setAppend

    public void setAppend(java.io.File append)

Sets append attribute.

Parameters:
  `append` - new value

#### getAppend

    public java.io.File getAppend()

Returns append attribute.

Returns:
  append attribute

#### chain

    public java.io.Reader chain(java.io.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