From c8f31f36dd277fb819e5aa632459170de2162f41 Mon Sep 17 00:00:00 2001
From: James Ahlborn <jtahlborn@yahoo.com>
Date: Mon, 4 Jun 2018 03:17:48 +0000
Subject: [PATCH] allow col validator to get this column by name

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/branches/exprs@1161 f203690c-595d-4dc9-a70b-905162fa7fd2
---
 .../jackcess/impl/ColValidatorEvalContext.java       | 12 ++++++++++++
 .../jackcess/impl/ColumnImpl.java                    |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/src/main/java/com/healthmarketscience/jackcess/impl/ColValidatorEvalContext.java b/src/main/java/com/healthmarketscience/jackcess/impl/ColValidatorEvalContext.java
index f5b490e..f55aa17 100644
--- a/src/main/java/com/healthmarketscience/jackcess/impl/ColValidatorEvalContext.java
+++ b/src/main/java/com/healthmarketscience/jackcess/impl/ColValidatorEvalContext.java
@@ -20,6 +20,8 @@ import java.io.IOException;
 
 import com.healthmarketscience.jackcess.Column;
 import com.healthmarketscience.jackcess.InvalidValueException;
+import com.healthmarketscience.jackcess.expr.EvalException;
+import com.healthmarketscience.jackcess.expr.Identifier;
 import com.healthmarketscience.jackcess.expr.Value;
 import com.healthmarketscience.jackcess.impl.expr.Expressionator;
 import com.healthmarketscience.jackcess.util.ColumnValidator;
@@ -66,6 +68,16 @@ public class ColValidatorEvalContext extends ColEvalContext
     return toValue(_val, getCol().getType());
   }
 
+  @Override
+  public Value getIdentifierValue(Identifier identifier) {
+    // col validators can only get "this" column, but they can refer to it by
+    // name
+    if(!getCol().isThisColumn(identifier)) {
+      throw new EvalException("Cannot access other fields for " + identifier);
+    }
+    return getThisColumnValue();
+  }
+
   private Object validate(Column col, Object val) throws IOException {
     try {
       _val = val;
diff --git a/src/main/java/com/healthmarketscience/jackcess/impl/ColumnImpl.java b/src/main/java/com/healthmarketscience/jackcess/impl/ColumnImpl.java
index 3063863..f195b12 100644
--- a/src/main/java/com/healthmarketscience/jackcess/impl/ColumnImpl.java
+++ b/src/main/java/com/healthmarketscience/jackcess/impl/ColumnImpl.java
@@ -50,6 +50,7 @@ import com.healthmarketscience.jackcess.Table;
 import com.healthmarketscience.jackcess.complex.ComplexColumnInfo;
 import com.healthmarketscience.jackcess.complex.ComplexValue;
 import com.healthmarketscience.jackcess.complex.ComplexValueForeignKey;
+import com.healthmarketscience.jackcess.expr.Identifier;
 import com.healthmarketscience.jackcess.impl.complex.ComplexValueForeignKeyImpl;
 import com.healthmarketscience.jackcess.util.ColumnValidator;
 import com.healthmarketscience.jackcess.util.SimpleColumnValidator;
@@ -2014,6 +2015,11 @@ public class ColumnImpl implements Column, Comparable<ColumnImpl> {
     return withErrorContext(msg, getDatabase(), getTable().getName(), getName());
   }
 
+  boolean isThisColumn(Identifier identifier) {
+    return(getTable().isThisTable(identifier) &&
+           identifier.getObjectName().equalsIgnoreCase(getName()));
+  }
+
   private static String withErrorContext(
       String msg, DatabaseImpl db, String tableName, String colName) {
     return msg + " (Db=" + db.getName() + ";Table=" + tableName + ";Column=" +
-- 
2.39.5