import org.simantics.db.Resource;
import org.simantics.db.common.procedure.wrapper.NoneToAsyncProcedure;
import org.simantics.db.common.procedure.wrapper.SyncToAsyncProcedure;
+import org.simantics.db.exception.AssumptionException;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.impl.ClusterI;
import org.simantics.db.impl.ClusterI.ClusterTypeEnum;
import org.simantics.db.request.AsyncRead;
import org.simantics.db.service.DirectQuerySupport;
+/**
+ * Note that the direct value retrieval in this implementation only supports
+ * String-type literals - nothing else!
+ *
+ * This implementation is mainly intended for optimizing database indexing
+ * performance.
+ */
public class DirectQuerySupportImpl implements DirectQuerySupport {
final private SessionImplSocket session;
}
+ @SuppressWarnings("unchecked")
private <T> void getValue4(final ReadGraphImpl graph, final ClusterImpl containerCluster, final int subject, final ForPossibleRelatedValueProcedure<T> procedure) {
Object result = null;
}
+ @SuppressWarnings("unchecked")
private <C, T> void getValue4(final ReadGraphImpl graph, final ClusterImpl containerCluster, final int subject, final C context, final ForPossibleRelatedValueContextProcedure<C, T> procedure) {
Object result = null;
try {
byte[] bytes = cluster.getValue(subject, session.clusterTranslator);
- T value = (T)utf(bytes);
+ @SuppressWarnings("unchecked")
+ T value = (T)utf(bytes, 0);
procedure.execute(graph, context, value);
} catch (DatabaseException e) {
procedure.execute(graph, context, null);
try {
byte[] bytes = cluster.getValue(subject, session.clusterTranslator);
- T value = (T)utf(bytes);
+ @SuppressWarnings("unchecked")
+ T value = (T)utf(bytes, 0);
procedure.execute(graph, value);
} catch (DatabaseException e) {
procedure.execute(graph, null);
if(bytes == null) {
procedure.execute(graph, context, null);
} else {
- T value = (T)utf(bytes);
+ @SuppressWarnings("unchecked")
+ T value = (T)utf(bytes, 0);
procedure.execute(graph, context, value);
}
} catch (DatabaseException e) {
}
- private final char[] chars = new char[1024];
-
private <T> void getDirectValue4(final ReadGraphImpl graph, final ClusterSmall cluster, final int subject, final ForPossibleRelatedValueProcedure<T> procedure) {
+ try {
+ // Note: this code avoids creating an intermediate byte[]
+ // to store the encoded string bytes and reads the UTF string
+ // from the value table byte[] directly into String instead.
- ResourceTableSmall rt = cluster.resourceTable;
- ValueTableSmall vt = cluster.valueTable;
-
- byte[] bs = vt.table;
- long[] ls = rt.table;
+ ResourceTableSmall rt = cluster.resourceTable;
+ ValueTableSmall vt = cluster.valueTable;
- int index = ((subject&0xFFFF) << 1) - 1 + rt.offset;
+ byte[] bs = vt.table;
+ long[] ls = rt.table;
- int valueIndex = (int)(ls[index] >>> 24) & 0x3FFFFF + vt.offset;
+ int index = ((subject&0xFFF) << 1) - 1 + rt.offset;
+ int valueIndex = ((int)(ls[index] >>> 24) & 0x3FFFFF) + vt.offset;
- int size = (int)bs[valueIndex++]-1;
- valueIndex++;
- for(int i=0;i<size;i++) {
- chars[i] = (char)bs[valueIndex++];
- }
+ int size = bs[valueIndex++];
+ if (size < 0) // two byte size
+ size = (int)(((size & 0x7F) << 8) | (bs[valueIndex++] & 0xFF));
+ if (size <= 0)
+ throw new DatabaseException("No value for " + subject);
- T value = (T)new String(chars, 0, size);
+ @SuppressWarnings("unchecked")
