/*
* 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.directory.server.core.event;
import org.apache.directory.server.i18n.I18n;
import org.apache.directory.shared.ldap.model.entry.Entry;
import org.apache.directory.shared.ldap.model.exception.LdapException;
import org.apache.directory.shared.ldap.model.exception.LdapInvalidSearchFilterException;
import org.apache.directory.shared.ldap.model.filter.AndNode;
import org.apache.directory.shared.ldap.model.filter.BranchNode;
import org.apache.directory.shared.ldap.model.filter.ExprNode;
import org.apache.directory.shared.ldap.model.filter.NotNode;
import org.apache.directory.shared.ldap.model.filter.OrNode;
import org.apache.directory.shared.ldap.model.name.Dn;
import org.apache.directory.shared.ldap.model.schema.SchemaManager;
/**
* Top level filter expression evaluator implementation.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class ExpressionEvaluator implements Evaluator
{
/** Leaf Evaluator flyweight use for leaf filter assertions */
private LeafEvaluator leafEvaluator;
// ------------------------------------------------------------------------
// C O N S T R U C T O R S
// ------------------------------------------------------------------------
/**
* Creates a top level Evaluator where leaves are delegated to a leaf node
* evaluator which is already provided.
*
* @param leafEvaluator handles leaf node evaluation.
*/
public ExpressionEvaluator( LeafEvaluator leafEvaluator )
{
this.leafEvaluator = leafEvaluator;
}
/**
* Creates a top level Evaluator where leaves are delegated to a leaf node
* evaluator which will be created.
*
* @param schemaManager The server schemaManager
*/
public ExpressionEvaluator( SchemaManager schemaManager )
{
SubstringEvaluator substringEvaluator = null;
substringEvaluator = new SubstringEvaluator();
// leafEvaluator = new LeafEvaluator( schemaManager, substringEvaluator );
leafEvaluator = new LeafEvaluator( substringEvaluator );
}
/**
* Gets the leaf evaluator used by this top level expression evaluator.
*
* @return the leaf evaluator used by this top level expression evaluator
*/
public LeafEvaluator getLeafEvaluator()
{
return leafEvaluator;
}
// ------------------------------------------------------------------------
// Evaluator.evaluate() implementation
// ------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public boolean evaluate( ExprNode node, Dn dn, Entry entry ) throws LdapException
{
if ( node.isLeaf() )
{
return leafEvaluator.evaluate( node, dn, entry );
}
BranchNode bnode = ( BranchNode ) node;
if ( bnode instanceof OrNode )
{
for ( ExprNode child: bnode.getChildren() )
{
if ( evaluate( child, dn, entry ) )
{
return true;
}
}
return false;
}
else if ( bnode instanceof AndNode)
{
for ( ExprNode child: bnode.getChildren() )
{
boolean res = evaluate( child, dn, entry );
if ( !res )
{
return false;
}
}
return true;
}
else if ( bnode instanceof NotNode)
{
if ( null != bnode.getFirstChild() )
{
return !evaluate( bnode.getFirstChild(), dn, entry );
}
throw new LdapInvalidSearchFilterException( I18n.err( I18n.ERR_243, node ) );
}
else
{
throw new LdapInvalidSearchFilterException( I18n.err( I18n.ERR_244, bnode ) );
}
}
}