/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tinkerpop.gremlin.structure.util.detached;
import org.apache.tinkerpop.gremlin.structure.Element;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.Property;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.structure.util.Attachable;
import org.apache.tinkerpop.gremlin.structure.util.ElementHelper;
import org.apache.tinkerpop.gremlin.structure.util.empty.EmptyGraph;
import java.io.Serializable;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* @author Stephen Mallette (http://stephen.genoprime.com)
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public abstract class DetachedElement<E> implements Element, Serializable, Attachable<E> {
protected Object id;
protected String label;
protected Map<String, List<? extends Property>> properties = null;
protected DetachedElement() {
}
protected DetachedElement(final Element element) {
this.id = element.id();
try {
this.label = element.label();
} catch (final UnsupportedOperationException e) { // ghetto.
this.label = Vertex.DEFAULT_LABEL;
}
}
protected DetachedElement(final Object id, final String label) {
this.id = id;
this.label = label;
}
@Override
public Graph graph() {
return EmptyGraph.instance();
}
@Override
public Object id() {
return this.id;
}
@Override
public String label() {
return this.label;
}
@Override
public <V> Property<V> property(final String key, final V value) {
throw Element.Exceptions.propertyAdditionNotSupported();
}
@Override
public <V> Property<V> property(final String key) {
return null != this.properties && this.properties.containsKey(key) ? this.properties.get(key).get(0) : Property.empty();
}
@Override
public int hashCode() {
return ElementHelper.hashCode(this);
}
@SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
@Override
public boolean equals(final Object object) {
return ElementHelper.areEqual(this, object);
}
@Override
public <V> Iterator<? extends Property<V>> properties(final String... propertyKeys) {
return null == this.properties ?
Collections.emptyIterator() :
(Iterator) this.properties.entrySet().stream().filter(entry -> ElementHelper.keyExists(entry.getKey(), propertyKeys)).flatMap(entry -> entry.getValue().stream()).iterator();
}
public E get() {
return (E) this;
}
}