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A graph pattern matcher for Neo4j.
/*
* Copyright (c) 2002-2017 "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
{
/**
* The default {@link PatternGroup}.
*/
// Should this really EVER be used? - mutable global state!!!!
public static final PatternGroup DEFAULT_PATTERN_GROUP = new PatternGroup()
/*{
@Override
public void addFilter( FilterExpression regexRepression )
{
throw new UnsupportedOperationException(
"Cannot add filter to default pattern group." );
};
}*/;
private LinkedList relationships =
new LinkedList();
private LinkedList optionalRelationships =
new LinkedList();
private final PatternGroup group;
/**
* Create a new pattern node in the default {@link PatternGroup} with a
* blank label.
*/
public PatternNode()
{
this( DEFAULT_PATTERN_GROUP, "" );
}
/**
* Create a new pattern node in the default {@link PatternGroup} with the
* specified label.
*
* @param label the label of this pattern node.
*/
public PatternNode( String label )
{
this( DEFAULT_PATTERN_GROUP, label );
}
/**
* Create a new pattern node in the specified {@link PatternGroup} with a
* blank label.
*
* @param group the {@link PatternGroup} of this pattern node.
*/
public PatternNode( PatternGroup group )
{
this( group, "" );
}
/**
* Create a new pattern node in the specified {@link PatternGroup} with the
* specified label.
*
* @param group the {@link PatternGroup} of this pattern node.
* @param label the label of this pattern node.
*/
public PatternNode( PatternGroup group, String label )
{
this.group = group;
this.label = label;
}
/**
* Get the {@link PatternGroup} of this pattern node.
*
* @return the {@link PatternGroup} this pattern node belongs to.
*/
public PatternGroup getGroup()
{
return this.group;
}
/**
* Get all {@link PatternRelationship}s associated with this pattern node.
* This includes both the required and the optional
* {@link PatternRelationship}s.
*
* @return the {@link PatternRelationship}s associated with this pattern
* node.
*/
public Iterable getAllRelationships()
{
LinkedList allRelationships =
new LinkedList();
allRelationships.addAll( relationships );
allRelationships.addAll( optionalRelationships );
return allRelationships;
}
/**
* Get the optional or the required {@link PatternRelationship}s associated
* with this pattern node.
*
* @param optional if true return only the optional
* {@link PatternRelationship}s, else return only the required.
* @return the set of optional or required {@link PatternRelationship}s.
*/
public Iterable getRelationships( boolean optional )
{
return optional ? optionalRelationships : relationships;
}
void addRelationship( PatternRelationship relationship, boolean optional )
{
if ( optional )
{
optionalRelationships.add( relationship );
}
else
{
relationships.add( relationship );
}
}
void removeRelationship(
PatternRelationship relationship, boolean optional )
{
if ( optional )
{
optionalRelationships.remove( relationship );
}
else
{
relationships.remove( relationship );
}
}
/**
* Create a directed, required {@link PatternRelationship} from this node,
* to the specified other node.
*
* @param otherNode the node at the other end of the relationship.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createRelationshipTo(
PatternNode otherNode )
{
return this.createRelationshipTo( otherNode, false, true );
}
/**
* Create a required {@link PatternRelationship} between this node and the
* specified other node, with the specified direction.
*
* @param otherNode the node at the other end of the relationship.
* @param dir the direction of the relationship. Use
* {@link Direction#OUTGOING} to create a relationship from this
* node to the other node. Use {@link Direction#INCOMING} to
* create a relationship from the other node to this node. Use
* {@link Direction#BOTH} to create a relationship where the
* direction does not matter.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createRelationshipTo(
PatternNode otherNode, Direction dir )
{
if ( dir == Direction.INCOMING )
return otherNode.createRelationshipTo( this );
return this.createRelationshipTo( otherNode, false,
dir == Direction.BOTH ? false : true );
}
/**
* Create a directed, required {@link PatternRelationship} of the specified
* {@link RelationshipType} from this node to the specified other node.
