org.ttzero.excel.reader

类 SharedStrings

java.lang.Object

org.ttzero.excel.reader.SharedStrings

所有已实现的接口:

Closeable, AutoCloseable

public class SharedStrings
extends Object
implements Closeable

Read sharedString data

For large files, it is impossible to load all data into the memory and get it by index. The current practice is to partition and divide the data into three areas: forward, backward, and hot. The newly read data is placed in the forward area, if not found in forward area, go to the backward area to find, finally go to the hot area to find it. If not found in the three areas, press the ward will be re-load in to the forward area. The original forwarding area data is copied to the backward area. The blocks loaded twice will be marked, the marked blocks will be placed in the hot area when they are repeatedly read, and the hot area will be eliminated by the LRU page replacement algorithm.

作者:

guanquan.wang at 2018-09-27 14:28

构造器概要

构造器

构造器和说明
SharedStrings(IndexSharedStringTable sst, int cacheSize, int hotSize) Constructs a SharedStrings with a IndexSharedStringTable
SharedStrings(Path sstPath, int cacheSize, int hotSize) Constructs a SharedString with the xml path, please call load() after instance
SharedStrings(String[] data) Constructs a SharedStrings containing the elements of the specified data array

方法概要

限定符和类型	方法和说明
void	close() close stream and free space
String	get(int index) Getting the strings value by index
SharedStrings	load() Load the sharedString.xml file and instance word cache
protected int	readData() Read data from main reader forward only
protected void	readMore() Load string record from xml
int	size()
static int	tableSizeFor(int cap) Returns a power of two size for the given target capacity.
String	toString()

从类继承的方法 java.lang.Object

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

构造器详细资料

SharedStrings

public SharedStrings(String[] data)

Constructs a SharedStrings containing the elements of the specified data array

参数:

data - the shared strings

SharedStrings

public SharedStrings(Path sstPath,
                     int cacheSize,
                     int hotSize)

Constructs a SharedString with the xml path, please call load() after instance

参数:

sstPath - the xml file path

cacheSize - the number of word per load

hotSize - the number of high frequency word

SharedStrings

public SharedStrings(IndexSharedStringTable sst,
                     int cacheSize,
                     int hotSize)
              throws IOException

Constructs a SharedStrings with a IndexSharedStringTable

参数:

sst - IndexSharedStringTable

cacheSize - the number of word per load

hotSize - the number of high frequency word

抛出:

IOException - if I/O error occur.

方法详细资料

size

public int size()

返回:

the shared string unique count -1 if unknown size

tableSizeFor

public static int tableSizeFor(int cap)

Returns a power of two size for the given target capacity.

参数:

cap - the custom buffer size

返回:

Returns a power of two size

load

public SharedStrings load()
                   throws IOException

Load the sharedString.xml file and instance word cache

返回:

the SharedStrings

抛出:

IOException - if io error occur

get

public String get(int index)

Getting the strings value by index

参数:

index - the index of SharedStringTable

返回:

string

readMore

protected void readMore()

Load string record from xml

readData

protected int readData()
                throws IOException

Read data from main reader forward only

返回:

the word count

抛出:

IOException - if I/O error occur

close

public void close()
           throws IOException

close stream and free space

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

抛出:

IOException

toString

public String toString()

覆盖:

toString 在类中 Object