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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.das.ldap.schema.emf.destroy;
import java.util.Map;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.BasicAttributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchResult;
import org.apache.tuscany.das.ldap.schema.constants.AttributeTypeConstants;
import org.eclipse.emf.ecore.EClass;
/**
* The Class ECascadingObjectClassDestroyer.
*
* The purose of this class is to destroy a ObjectClass
* that is the parent of other ObjectClass entries.
*
* It first checks to see whether the EClass instance
* is a parent of other EClassifiers by examining
* whether the metaContext contains the EClass
* instance's name.
*
* If the EClass instance has an an metaContext child entry,
* then this instance is a parent of other EClassifiers.
* Therefore we check to see whether there are EClass
* instances left to delete that inherit from this EClass.
*
* If none are left we delete the parentMetaContext entry.
* If there are more children left, we leave the parentMetaContext
* entry in place and delete the children.
*
* If there is no parentMetaEntryContext, it means that this
* EClass instance does not have any children. Therefore it's
* safe to delete the corresponding ObjectClass.
*/
public class ECascadingObjectClassDestroyer
implements AttributeTypeConstants
{
public static void destroy(
Map<String, EClass> eClassNameToEClassMap,
DirContext metaContext,
DirContext attributeTypesContext,
DirContext objectClassesContext,
EClass eClass,
String oidPrefix)
throws NamingException, Exception
{
String rdn =
null;
DirContext eClassParentMetaContext =
null;
try
{
eClassParentMetaContext =
( DirContext )
metaContext.
lookup( CN + "=" + eClass.getName() );
}
catch (Exception e)
{
//This eClass can be deleted, because it is not used a super class.
}
if (eClassParentMetaContext == null)
{
EObjectClassDestroyer.destroy(
metaContext,
attributeTypesContext,
objectClassesContext,
eClass,
oidPrefix );
}
else
{
Attributes searchAttributes =
new BasicAttributes(true);
searchAttributes.put(new BasicAttribute(CN));
NamingEnumeration<SearchResult> childEntries =
eClassParentMetaContext.search("", searchAttributes);
if (childEntries.hasMore())
{
while (childEntries.hasMore())
{
SearchResult childEntry =
childEntries.next();
Attributes childEntryAttributes =
childEntry.getAttributes();
String eClassName =
( String )
childEntryAttributes.get( CN ).get();
EClass childEClass =
eClassNameToEClassMap.get( eClassName );
destroy(
eClassNameToEClassMap,
metaContext,
attributeTypesContext,
objectClassesContext,
childEClass,
oidPrefix );
EObjectClassDestroyer.destroy(
metaContext,
attributeTypesContext,
objectClassesContext,
eClass,
oidPrefix );
rdn = CN + "=" + eClass.getName();
metaContext.destroySubcontext( rdn );
}
}
}
}
}
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