[PR #1] Interface should not use the impl instead of the interface

src/main/java/com/datadoghq/trace/Sampler.java

@@ -1,7 +1,7 @@
 package com.datadoghq.trace;
 
 
-import com.datadoghq.trace.impl.DDSpan;
+import io.opentracing.Span;
 
 /**
  * Main interface to sample a collection of traces.
@@ -14,6 +14,6 @@ public interface Sampler {
      * @param span the parent span with its context
      * @return true when the trace/spans has to be reported/written
      */
-    boolean sample(DDSpan span);
+    boolean sample(Span span);
 
 }

src/main/java/com/datadoghq/trace/impl/AllSampler.java

@@ -1,6 +1,7 @@
 package com.datadoghq.trace.impl;
 
 import com.datadoghq.trace.Sampler;
+import io.opentracing.Span;
 
 /**
  * Sampler that always says yes...
@@ -8,7 +9,7 @@ import com.datadoghq.trace.Sampler;
 public class AllSampler implements Sampler {
 
 	@Override
-	public boolean sample(DDSpan span) {
+	public boolean sample(Span span) {
 		return true;
 	}
 

src/main/java/com/datadoghq/trace/impl/RateSampler.java

@@ -2,6 +2,7 @@ package com.datadoghq.trace.impl;
 
 
 import com.datadoghq.trace.Sampler;
+import io.opentracing.Span;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -41,7 +42,7 @@ public class RateSampler implements Sampler {
     }
 
     @Override
-    public boolean sample(DDSpan span) {
+    public boolean sample(Span span) {
         boolean sample = Math.random() <= this.sampleRate;
         logger.debug("{} - Span is sampled: {}", span, sample);
         return sample;