@Nullable
public IDirectedGraphRelation getOutgoingRelationTo(@Nullable final IDirectedGraphNode aToNode) {
if (m_aOutgoing != null && aToNode != null)
for (final IDirectedGraphRelation aRelation : m_aOutgoing.values())
if (aRelation.getTo().equals(aToNode)) return aRelation;
return null;
}
@Nullable
public IDirectedGraphRelation getIncomingRelationFrom(
@Nullable final IDirectedGraphNode aFromNode) {
if (m_aIncoming != null && aFromNode != null)
for (final IDirectedGraphRelation aRelation : m_aIncoming.values())
if (aRelation.getFrom().equals(aFromNode)) return aRelation;
return null;
}
@Nonnull
@ReturnsMutableCopy
public Set<IDirectedGraphNode> getAllToNodes() {
final Set<IDirectedGraphNode> ret = new HashSet<IDirectedGraphNode>();
if (m_aOutgoing != null)
for (final IDirectedGraphRelation aRelation : m_aOutgoing.values())
ret.add(aRelation.getTo());
return ret;
}
@Nonnull
@ReturnsMutableCopy
public Set<String> getAllRelatedNodeIDs() {
final Set<String> ret = new LinkedHashSet<String>();
if (m_aIncoming != null)
for (final IDirectedGraphRelation aRelation : m_aIncoming.values())
ret.add(aRelation.getFromID());
if (m_aOutgoing != null)
for (final IDirectedGraphRelation aRelation : m_aOutgoing.values())
ret.add(aRelation.getToID());
return ret;
}
public void addOutgoingRelation(@Nonnull final IDirectedGraphRelation aNewRelation) {
if (aNewRelation == null) throw new NullPointerException("relation");
if (aNewRelation.getFrom() != this)
throw new IllegalArgumentException("Passed outgoing relation is not based on this node");
if (m_aOutgoing != null) {
if (m_aOutgoing.containsKey(aNewRelation.getID()))
throw new IllegalArgumentException(
"The passed relation "
+ aNewRelation
+ " is already contained as an outgoing relation");
// check if the relation to-node is already contained
for (final IDirectedGraphRelation aRelation : m_aOutgoing.values())
if (aRelation.getTo() == aNewRelation.getTo())
throw new IllegalArgumentException(
"The to-node of the passed relation " + aNewRelation + " is already contained");
} else {
m_aOutgoing = new LinkedHashMap<String, IDirectedGraphRelation>();
}
// Add!
m_aOutgoing.put(aNewRelation.getID(), aNewRelation);
}
public boolean isIncomingRelation(@Nullable final IDirectedGraphRelation aRelation) {
return m_aIncoming != null
&& aRelation != null
&& aRelation.equals(m_aIncoming.get(aRelation.getID()));
}
@Nonnull
public EChange removeOutgoingRelation(@Nonnull final IDirectedGraphRelation aRelation) {
return aRelation == null || m_aOutgoing == null
? EChange.UNCHANGED
: EChange.valueOf(m_aOutgoing.remove(aRelation.getID()) != null);
}