/*
* 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.studio.ldapbrowser.core.model.filter.parser;
import java.util.Stack;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapAndFilterComponent;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapFilter;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapFilterComponent;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapFilterExtensibleComponent;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapFilterItemComponent;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapNotFilterComponent;
import org.apache.directory.studio.ldapbrowser.core.model.filter.LdapOrFilterComponent;
/**
* The LdapFilterParser implements a parser for LDAP filters.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class LdapFilterParser
{
/** The scanner. */
private LdapFilterScanner scanner;
/** The filter stack. */
private Stack<LdapFilter> filterStack;
/** The parsed LDAP filter model. */
private LdapFilter model;
/**
* Creates a new instance of LdapFilterParser.
*/
public LdapFilterParser()
{
this.scanner = new LdapFilterScanner();
this.model = new LdapFilter();
}
/**
* Gets the parsed LDAP filter model.
*
* @return the parsed model
*/
public LdapFilter getModel()
{
return model;
}
/**
* Parses the given LDAP filter.
*
* @param ldapFilter the LDAP filter
*/
public void parse( String ldapFilter )
{
// reset state
filterStack = new Stack<LdapFilter>();
scanner.reset( ldapFilter );
model = new LdapFilter();
// handle error tokens before filter
LdapFilterToken token = scanner.nextToken();
while ( token.getType() != LdapFilterToken.LPAR && token.getType() != LdapFilterToken.EOF )
{
handleError( false, token, model );
token = scanner.nextToken();
}
// check filter start
if ( token.getType() == LdapFilterToken.LPAR )
{
// start top level filter
model.setStartToken( token );
filterStack.push( model );
// loop till filter end or EOF
do
{
// next token
token = scanner.nextToken();
switch ( token.getType() )
{
case LdapFilterToken.LPAR:
{
LdapFilter newFilter = new LdapFilter();
newFilter.setStartToken( token );
LdapFilter currentFilter = filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
if ( filterComponent != null && filterComponent.addFilter( newFilter ) )
{
filterStack.push( newFilter );
}
else
{
currentFilter.addOtherToken( token );
}
break;
}
case LdapFilterToken.RPAR:
{
LdapFilter currentFilter = filterStack.pop();
handleError( currentFilter.setStopToken( token ), token, currentFilter );
/*
* if(!filterStack.isEmpty()) { LdapFilter parentFilter =
* (LdapFilter) filterStack.peek(); LdapFilterComponent
* filterComponent = parentFilter.getFilterComponent();
* filterComponent.addFilter(currentFilter); }
*/
break;
}
case LdapFilterToken.AND:
{
LdapFilter currentFilter = filterStack.peek();
LdapAndFilterComponent filterComponent = new LdapAndFilterComponent( currentFilter );
filterComponent.setStartToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
break;
}
case LdapFilterToken.OR:
{
LdapFilter currentFilter = filterStack.peek();
LdapOrFilterComponent filterComponent = new LdapOrFilterComponent( currentFilter );
filterComponent.setStartToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
break;
}
case LdapFilterToken.NOT:
{
LdapFilter currentFilter = filterStack.peek();
LdapNotFilterComponent filterComponent = new LdapNotFilterComponent( currentFilter );
filterComponent.setStartToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
break;
}
case LdapFilterToken.ATTRIBUTE:
{
LdapFilter currentFilter = filterStack.peek();
LdapFilterItemComponent filterComponent = new LdapFilterItemComponent( currentFilter );
filterComponent.setAttributeToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
break;
}
case LdapFilterToken.VALUE:
{
LdapFilter currentFilter = filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
if ( filterComponent instanceof LdapFilterItemComponent )
{
handleError( ( filterComponent instanceof LdapFilterItemComponent )
&& ( ( LdapFilterItemComponent ) filterComponent ).setValueToken( token ), token,
currentFilter );
}
