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DTMSafeStringPool.javaAPI DocJava SE 5 API3614Fri Aug 26 14:56:00 BST 2005com.sun.org.apache.xml.internal.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().

Fields Summary
Constructors Summary
Methods Summary
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.

    String[] word={
      "Zero","One","Two","Three","Four","Five",
      "Six","Seven","Eight","Nine","Ten",
      "Eleven","Twelve","Thirteen","Fourteen","Fifteen",
      "Sixteen","Seventeen","Eighteen","Nineteen","Twenty",
      "Twenty-One","Twenty-Two","Twenty-Three","Twenty-Four",
      "Twenty-Five","Twenty-Six","Twenty-Seven","Twenty-Eight",
      "Twenty-Nine","Thirty","Thirty-One","Thirty-Two",
      "Thirty-Three","Thirty-Four","Thirty-Five","Thirty-Six",
      "Thirty-Seven","Thirty-Eight","Thirty-Nine"};

    DTMStringPool pool=new DTMSafeStringPool();

    System.out.println("If no complaints are printed below, we passed initial test.");

    for(int pass=0;pass<=1;++pass)
      {
        int i;

        for(i=0;i<word.length;++i)
          {
            int j=pool.stringToIndex(word[i]);
            if(j!=i)
              System.out.println("\tMismatch populating pool: assigned "+
                                 j+" for create "+i);
          }

        for(i=0;i<word.length;++i)
          {
            int j=pool.stringToIndex(word[i]);
            if(j!=i)
              System.out.println("\tMismatch in stringToIndex: returned "+
                                 j+" for lookup "+i);
          }

        for(i=0;i<word.length;++i)
          {
            String w=pool.indexToString(i);
            if(!word[i].equals(w))
              System.out.println("\tMismatch in indexToString: returned"+
                                 w+" for lookup "+i);
          }
        
        pool.removeAllElements();
        
        System.out.println("\nPass "+pass+" complete\n");
      } // end pass loop
  
public synchronized java.lang.StringindexToString(int i)

return
string whose value is uniquely identified by this integer index.
throws
java.lang.ArrayIndexOutOfBoundsException if index doesn't map to a string.

      return super.indexToString(i);
    
public synchronized voidremoveAllElements()

      super.removeAllElements();
    
public synchronized intstringToIndex(java.lang.String s)

return
integer index uniquely identifying the value of this string.

      return super.stringToIndex(s);