+ T t = (T) utf(bs, valueIndex);
- procedure.execute(graph, value);
-// graph.dec();
-
+ procedure.execute(graph, t);
+ } catch (DatabaseException e) {
+ procedure.exception(graph, e);
+ }
}
- final private String utf(byte[] bytes) {
-
+ final private String utf(byte[] bytes, int offset) throws AssumptionException {
+
if(bytes == null) return null;
-
- int index = 0;
+
+ // Read databoard int32 using Length encoding
+ // https://dev.simantics.org/index.php/Databoard_Specification#Length
+ int index = offset;
int length = bytes[index++]&0xff;
if(length >= 0x80) {
if(length >= 0xc0) {
length += 0x80;
}
}
-
- int i = 0;
- int target = length+index;
- while(index < target) {
- int c = bytes[index++]&0xff;
- if(c <= 0x7F) {
- chars[i++] = (char)(c&0x7F);
- } else if (c > 0x07FF) {
- int c2 = bytes[index++]&0xff;
- int c3 = bytes[index++]&0xff;
- chars[i++] = (char)(((c&0xf)<<12) + ((c2&0x3f)<<6) + (c3&0x3f));
- } else {
- int c2 = bytes[index++]&0xff;
- chars[i++] = (char)(((c&0x1f)<<6) + (c2&0x3f));
+
+ // Copied from DataInputStream
+ int utflen = length;
+ char[] chararr = new char[utflen];
+
+ int c, char2, char3;
+ int count = index;
+ int target = index + length;
+ int chararr_count=0;
+
+ while (count < target) {
+ c = (int) bytes[count] & 0xff;
+ if (c > 127) break;
+ count++;
+ chararr[chararr_count++]=(char)c;
+ }
+
+ while (count < target) {
+ c = (int) bytes[count] & 0xff;
+ switch (c >> 4) {
+ case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
+ /* 0xxxxxxx*/
+ count++;
+ chararr[chararr_count++]=(char)c;
+ break;
+ case 12: case 13:
+ /* 110x xxxx 10xx xxxx*/
+ count += 2;
+ if (count > target)
+ throw new AssumptionException(
+ "malformed input: partial character at end (" + (count-index) + " > " + utflen + ")");
+ char2 = (int) bytes[count-1];
+ if ((char2 & 0xC0) != 0x80)
+ throw new AssumptionException(
+ "malformed input around byte " + count);
+ chararr[chararr_count++]=(char)(((c & 0x1F) << 6) |
+ (char2 & 0x3F));
+ break;
+ case 14:
+ /* 1110 xxxx 10xx xxxx 10xx xxxx */
+ count += 3;
+ if (count > target)
+ throw new AssumptionException(
+ "malformed input: partial character at end (" + (count-index) + " > " + utflen + ")");
+ char2 = (int) bytes[count-2];
+ char3 = (int) bytes[count-1];
+ if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
+ throw new AssumptionException(
+ "malformed input around byte " + (count-1));
+ chararr[chararr_count++]=(char)(((c & 0x0F) << 12) |
+ ((char2 & 0x3F) << 6) |
+ ((char3 & 0x3F) << 0));
+ break;
+ default:
+ /* 10xx xxxx, 1111 xxxx */
+ throw new AssumptionException(
+ "malformed input around byte " + count);
}
-
-
-// if (!((c >= 0x0001) && (c <= 0x007F))) {
-// } else {
-// }
-//
-// if ((c >= 0x0001) && (c <= 0x007F)) {
-// bytearr[byteIndex++] = (byte)( c );
-// } else if (c > 0x07FF) {
-// bytearr[byteIndex++] = (byte)(0xE0 | ((c >> 12) & 0x0F));
-// bytearr[byteIndex++] = (byte)(0x80 | ((c >> 6) & 0x3F));
-// bytearr[byteIndex++] = (byte)(0x80 | ((c >> 0) & 0x3F));
-// } else {
-// bytearr[byteIndex++] = (byte)(0xC0 | ((c >> 6) & 0x1F));
-// bytearr[byteIndex++] = (byte)(0x80 | ((c >> 0) & 0x3F));
-// }
-// }
-
-
}
- return new String(chars, 0, i);
+
+ // The number of chars produced may be less than utflen
+ return new String(chararr, 0, chararr_count);
}
-
+
}
Code Review / simantics / platform.git / blobdiff