- java.lang.Object
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- javax.imageio.stream.ImageInputStreamImpl
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- javax.imageio.stream.ImageOutputStreamImpl
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- javax.imageio.stream.FileCacheImageOutputStream
 
 
 
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- All Implemented Interfaces:
- Closeable,- DataInput,- DataOutput,- AutoCloseable,- ImageInputStream,- ImageOutputStream
 
 public class FileCacheImageOutputStream extends ImageOutputStreamImpl An implementation ofImageOutputStreamthat writes its output to a regularOutputStream. A file is used to cache data until it is flushed to the output stream.
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Field Summary- 
Fields declared in class javax.imageio.stream.ImageInputStreamImplbitOffset, byteOrder, flushedPos, streamPos
 
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Constructor SummaryConstructors Constructor Description FileCacheImageOutputStream(OutputStream stream, File cacheDir)Constructs aFileCacheImageOutputStreamthat will write to a givenoutputStream.
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description voidclose()Closes thisFileCacheImageOutputStream.booleanisCached()Returnstruesince thisImageOutputStreamcaches data in order to allow seeking backwards.booleanisCachedFile()Returnstruesince thisImageOutputStreammaintains a file cache.booleanisCachedMemory()Returnsfalsesince thisImageOutputStreamdoes not maintain a main memory cache.voidseek(long pos)Sets the current stream position and resets the bit offset to 0.- 
Methods declared in class javax.imageio.stream.ImageOutputStreamImplflushBits
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Methods declared in class javax.imageio.stream.ImageInputStreamImplcheckClosed, finalize, length, mark, read, read, read, reset, skipBytes, skipBytes
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Methods declared in class java.lang.Objectclone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods declared in interface javax.imageio.stream.ImageInputStreamflush, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, length, mark, read, read, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, setBitOffset, setByteOrder, skipBytes, skipBytes
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Methods declared in interface javax.imageio.stream.ImageOutputStreamflushBefore, write, write, write, writeBit, writeBits, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeChars, writeDouble, writeDoubles, writeFloat, writeFloats, writeInt, writeInts, writeLong, writeLongs, writeShort, writeShorts, writeUTF
 
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Constructor Detail- 
FileCacheImageOutputStreampublic FileCacheImageOutputStream(OutputStream stream, File cacheDir) throws IOException Constructs aFileCacheImageOutputStreamthat will write to a givenoutputStream.A temporary file is used as a cache. If cacheDiris non-nulland is a directory, the file will be created there. If it isnull, the system-dependent default temporary-file directory will be used (see the documentation forFile.createTempFilefor details).- Parameters:
- stream- an- OutputStreamto write to.
- cacheDir- a- Fileindicating where the cache file should be created, or- nullto use the system directory.
- Throws:
- IllegalArgumentException- if- streamis- null.
- IllegalArgumentException- if- cacheDiris non-- nullbut is not a directory.
- IOException- if a cache file cannot be created.
 
 
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Method Detail- 
seekpublic void seek(long pos) throws IOExceptionSets the current stream position and resets the bit offset to 0. It is legal to seek past the end of the file; anEOFExceptionwill be thrown only if a read is performed. The file length will not be increased until a write is performed.- Parameters:
- pos- a- longcontaining the desired file pointer position.
- Throws:
- IndexOutOfBoundsException- if- posis smaller than the flushed position.
- IOException- if any other I/O error occurs.
 
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isCachedpublic boolean isCached() Returnstruesince thisImageOutputStreamcaches data in order to allow seeking backwards.- Specified by:
- isCachedin interface- ImageInputStream
- Overrides:
- isCachedin class- ImageInputStreamImpl
- Returns:
- true.
- See Also:
- isCachedMemory(),- isCachedFile()
 
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isCachedFilepublic boolean isCachedFile() Returnstruesince thisImageOutputStreammaintains a file cache.- Specified by:
- isCachedFilein interface- ImageInputStream
- Overrides:
- isCachedFilein class- ImageInputStreamImpl
- Returns:
- true.
- See Also:
- isCached(),- isCachedMemory()
 
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isCachedMemorypublic boolean isCachedMemory() Returnsfalsesince thisImageOutputStreamdoes not maintain a main memory cache.- Specified by:
- isCachedMemoryin interface- ImageInputStream
- Overrides:
- isCachedMemoryin class- ImageInputStreamImpl
- Returns:
- false.
- See Also:
- isCached(),- isCachedFile()
 
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closepublic void close() throws IOExceptionCloses thisFileCacheImageOutputStream. All pending data is flushed to the output, and the cache file is closed and removed. The destinationOutputStreamis not closed.- Throws:
- IOException- if an error occurs.
 
 
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