Package org.apache.tika.parser

Class ParsingReader

java.lang.Object

java.io.Reader

org.apache.tika.parser.ParsingReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class ParsingReader
extends Reader

Reader for the text content from a given binary stream. This class uses a background parsing task with a Parser (AutoDetectParser by default) to parse the text content from a given input stream. The BodyContentHandler class and a pipe is used to convert the push-based SAX event stream to the pull-based character stream defined by the Reader interface.

Since:

Apache Tika 0.2

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor	Description
ParsingReader(File file)	Creates a reader for the text content of the given file.
ParsingReader(InputStream stream)	Creates a reader for the text content of the given binary stream.
ParsingReader(InputStream stream, String name)	Creates a reader for the text content of the given binary stream with the given name.
ParsingReader(Path path)	Creates a reader for the text content of the file at the given path.
ParsingReader(Parser parser, InputStream stream, Metadata metadata, ParseContext context)	Creates a reader for the text content of the given binary stream with the given document metadata.
ParsingReader(Parser parser, InputStream stream, Metadata metadata, ParseContext context, Executor executor)	Creates a reader for the text content of the given binary stream with the given document metadata.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the read end of the pipe.
int	read(char[] cbuf, int off, int len)	Reads parsed text from the pipe connected to the parsing thread.

Methods inherited from class java.io.Reader

mark, markSupported, nullReader, read, read, read, ready, reset, skip, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ParsingReader

public ParsingReader(InputStream stream)
              throws IOException

Creates a reader for the text content of the given binary stream.

Parameters:

stream - binary stream

Throws:

IOException - if the document can not be parsed

ParsingReader

public ParsingReader(InputStream stream,
 String name)
              throws IOException

Creates a reader for the text content of the given binary stream with the given name.

Parameters:

stream - binary stream

name - document name

Throws:

IOException - if the document can not be parsed

ParsingReader

public ParsingReader(Path path)
              throws IOException

Creates a reader for the text content of the file at the given path.

Parameters:

path - path

Throws:

FileNotFoundException - if the given file does not exist

IOException - if the document can not be parsed

ParsingReader

public ParsingReader(File file)
              throws FileNotFoundException,
IOException

Creates a reader for the text content of the given file.

Parameters:

file - file

Throws:

FileNotFoundException - if the given file does not exist

IOException - if the document can not be parsed

See Also:

• ParsingReader(Path)

ParsingReader

public ParsingReader(Parser parser,
 InputStream stream,
 Metadata metadata,
 ParseContext context)
              throws IOException

Creates a reader for the text content of the given binary stream with the given document metadata. The given parser is used for parsing. A new background thread is started for the parsing task.

The created reader will be responsible for closing the given stream. The stream and any associated resources will be closed at or before the time when the close() method is called on this reader.

Parameters:

parser - parser instance

stream - binary stream

metadata - document metadata

Throws:

IOException - if the document can not be parsed

ParsingReader

public ParsingReader(Parser parser,
 InputStream stream,
 Metadata metadata,
 ParseContext context,
 Executor executor)
              throws IOException

Creates a reader for the text content of the given binary stream with the given document metadata. The given parser is used for the parsing task that is run with the given executor. The given executor must run the parsing task asynchronously in a separate thread, since the current thread must return to the caller that can then consume the parsed text through the Reader interface.

The created reader will be responsible for closing the given stream. The stream and any associated resources will be closed at or before the time when the close() method is called on this reader.

Parameters:

parser - parser instance

stream - binary stream

metadata - document metadata

context - parsing context

executor - executor for the parsing task

Throws:

IOException - if the document can not be parsed

Since:

Apache Tika 0.4

Method Details

read

public int read(char[] cbuf,
 int off,
 int len)
         throws IOException

Reads parsed text from the pipe connected to the parsing thread. Fails if the parsing thread has thrown an exception.

Specified by:

read in class Reader

Parameters:

cbuf - character buffer

off - start offset within the buffer

len - maximum number of characters to read

Throws:

IOException - if the parsing thread has failed or if for some reason the pipe does not work properly

close

public void close()
           throws IOException

Closes the read end of the pipe. If the parsing thread is still running, next write to the pipe will fail and cause the thread to stop. Thus there is no need to explicitly terminate the thread.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException - if the pipe can not be closed