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diff --git a/sqlelements/src/main/java/org/israfil/sqlelements/constraints/ColumnConstraint.java b/sqlelements/src/main/java/org/israfil/sqlelements/constraints/ColumnConstraint.java
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+++ b/sqlelements/src/main/java/org/israfil/sqlelements/constraints/ColumnConstraint.java
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+/*
+ * SQLElements object-oriented SQL parsing and generation library
+ * 
+ * Copyright (c) 2003, 2004, 2005 Israfil Consulting Services Corporation
+ * Copyright (c) 2003, 2004, 2005 Christian Edward Gruber
+ * All Rights Reserved
+ * 
+ *  This library is free software; you can redistribute it and/or modify 
+ *  it under the terms of the GNU Lesser General Public License as published 
+ *  by the Free Software Foundation; either version 2.1 of the License, or 
+ *  (at your option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
+ * OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License 
+ *  along with this library; if not, please visit http://www.gnu.org/licenses/lgpl.html
+ *
+ * $Id: ColumnConstraint.java 21 2005-12-10 21:40:45Z cgruber $
+ */
+package org.israfil.sqlelements.constraints;
+
+import org.israfil.sqlelements.Column;
+import org.israfil.sqlelements.render.SQLRenderContext;
+
+
+/**
+ * A constraint wrapper for a column.  It's used internally by 
+ * the library to ease implementation of column-oriented
+ * constraints such as "Equals", etc.
+ * 
+ * @see BinaryConstraint
+ * @see Equals
+ * 
+ * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
+ * @author Latest: $Author: cgruber $
+ * @version $Revision: 21 $
+ */
+class ColumnConstraint implements SimpleConstraint
+{
+    Column column;
+    public Column getColumn() { return column; } 
+
+    public ColumnConstraint(Column column) 
+    {
+        this.column = column;
+    }
+    
+    public String render(SQLRenderContext context)
+    {
+        if (column.getTable() != null) 
+        {
+            return context.getAlias(column.getTable()) + "." + column.render(context);
+        }
+        else return column.render(context);
+    }
+}
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