tuna-master/joern/src/main/java/graphutils/Edge.java
package graphutils;

import java.util.Map;

public abstract class Edge<V> {

    private V destination;
    private V source;

    public Edge(V source, V destination) {
        this.source = source;
        this.destination = destination;
    }

    public V getDestination() {
        return this.destination;
    }

    public V getSource() {
        return this.source;
    }

    public abstract Map<String, Object> getProperties();

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result
                + ((destination == null) ? 0 : destination.hashCode());
        result = prime * result + ((source == null) ? 0 : source.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof Edge)) {
            return false;
        }
        Edge<?> other = (Edge<?>) obj;
        if (destination == null) {
            if (other.destination != null) {
                return false;
            }
        } else if (!destination.equals(other.destination)) {
            return false;
        }
        if (source == null) {
            if (other.source != null) {
                return false;
            }
        } else if (!source.equals(other.source)) {
            return false;
        }
        return true;
    }

}
