java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
javax.imageio.stream.FileImageInputStream
- All Implemented Interfaces:
- Closeable,- DataInput,- AutoCloseable,- ImageInputStream
An implementation of 
ImageInputStream that gets its
 input from a File or RandomAccessFile.
 The file contents are assumed to be stable during the lifetime of
 the object.- 
Field SummaryFields declared in class javax.imageio.stream.ImageInputStreamImplbitOffset, byteOrder, flushedPos, streamPos
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Constructor SummaryConstructorsConstructorDescriptionConstructs aFileImageInputStreamthat will read from a givenFile.Constructs aFileImageInputStreamthat will read from a givenRandomAccessFile.
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Method SummaryModifier and TypeMethodDescriptionprotected voidfinalize()Deprecated, for removal: This API element is subject to removal in a future version.Finalization has been deprecated for removal.longlength()Returns the length of the underlying file, or-1if it is unknown.intread()Reads a single byte from the stream and returns it as anintbetween 0 and 255.intread(byte[] b, int off, int len) Reads up tolenbytes from the stream, and stores them intobstarting at indexoff.Methods declared in class javax.imageio.stream.ImageInputStreamImplcheckClosed, close, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, mark, 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, seek, setBitOffset, setByteOrder, skipBytes, skipBytes
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Constructor Details- 
FileImageInputStreamConstructs aFileImageInputStreamthat will read from a givenFile.The file contents must not change between the time this object is constructed and the time of the last call to a read method. - Parameters:
- f- a- Fileto read from.
- Throws:
- IllegalArgumentException- if- fis- null.
- SecurityException- if a security manager exists and does not allow read access to the file.
- FileNotFoundException- if- fis a directory or cannot be opened for reading for any other reason.
- IOException- if an I/O error occurs.
 
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FileImageInputStreamConstructs aFileImageInputStreamthat will read from a givenRandomAccessFile.The file contents must not change between the time this object is constructed and the time of the last call to a read method. - Parameters:
- raf- a- RandomAccessFileto read from.
- Throws:
- IllegalArgumentException- if- rafis- null.
 
 
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Method Details- 
readDescription copied from class:ImageInputStreamImplReads a single byte from the stream and returns it as anintbetween 0 and 255. If EOF is reached,-1is returned.Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting. The bit offset within the stream must be reset to zero before the read occurs. - Specified by:
- readin interface- ImageInputStream
- Specified by:
- readin class- ImageInputStreamImpl
- Returns:
- the value of the next byte in the stream, or -1if EOF is reached.
- Throws:
- IOException- if the stream has been closed.
 
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readDescription copied from class:ImageInputStreamImplReads up tolenbytes from the stream, and stores them intobstarting at indexoff. If no bytes can be read because the end of the stream has been reached,-1is returned.The bit offset within the stream must be reset to zero before the read occurs. Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting. - Specified by:
- readin interface- ImageInputStream
- Specified by:
- readin class- ImageInputStreamImpl
- Parameters:
- b- an array of bytes to be written to.
- off- the starting position within- bto write to.
- len- the maximum number of bytes to read.
- Returns:
- the number of bytes actually read, or -1to indicate EOF.
- Throws:
- IOException- if an I/O error occurs.
 
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lengthpublic long length()Returns the length of the underlying file, or-1if it is unknown.- Specified by:
- lengthin interface- ImageInputStream
- Overrides:
- lengthin class- ImageInputStreamImpl
- Returns:
- the file length as a long, or-1.
 
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finalizeDeprecated, for removal: This API element is subject to removal in a future version.Finalization has been deprecated for removal. SeeObject.finalize()for background information and details about migration options.Finalizes this object prior to garbage collection. Theclosemethod is called to close any open input source. This method should not be called from application code.- Overrides:
- finalizein class- ImageInputStreamImpl
- Throws:
- Throwable- if an error occurs during superclass finalization.
- See Also:
 
 
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