Fixed two issues related to feature extraction (#261)

* Fixed two issues related to extraction:

- Initialisation of Writers now takes place in construction
- DatabaseConfig.getSelectorSupplier() now respects selector config instead of writer config.

* Bumped version.

Former-commit-id: 0930826

build.gradle

@@ -11,7 +11,7 @@ allprojects {
     group = 'org.vitrivr'
 
     /* Our current version, on dev branch this should always be release+1-SNAPSHOT */
-    version = '3.7.0'
+    version = '3.7.3'
 
     apply plugin: 'java-library'
     apply plugin: 'maven-publish'

cineast-core/src/main/java/org/vitrivr/cineast/core/config/DatabaseConfig.java

@@ -100,6 +100,6 @@ public Supplier<EntityCreator> getEntityCreatorSupplier() {
   }
 
   public DBSelectorSupplier getSelectorSupplier() {
-    return this.writer.getSelectorSupplier(this);
+    return this.selector.getSelectorSupplier(this);
   }
 }

cineast-core/src/main/java/org/vitrivr/cineast/core/db/dao/writer/MediaObjectMetadataWriter.java

@@ -17,15 +17,13 @@ public MediaObjectMetadataWriter(PersistencyWriter<?> writer) {
   public MediaObjectMetadataWriter(PersistencyWriter<?> writer, String tableName) {
     super(writer);
     this.tableName = tableName;
-    this.init();
-  }
-
-  @Override
-  protected void init() {
     this.writer.setFieldNames(MediaObjectMetadataDescriptor.FIELDNAMES);
     this.writer.open(tableName);
   }
 
+  @Override
+  protected void init() {}
+
   @Override
   protected PersistentTuple generateTuple(MediaObjectMetadataDescriptor entity) {
     if (entity.getValueProvider() instanceof NothingProvider) {

cineast-core/src/main/java/org/vitrivr/cineast/core/db/dao/writer/MediaObjectWriter.java

@@ -9,16 +9,15 @@ public class MediaObjectWriter extends AbstractBatchedEntityWriter<MediaObjectDe
 
   public MediaObjectWriter(PersistencyWriter<?> writer) {
     super(writer);
+    this.writer.setFieldNames(MediaObjectDescriptor.FIELDNAMES);
+    this.writer.open(MediaObjectDescriptor.ENTITY);
   }
 
   /**
    *
    */
   @Override
-  protected void init() {
-    this.writer.setFieldNames(MediaObjectDescriptor.FIELDNAMES);
-    this.writer.open(MediaObjectDescriptor.ENTITY);
-  }
+  protected void init() { }
 
   @Override
   protected PersistentTuple generateTuple(MediaObjectDescriptor entity) {

cineast-core/src/main/java/org/vitrivr/cineast/core/db/dao/writer/MediaSegmentWriter.java

@@ -9,14 +9,13 @@ public class MediaSegmentWriter extends AbstractBatchedEntityWriter<MediaSegment
 
   public MediaSegmentWriter(PersistencyWriter<?> writer) {
     super(writer);
-  }
-
-  @Override
-  protected void init() {
     this.writer.setFieldNames(MediaSegmentDescriptor.FIELDNAMES);
     this.writer.open(MediaSegmentDescriptor.ENTITY);
   }
 
+  @Override
+  protected void init() { }
+
   @Override
   protected PersistentTuple generateTuple(MediaSegmentDescriptor entity) {
     return this.writer.generateTuple(entity.getSegmentId(), entity.getObjectId(), entity.getSequenceNumber(), entity.getStart(), entity.getEnd(), entity.getStartabs(), entity.getEndabs());