Skeleton for infrastructure to collect aggregation trees

git-svn-id: https://develop.sub.uni-goettingen.de/repos/textgrid/trunk/services/aggregator@14087 7c539038-3410-0410-b1ec-0f2a7bf1c452

src/main/java/info/textgrid/services/aggregator/tree/Aggregation.java

+package info.textgrid.services.aggregator.tree;
+
+import info.textgrid.namespaces.metadata.core._2010.ObjectType;
+
+public class Aggregation extends AggregationEntry {
+
+	public Aggregation(final ObjectType metadata) {
+		super(metadata);
+	}
+
+}

src/main/java/info/textgrid/services/aggregator/tree/AggregationEntry.java

+package info.textgrid.services.aggregator.tree;
+
+import info.textgrid.namespaces.metadata.core._2010.ObjectType;
+
+
+public class AggregationEntry {
+
+	private final ObjectType metadata;
+
+	public AggregationEntry(final ObjectType metadata) {
+		this.metadata = metadata;
+	}
+
+	public ObjectType getMetadata() {
+		return metadata;
+	}
+
+}

src/main/java/info/textgrid/services/aggregator/tree/AggregationTreeFactory.java

+package info.textgrid.services.aggregator.tree;
+
+import info.textgrid.namespaces.metadata.core._2010.ObjectType;
+import info.textgrid.services.aggregator.AggregationTreeWalker;
+
+import java.util.Deque;
+
+import com.google.common.collect.Lists;
+
+public class AggregationTreeFactory extends AggregationTreeWalker {
+
+	private final Deque<AggregationEntry> stack = Lists.newLinkedList();
+	private final Aggregation root;
+
+	protected AggregationTreeFactory(final ObjectType root) {
+		super();
+		this.root = new Aggregation(root);
+		stack.push(this.root);
+		walkAggregation(root, false);
+	}
+
+	@Override
+	protected boolean walk(final ObjectType object, final boolean again) {
+		// TODO Auto-generated method stub
+		return super.walk(object, again);
+	}
+
+	@Override
+	protected void walkAggregation(final ObjectType aggregation,
+			final boolean again) {
+		// TODO Auto-generated method stub
+		super.walkAggregation(aggregation, again);
+	}
+
+}