Package org.eclipse.birt.core.archive
Class RAFileInputStream
- java.lang.Object
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- java.io.InputStream
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- org.eclipse.birt.core.archive.RAInputStream
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- org.eclipse.birt.core.archive.RAFileInputStream
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- All Implemented Interfaces:
java.io.Closeable,java.lang.AutoCloseable
public class RAFileInputStream extends RAInputStream
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Constructor Summary
Constructors Constructor Description RAFileInputStream(java.io.RandomAccessFile parentFile, long startPos, long endPos)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description intavailable()Returns the number of bytes that can be read (or skipped over) from this random access input stream without blocking by the next caller of a method for this input stream.longgetOffset()longgetStreamLength()longlength()intread()The same behavior as InputStream.read().
Reads the next byte of data from the input stream.intread(byte[] b, int off, int len)The same behavior as InputStream.read(byte b[], int off, int len ).
Reads up to len bytes of data from the input stream into an array of bytes.voidreadFully(byte[] b, int off, int len)The same behavior as RandomAccessFile.readFully(byte b[], int off, int len) Reads exactlylenbytes from this file into the byte array, starting at the current file pointer.intreadInt()The same behavior as RandomAccessFile.readInt().longreadLong()Reads a signed 64-bit integer from this file.voidrefresh()voidseek(long localPos)Move the file pointer to the new location in the stream
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Constructor Detail
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RAFileInputStream
public RAFileInputStream(java.io.RandomAccessFile parentFile, long startPos, long endPos)- Parameters:
parentFile- - underlying RandomAccess filestartPos- - the (global) position of the first character in parentFileendPos- - the (global) position of EOF mark (not a valid character in the file)
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Method Detail
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refresh
public void refresh() throws java.io.IOException- Specified by:
refreshin classRAInputStream- Throws:
java.io.IOException
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read
public int read() throws java.io.IOExceptionThe same behavior as InputStream.read().
Reads the next byte of data from the input stream. The value byte is returned as anintin the range0to255. If no byte is available because the end of the stream has been reached, the value-1is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.A subclass must provide an implementation of this method.
- Specified by:
readin classjava.io.InputStream- Returns:
- the next byte of data, or
-1if the end of the stream is reached. - Throws:
java.io.IOException- if an I/O error occurs.
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read
public int read(byte[] b, int off, int len) throws java.io.IOExceptionThe same behavior as InputStream.read(byte b[], int off, int len ).
Reads up to len bytes of data from the input stream into an array of bytes. If no byte is available because the end of the stream has been reached, the value-1is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.A subclass must provide an implementation of this method.
- Overrides:
readin classjava.io.InputStream- Returns:
- the total number of bytes read into the buffer, or
-1if there is no more data because the end of the stream has been reached - Throws:
java.io.IOException- if an I/O error occurs.
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readInt
public int readInt() throws java.io.IOExceptionThe same behavior as RandomAccessFile.readInt().
Reads a signed 32-bit integer from this file. This method reads 4 bytes from the file, starting at the current file pointer. If the bytes read, in order, areb1,b2,b3, andb4, where0 <= b1, b2, b3, b4 <= 255, then the result is equal to:(b1 << 24) | (b2 << 16) + (b3 << 8) + b4
This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
- Specified by:
readIntin classRAInputStream- Returns:
- the next four bytes of this stream, interpreted as an
int. - Throws:
java.io.EOFException- if this stream reaches the end before reading four bytes.java.io.IOException- if an I/O error occurs.
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readLong
public final long readLong() throws java.io.IOExceptionReads a signed 64-bit integer from this file. This method reads eight bytes from the file, starting at the current file pointer. If the bytes read, in order, areb1,b2,b3,b4,b5,b6,b7, andb8,where:0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255,then the result is equal to:
((long) b1 << 56) + ((long) b2 << 48) + ((long) b3 << 40) + ((long) b4 << 32) + ((long) b5 << 24) + ((long) b6 << 16) + ((long) b7 << 8) + b8This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
- Specified by:
readLongin classRAInputStream- Returns:
- the next eight bytes of this file, interpreted as a
long. - Throws:
java.io.EOFException- if this file reaches the end before reading eight bytes.java.io.IOException- if an I/O error occurs.
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readFully
public final void readFully(byte[] b, int off, int len) throws java.io.IOExceptionThe same behavior as RandomAccessFile.readFully(byte b[], int off, int len) Reads exactlylenbytes from this file into the byte array, starting at the current file pointer. This method reads repeatedly from the file until the requested number of bytes are read. This method blocks until the requested number of bytes are read, the end of the stream is detected, or an exception is thrown.- Specified by:
readFullyin classRAInputStream- Parameters:
b- the buffer into which the data is read.off- the start offset of the data.len- the number of bytes to read.- Throws:
java.io.EOFException- if this file reaches the end before reading all the bytes.java.io.IOException- if an I/O error occurs.
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getStreamLength
public long getStreamLength()
- Returns:
- the length of the stream
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seek
public void seek(long localPos) throws java.io.IOExceptionMove the file pointer to the new location in the stream- Specified by:
seekin classRAInputStream- Parameters:
localPos- - the new local postion in the stream. The localPos starts from 0.- Throws:
java.io.IOException
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getOffset
public long getOffset() throws java.io.IOException- Specified by:
getOffsetin classRAInputStream- Throws:
java.io.IOException
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length
public long length() throws java.io.IOException- Specified by:
lengthin classRAInputStream- Throws:
java.io.IOException
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available
public int available() throws java.io.IOExceptionDescription copied from class:RAInputStreamReturns the number of bytes that can be read (or skipped over) from this random access input stream without blocking by the next caller of a method for this input stream. The next caller might be the same thread or another thread.This abstract class is extended by
RAFolderInputStreamandRAFileInputStreamThe
availablemethod returns-1when no more data because the end of the stream has been reached.and returns
Integer.MAX_VALUEwhen bytes of data is larger then Integer.MAX_VALUE.- Specified by:
availablein classRAInputStream- Throws:
java.io.IOException
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