else if ( filterComponent instanceof LdapFilterExtensibleComponent )
{
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent ).setValueToken( token ), token,
currentFilter );
}
else
{
handleError( false, token, currentFilter );
}
break;
}
case LdapFilterToken.EQUAL:
case LdapFilterToken.GREATER:
case LdapFilterToken.LESS:
case LdapFilterToken.APROX:
case LdapFilterToken.PRESENT:
case LdapFilterToken.SUBSTRING:
{
LdapFilter currentFilter = filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
if ( filterComponent instanceof LdapFilterItemComponent )
{
handleError( ( filterComponent instanceof LdapFilterItemComponent )
&& ( ( LdapFilterItemComponent ) filterComponent ).setFiltertypeToken( token ), token,
currentFilter );
}
else if ( filterComponent instanceof LdapFilterExtensibleComponent )
{
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent ).setEqualsToken( token ),
token, currentFilter );
}
else
{
handleError( false, token, currentFilter );
}
break;
}
case LdapFilterToken.WHITESPACE:
{
LdapFilter currentFilter = filterStack.peek();
currentFilter.addOtherToken( token );
break;
}
case LdapFilterToken.EXTENSIBLE_ATTRIBUTE:
{
LdapFilter currentFilter = ( LdapFilter ) filterStack.peek();
LdapFilterExtensibleComponent filterComponent = new LdapFilterExtensibleComponent(
currentFilter );
filterComponent.setAttributeToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
break;
}
case LdapFilterToken.EXTENSIBLE_DNATTR_COLON:
{
LdapFilter currentFilter = ( LdapFilter ) filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
if ( filterComponent == null )
{
filterComponent = new LdapFilterExtensibleComponent( currentFilter );
( ( LdapFilterExtensibleComponent ) filterComponent ).setDnAttrColonToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
}
else
{
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent ).setDnAttrColonToken( token ),
token, currentFilter );
}
break;
}
case LdapFilterToken.EXTENSIBLE_DNATTR:
{
LdapFilter currentFilter = ( LdapFilter ) filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent ).setDnAttrToken( token ), token,
currentFilter );
break;
}
case LdapFilterToken.EXTENSIBLE_MATCHINGRULEOID_COLON:
{
LdapFilter currentFilter = ( LdapFilter ) filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
if ( filterComponent == null )
{
filterComponent = new LdapFilterExtensibleComponent( currentFilter );
( ( LdapFilterExtensibleComponent ) filterComponent ).setMatchingRuleColonToken( token );
handleError( currentFilter.setFilterComponent( filterComponent ), token, currentFilter );
}
else
{
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent )
.setMatchingRuleColonToken( token ), token, currentFilter );
}
break;
}
case LdapFilterToken.EXTENSIBLE_MATCHINGRULEOID:
{
LdapFilter currentFilter = ( LdapFilter ) filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent ).setMatchingRuleToken( token ),
token, currentFilter );
break;
}
case LdapFilterToken.EXTENSIBLE_EQUALS_COLON:
{
LdapFilter currentFilter = ( LdapFilter ) filterStack.peek();
LdapFilterComponent filterComponent = currentFilter.getFilterComponent();
handleError( ( filterComponent instanceof LdapFilterExtensibleComponent )
&& ( ( LdapFilterExtensibleComponent ) filterComponent ).setEqualsColonToken( token ),
token, currentFilter );
break;
}
case LdapFilterToken.EOF:
{
model.addOtherToken( token );
break;
}
default:
{
LdapFilter currentFilter = filterStack.peek();
handleError( false, token, currentFilter );
}
}
}
while ( !filterStack.isEmpty() && token.getType() != LdapFilterToken.EOF );
}
// handle error token after filter
token = scanner.nextToken();
while ( token.getType() != LdapFilterToken.EOF )
{
handleError( false, token, model );
token = scanner.nextToken();
}
}
/**
* Helper method to handle parse errors.
*
* @param success the success flag
* @param filter the filter
* @param token the token
*/
private void handleError( boolean success, LdapFilterToken token, LdapFilter filter )
{
if ( !success )
{
filter.addOtherToken( new LdapFilterToken( LdapFilterToken.ERROR, token.getValue(), token.getOffset() ) );
}
}
}