| java.lang.Object | ||
| ↳ | com.pspdfkit.document.providers.ContextDataProvider | |
| ↳ | com.pspdfkit.document.providers.InputStreamDataProvider | |
 Known Direct Subclasses
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Class Overview
Abstract data provider that handles serving a PDF document from an InputStream. Since
viewing the PDF document needs random access, this class wraps the logic for re-opening the
stream for backwards-seek operations. Subclasses need to override the openInputStream()
method, which needs to return a new InputStream instance every time it is called.
Summary
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Inherited Constants | |||||||||||
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From interface
com.pspdfkit.document.providers.DataProvider
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Inherited Fields | |||||||||||
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From interface
com.pspdfkit.document.providers.DataProvider
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| Public Constructors | |||||||||||
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| InputStreamDataProvider() | |||||||||||
| Public Methods | |||||||||||
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| byte[] | read(long size, long offset) | ||||||||||
| void | release() | ||||||||||
| Protected Methods | |||||||||||
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| long |
getInputStreamPosition()
Returns the current position inside the read
InputStream. | ||||||||||
| abstract InputStream |
openInputStream()
Subclasses need to override this method and return a readable input stream which servers the
PDF document.
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| final void |
reopenInputStream()
Close the internal input stream and reopen it.
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Inherited Methods | |||||||||||
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From class
com.pspdfkit.document.providers.ContextDataProvider
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From class
java.lang.Object
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From interface
com.pspdfkit.document.providers.DataProvider
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Public Constructors
public InputStreamDataProvider ()
Public Methods
public byte[] read (long size, long offset)
public void release ()
Protected Methods
protected long getInputStreamPosition ()
Returns the current position inside the read InputStream. Every read operation on the
data provider will increase this position. To reset the read position to 0 call
reopenInputStream().
Returns
- The current input stream position (in bytes).
protected abstract InputStream openInputStream ()
Subclasses need to override this method and return a readable input stream which servers the
PDF document. This method must return a new InputStream instance
every time it is called. This is necessary so InputStreamDataProvider can actually
"simulate" random data access on the underlying stream.
Returns
- A new instance of the InputStream that servers the PDF document.
Throws
| Exception | If the implementation fails to open the input stream for reading. |
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protected final void reopenInputStream ()
Close the internal input stream and reopen it. This is used to rewind the stream, if it is necessary to "seek backwards". Subclasses may call this method to safely rewind the stream to the beginning.
Throws
| Exception | If the implementation fails to close or open the input stream for reading. |
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