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java.lang.Object org.terrier.structures.DirectInvertedOutputStream
public class DirectInvertedOutputStream
Writes a block direct or block inverted index, when passed appropriate posting lists.
Field Summary | |
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protected static org.apache.log4j.Logger |
logger
The logger used |
protected BitOut |
output
what to write to |
Constructor Summary | |
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DirectInvertedOutputStream(BitOut out)
Creates a new output stream, writing to the specified BitOut implementation. |
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DirectInvertedOutputStream(java.lang.String filename)
Creates a new output stream, writing a BitOutputStream to the specified file. |
Method Summary | |
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void |
close()
close this object. |
byte |
getBitOffset()
Deprecated. |
BitOut |
getBitOut()
Return the underlying BitOut implementation being used by the class |
long |
getByteOffset()
Deprecated. |
BitFilePosition |
getOffset()
What is current offset? |
java.lang.Class<? extends IterablePosting> |
getPostingIteratorClass()
Returns the IterablePosting class to use for reading structure written by this class |
protected BitIndexPointer |
writeNoFieldPostings(int[][] postings,
int offset,
int length,
int firstId)
Writes the given postings to the bit file. |
protected void |
writePostingNotDocid(Posting p)
Hook method for writing out the remainder of the posting |
BitIndexPointer |
writePostings(int[][] postings,
int firstId)
Write out the specified postings. |
BitIndexPointer |
writePostings(int[][] postings,
int startOffset,
int Length,
int firstId)
Write out a range of the specified postings. |
BitIndexPointer |
writePostings(IterablePosting postings)
Write out the specified postings. |
BitIndexPointer |
writePostings(IterablePosting postings,
int previousId)
Write out the specified postings, but allowing the delta for the first document to be adjusted |
BitIndexPointer |
writePostings(java.util.Iterator<Posting> iterator)
Write out the specified postings. |
BitIndexPointer |
writePostings(java.util.Iterator<Posting> iterator,
int previousId)
Write out the specified postings, but allowing the delta for the first document to be adjusted |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected BitOut output
protected static final org.apache.log4j.Logger logger
Constructor Detail |
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public DirectInvertedOutputStream(java.lang.String filename) throws java.io.IOException
filename
- Location of the file to write to
java.io.IOException
public DirectInvertedOutputStream(BitOut out)
out
- BitOut implementation to write the file toMethod Detail |
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public java.lang.Class<? extends IterablePosting> getPostingIteratorClass()
public BitIndexPointer writePostings(int[][] postings, int firstId) throws java.io.IOException
postings
- The postings to write outfirstId
- the (delta) value of the first docid to write out.
java.io.IOException
public BitIndexPointer writePostings(java.util.Iterator<Posting> iterator) throws java.io.IOException
iterator
- an Iterator of Posting objects
java.io.IOException
public BitIndexPointer writePostings(java.util.Iterator<Posting> iterator, int previousId) throws java.io.IOException
iterator
- an Iterator of Posting objectspreviousId
- id of the previous posting in this stream
java.io.IOException
public BitIndexPointer writePostings(IterablePosting postings, int previousId) throws java.io.IOException
postings
- IterablePosting postings accessed through an IterablePosting objectpreviousId
- id of the previous posting in this stream
java.io.IOException
public BitIndexPointer writePostings(IterablePosting postings) throws java.io.IOException
postings
- IterablePosting postings accessed through an IterablePosting object
java.io.IOException
protected void writePostingNotDocid(Posting p) throws java.io.IOException
java.io.IOException
public BitIndexPointer writePostings(int[][] postings, int startOffset, int Length, int firstId) throws java.io.IOException
postings
- The postings to write outstartOffset
- The location of the first posting to write out.Length
- The number of postings to be written out.firstId
- the (delta) value of the first docid to write out.
java.io.IOException
protected BitIndexPointer writeNoFieldPostings(int[][] postings, int offset, int length, int firstId) throws java.io.IOException
postings
- the postings list to write.firstId
- the first identifier to write. This can be
an id plus one, or the gap of the current id and the previous one.offset
- The location of the first posting to write out.length
- The number of postings to be written out.
java.io.IOException
- if an error occurs during writing to a file.public void close()
close
in interface java.io.Closeable
public BitFilePosition getOffset()
public long getByteOffset()
public byte getBitOffset()
public BitOut getBitOut()
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