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Posted to commits@commons.apache.org by ma...@apache.org on 2012/04/21 14:02:04 UTC
svn commit: r1328639 - in /commons/sandbox/graph/trunk/src:
main/java/org/apache/commons/graph/ main/java/org/apache/commons/graph/flow/
main/java/org/apache/commons/graph/weight/
main/java/org/apache/commons/graph/weight/primitive/ test/java/org/apach...
Author: marcosperanza
Date: Sat Apr 21 12:02:03 2012
New Revision: 1328639
URL: http://svn.apache.org/viewvc?rev=1328639&view=rev
Log:
[SANDBOX-386] Make Graph components Serializable
Added:
commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/GraphSerializationTestCase.java (with props)
Modified:
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/Mapper.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/VertexPair.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/flow/DefaultMaxFlowAlgorithmSelector.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/Monoid.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigDecimalWeightBaseOperations.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigIntegerWeightBaseOperations.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/DoubleWeightBaseOperations.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/FloatWeightBaseOperations.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/IntegerWeightBaseOperations.java
commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/LongWeightBaseOperations.java
commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledEdge.java
commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledVertex.java
commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledWeightedEdge.java
commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseWeightedEdge.java
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/Mapper.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/Mapper.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/Mapper.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/Mapper.java Sat Apr 21 12:02:03 2012
@@ -1,5 +1,7 @@
package org.apache.commons.graph;
+import java.io.Serializable;
+
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
@@ -19,7 +21,7 @@ package org.apache.commons.graph;
* under the License.
*/
-public interface Mapper<I, O>
+public interface Mapper<I, O> extends Serializable
{
O map( I input );
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/VertexPair.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/VertexPair.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/VertexPair.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/VertexPair.java Sat Apr 21 12:02:03 2012
@@ -22,13 +22,16 @@ package org.apache.commons.graph;
import static java.lang.String.format;
import static org.apache.commons.graph.utils.Assertions.checkNotNull;
+import java.io.Serializable;
+
/**
* Indicates a {@link Vertex} pair.
*
* @param <V> the Graph vertices type
*/
-public final class VertexPair<V>
+public final class VertexPair<V> implements Serializable
{
+ private static final long serialVersionUID = 2333503391707156055L;
/** The head vertex. */
private final V head;
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/flow/DefaultMaxFlowAlgorithmSelector.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/flow/DefaultMaxFlowAlgorithmSelector.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/flow/DefaultMaxFlowAlgorithmSelector.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/flow/DefaultMaxFlowAlgorithmSelector.java Sat Apr 21 12:02:03 2012
@@ -167,6 +167,7 @@ final class DefaultMaxFlowAlgorithmSelec
}
+ @SuppressWarnings( "serial" ) //the algorithm isn't serializable.
private static final class MapperWrapper<WE, W, WO extends OrderedMonoid<W>>
implements Mapper<EdgeWrapper<WE>, W>
{
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/Monoid.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/Monoid.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/Monoid.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/Monoid.java Sat Apr 21 12:02:03 2012
@@ -1,5 +1,7 @@
package org.apache.commons.graph.weight;
+import java.io.Serializable;
+
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
@@ -24,7 +26,7 @@ package org.apache.commons.graph.weight;
*
* @param <E> the type of the elements in the {@link Monoid}
