Examples of com.dbxml.db.core.data.Value

com.dbxml.db.core.data.Value
Value is the primary base class for all data storing objects. The content window of Value objects are immutable, but the underlying byte array is not.

      if ( c == null ) {
         c = w;
         c.valID = nextValID++;
         map.put(c, c);


         Value v = new Value(c.data);
         ValueTableEntry e = new ValueTableEntry(dataSize, c.data.length);
         values.add(new ValueInfo(v, e));
         dataSize += c.data.length;
      }
      entries.add(new DocumentTableEntry(typeID, c.valID));

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      ValueTableEntry vte = getValueEntry(idx);
      return getValue(vte);
   }


   public Value getValue(ValueTableEntry vte) {
      return new Value(data, dataOffset+vte.getOffset(), vte.getLength());
   }

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                     b[0] = 0;
                  else
                     return EmptyValue;
                  break;
            }
            return new Value(b);
         }
         catch ( Exception e ) {
            return EmptyValue;
         }
      }


      if ( type == TRIMMED )
         value = QueryEngine.normalizeString(value);


      return new Value(value);
   }

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      return new Value(value);
   }


   private Value getCombinedValue(Value value, Key key, int pos, int elemID, int attrID) {
      Value result;
      try {
         int valSize = value.getLength();
         int keySize = key.getLength();
         int totalSize = valSize+keySize+16;


         byte[] b = new byte[totalSize];


         System.arraycopy(value.getRawData(), value.getOffset(), b, 0, valSize);
         System.arraycopy(key.getRawData(), key.getOffset(), b, valSize+1, keySize);


         int l = valSize+keySize+2;


         ByteArray.writeInt(b, l, pos);    // Write the pos
         ByteArray.writeInt(b, l+4, elemID); // Write the elemID
         ByteArray.writeInt(b, l+8, attrID); // Write the attrID
         ByteArray.writeShort(b, l+12, (short)valSize);


         result = new Value(b);
      }
      catch ( Exception e ) {
         result = null; // This will never happen
      }
      return result;

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      return new IndexMatch(key, pos, elemID, attrID);
   }


   public void remove(Transaction tx, String value, Key key, int pos, int elemID, int attrID) throws DBException {
      Value v = getTypedValue(value);
      if ( type != STRING && type != TRIMMED && v.getLength() == 0 )
         return;


      try {
         Value cv = getCombinedValue(v, key, pos, elemID, attrID);
         removeValue(tx, cv);
      }
      catch ( DBException d ) {
         throw d;
      }

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         e.printStackTrace(System.err);
      }
   }


   public void add(Transaction tx, String value, Key key, int pos, int elemID, int attrID) throws DBException {
      Value v = getTypedValue(value);
      if ( type != STRING && type != TRIMMED && v.getLength() == 0 )
         return;


      try {
         Value cv = getCombinedValue(v, key, pos, elemID, attrID);
         addValue(tx, cv, MATCH_INFO);
      }
      catch ( DBException d ) {
         throw d;
      }

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      private synchronized void setLoaded(boolean loaded) {
         this.loaded = loaded;
      }


      public synchronized void read(Transaction tx) throws DBException, IOException {
         Value v = readValue(tx, page);
         DataInputStream is = new DataInputStream(v.getInputStream());


         // Read in the common prefix (if any)
         short pfxLen = ph.getPrefixLength();
         byte[] pfxBytes;
         if ( pfxLen > 0 ) {
            pfxBytes = new byte[pfxLen];
            is.read(pfxBytes);
         }
         else {
            prefix = EmptyValue;
            pfxBytes = EmptyBytes;
         }


         // Read in the pointers
         ptrs = new long[ph.getPointerCount()];
         for ( int i = 0; i < ptrs.length; i++ )
            ptrs[i] = is.readLong();


         // Read in the Values
         values = new Value[ph.getValueCount()];
         for ( int i = 0; i < values.length; i++ ) {
            short len = is.readShort();
            byte[] b = new byte[pfxLen+len];


            if ( pfxLen > 0 )
               System.arraycopy(pfxBytes, 0, b, 0, pfxLen);


            if ( len > 0 )
               is.read(b, pfxLen, len);
            values[i] = new Value(b);
         }


         cache.put(new Long(page.getPageNum()), this);
      }

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         for ( int i = 0; i < ptrs.length; i++ )
            os.writeLong(ptrs[i]);


         // Write out the Values
         for ( int i = 0; i < values.length; i++ ) {
            Value v = values[i];
            byte[] b = v.getRawData();
            int pos = v.getOffset();
            int len = v.getLength();
            os.writeShort(len-pfxLen);
            if ( len-pfxLen > 0 )
               os.write(b, pos+pfxLen, len-pfxLen);
         }


         writeValue(tx, page, new Value(bos.toByteArray()));


         cache.put(new Long(page.getPageNum()), this);
      }

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      private Value getPrefix(Value value1, Value value2) {
         int idx = Math.abs(value1.compareTo(value2))-1;
         if ( idx > 0 ) {
            byte[] b = value2.getRawData();
            int pos = value2.getOffset();
            return new Value(b, pos, idx);
         }
         else
            return EmptyValue;
      }

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      private Value getSeparator(Value value1, Value value2) {
         int idx = Math.abs(value1.compareTo(value2));
         byte[] b = value2.getRawData();
         int pos = value2.getOffset();
         return new Value(b, pos, idx);
      }

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