- java.lang.Object
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- java.io.Reader
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- java.io.FilterReader
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- All Implemented Interfaces:
- Closeable, AutoCloseable, Readable
- Direct Known Subclasses:
- PushbackReader
public abstract class FilterReader extends Reader
Abstract class for reading filtered character streams. The abstract classFilterReader
itself provides default methods that pass all requests to the contained stream. Subclasses ofFilterReader
should override some of these methods and may also provide additional methods and fields.- Since:
- JDK1.1
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-
Field Summary
Fields Modifier and Type Field and Description protected Reader
in
The underlying character-input stream.-
Fields inherited from class java.io.Reader
lock
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Constructor Summary
Constructors Modifier Constructor and Description protected
FilterReader(Reader in)
Creates a new filtered reader.
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Method Summary
Methods Modifier and Type Method and Description void
close()
Closes the stream and releases any system resources associated with it.void
mark(int readAheadLimit)
Marks the present position in the stream.boolean
markSupported()
Tells whether this stream supports the mark() operation.int
read()
Reads a single character.int
read(char[] cbuf, int off, int len)
Reads characters into a portion of an array.boolean
ready()
Tells whether this stream is ready to be read.void
reset()
Resets the stream.long
skip(long n)
Skips characters.
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-
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Field Detail
-
in
protected Reader in
The underlying character-input stream.
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Constructor Detail
-
FilterReader
protected FilterReader(Reader in)
Creates a new filtered reader.- Parameters:
in
- a Reader object providing the underlying stream.- Throws:
NullPointerException
- ifin
isnull
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Method Detail
-
read
public int read() throws IOException
Reads a single character.- Overrides:
read
in classReader
- Returns:
- The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached
- Throws:
IOException
- If an I/O error occurs
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read
public int read(char[] cbuf, int off, int len) throws IOException
Reads characters into a portion of an array.- Specified by:
read
in classReader
- Parameters:
cbuf
- Destination bufferoff
- Offset at which to start storing characterslen
- Maximum number of characters to read- Returns:
- The number of characters read, or -1 if the end of the stream has been reached
- Throws:
IOException
- If an I/O error occurs
-
skip
public long skip(long n) throws IOException
Skips characters.- Overrides:
skip
in classReader
- Parameters:
n
- The number of characters to skip- Returns:
- The number of characters actually skipped
- Throws:
IOException
- If an I/O error occurs
-
ready
public boolean ready() throws IOException
Tells whether this stream is ready to be read.- Overrides:
ready
in classReader
- Returns:
- True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
- Throws:
IOException
- If an I/O error occurs
-
markSupported
public boolean markSupported()
Tells whether this stream supports the mark() operation.- Overrides:
markSupported
in classReader
- Returns:
- true if and only if this stream supports the mark operation.
-
mark
public void mark(int readAheadLimit) throws IOException
Marks the present position in the stream.- Overrides:
mark
in classReader
- Parameters:
readAheadLimit
- Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.- Throws:
IOException
- If an I/O error occurs
-
reset
public void reset() throws IOException
Resets the stream.- Overrides:
reset
in classReader
- Throws:
IOException
- If an I/O error occurs
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close
public void close() throws IOException
Description copied from class:Reader
Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.- Specified by:
close
in interfaceCloseable
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in classReader
- Throws:
IOException
- If an I/O error occurs
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