*/
-public interface Monoid<E>
+public interface Monoid<E> extends Serializable
{
/**
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigDecimalWeightBaseOperations.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigDecimalWeightBaseOperations.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigDecimalWeightBaseOperations.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigDecimalWeightBaseOperations.java Sat Apr 21 12:02:03 2012
@@ -33,6 +33,8 @@ public class BigDecimalWeightBaseOperati
implements OrderedMonoid<BigDecimal>
{
+ private static final long serialVersionUID = -317234195461348466L;
+
/**
* {@inheritDoc}
*/
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigIntegerWeightBaseOperations.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigIntegerWeightBaseOperations.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigIntegerWeightBaseOperations.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/BigIntegerWeightBaseOperations.java Sat Apr 21 12:02:03 2012
@@ -33,6 +33,8 @@ public class BigIntegerWeightBaseOperati
implements OrderedMonoid<BigInteger>
{
+ private static final long serialVersionUID = 4118152508299694652L;
+
/**
* {@inheritDoc}
*/
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/DoubleWeightBaseOperations.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/DoubleWeightBaseOperations.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/DoubleWeightBaseOperations.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/DoubleWeightBaseOperations.java Sat Apr 21 12:02:03 2012
@@ -28,6 +28,7 @@ import org.apache.commons.graph.weight.O
public class DoubleWeightBaseOperations
implements OrderedMonoid<Double>
{
+ private static final long serialVersionUID = 4440399710792243877L;
/**
* {@inheritDoc}
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/FloatWeightBaseOperations.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/FloatWeightBaseOperations.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/FloatWeightBaseOperations.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/FloatWeightBaseOperations.java Sat Apr 21 12:02:03 2012
@@ -29,6 +29,8 @@ public class FloatWeightBaseOperations
implements OrderedMonoid<Float>
{
+ private static final long serialVersionUID = 8542498901286671169L;
+
/**
* {@inheritDoc}
*/
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/IntegerWeightBaseOperations.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/IntegerWeightBaseOperations.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/IntegerWeightBaseOperations.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/IntegerWeightBaseOperations.java Sat Apr 21 12:02:03 2012
@@ -29,6 +29,8 @@ public class IntegerWeightBaseOperations
implements OrderedMonoid<Integer>
{
+ private static final long serialVersionUID = -8641477350652350485L;
+
/**
* {@inheritDoc}
*/
Modified: commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/LongWeightBaseOperations.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/LongWeightBaseOperations.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/LongWeightBaseOperations.java (original)
+++ commons/sandbox/graph/trunk/src/main/java/org/apache/commons/graph/weight/primitive/LongWeightBaseOperations.java Sat Apr 21 12:02:03 2012
@@ -29,6 +29,8 @@ public class LongWeightBaseOperations
implements OrderedMonoid<Long>
{
+ private static final long serialVersionUID = 3149327896191098756L;
+
/**
* {@inheritDoc}
*/
Modified: commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledEdge.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledEdge.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledEdge.java (original)
+++ commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledEdge.java Sat Apr 21 12:02:03 2012
@@ -22,9 +22,12 @@ package org.apache.commons.graph.model;
import static java.lang.String.format;
import static org.apache.commons.graph.utils.Assertions.checkNotNull;
-public class BaseLabeledEdge
+import java.io.Serializable;
+
+public class BaseLabeledEdge implements Serializable
{
+ private static final long serialVersionUID = -4985890761880816592L;
private final String label;
public BaseLabeledEdge( String label )
