com.blazegraph.gremlin.structure.BlazeProperty Maven / Gradle / Ivy
/**
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.structure;
import java.util.NoSuchElementException;
import org.apache.tinkerpop.gremlin.structure.Property;
import org.apache.tinkerpop.gremlin.structure.util.ElementHelper;
import org.apache.tinkerpop.gremlin.structure.util.StringFactory;
import org.openrdf.model.Literal;
import org.openrdf.model.URI;
/**
* Concrete property implementation for Blazegraph. BlazeProperties are
* attached to {@link BlazeEdge}s and {@link BlazeVertexProperty}s
* (meta-properties).
*
* @author mikepersonick
*/
public class BlazeProperty implements Property {
/**
* {@link BlazeGraph} instance this property belongs to.
*/
protected final BlazeGraph graph;
/**
* The {@link BlazeValueFactory} provided by the graph for round-tripping
* values.
*/
protected final BlazeValueFactory vf;
/**
* The {@link BlazeElement} this property belongs to.
*/
protected final BlazeElement element;
/**
* RDF representation of the property key.
*/
protected final URI key;
/**
* RDF representation of the property value.
*/
protected final Literal val;
/**
* Solely for {@link EmptyBlazeProperty}.
*/
protected BlazeProperty() {
this.graph = null;
this.vf = null;
this.element = null;
this.key = null;
this.val = null;
}
BlazeProperty(final BlazeGraph graph, final BlazeElement element,
final URI key, final Literal val) {
this.graph = graph;
this.vf = graph.valueFactory();
this.element = element;
this.key = key;
this.val = val;
}
public BlazeGraph graph() {
return graph;
}
/**
* RDF representation of the property key.
*/
public URI rdfKey() {
return key;
}
/**
* RDF representation of the property value.
*/
public Literal rdfValue() {
return val;
}
/**
* The {@link BlazeElement} this property belongs to.
*/
@Override
public BlazeElement element() {
return element;
}
/**
* @see Property#key()
*/
@Override
public String key() {
return vf.fromURI(key);
}
/**
* @see Property#value()
*/
@Override
@SuppressWarnings("unchecked")
public V value() throws NoSuchElementException {
return (V) vf.fromLiteral(val);
}
/**
* @see Property#isPresent()
*/
@Override
public boolean isPresent() {
return true;
}
/**
* @see Property#remove()
* @see BlazeGraph#remove(BlazeProperty)
*/
@Override
public void remove() {
graph.remove(this);
}
/**
* Pass through to {@link ElementHelper#areEqual(Property, Object)}
*/
@Override
public boolean equals(final Object object) {
return ElementHelper.areEqual(this, object);
}
/**
* Pass through to {@link ElementHelper#hashCode(Property)}
*/
@Override
public int hashCode() {
return ElementHelper.hashCode(this);
}
/**
* Pass through to {@link StringFactory#propertyString(Property)}
*/
@Override
public String toString() {
return StringFactory.propertyString(this);
}
}