org.apache.tools.ant.filters
Class ClassConstants

java.lang.Object
  java.io.Reader
      java.io.FilterReader
          org.apache.tools.ant.filters.BaseFilterReader
              org.apache.tools.ant.filters.ClassConstants

All Implemented Interfaces:

java.io.Closeable, java.lang.Readable, ChainableReader

public final class ClassConstants
extends BaseFilterReader
implements ChainableReader

Assembles the constants declared in a Java class in key1=value1(line separator)key2=value2 format.

Notes:

1. This filter uses the BCEL external toolkit.
2. This assembles only those constants that are not created using the syntax new whatever()
3. This assembles constants declared using the basic datatypes and String only.
4. The access modifiers of the declared constants do not matter.

Example:

<classconstants/>

Or:

<filterreader
    classname="org.apache.tools.ant.filters.ClassConstants"/>

Field Summary

Fields inherited from class java.io.FilterReader

in

Fields inherited from class java.io.Reader

lock

Constructor Summary

ClassConstants()
Constructor for "dummy" instances.

ClassConstants(java.io.Reader in)
Creates a new filtered reader.

Method Summary

java.io.Reader	chain(java.io.Reader rdr) Creates a new ClassConstants using the passed in Reader for instantiation.
int	read() Reads and assembles the constants declared in a class file.

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

ClassConstants

public ClassConstants()

Constructor for "dummy" instances.

See Also:

BaseFilterReader.BaseFilterReader()

ClassConstants

public ClassConstants(java.io.Reader in)

Creates a new filtered reader. The contents of the passed-in reader are expected to be the name of the class from which to produce a list of constants.

Parameters:

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

Method Detail

read

public int read()
         throws java.io.IOException

Reads and assembles the constants declared in a class file.

Overrides:

read in class java.io.FilterReader

Returns:

the next character in the list of constants, 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, or if the constants for the specified class cannot be read (for example due to the class not being found).

chain

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

Creates a new ClassConstants 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