Modified: commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledVertex.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledVertex.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledVertex.java (original)
+++ commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledVertex.java Sat Apr 21 12:02:03 2012
@@ -22,9 +22,12 @@ package org.apache.commons.graph.model;
import static java.lang.String.format;
import static org.apache.commons.graph.utils.Assertions.checkNotNull;
-public class BaseLabeledVertex
+import java.io.Serializable;
+
+public class BaseLabeledVertex implements Serializable
{
+ private static final long serialVersionUID = -5167021719818162490L;
private final String label;
public BaseLabeledVertex( String label )
Modified: commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledWeightedEdge.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledWeightedEdge.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledWeightedEdge.java (original)
+++ commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseLabeledWeightedEdge.java Sat Apr 21 12:02:03 2012
@@ -29,6 +29,8 @@ public class BaseLabeledWeightedEdge<W>
extends BaseLabeledEdge
{
+ private static final long serialVersionUID = 5935967858178091436L;
+
private final W weight;
public BaseLabeledWeightedEdge( String label, W weight )
Modified: commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseWeightedEdge.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseWeightedEdge.java?rev=1328639&r1=1328638&r2=1328639&view=diff
==============================================================================
--- commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseWeightedEdge.java (original)
+++ commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/BaseWeightedEdge.java Sat Apr 21 12:02:03 2012
@@ -1,11 +1,15 @@
package org.apache.commons.graph.model;
+import java.io.Serializable;
+
import org.apache.commons.graph.Mapper;
public final class BaseWeightedEdge<W>
- implements Mapper<BaseLabeledWeightedEdge<W>, W>
+ implements Mapper<BaseLabeledWeightedEdge<W>, W>, Serializable
{
+ private static final long serialVersionUID = -2024378704087762740L;
+
public W map( BaseLabeledWeightedEdge<W> edge )
{
return edge.getWeight();
Added: commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/GraphSerializationTestCase.java
URL: http://svn.apache.org/viewvc/commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/GraphSerializationTestCase.java?rev=1328639&view=auto
==============================================================================
--- commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/GraphSerializationTestCase.java (added)
+++ commons/sandbox/graph/trunk/src/test/java/org/apache/commons/graph/model/GraphSerializationTestCase.java Sat Apr 21 12:02:03 2012
@@ -0,0 +1,201 @@
+package org.apache.commons.graph.model;
+
+import static junit.framework.Assert.assertEquals;
+import static org.apache.commons.graph.CommonsGraph.newDirectedMutableGraph;
+import static org.apache.commons.graph.CommonsGraph.newUndirectedMutableGraph;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+import org.apache.commons.graph.CommonsGraph;
+import org.apache.commons.graph.Graph;
+import org.apache.commons.graph.MutableGraph;
+import org.apache.commons.graph.builder.AbstractGraphConnection;
+import org.apache.commons.graph.builder.GraphConnection;
+import org.apache.commons.graph.weight.primitive.DoubleWeightBaseOperations;
+import org.junit.After;
+import org.junit.Test;
+
+/**
+ * Provides a simple test case to test the Graph serialization.
+ */
+public class GraphSerializationTestCase
+{
+
+ private final static String FILE_NAME = "target/serialiazedGraph.dat";
+
+ @After
+ public void cleanUp()
+ {
+ File f = new File( FILE_NAME );
+ if ( f.exists() )
+ {
+ f.delete();
+ }
+ }
+
+ @Test
+ public void serializeUndirectedGraph()
+ throws Exception
+ {
+
+ MutableGraph<BaseLabeledVertex, BaseLabeledEdge> g = newUndirectedMutableGraph( buildGraphConnections() );
+
+ checkSerialization( g );
+ }
+
+ @Test
+ public void serializeDirectedGraph()
+ throws Exception
+ {
+
+ MutableGraph<BaseLabeledVertex, BaseLabeledEdge> g = newDirectedMutableGraph( buildGraphConnections() );
+
+ checkSerialization( g );
+ }
+
+ @Test
+ public void serializeUndirectedWeightdGraph()
+ throws Exception
+ {
+
+ MutableGraph<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>> g =
