Class ByteSource.ConcatenatedByteSource
- Enclosing class:
- ByteSource
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Nested Class Summary
Nested classes/interfaces inherited from class com.google.common.io.ByteSource
ByteSource.AsCharSource -
Field Summary
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionbooleanisEmpty()Returns whether the source has zero bytes.Opens a newInputStreamfor reading from this source.longsize()Returns the size of this source in bytes, even if doing so requires opening and traversing an entire stream.Returns the size of this source in bytes, if the size can be easily determined without actually opening the data stream.toString()Methods inherited from class com.google.common.io.ByteSource
asCharSource, concat, concat, concat, contentEquals, copyTo, copyTo, empty, hash, openBufferedStream, read, read, slice, wrap
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Field Details
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sources
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Constructor Details
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ConcatenatedByteSource
ConcatenatedByteSource(Iterable<? extends ByteSource> sources)
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Method Details
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openStream
Description copied from class:ByteSourceOpens a newInputStreamfor reading from this source. This method returns a new, independent stream each time it is called.The caller is responsible for ensuring that the returned stream is closed.
- Specified by:
openStreamin classByteSource- Throws:
IOException- if an I/O error occurs while opening the stream
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isEmpty
Description copied from class:ByteSourceReturns whether the source has zero bytes. The default implementation first checksByteSource.sizeIfKnown(), returning true if it's known to be zero and false if it's known to be non-zero. If the size is not known, it falls back to opening a stream and checking for EOF.Note that, in cases where
sizeIfKnownreturns zero, it is possible that bytes are actually available for reading. (For example, some special files may return a size of 0 despite actually having content when read.) This means that a source may returntruefromisEmpty()despite having readable content.- Overrides:
isEmptyin classByteSource- Throws:
IOException- if an I/O error occurs
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sizeIfKnown
Description copied from class:ByteSourceReturns the size of this source in bytes, if the size can be easily determined without actually opening the data stream.The default implementation returns
Optional.absent(). Some sources, such as a file, may return a non-absent value. Note that in such cases, it is possible that this method will return a different number of bytes than would be returned by reading all of the bytes (for example, some special files may return a size of 0 despite actually having content when read).Additionally, for mutable sources such as files, a subsequent read may return a different number of bytes if the contents are changed.
- Overrides:
sizeIfKnownin classByteSource
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size
Description copied from class:ByteSourceReturns the size of this source in bytes, even if doing so requires opening and traversing an entire stream. To avoid a potentially expensive operation, seeByteSource.sizeIfKnown().The default implementation calls
ByteSource.sizeIfKnown()and returns the value if present. If absent, it will fall back to a heavyweight operation that will open a stream, read (orskip, if possible) to the end of the stream and return the total number of bytes that were read.Note that for some sources that implement
ByteSource.sizeIfKnown()to provide a more efficient implementation, it is possible that this method will return a different number of bytes than would be returned by reading all of the bytes (for example, some special files may return a size of 0 despite actually having content when read).In either case, for mutable sources such as files, a subsequent read may return a different number of bytes if the contents are changed.
- Overrides:
sizein classByteSource- Throws:
IOException- if an I/O error occurs while reading the size of this source
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toString
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