org.apache.hadoop.hbase.filter

类 RegexStringComparator

java.lang.Object

org.apache.hadoop.hbase.filter.ByteArrayComparable

org.apache.hadoop.hbase.filter.RegexStringComparator

所有已实现的接口:

Comparable<byte[]>

@InterfaceAudience.Public
public class RegexStringComparator
extends ByteArrayComparable

This comparator is for use with CompareFilter implementations, such as RowFilter, QualifierFilter, and ValueFilter, for filtering based on the value of a given column. Use it to test if a given regular expression matches a cell value in the column.

Only EQUAL or NOT_EQUAL comparisons are valid with this comparator.

For example:

 ValueFilter vf = new ValueFilter(CompareOp.EQUAL,
     new RegexStringComparator(
       // v4 IP address
       "(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3,3}" +
         "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))(\\/[0-9]+)?" +
         "|" +
       // v6 IP address
       "((([\\dA-Fa-f]{1,4}:){7}[\\dA-Fa-f]{1,4})(:([\\d]{1,3}.)" +
         "{3}[\\d]{1,3})?)(\\/[0-9]+)?"));
 

Supports Pattern flags as well:

 ValueFilter vf = new ValueFilter(CompareOp.EQUAL,
     new RegexStringComparator("regex", Pattern.CASE_INSENSITIVE | Pattern.DOTALL));
 

另请参阅:

Pattern

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	RegexStringComparator.EngineType Engine implementation type (default=JAVA)

构造器概要

构造器

构造器和说明
RegexStringComparator(String expr) Constructor Adds Pattern.DOTALL to the underlying Pattern
RegexStringComparator(String expr, int flags) Constructor
RegexStringComparator(String expr, int flags, RegexStringComparator.EngineType engine) Constructor
RegexStringComparator(String expr, RegexStringComparator.EngineType engine) Constructor Adds Pattern.DOTALL to the underlying Pattern

方法概要

限定符和类型	方法和说明
int	compareTo(byte[] value, int offset, int length)
static RegexStringComparator	parseFrom(byte[] pbBytes)
void	setCharset(Charset charset) Specifies the Charset to use to convert the row key to a String.
byte[]	toByteArray()

从类继承的方法 org.apache.hadoop.hbase.filter.ByteArrayComparable

compareTo, compareTo, getValue

从类继承的方法 java.lang.Object

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

构造器详细资料

RegexStringComparator

public RegexStringComparator(String expr)

Constructor Adds Pattern.DOTALL to the underlying Pattern

参数:

expr - a valid regular expression

RegexStringComparator

public RegexStringComparator(String expr,
                             RegexStringComparator.EngineType engine)

Constructor Adds Pattern.DOTALL to the underlying Pattern

参数:

expr - a valid regular expression

engine - engine implementation type

RegexStringComparator

public RegexStringComparator(String expr,
                             int flags)

Constructor

参数:

expr - a valid regular expression

flags - java.util.regex.Pattern flags

RegexStringComparator

public RegexStringComparator(String expr,
                             int flags,
                             RegexStringComparator.EngineType engine)

Constructor

参数:

expr - a valid regular expression

flags - java.util.regex.Pattern flags

engine - engine implementation type

方法详细资料

setCharset

public void setCharset(Charset charset)

Specifies the Charset to use to convert the row key to a String.

The row key needs to be converted to a String in order to be matched against the regular expression. This method controls which charset is used to do this conversion.

If the row key is made of arbitrary bytes, the charset ISO-8859-1 is recommended.

参数:

charset - The charset to use.

compareTo

public int compareTo(byte[] value,
                     int offset,
                     int length)

指定者:

compareTo 在类中 ByteArrayComparable

toByteArray

public byte[] toByteArray()

指定者:

toByteArray 在类中 ByteArrayComparable

返回:

The comparator serialized using pb

parseFrom

public static RegexStringComparator parseFrom(byte[] pbBytes)
                                       throws DeserializationException

参数:

pbBytes - A pb serialized RegexStringComparator instance

返回:

An instance of RegexStringComparator made from bytes

抛出:

DeserializationException

另请参阅:

toByteArray()