/*
* #%L
* =====================================================
* _____ _ ____ _ _ _ _
* |_ _|_ __ _ _ ___| |_ / __ \| | | | ___ | | | |
* | | | '__| | | / __| __|/ / _` | |_| |/ __|| |_| |
* | | | | | |_| \__ \ |_| | (_| | _ |\__ \| _ |
* |_| |_| \__,_|___/\__|\ \__,_|_| |_||___/|_| |_|
* \____/
*
* =====================================================
*
* Hochschule Hannover
* (University of Applied Sciences and Arts, Hannover)
* Faculty IV, Dept. of Computer Science
* Ricklinger Stadtweg 118, 30459 Hannover, Germany
*
* Email: trust@f4-i.fh-hannover.de
* Website: http://trust.f4.hs-hannover.de/
*
* This file is part of visitmeta-dataservice, version 0.6.0,
* implemented by the Trust@HsH research group at the Hochschule Hannover.
* %%
* Copyright (C) 2012 - 2016 Trust@HsH
* %%
* Licensed 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.
* #L%
*/
package de.hshannover.f4.trust.visitmeta.persistence;
import de.hshannover.f4.trust.visitmeta.interfaces.GraphType;
/**
* Interface for deeper queries against the underlying data.
*
* @author Johannes Busch
*
*/
public interface Executor {
/**
* Returns a number of all current elements in the graph. Elements are
* specified by the given type.
*
* @return
*/
public long count(GraphType type);
/**
* Returns a number of all elements in the graph at the given timestamp.
* Elements are specified by the given type.
*
* @param type
* @param timestamp
* @return
*/
public long count(GraphType type, long timestamp);
/**
* Returns a number of all elements in the graph in the given delta.
* Elements are specified by the given type.
*
* @param type
* @param from
* @param to
* @return
*/
public long count(GraphType type, long from, long to);
/**
* Returns the mean of edges in the graph. Beware: It does not count actual
* links. It counts metadata on a given link. If one link has several
* metadata, the link will be counted multiple times!
*
* @return
*/
public double meanOfEdges();
/**
* Returns the mean of edges in the graph. Beware: It does not count actual
* links. It counts metadata on a given link. If one link has several
* metadata, the link will be counted multiple times!
*
* @return
*/
public double meanOfEdges(long timestamp);
}