EntityListSerializer.java

package nebula.data.json;

import java.util.ArrayList;
import java.util.List;

import nebula.data.Entity;
import nebula.data.impl.EditableEntity;

import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;

public class EntityListSerializer extends DefaultFieldSerializer<List<Entity>> {
	public EntityListSerializer(String fieldName, String frontName, EntitySerializer entityMerger) {
		super(fieldName, frontName);
		this.entityMerger = entityMerger;
	}

	final EntitySerializer entityMerger;

	@Override
	public void input(JsonParser in, Entity parent, List<Entity> current) throws Exception {
		if (current == null) {
			inputWithoutCheck(in, parent);
		}

		List<Entity> newlyList = new ArrayList<Entity>();

		JsonToken token;
		token = in.getCurrentToken();
		assert token == JsonToken.START_ARRAY;

		boolean dirty = false;
//		int i = 0;
		while ((token = in.nextToken()) != JsonToken.END_ARRAY) {
			Entity newly = entityMerger.doReadInList(in, current);
//			long idx = (long) newly.get("_idx"); // TODO Not realized remove when no data changed
//			if (idx != i) {
//				newly.put("_idx", idx);
//				dirty = true;
//			}
			dirty = newly.isDirty() || dirty;
		}
		
		for(Entity entity : current){
			entity.put("_IDX", newlyList.size());
			String action =(String) entity.get("_STS");
			if("D".equals(action)){
				continue;
			}
			newlyList.add(entity);
		}
		assert token == JsonToken.END_ARRAY;

		if (dirty) {
			parent.put(fieldName, newlyList);
		}

	}

	@Override
	public void inputWithoutCheck(JsonParser in, Entity parent) throws Exception {
		List<Entity> vList = new ArrayList<Entity>();
		JsonToken token;
		token = in.getCurrentToken();
		assert token == JsonToken.START_ARRAY;

		while ((token = in.nextToken()) != JsonToken.END_ARRAY) {
			Entity newly = entityMerger.doReadWithoutCheck(in, new EditableEntity());
			vList.add(newly);
		}
		assert token == JsonToken.END_ARRAY;

		parent.put(fieldName, vList);
	}

	@Override
	public void output(JsonGenerator gen, List<Entity> current) throws Exception {
		gen.writeStartArray();

		if (current != null) {
			for (int i = 0; i < current.size(); i++) {
				Entity entity = current.get(i);
				entity.put("_IDX", i);
				entityMerger.outputInList(gen, entity);
			}
		}

		gen.writeEndArray();

	}
}