/**
* Copyright (c) 2002-2013 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.cypherdsl.querydsl;
import javax.annotation.Nullable;
import com.mysema.query.lucene.LuceneSerializer;
import com.mysema.query.types.Constant;
import com.mysema.query.types.FactoryExpression;
import com.mysema.query.types.Operation;
import com.mysema.query.types.Ops;
import com.mysema.query.types.ParamExpression;
import com.mysema.query.types.Path;
import com.mysema.query.types.Predicate;
import com.mysema.query.types.SubQueryExpression;
import com.mysema.query.types.TemplateExpression;
import com.mysema.query.types.Visitor;
import org.neo4j.cypherdsl.CypherQuery;
import org.neo4j.cypherdsl.Identifier;
import org.neo4j.cypherdsl.Property;
import org.neo4j.cypherdsl.expression.BooleanExpression;
import org.neo4j.cypherdsl.expression.Expression;
import org.neo4j.cypherdsl.expression.NumericExpression;
import org.neo4j.cypherdsl.expression.StringExpression;
import org.neo4j.cypherdsl.query.Value;
/**
* Methods here are used to integrate Cypher DSL with the QueryDSL library. Create QBeans with QueryDSL
* and use those as parameters for these methods, which can then be used with the regular Cypher DSL methods.
*/
public class CypherQueryDSL
extends CypherQuery
{
private static final LuceneSerializer luceneSerializer = new LuceneSerializer( true, true );
// Additional QueryDSL methods
public static Identifier identifier( Path<?> entityPath )
{
return identifier( entityPath.getMetadata().getElement().toString() );
}
public static Property property( Path<?> entityPath )
{
return identifier( entityPath.getRoot().toString() ).property( entityPath.getMetadata().getElement()
.toString() );
}
public static StringExpression string( Path<?> entityPath )
{
return identifier( entityPath.getRoot().toString() ).string( entityPath.getMetadata().getElement()
.toString() );
}
public static NumericExpression number( Path<?> entityPath )
{
return identifier( entityPath.getRoot().toString() ).number( entityPath.getMetadata().getElement()
.toString() );
}
public static String toQuery( Predicate query )
{
return luceneSerializer.toQuery( query, null ).toString();
}
public static BooleanExpression toBooleanExpression( Predicate predicate )
{
return predicate.accept( new Visitor<BooleanExpression, BooleanExpression>()
{
@Override
public BooleanExpression visit( Constant<?> constant,
@Nullable BooleanExpression booleanExpression
)
{
return null;
}
@Override
public BooleanExpression visit( FactoryExpression<?> factoryExpression,
@Nullable BooleanExpression booleanExpression
)
{
return null;
}
@Override
public BooleanExpression visit( Operation<?> operation,
@Nullable BooleanExpression booleanExpression
)
{
String id = operation.getOperator().getId();
if ( id.equals( Ops.AND.getId() ) )
{
return and( operation.getArg( 0 ).accept( this, null ), operation.getArg( 1 )
.accept( this, null ) );
}
else if ( id.equals( Ops.OR.getId() ) )
{
return or( operation.getArg( 0 ).accept( this, null ), operation.getArg( 1 )
.accept( this, null ) );
}
else if ( id.equals( Ops.NOT.getId() ) )
{
return not( operation.getArg( 0 ).accept( this, null ) );
}
else if ( id.equals( Ops.EQ.getId() ) )
{
return arg( operation.getArg( 0 ) ).eq( (StringExpression) arg( operation.getArg( 1 ) ) );
}
else if ( id.equals( Ops.NE.getId() ) )
{
return arg( operation.getArg( 0 ) ).ne( (StringExpression) arg( operation.getArg( 1 ) ) );
}
else if ( id.equals( Ops.GT.getId() ) )
{
return arg( operation.getArg( 0 ) ).gt( (StringExpression) arg( operation.getArg( 1 ) ) );
}
else if ( id.equals( Ops.LT.getId() ) )
{
return arg( operation.getArg( 0 ) ).lt( (StringExpression) arg( operation.getArg( 1 ) ) );
}
else if ( id.equals( Ops.GOE.getId() ) )
{
return arg( operation.getArg( 0 ) ).gte( (StringExpression) arg( operation.getArg( 1 ) ) );
}
else if ( id.equals( Ops.LOE.getId() ) )
{
return arg( operation.getArg( 0 ) ).lte( (StringExpression) arg( operation.getArg( 1 ) ) );
}
else if ( id.equals( Ops.EXISTS.getId() ) )
{
return has( (Expression) arg( operation.getArg( 0 ) ) );
}
else if ( id.equals( Ops.IS_NULL.getId() ) )
{
return isNull( (Expression) arg( operation.getArg( 0 ) ) );
}
else if ( id.equals( Ops.IS_NOT_NULL.getId() ) )
{
return isNotNull( (Expression) arg( operation.getArg( 0 ) ) );
}
else if ( id.equals( Ops.LIKE.getId() ) )
{
return arg( operation.getArg( 0 ) ).regexp( arg( operation.getArg( 1 ) ) );
}
else
{
throw new IllegalArgumentException( "Unknown operator:" + id + " in expression " + operation );
}
}
@Override
public BooleanExpression visit( ParamExpression<?> paramExpression,
@Nullable BooleanExpression booleanExpression
)
{
return null;
}
@Override
public BooleanExpression visit( Path<?> path,
@Nullable BooleanExpression booleanExpression
)
{
return null;
}
@Override
public BooleanExpression visit( SubQueryExpression<?> subQueryExpression,
@Nullable BooleanExpression booleanExpression
)
{
return null;
}
@Override
public BooleanExpression visit( TemplateExpression<?> templateExpression,
@Nullable BooleanExpression booleanExpression
)
{
return null;
}
public Value arg( com.mysema.query.types.Expression expression )
{
if ( expression instanceof Constant )
{
return new Value( literal( ((Constant) expression).getConstant() ) );
}
else if ( expression instanceof ParamExpression )
{
return new Value( param( ((ParamExpression) expression).getName() ) );
}
else if ( expression instanceof Path )
{
Path path = (Path) expression;
return new Value( identifier( path.getRoot() ).string( path.getMetadata().getElement()
.toString() ) );
}
else
{
throw new IllegalArgumentException( "Unknown argument type:" + expression );
}
}
}, null );
}
}