com.blazegraph.gremlin.structure.EmptyBlazeVertexProperty 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.StringFactory;
import org.apache.tinkerpop.gremlin.structure.util.empty.EmptyVertexProperty;
import org.openrdf.model.URI;
import com.bigdata.rdf.model.BigdataBNode;
import com.blazegraph.gremlin.util.CloseableIterator;
/**
* Wanted to extend TP3's {@link EmptyVertexProperty}, but it's final.
*
* @author mikepersonick
*/
public class EmptyBlazeVertexProperty extends BlazeVertexProperty {
@SuppressWarnings("rawtypes")
public static final EmptyBlazeVertexProperty INSTANCE = new EmptyBlazeVertexProperty<>();
@SuppressWarnings("unchecked")
public static BlazeVertexProperty instance() {
return INSTANCE;
}
private EmptyBlazeVertexProperty() {
super();
}
@Override
public BigdataBNode rdfId() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public URI rdfLabel() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public String label() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public int hashCode() {
return 987654321;
}
@Override
public boolean equals(Object object) {
return object instanceof EmptyBlazeVertexProperty;
}
@Override
public BlazeVertex element() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public String id() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public BlazeGraph graph() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public BlazeProperty property(String key) {
return EmptyBlazeProperty.instance();
}
@Override
public BlazeProperty property(String key, U value) {
return EmptyBlazeProperty.instance();
}
@Override
public String key() {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public V value() throws NoSuchElementException {
throw Property.Exceptions.propertyDoesNotExist();
}
@Override
public boolean isPresent() {
return false;
}
@Override
public void remove() {
}
@Override
public String toString() {
return StringFactory.propertyString(this);
}
@Override
public CloseableIterator> properties(String... propertyKeys) {
return CloseableIterator.emptyIterator();
}
}