Added some comments

src/main/java/kieker/gui/common/domain/StatisticType.java

@@ -17,7 +17,7 @@
 package kieker.gui.common.domain;
 
 /**
- * This enumeration shows the available statistics (and their datatype) which can be added for example to traces or operation calls.
+ * This enumeration shows the available statistics (and their datatype) which can be added  for example to traces or operation calls.
  * 
  * @author Nils Christian Ehmke
  */

src/main/java/kieker/gui/common/model/importer/stages/AbstractStage.java

@@ -19,6 +19,16 @@ package kieker.gui.common.model.importer.stages;
 import teetime.framework.AbstractConsumerStage;
 import teetime.framework.OutputPort;
 
+/**
+ * This is a abstract base for {@code TeeTime} stages with exactly one input and one output port.
+ * 
+ * @author Nils Christian Ehmke
+ * 
+ * @param <I>
+ *            The type of the input port.
+ * @param <O>
+ *            The type of the output port.
+ */
 public abstract class AbstractStage<I, O> extends AbstractConsumerStage<I> {
 
 	private final OutputPort<O> outputPort = super.createOutputPort();

src/main/java/kieker/gui/common/model/importer/stages/FailedTraceFilter.java

@@ -18,6 +18,14 @@ package kieker.gui.common.model.importer.stages;
 
 import kieker.gui.common.domain.AbstractTrace;
 
+/**
+ * This stage filters incoming traces and forwards only those which are failed.
+ * 
+ * @author Nils Christian Ehmke
+ * 
+ * @param <T>
+ *            The precise type of the incoming and outgoing traces.
+ */
 public final class FailedTraceFilter<T extends AbstractTrace> extends AbstractStage<T, T> {
 
 	@Override

src/main/java/kieker/gui/common/model/importer/stages/FailureContainingTraceFilter.java

@@ -18,6 +18,14 @@ package kieker.gui.common.model.importer.stages;
 
 import kieker.gui.common.domain.AbstractTrace;
 
+/**
+ * This stage filters incoming traces and forwards only those which are failed or contain a failure in the call tree.
+ * 
+ * @author Nils Christian Ehmke
+ * 
+ * @param <T>
+ *            The precise type of the incoming and outgoing traces.
+ */
 public final class FailureContainingTraceFilter<T extends AbstractTrace> extends AbstractStage<T, T> {
 
 	@Override

src/main/java/kieker/gui/common/model/importer/stages/ReadingComposite.java

@@ -34,6 +34,11 @@ import teetime.stage.InitialElementProducer;
 import teetime.stage.className.ClassNameRegistryRepository;
 import teetime.stage.io.filesystem.Dir2RecordsFilter;
 
+/**
+ * This is a composite stage which deserializes monitoring records from a specific directory and forwards them to the output port.
+ * 
+ * @author Nils Christian Ehmke
+ */
 public final class ReadingComposite extends Stage {
 
 	private final InitialElementProducer<File> producer;

src/main/java/kieker/gui/common/model/importer/stages/TraceAggregator.java

@@ -25,7 +25,7 @@ import kieker.gui.common.domain.AggregatedTrace;
 import kieker.gui.common.domain.Trace;
 
 /**
- * Aggregates incoming traces into trace equivalence classes.
+ * This stage aggregates incoming traces into trace equivalence classes.
  * 
  * @author Nils Christian Ehmke
  */

src/main/java/kieker/gui/common/model/importer/stages/TraceReconstructor.java

@@ -31,8 +31,8 @@ import kieker.gui.common.domain.OperationCall;
 import kieker.gui.common.domain.Trace;
 
 /**
- * Reconstruct traces based on the incoming instances of {@code IFlowRecord}. Currently only {@link TraceMetadata}, {@link BeforeOperationEvent} and
- * {@link AfterOperationEvent} instances are supported.
+ * Reconstruct traces based on the incoming instances of {@code IFlowRecord}. Currently only {@link TraceMetadata}, {@link BeforeOperationEvent} and {@link AfterOperationEvent}
+ * instances are supported.
  * 
  * @author Nils Christian Ehmke
  */