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:
- This filter uses the BCEL external toolkit.
- This assembles only those constants that are not created
using the syntax
new whatever()
- This assembles constants declared using the basic datatypes
and String only.
- The access modifiers of the declared constants do not matter.
Example:
<classconstants/>
Or:
<filterreader
classname="org.apache.tools.ant.filters.ClassConstants"/>
Fields inherited from class java.io.FilterReader |
in |
Fields inherited from class java.io.Reader |
lock |
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 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 |
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
.
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