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/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
[email protected]
This program 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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.blazegraph.gremlin.listener;
/**
* An atomic unit of information about a property graph. Analogous to an RDF
* statement- the atomic unit of information about an RDF graph. This is the
* unit of graph information used by the listener and history APIs.
*
* @author mikepersonick
*/
public abstract class BlazeGraphAtom {
/**
* All atoms refer back to an element (Vertex, Edge, or VertexProperty).
*/
protected final String id;
/**
* All atoms refer back to an element (Vertex, Edge, or VertexProperty).
*/
protected BlazeGraphAtom(final String id) {
this.id = id;
}
/**
* The element id (Vertex, Edge, or VertexProperty) this atom refers to.
*/
public String elementId() {
return id;
}
/**
* Abstract base class for VertexAtom and EdgeAtom. Adds the element label.
*
* @author mikepersonick
*/
private static abstract class ElementAtom extends BlazeGraphAtom {
/**
* Element label.
*/
protected final String label;
private ElementAtom(final String id, final String label) {
super(id);
this.label = label;
}
/**
* Element label.
*/
public String label() {
return label;
}
}
/**
* Vertex atom describes a vertex - id and label.
*
* @author mikepersonick
*/
public static class VertexAtom extends ElementAtom {
/**
* Full construct a vertex atom.
*/
public VertexAtom(final String id, final String label) {
super(id, label);
}
/**
* Return the vertex id.
*/
public String vertexId() {
return id;
}
@Override
public String toString() {
return "VertexAtom [id=" + id + ", label=" + label + "]";
}
}
/**
* Edge atom describes an edge - id, label, and from/to (vertex ids).
*
* @author mikepersonick
*/
public static class EdgeAtom extends ElementAtom {
/**
* From vertex id.
*/
private final String fromId;
/**
* To vertex id.
*/
private final String toId;
/**
* Fully construct an edge atom.
*/
public EdgeAtom(final String id, final String label,
final String fromId, final String toId) {
super(id, label);
this.fromId = fromId;
this.toId = toId;
}
/**
* Return the edge id.
*/
public String edgeId() {
return id;
}
/**
* From vertex id.
*/
public String fromId() {
return fromId;
}
/**
* To vertex id.
*/
public String toId() {
return toId;
}
@Override
public String toString() {
return "EdgeAtom [id=" + id + ", label=" + label + ", from=" + fromId + ", to=" + toId + "]";
}
}
/**
* Property atom describes a property on an Edge or VertexProperty -
* element id, key, and value.
*
* @author mikepersonick
*/
public static class PropertyAtom extends BlazeGraphAtom {
/**
* Property key (name).
*/
protected final String key;
/**
* Property value (primitive).
*/
protected final Object val;
/**
* Fully construct a property atom.
*/
public PropertyAtom(final String id, final String key, final Object val) {
super(id);
this.key = key;
this.val = val;
}
/**
* Property key (name).
*/
public String getKey() {
return key;
}
/**
* Property value (primitive).
*/
public Object getVal() {
return val;
}
@Override
public String toString() {
return "PropertyAtom [elementId=" + id + ", key=" + key + ", val=" + val + "]";
}
}
/**
* VertexProperty atom describes a property on a Vertex - vertex id, vertex
* property id, key, value.
*
* @author mikepersonick
*/
public static class VertexPropertyAtom extends PropertyAtom {
/**
* Vertex property id.
*/
private final String vpId;
/**
* Fully construct a vertex property atom.
*/
public VertexPropertyAtom(final String vertexId,
final String key, final Object val, final String vpId) {
super(vertexId, key, val);
this.vpId = vpId;
}
/**
* Return the vertex id.
*/
public String vertexId() {
return id;
}
/**
* Return the vertex property id.
*/
public String vertexPropertyId() {
return vpId;
}
@Override
public String toString() {
return "VertexPropertyAtom [vertexId=" + id + ", key=" + key + ", val=" + val + ", vertexPropertyId=" + vpId + "]";
}
}
}
