/*
 * (C) Copyright 2015-2016, by Alexey Kudinkin and Contributors.
 *
 * JGraphT : a free Java graph-theory library
 *
 * This program and the accompanying materials are dual-licensed under
 * either
 *
 * (a) the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation, or (at your option) any
 * later version.
 *
 * or (per the licensee's choosing)
 *
 * (b) the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation.
 */
package org.jgrapht.alg.interfaces;

import java.util.*;


/**
 * Allows to derive <a
 * href="https://en.wikipedia.org/wiki/Maximum_flow_problem">maximum-flow</a>
 * from the supplied <a href="https://en.wikipedia.org/wiki/Flow_network">flow
 * network</a>
 *
 * @author Alexey Kudinkin
 * @author Joris Kinable
 *
 * @param <V> vertex concept type
 * @param <E> edge concept type
 *
 * @TODO: Rename buildMaximumFlow(V source, V sink) to getMaximumFlow(V source, V sink)
 */
public interface MaximumFlowAlgorithm<V, E>
{
    /**
     * Sets current source to <tt>source</tt>, current sink to <tt>sink</tt>,
     * then calculates maximum flow from <tt>source</tt> to <tt>sink</tt>.
     * Returns an object containing detailed information about the flow.
     *
     * @param source source of the flow inside the network
     * @param sink sink of the flow inside the network
     *
     * @return maximum flow
     */
    MaximumFlow<E> buildMaximumFlow(V source, V sink);

    /**
     * Sets current source to <tt>source</tt>, current sink to <tt>sink</tt>,
     * then calculates maximum flow from <tt>source</tt> to <tt>sink</tt>. Note,
     * that <tt>source</tt> and <tt>sink</tt> must be vertices of the <tt>
     * network</tt> passed to the constructor, and they must be different.
     *
     * @param source source vertex
     * @param sink sink vertex
     */
    default double calculateMaximumFlow(V source,V sink){
        return buildMaximumFlow(source, sink).getValue();
    }


    /**
     * Returns maximum flow value, that was calculated during last <tt>
     * calculateMaximumFlow</tt> call.
     *
     * NOTE: this function currently has a default implementation to guarantee backwards compatibility. This function should be
     * enforced in teh next version.
     *
     * @return maximum flow value
     */
    default double getMaximumFlowValue(){
        throw new UnsupportedOperationException("Function not implemented");
    }

    /**
     * Returns maximum flow, that was calculated during last <tt>
     * calculateMaximumFlow</tt> call, or <tt>null</tt>, if there was no <tt>
     * calculateMaximumFlow</tt> calls.
     *
     * NOTE: this function currently has a default implementation to guarantee backwards compatibility. This function should be
     * enforced in teh next version.
     *
     * @return <i>read-only</i> mapping from edges to doubles - flow values
     * @deprecated Use {@link #getFlowMap()} instead
     */
    default Map<E, Double> getMaximumFlow(){
        return getFlowMap();
    }

    /**
     * Returns maximum flow, that was calculated during last <tt>
     * calculateMaximumFlow</tt> call, or <tt>null</tt>, if there was no <tt>
     * calculateMaximumFlow</tt> calls.
     *
     * NOTE: this function currently has a default implementation to guarantee backwards compatibility. This function should be
     * enforced in teh next version.
     *
     * @return <i>read-only</i> mapping from edges to doubles - flow values
     */
    default Map<E, Double> getFlowMap(){
        throw new UnsupportedOperationException("Function not implemented");
    }


    /**
     * Returns the direction of the flow on an edge (u,v). In case (u,v) is a directed edge (arc), this function will always
     * return the edge target v. However, if (u,v) is an edge in an undirected graph, flow may go through the edge in either side.
     * If the flow goes from u to v, we return v, otherwise u. If the flow on an edge equals 0, the returned value has no meaning.
     *
     * NOTE: this function currently has a default implementation to guarantee backwards compatibility. This function should be
     * enforced in teh next version.
     *
     * @param e edge
     * @return the vertex where the flow leaves the edge
     */
    default V getFlowDirection(E e){
        throw new UnsupportedOperationException("Function not implemented");
    }


    interface MaximumFlow<E>
    {
        /**
         * Returns value of the maximum-flow for the given network
         *
         * @return value of th maximum-flow
         */
        Double getValue();

        /**
         * Returns mapping from edge to flow value through this particular edge
         *
         * @return maximum flow
         */
        Map<E, Double> getFlow();
    }

    class MaximumFlowImpl<E>
        implements MaximumFlow<E>
    {
        private Double value;
        private Map<E, Double> flow;

        public MaximumFlowImpl(Double value, Map<E, Double> flow)
        {
            this.value = value;
            this.flow = Collections.unmodifiableMap(flow);
        }

        @Override public Double getValue()
        {
            return value;
        }

        @Override public Map<E, Double> getFlow()
        {
            return flow;
        }

        @Override
        public String toString(){
            return "Flow Value: "+value+"\nFlow map:\n"+flow;
        }
    }
}

// End MaximumFlowAlgorithm.java

@@ -2264,34 +2264,34 @@
  * enforced in t
-e
 h
+e
  next version.%0A 
@@ -2803,34 +2803,34 @@
  * enforced in t
-e
 h
+e
  next version.%0A 
@@ -3392,34 +3392,34 @@
  * enforced in t
-e
 h
+e
  next version.%0A 
@@ -4188,10 +4188,10 @@
 in t
-e
 h
+e
  nex

Fix typo