implement GUID reading using patch from joniles, 1445653; replace StringBuffer from StringBuilder

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@38 f203690c-595d-4dc9-a70b-905162fa7fd2

src/java/com/healthmarketscience/jackcess/ByteUtil.java

@@ -86,29 +86,49 @@ public final class ByteUtil {
    * @return The display String
    */
   public static String toHexString(ByteBuffer buffer, int offset, int size) {
-    
-    StringBuffer rtn = new StringBuffer();
+    return toHexString(buffer, offset, size, true);
+  }    
+
+  /**
+   * Convert a byte buffer to a hexadecimal string for display
+   * @param buffer Buffer to display, starting at offset 0
+   * @param offset Offset at which to start reading the buffer
+   * @param size Number of bytes to read from the buffer
+   * @param formatted flag indicating if formatting is required
+   * @return The display String
+   */
+  public static String toHexString(ByteBuffer buffer,
+                                   int offset, int size, boolean formatted) {
+
+    StringBuilder rtn = new StringBuilder();
     int position = buffer.position();
     buffer.position(offset);
-       
+
     for (int i = 0; i < size; i++) {
       byte b = buffer.get();
       byte h = (byte) (b & 0xF0);
       h = (byte) (h >>> 4);
-      h = (byte) (h & 0x0F);    
+      h = (byte) (h & 0x0F);
+      rtn.append(HEX_CHARS[(int) h]);
+      h = (byte) (b & 0x0F);
       rtn.append(HEX_CHARS[(int) h]);
-      h = (byte) (b & 0x0F);  
-      rtn.append(HEX_CHARS[(int) h] + " ");
-      if ((i + 1) % 4 == 0) {
+
+      if (formatted == true)
+      {
         rtn.append(" ");
-      }
-      if ((i + 1) % 24 == 0) {
-        rtn.append("\n");
+
+        if ((i + 1) % 4 == 0) {
+          rtn.append(" ");
+        }
+        if ((i + 1) % 24 == 0) {
+          rtn.append("\n");
+        }
       }
     }
-    
+
     buffer.position(position);
     return rtn.toString();
-  }    
+  } 
+
   
 }

src/java/com/healthmarketscience/jackcess/Column.java

@@ -308,8 +308,30 @@ public class Column implements Comparable<Column> {
         intVal = intVal.negate();
       }
       return new BigDecimal(intVal, getScale());
+
+    } else if (_type == DataType.GUID) {
+      
+      StringBuilder sb = new StringBuilder(22);
+      sb.append("{");
+      sb.append(ByteUtil.toHexString(buffer, 0, 4,
+                                     false));
+      sb.append("-");
+      sb.append(ByteUtil.toHexString(buffer, 4, 2,
+                                     false));
+      sb.append("-");
+      sb.append(ByteUtil.toHexString(buffer, 6, 2,
+                                     false));
+      sb.append("-");
+      sb.append(ByteUtil.toHexString(buffer, 8, 2,
+                                     false));
+      sb.append("-");
+      sb.append(ByteUtil.toHexString(buffer, 10, 6,
+                                     false));
+      sb.append("}");
+      return (sb.toString());
+      
+    } else if (_type == DataType.UNKNOWN_0D) {
       
-    } else if (_type == DataType.UNKNOWN_0D || _type == DataType.GUID) {
       return null;
     } else {
       throw new IOException("Unrecognized data type: " + _type);
@@ -560,7 +582,9 @@ public class Column implements Comparable<Column> {
       return _format.SIZE_LONG_VALUE_DEF;
     } else if (_type == DataType.NUMERIC) {
       return 17;
-    } else if (_type == DataType.UNKNOWN_0D || _type == DataType.GUID) {
+    } else if (_type == DataType.GUID) {
+      return 16; 
+    } else if (_type == DataType.UNKNOWN_0D) {
       throw new IllegalArgumentException("FIX ME");
     } else {
       throw new IllegalArgumentException("Unrecognized data type: " + _type);
@@ -568,7 +592,7 @@ public class Column implements Comparable<Column> {
   }
   
   public String toString() {
-    StringBuffer rtn = new StringBuffer();
+    StringBuilder rtn = new StringBuilder();
     rtn.append("\tName: " + _name);
     rtn.append("\n\tType: 0x" + Integer.toHexString((int)_type.getValue()));
     rtn.append("\n\tNumber: " + _columnNumber);

src/java/com/healthmarketscience/jackcess/DataType.java

@@ -51,7 +51,7 @@ public enum DataType {
   OLE((byte) 0x0B, Types.LONGVARBINARY, 12),
   MEMO((byte) 0x0C, Types.LONGVARCHAR, 12),
   UNKNOWN_0D((byte) 0x0D),
-  GUID((byte) 0x0F),
+  GUID((byte) 0x0F, null, 16),
   NUMERIC((byte) 0x10, Types.NUMERIC, 17);
 
   /** Map of SQL types to Access data types */
@@ -87,17 +87,18 @@ public enum DataType {
   /** SQL type equivalent, or null if none defined */
   private Integer _sqlType;
   
-  DataType(byte value) {
+  private DataType(byte value) {
     _value = value;
   }
   
-  DataType(byte value, int sqlType, int size) {
+  private DataType(byte value, Integer sqlType, Integer size) {
     this(value);
     _sqlType = sqlType;
     _size = size;
   }
   
-  DataType(byte value, int sqlType, int size, boolean variableLength) {
+  private DataType(byte value, Integer sqlType, Integer size,
+                   boolean variableLength) {
     this(value, sqlType, size);
     _variableLength = variableLength;
   }

src/java/com/healthmarketscience/jackcess/Index.java

@@ -245,7 +245,7 @@ public class Index implements Comparable<Index> {
   }
   
   public String toString() {
-    StringBuffer rtn = new StringBuffer();
+    StringBuilder rtn = new StringBuilder();
     rtn.append("\tName: " + _name);
     rtn.append("\n\tNumber: " + _indexNumber);
     rtn.append("\n\tPage number: " + _pageNumber);
@@ -399,7 +399,7 @@ public class Index implements Comparable<Index> {
       byte flag = buffer.get();
       if (flag != (byte) 0) {
         if (col.getType() == DataType.TEXT) {
-          StringBuffer sb = new StringBuffer();
+          StringBuilder sb = new StringBuilder();
           byte b;
           while ( (b = buffer.get()) != (byte) 1) {
             if ((int) b == 43) {

src/java/com/healthmarketscience/jackcess/Table.java

@@ -537,7 +537,7 @@ public class Table {
   }
   
   public String toString() {
-    StringBuffer rtn = new StringBuffer();
+    StringBuilder rtn = new StringBuilder();
     rtn.append("Type: " + _tableType);
     rtn.append("\nRow count: " + _rowCount);
     rtn.append("\nColumn count: " + _columnCount);
@@ -569,7 +569,7 @@ public class Table {
    */
   public String display(long limit) throws IOException {
     reset();
-    StringBuffer rtn = new StringBuffer();
+    StringBuilder rtn = new StringBuilder();
     Iterator iter = _columns.iterator();
     while (iter.hasNext()) {
       Column col = (Column) iter.next();