0001558: Add the ability to use the old column value to the list of v…

…ariable column transform options
JumpMind · Feb 3, 2014 · 05274bd · 05274bd
1 parent f30d134
commit 05274bd
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Showing 2 changed files with 8 additions and 4 deletions.
diff --git a/symmetric-assemble/src/docbook/configuration.xml b/symmetric-assemble/src/docbook/configuration.xml
@@ -1828,9 +1828,9 @@ is the current system date and time,
 <code>source_node_id</code>
 is the node id of the source,
 <code>target_node_id</code>
-is the node id of the target, and
+is the node id of the target,
 <code>null</code>
-is a null value.
+is a null value, and <code>old_column_value</code> is the column's old value prior to the DML operation.
 </listitem>
 
 <listitem>Additive Transform ('additive'): This

diff --git a/...ic-io/src/main/java/org/jumpmind/symmetric/io/data/transform/VariableColumnTransform.java b/...ic-io/src/main/java/org/jumpmind/symmetric/io/data/transform/VariableColumnTransform.java
@@ -47,8 +47,10 @@ public class VariableColumnTransform implements ISingleValueColumnTransform, IBu
 
     protected static final String OPTION_NULL = "null";
 
+    protected static final String OPTION_OLD_VALUE = "old_column_value";
+
     private static final String[] OPTIONS = new String[] { OPTION_TIMESTAMP, OPTION_DATE,
-            OPTION_SOURCE_NODE_ID, OPTION_TARGET_NODE_ID, OPTION_NULL };
+            OPTION_SOURCE_NODE_ID, OPTION_TARGET_NODE_ID, OPTION_NULL, OPTION_OLD_VALUE };
 
     public String getName() {
         return NAME;
@@ -79,7 +81,9 @@ public String transform(IDatabasePlatform platform,
             } else if (varName.equalsIgnoreCase(OPTION_SOURCE_NODE_ID)) {
                 return context.getBatch().getSourceNodeId();
             } else if (varName.equalsIgnoreCase(OPTION_TARGET_NODE_ID)) {
-                return context.getBatch().getTargetNodeId();                
+                return context.getBatch().getTargetNodeId();   
+            } else if (varName.equalsIgnoreCase(OPTION_OLD_VALUE)) {
+                return oldValue;   
             } else if (varName.equals(OPTION_NULL)) {
                 return null;
             }