Add getType implementations for most of RA/RAI classes.

Author: hanslovsky

src/main/java/net/imglib2/converter/read/BiConvertedRandomAccessible.java

@@ -107,4 +107,9 @@ public C getDestinationType()
 	{
 		return converterSupplier.get();
 	}
+
+	@Override
+	public C getType() {
+		return converted.createVariable();
+	}
 }

src/main/java/net/imglib2/converter/read/BiConvertedRandomAccessibleInterval.java

@@ -116,4 +116,9 @@ public C getDestinationType()
 	{
 		return converterSupplier.get();
 	}
+
+	@Override
+	public C getType() {
+		return converted.createVariable();
+	}
 }

src/main/java/net/imglib2/converter/read/ConvertedRandomAccessibleInterval.java

@@ -103,4 +103,9 @@ public B getDestinationType()
 	{
 		return converterSupplier.get();
 	}
+
+	@Override
+	public B getType() {
+		return converted.createVariable();
+	}
 }

src/main/java/net/imglib2/converter/readwrite/WriteConvertedRandomAccessible.java

@@ -38,6 +38,7 @@
 
 import net.imglib2.Interval;
 import net.imglib2.RandomAccessible;
+import net.imglib2.Sampler;
 import net.imglib2.converter.AbstractConvertedRandomAccessible;
 
 /**
@@ -74,4 +75,31 @@ public WriteConvertedRandomAccess< A, B > randomAccess( final Interval interval
 	{
 		return new WriteConvertedRandomAccess< A, B >( source.randomAccess( interval ), converterSupplier );
 	}
+
+	@Override
+	public B getType() {
+		return converterSupplier.get().convert( ( Sampler< ? extends A > ) new ConstantSampler( getSource().getType() ) );
+	}
+
+	private static class ConstantSampler< T > implements Sampler< T >
+	{
+
+		private final T t;
+
+		public ConstantSampler( T t ) {
+			this.t = t;
+		}
+
+		@Override
+		public T get()
+		{
+			return t;
+		}
+
+		@Override
+		public Sampler< T > copy()
+		{
+			return new ConstantSampler<>( t );
+		}
+	}
 }

src/main/java/net/imglib2/converter/readwrite/WriteConvertedRandomAccessibleInterval.java

@@ -39,6 +39,7 @@
 import net.imglib2.AbstractWrappedInterval;
 import net.imglib2.Interval;
 import net.imglib2.RandomAccessibleInterval;
+import net.imglib2.Sampler;
 
 /**
  * TODO
@@ -74,4 +75,31 @@ public WriteConvertedRandomAccess< A, B > randomAccess( final Interval interval
 	{
 		return new WriteConvertedRandomAccess< A, B >( sourceInterval.randomAccess( interval ), converterSupplier );
 	}
+
+	@Override
+	public B getType() {
+		return converterSupplier.get().convert( ( Sampler< ? extends A > ) new ConstantSampler( getSource().getType() ) );
+	}
+
+	private static class ConstantSampler< T > implements Sampler< T >
+	{
+
+		private final T t;
+
+		public ConstantSampler( T t ) {
+			this.t = t;
+		}
+
+		@Override
+		public T get()
+		{
+			return t;
+		}
+
+		@Override
+		public Sampler< T > copy()
+		{
+			return new ConstantSampler<>( t );
+		}
+	}
 }

src/main/java/net/imglib2/histogram/DiscreteFrequencyDistribution.java

@@ -366,4 +366,9 @@ public DiscreteFrequencyDistribution copy()
 		return new DiscreteFrequencyDistribution( counts.copy() );
 	}
 
+	@Override
+	public LongType getType() {
+		return new LongType();
+	}
+
 }

src/main/java/net/imglib2/histogram/Histogram1d.java

@@ -721,6 +721,10 @@ public Histogram1d< T > copy()
 		return new Histogram1d< T >( this );
 	}
 
+	public LongType getType() {
+		return new LongType();
+	}
+
 	// -- helpers --
 
 	private void reset()

src/main/java/net/imglib2/histogram/HistogramNd.java

@@ -1020,6 +1020,11 @@ public HistogramNd< T > copy()
 		return new HistogramNd< T >( this );
 	}
 
+	@Override
+	public LongType getType() {
+		return new LongType();
+	}
+
 	// -- helpers --
 
 	private void reset()

src/main/java/net/imglib2/position/FunctionRandomAccessible.java

@@ -109,4 +109,9 @@ public FunctionRandomAccess randomAccess( final Interval interval )
 	{
 		return randomAccess();
 	}
+
+	@Override
+	public T getType() {
+		return super.typeSupplier.get();
+	}
 }

src/main/java/net/imglib2/position/PositionRandomAccessible.java

@@ -108,4 +108,9 @@ public RandomAccess< LongType > randomAccess( final Interval interval )
 	{
 		return randomAccess();
 	}
+
+	@Override
+	public LongType getType() {
+		return new LongType();
+	}
 }