org.apache.lucene.util.compress

Class LowercaseAsciiCompression

java.lang.Object

org.apache.lucene.util.compress.LowercaseAsciiCompression

public final class LowercaseAsciiCompression
extends Object

Utility class that can efficiently compress arrays that mostly contain characters in the [0x1F,0x3F) or [0x5F,0x7F) ranges, which notably include all digits, lowercase characters, '.', '-' and '_'.

Method Summary

Modifier and Type	Method and Description
static boolean	compress(byte[] in, int len, byte[] tmp, DataOutput out) Compress in[0:len] into out.
static void	decompress(DataInput in, byte[] out, int len) Decompress data that has been compressed with compress(byte[], int, byte[], DataOutput).

Methods inherited from class java.lang.Object

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

Method Detail

compress

public static boolean compress(byte[] in,
                               int len,
                               byte[] tmp,
                               DataOutput out)
                        throws IOException

Compress in[0:len] into out. This returns false if the content cannot be compressed. The number of bytes written is guaranteed to be less than len otherwise.

Throws:

IOException

decompress

public static void decompress(DataInput in,
                              byte[] out,
                              int len)
                       throws IOException

Decompress data that has been compressed with compress(byte[], int, byte[], DataOutput). len must be the original length, not the compressed length.

Throws:

IOException