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PathLinkMatcher.java
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PathLinkMatcher.java
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/*
* Copyright (c) 2002-2016 "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 cypher.feature.parser.matchers;
import org.neo4j.graphdb.Relationship;
public class PathLinkMatcher implements ValueMatcher
{
private final RelationshipMatcher relMatcher;
private final NodeMatcher leftNode;
private NodeMatcher rightNode;
private final boolean outgoing;
public PathLinkMatcher( RelationshipMatcher relMatcher, NodeMatcher leftNode, boolean outgoing )
{
this.relMatcher = relMatcher;
this.leftNode = leftNode;
this.outgoing = outgoing;
}
@Override
public boolean matches( Object value )
{
if ( value instanceof Relationship )
{
Relationship real = (Relationship) value;
if ( !relMatcher.matches( real ) )
{
return false;
}
if ( outgoing )
{
if ( !leftNode.matches( real.getStartNode() ) || !rightNode.matches( real.getEndNode() ) )
{
return false;
}
}
// incoming
else if ( !leftNode.matches( real.getEndNode() ) || !rightNode.matches( real.getStartNode() ) )
{
return false;
}
return true;
}
return false;
}
public void setRightNode( NodeMatcher rightNode )
{
this.rightNode = rightNode;
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
sb.append( leftNode ).append( (outgoing ? "-" : "<-") );
sb.append( relMatcher ).append( (outgoing ? "->" : "-") );
sb.append( rightNode );
return sb.toString();
}
}