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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright (C) 2016 The Guava Authors
 *
 * 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.
 */

package com.google.common.graph;

import static com.google.common.base.Preconditions.checkState;
import static com.google.common.graph.GraphConstants.INNER_CAPACITY;
import static com.google.common.graph.GraphConstants.INNER_LOAD_FACTOR;

import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Multiset;
import com.google.errorprone.annotations.concurrent.LazyInit;
import java.lang.ref.Reference;
import java.lang.ref.SoftReference;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.annotation.CheckForNull;

/**
 * An implementation of {@link NetworkConnections} for directed networks with parallel edges.
 *
 * @author James Sexton
 * @param  Node parameter type
 * @param  Edge parameter type
 */
@ElementTypesAreNonnullByDefault
final class DirectedMultiNetworkConnections extends AbstractDirectedNetworkConnections {

  private DirectedMultiNetworkConnections(
      Map inEdges, Map outEdges, int selfLoopCount) {
    super(inEdges, outEdges, selfLoopCount);
  }

  static  DirectedMultiNetworkConnections of() {
    return new DirectedMultiNetworkConnections<>(
        new HashMap(INNER_CAPACITY, INNER_LOAD_FACTOR),
        new HashMap(INNER_CAPACITY, INNER_LOAD_FACTOR),
        0);
  }

  static  DirectedMultiNetworkConnections ofImmutable(
      Map inEdges, Map outEdges, int selfLoopCount) {
    return new DirectedMultiNetworkConnections<>(
        ImmutableMap.copyOf(inEdges), ImmutableMap.copyOf(outEdges), selfLoopCount);
  }

  @CheckForNull @LazyInit private transient Reference> predecessorsReference;

  @Override
  public Set predecessors() {
    return Collections.unmodifiableSet(predecessorsMultiset().elementSet());
  }

  private Multiset predecessorsMultiset() {
    Multiset predecessors = getReference(predecessorsReference);
    if (predecessors == null) {
      predecessors = HashMultiset.create(inEdgeMap.values());
      predecessorsReference = new SoftReference<>(predecessors);
    }
    return predecessors;
  }

  @CheckForNull @LazyInit private transient Reference> successorsReference;

  @Override
  public Set successors() {
    return Collections.unmodifiableSet(successorsMultiset().elementSet());
  }

  private Multiset successorsMultiset() {
    Multiset successors = getReference(successorsReference);
    if (successors == null) {
      successors = HashMultiset.create(outEdgeMap.values());
      successorsReference = new SoftReference<>(successors);
    }
    return successors;
  }

  @Override
  public Set edgesConnecting(N node) {
    return new MultiEdgesConnecting(outEdgeMap, node) {
      @Override
      public int size() {
        return successorsMultiset().count(node);
      }
    };
  }

  @Override
  public N removeInEdge(E edge, boolean isSelfLoop) {
    N node = super.removeInEdge(edge, isSelfLoop);
    Multiset predecessors = getReference(predecessorsReference);
    if (predecessors != null) {
      checkState(predecessors.remove(node));
    }
    return node;
  }

  @Override
  public N removeOutEdge(E edge) {
    N node = super.removeOutEdge(edge);
    Multiset successors = getReference(successorsReference);
    if (successors != null) {
      checkState(successors.remove(node));
    }
    return node;
  }

  @Override
  public void addInEdge(E edge, N node, boolean isSelfLoop) {
    super.addInEdge(edge, node, isSelfLoop);
    Multiset predecessors = getReference(predecessorsReference);
    if (predecessors != null) {
      checkState(predecessors.add(node));
    }
  }

  @Override
  public void addOutEdge(E edge, N node) {
    super.addOutEdge(edge, node);
    Multiset successors = getReference(successorsReference);
    if (successors != null) {
      checkState(successors.add(node));
    }
  }

  @CheckForNull
  private static  T getReference(@CheckForNull Reference reference) {
    return (reference == null) ? null : reference.get();
  }
}