support reading/writing fixed length text columns (fixe #2886370)

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@411 f203690c-595d-4dc9-a70b-905162fa7fd2

1 files changed, 35 insertions, 1 deletions

diff --git a/src/java/com/healthmarketscience/jackcess/Column.java b/src/java/com/healthmarketscience/jackcess/Column.java
index a41b450..85ebde0 100644
--- a/src/java/com/healthmarketscience/jackcess/Column.java
+++ b/src/java/com/healthmarketscience/jackcess/Column.java
@@ -345,6 +345,12 @@ public class Column implements Comparable<Column> {
       return;
     }
 
+    if((_autoNumberGenerator != null) && 
+       (_autoNumberGenerator.getType() == _type)) {
+      // keep existing
+      return;
+    }
+
     switch(_type) {
     case LONG:
       _autoNumberGenerator = new LongAutoNumberGenerator();
@@ -1098,7 +1104,7 @@ public class Column implements Comparable<Column> {
   public ByteBuffer writeFixedLengthField(Object obj, ByteOrder order)
     throws IOException
   {
-    int size = getType().getFixedSize();
+    int size = getType().getFixedSize(_columnLength);
 
     // create buffer for data
     ByteBuffer buffer = getPageChannel().createBuffer(size, order);
@@ -1132,6 +1138,19 @@ public class Column implements Comparable<Column> {
     case MONEY:
       writeCurrencyValue(buffer, obj);
       break;
+    case TEXT:
+      // apparently text numeric values are also occasionally written as fixed
+      // length...
+      CharSequence text = toCharSequence(obj);
+      int numChars = getLengthInUnits();
+      if (text.length() != numChars) {
+        throw new IOException(
+            "Text is invalid for fixed length column, length " + numChars
+            + ", got " + text.length());
+      }
+      // force uncompressed encoding for fixed length text
+      buffer.put(encodeUncompressedText(text, getFormat()));
+      break;
     case GUID:
       writeGUIDValue(buffer, obj, order);
       break;
@@ -1538,6 +1557,11 @@ public class Column implements Comparable<Column> {
      * Returns the flags used when writing this column.
      */
     public abstract int getColumnFlags();
+
+    /**
+     * Returns the type of values generated by this generator.
+     */
+    public abstract DataType getType();
   }
 
   private final class LongAutoNumberGenerator extends AutoNumberGenerator
@@ -1560,6 +1584,11 @@ public class Column implements Comparable<Column> {
     public int getColumnFlags() {
       return AUTO_NUMBER_FLAG_MASK;
     }
+
+    @Override
+    public DataType getType() {
+      return DataType.LONG;
+    }
   }
 
   private final class GuidAutoNumberGenerator extends AutoNumberGenerator
@@ -1584,6 +1613,11 @@ public class Column implements Comparable<Column> {
     public int getColumnFlags() {
       return AUTO_NUMBER_GUID_FLAG_MASK;
     }
+
+    @Override
+    public DataType getType() {
+      return DataType.GUID;
+    }
   }
 
 }