Package org.apache.tools.ant.filters
Class ClassConstants
- java.lang.Object
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- java.io.Reader
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- java.io.FilterReader
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- org.apache.tools.ant.filters.BaseFilterReader
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- org.apache.tools.ant.filters.ClassConstants
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
,java.lang.Readable
,ChainableReader
public final class ClassConstants extends BaseFilterReader implements ChainableReader
Assembles the constants declared in a Java class inkey1=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"/>
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Constructor Summary
Constructors Constructor Description ClassConstants()
Constructor for "dummy" instances.ClassConstants(java.io.Reader in)
Creates a new filtered reader.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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
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Constructor Detail
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ClassConstants
public ClassConstants()
Constructor for "dummy" instances.- See Also:
BaseFilterReader()
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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 benull
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Method Detail
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read
public int read() throws java.io.IOException
Reads and assembles the constants declared in a class file.- Overrides:
read
in classjava.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).
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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 interfaceChainableReader
- Parameters:
rdr
- A Reader object providing the underlying stream. Must not benull
.- Returns:
- a new filter based on this configuration, but filtering the specified reader
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