org.apache.tools.ant.filters

## Class ReplaceTokens

- 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.ReplaceTokens

All Implemented Interfaces:
  java.io.Closeable, java.lang.AutoCloseable, java.lang.Readable, ChainableReader, Parameterizable

    public final class ReplaceTokens
    extends BaseParamFilterReader
    implements ChainableReader

Replaces tokens in the original input with user-supplied values. Example:

    <replacetokens begintoken="#" endtoken="#">
       <token key="DATE" value="${TODAY}"/>
     </replacetokens>

Or:

    <filterreader classname="org.apache.tools.ant.filters.ReplaceTokens">
       <param type="tokenchar" name="begintoken" value="#"/>
       <param type="tokenchar" name="endtoken" value="#"/>
       <param type="token" name="DATE" value="${TODAY}"/>
     </filterreader>

### Nested Class Summary

Nested Classes
`static class` `ReplaceTokens.Token` Holds a token

### Field Summary

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

`in`

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

`lock`

### Constructor Summary

Constructors
Constructor and Description
`ReplaceTokens()` Constructor for "dummy" instances.
`ReplaceTokens(java.io.Reader in)` Creates a new filtered reader.

### Method Summary

Methods
`void` `addConfiguredToken(ReplaceTokens.Token token)` Adds a token element to the map of tokens to replace.
`java.io.Reader` `chain(java.io.Reader rdr)` Creates a new ReplaceTokens using the passed in Reader for instantiation.
`int` `read()` Returns the next character in the filtered stream, replacing tokens from the original stream.
`void` `setBeginToken(char beginToken)` Sets the "begin token" character.
`void` `setEndToken(char endToken)` Sets the "end token" character.
`void` `setPropertiesResource(Resource r)` A resource containing properties, each of which is interpreted as a token/value pair.

### 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

#### ReplaceTokens

    public ReplaceTokens()

Constructor for "dummy" instances.

See Also:
  `BaseFilterReader.BaseFilterReader()`

#### ReplaceTokens

    public ReplaceTokens(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, replacing tokens from the original stream.

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

#### setBeginToken

    public void setBeginToken(char beginToken)

Sets the "begin token" character.

Parameters:
  `beginToken` - the character used to denote the beginning of a token

#### setEndToken

    public void setEndToken(char endToken)

Sets the "end token" character.

Parameters:
  `endToken` - the character used to denote the end of a token

#### setPropertiesResource

    public void setPropertiesResource(Resource r)

A resource containing properties, each of which is interpreted as a token/value pair.

Since:
  Ant 1.8.0

#### addConfiguredToken

    public void addConfiguredToken(ReplaceTokens.Token token)

Adds a token element to the map of tokens to replace.

Parameters:
  `token` - The token to add to the map of replacements. Must not be `null`.

#### chain

    public java.io.Reader chain(java.io.Reader rdr)

Creates a new ReplaceTokens 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