*
* @param otherNode the node at the other end of the relationship.
* @param type the {@link RelationshipType} of the relationship.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createRelationshipTo(
PatternNode otherNode, RelationshipType type )
{
return this.createRelationshipTo( otherNode, type, false, true );
}
/**
* Create a required {@link PatternRelationship} of the specified
* {@link RelationshipType} between this node and the specified other node,
* with the specified direction.
*
* @param otherNode the node at the other end of the relationship.
* @param type the {@link RelationshipType} of the relationship.
* @param dir the direction of the relationship. Use
* {@link Direction#OUTGOING} to create a relationship from this
* node to the other node. Use {@link Direction#INCOMING} to
* create a relationship from the other node to this node. Use
* {@link Direction#BOTH} to create a relationship where the
* direction does not matter.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createRelationshipTo(
PatternNode otherNode, RelationshipType type, Direction dir )
{
if ( dir == Direction.INCOMING )
return otherNode.createRelationshipTo( this, type );
return this.createRelationshipTo( otherNode, type, false,
dir == Direction.BOTH ? false : true );
}
/**
* Create a directed, optional {@link PatternRelationship} from this node,
* to the specified other node.
*
* @param otherNode the node at the other end of the relationship.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createOptionalRelationshipTo(
PatternNode otherNode )
{
return this.createRelationshipTo( otherNode, true, true );
}
/**
* Create an optional {@link PatternRelationship} between this node and the
* specified other node, with the specified direction.
*
* @param otherNode the node at the other end of the relationship.
* @param dir the direction of the relationship. Use
* {@link Direction#OUTGOING} to create a relationship from this
* node to the other node. Use {@link Direction#INCOMING} to
* create a relationship from the other node to this node. Use
* {@link Direction#BOTH} to create a relationship where the
* direction does not matter.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createOptionalRelationshipTo(
PatternNode otherNode, Direction dir )
{
return this.createRelationshipTo( otherNode, true,
dir == Direction.BOTH ? false : true );
}
/**
* Create a directed, optional {@link PatternRelationship} of the specified
* {@link RelationshipType} from this node to the specified other node.
*
* @param otherNode the node at the other end of the relationship.
* @param type the {@link RelationshipType} of the relationship.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createOptionalRelationshipTo(
PatternNode otherNode, RelationshipType type )
{
return this.createRelationshipTo( otherNode, type, true, true );
}
/**
* Create an optional {@link PatternRelationship} of the specified
* {@link RelationshipType} between this node and the specified other node,
* with the specified direction.
*
* @param otherNode the node at the other end of the relationship.
* @param type the {@link RelationshipType} of the relationship.
* @param dir the direction of the relationship. Use
* {@link Direction#OUTGOING} to create a relationship from this
* node to the other node. Use {@link Direction#INCOMING} to
* create a relationship from the other node to this node. Use
* {@link Direction#BOTH} to create a relationship where the
* direction does not matter.
* @return the newly created {@link PatternRelationship}.
*/
public PatternRelationship createOptionalRelationshipTo(
PatternNode otherNode, RelationshipType type, Direction dir )
{
return this.createRelationshipTo( otherNode, type, true,
dir == Direction.BOTH ? false : true );
}
PatternRelationship createRelationshipTo( PatternNode otherNode,
boolean optional, boolean directed )
{
PatternRelationship relationship =
new PatternRelationship( this, otherNode, optional, directed );
addRelationship( relationship, optional );
otherNode.addRelationship( relationship, optional );
return relationship;
}
PatternRelationship createRelationshipTo(
PatternNode otherNode, RelationshipType type, boolean optional,
boolean directed )
{
PatternRelationship relationship =
new PatternRelationship( type, this, otherNode, optional, directed );
addRelationship( relationship, optional );
otherNode.addRelationship( relationship, optional );
return relationship;
}
@Override
public String toString()
{
return this.label;
}
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