DTMSafeStringPool (Xalan-Java 2.7.2)

java.lang.Object
- org.apache.xml.dtm.ref.DTMStringPool
- - org.apache.xml.dtm.ref.DTMSafeStringPool

```
public class DTMSafeStringPool
extends DTMStringPool
```
Like DTMStringPool, but threadsafe. It's been proposed that DTMs share their string pool(s); that raises threadsafety issues which this addresses. Of course performance is inferior to that of the bare-bones version.

Status: Passed basic test in main().

Field Summary
- Fields inherited from class org.apache.xml.dtm.ref.DTMStringPool
  NULL

Constructor Summary

Constructors
Constructor Description

DTMSafeStringPool()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.String`	`indexToString(int i)`
`static void`	`main(java.lang.String[] args)`	Command-line unit test driver.
`void`	`removeAllElements()`
`int`	`stringToIndex(java.lang.String s)`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DTMSafeStringPool
```
public DTMSafeStringPool()
```
- Method Detail
  - removeAllElements
```
public void removeAllElements()
```
    Overrides:
    
    removeAllElements in class DTMStringPool
  - indexToString
```
public java.lang.String indexToString(int i)
                               throws java.lang.ArrayIndexOutOfBoundsException
```
    Overrides:
    
    indexToString in class DTMStringPool
    
    Returns:
    
    string whose value is uniquely identified by this integer index.
    
    Throws:
    
    java.lang.ArrayIndexOutOfBoundsException - if index doesn't map to a string.
  - stringToIndex
```
public int stringToIndex(java.lang.String s)
```
    Overrides:
    
    stringToIndex in class DTMStringPool
    
    Returns:
    
    integer index uniquely identifying the value of this string.
  - main
```
public static void main(java.lang.String[] args)
```
    Command-line unit test driver. This test relies on the fact that this version of the pool assigns indices consecutively, starting from zero, as new unique strings are encountered.