+ newUndirectedMutableGraph( buildWeightedGraphConnections() );
+
+ checkSerialization( g );
+ }
+
+ @Test
+ public void serializeDirectedWeightdGraph()
+ throws Exception
+ {
+
+ MutableGraph<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>> g =
+ newDirectedMutableGraph( buildWeightedGraphConnections() );
+
+ checkSerialization( g );
+ }
+
+ @Test
+ public void serializeSpanningTree()
+ throws Exception
+ {
+ final MutableSpanningTree<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>, Double> spanningTree =
+ new MutableSpanningTree<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>, Double>(
+ new DoubleWeightBaseOperations(),
+ new BaseWeightedEdge<Double>() );
+
+ CommonsGraph.populate( spanningTree ).withConnections( buildWeightedGraphConnections() );
+
+ checkSerialization( spanningTree );
+ }
+
+ @Test
+ public void serializePath()
+ throws Exception
+ {
+
+ BaseLabeledVertex start = new BaseLabeledVertex( "start" );
+ BaseLabeledVertex goal = new BaseLabeledVertex( "goal" );
+ BaseLabeledVertex a = new BaseLabeledVertex( "a" );
+ BaseLabeledVertex b = new BaseLabeledVertex( "b" );
+ BaseLabeledVertex c = new BaseLabeledVertex( "c" );
+
+ InMemoryWeightedPath<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>, Double> g =
+ new InMemoryWeightedPath<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>, Double>(
+ start,
+ goal,
+ new DoubleWeightBaseOperations(),
+ new BaseWeightedEdge<Double>() );
+
+ g.addConnectionInTail( start, new BaseLabeledWeightedEdge<Double>( "start <-> a", 1.5D ), a );
+ g.addConnectionInTail( a, new BaseLabeledWeightedEdge<Double>( "a <-> b", 2D ), b );
+ g.addConnectionInTail( b, new BaseLabeledWeightedEdge<Double>( "b <-> c", 3D ), c );
+ g.addConnectionInTail( c, new BaseLabeledWeightedEdge<Double>( "c <-> goal", 3D ), goal );
+
+ checkSerialization( g );
+
+ }
+
+ /**
+ * @param g
+ * @throws FileNotFoundException
+ * @throws IOException
+ * @throws ClassNotFoundException
+ */
+ private void checkSerialization( Graph<BaseLabeledVertex, ? extends Serializable> g )
+ throws FileNotFoundException, IOException, ClassNotFoundException
+ {
+ FileOutputStream fout = new FileOutputStream( FILE_NAME );
+ ObjectOutputStream oos = new ObjectOutputStream( fout );
+ oos.writeObject( g );
+ oos.close();
+
+ FileInputStream fin = new FileInputStream( FILE_NAME );
+ ObjectInputStream ois = new ObjectInputStream( fin );
+ Object cloned = ois.readObject();
+ ois.close();
+
+ assertEquals( g, cloned );
+ }
+
+ private GraphConnection<BaseLabeledVertex, BaseLabeledEdge> buildGraphConnections()
+ {
+
+ GraphConnection<BaseLabeledVertex, BaseLabeledEdge> connections =
+ new AbstractGraphConnection<BaseLabeledVertex, BaseLabeledEdge>()
+ {
+ @Override
+ public void connect()
+ {
+ BaseLabeledVertex a = new BaseLabeledVertex( "a" );
+ BaseLabeledVertex b = new BaseLabeledVertex( "b" );
+ BaseLabeledVertex c = new BaseLabeledVertex( "c" );
+ BaseLabeledVertex d = new BaseLabeledVertex( "d" );
+ addVertex( a );
+ addVertex( b );
+ addVertex( c );
+ addVertex( d );
+
+ addEdge( new BaseLabeledEdge( "a -> c" ) ).from( a ).to( c );
+ addEdge( new BaseLabeledEdge( "c -> d" ) ).from( c ).to( d );
+ addEdge( new BaseLabeledEdge( "d -> b" ) ).from( d ).to( b );
+
+ }
+ };
+ return connections;
+ }
+
+ private GraphConnection<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>> buildWeightedGraphConnections()
+ {
+
+ GraphConnection<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>> connections =
+ new AbstractGraphConnection<BaseLabeledVertex, BaseLabeledWeightedEdge<Double>>()
+ {
+ @Override
+ public void connect()
+ {
+ BaseLabeledVertex a = new BaseLabeledVertex( "a" );
+ BaseLabeledVertex b = new BaseLabeledVertex( "b" );
+ BaseLabeledVertex c = new BaseLabeledVertex( "c" );
+ BaseLabeledVertex d = new BaseLabeledVertex( "d" );
+ addVertex( a );
+ addVertex( b );
+ addVertex( c );
+ addVertex( d );
+
+ addEdge( new BaseLabeledWeightedEdge<Double>( "a -> c", 1D ) ).from( a ).to( c );
+ addEdge( new BaseLabeledWeightedEdge<Double>( "c -> d", 1D ) ).from( c ).to( d );
+ addEdge( new BaseLabeledWeightedEdge<Double>( "d -> b", 1D ) ).from( d ).to( b );
+
+ }
+ };
+ return connections;
+ }
+}
\ No newline at end of file
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