1 files changed, 168 insertions, 0 deletions
diff --git a/das-java/contrib/ldap/das.ldap/src/main/java/org/apache/tuscany/das/ldap/util/JNDIUtil.java b/das-java/contrib/ldap/das.ldap/src/main/java/org/apache/tuscany/das/ldap/util/JNDIUtil.java
new file mode 100644
index 0000000000..be19f0b6c4
--- /dev/null
+++ b/das-java/contrib/ldap/das.ldap/src/main/java/org/apache/tuscany/das/ldap/util/JNDIUtil.java
@@ -0,0 +1,168 @@
+
+package org.apache.tuscany.das.ldap.util;
+
+import javax.naming.NamingException;
+import javax.naming.directory.DirContext;
+
+/**
+ * The Class JNDIUtil.
+ */
+public class JNDIUtil
+{
+    /**
+     * Calculate DN components.
+     * 
+     * @param context the context
+     * 
+     * @return the string[] containing the components of the DN
+     * 
+     * @throws NamingException the naming exception
+     */
+    public static String[] calculateDNComponents(
+        DirContext context) 
+    throws NamingException
+    {
+        String contextDN                  = 
+            context.getNameInNamespace();
+        
+        String[] initialContextComponents = 
+            contextDN.split( "[,]" );
+
+        return initialContextComponents;
+    }
+
+    
+    /**
+     * Calculate DN components.
+     * 
+     * @param contextDN the context DN
+     * 
+     * @return the string[] containing the components of the DN
+     * 
+     * @throws NamingException the naming exception
+     */
+    public static String[] calculateDNComponents(
+        String contextDN) 
+    throws NamingException
+    {
+        String[] initialContextComponents = 
+            contextDN.split( "[,]" );
+
+        return initialContextComponents;
+    }
+    
+    /**
+     * Gets the parent context.
+     * 
+     * @param partitionContext the partition context
+     * @param childContext the child context
+     * 
+     * @return the parent context (Null if the child context is the root)
+     * 
+     * @throws NamingException the naming exception
+     */
+    public static DirContext getParentContext(
+        DirContext childContext, 
+        DirContext partitionContext) 
+    throws NamingException
+    {
+        String[] childContextDNComponents = 
+            calculateDNComponents( childContext );
+        
+        String[] partitionDNComponents    = 
+            calculateDNComponents( partitionContext );
+        
+        DirContext parentContext          = null; 
+        
+        if (childContextDNComponents.length == partitionDNComponents.length)
+        {
+            return null;
+        }
+        else if ( (childContextDNComponents.length - 1) == partitionDNComponents.length)
+        {
+            return partitionContext;
+        }
+        else
+        {
+            String parentLookupDN = 
+                calculateParentRelativeDN( 
+                    childContext, partitionContext.getNameInNamespace() );
+            
+            
+            
+            parentContext = 
+                ( DirContext ) partitionContext.lookup( parentLookupDN );
+        }
+        return parentContext;
+    }
+
+    
+    /**
+     * Calculate parent relative DN.
+     * The parent relative DN is the
+     * DN of the parent context, relative
+     * to the partition context.
+     * 
+     * So if the partition context is
+     * <i>ou=system</i> and
+     * the child context has DN
+     * <i>cn=accounts, cn=users, cn=example, ou=system</i>
+     * 
+     * then the parent relative DN is
+     * <i>cn=users, cn=example</i>
+     * 
+     * @param childContext the child context
+     * @param partitionDN the partition DN
+     * 
+     * @return the string
+     * 
+     * @throws NamingException the naming exception
+     */
+    public static String calculateParentRelativeDN(
+        DirContext childContext, 
+        String partitionDN) 
+    throws NamingException
+    {
+        String parentRelativeDN           = null;
+        
+        String[] childContextDNComponents = 
+            calculateDNComponents( childContext );
+        
+        String[] partitionDNComponents    = 
+            calculateDNComponents( partitionDN );
+        
+        if (childContextDNComponents.length == 
+            partitionDNComponents.length)
+        {
+            return null;
+        }
+        else if (childContextDNComponents.length ==
+             partitionDNComponents.length + 1)
+        {
+            String childRDN            = childContextDNComponents[0];
+            String childContextDN      = childContext.getNameInNamespace();
+            
+            int beginIndex = childRDN.length() + 1;
+            int endIndex   = childContextDN.length();
+
+            parentRelativeDN = childContextDN.substring( 
+                beginIndex, endIndex );
+            
+            return parentRelativeDN;
+        }
+        else
+        {
+            String childRDN            = childContextDNComponents[0];
+            String childContextDN      = childContext.getNameInNamespace();
+            
+            int beginIndex = childRDN.length() + 1;
+            int endIndex   = 
+                childContextDN.length() - 
+                ( partitionDN.length() +1);
+            
+            parentRelativeDN = childContextDN.substring( 
+                beginIndex, endIndex );
+        }
+        return parentRelativeDN;
+    }
+}