package foundation.dao.version;

import java.util.List;

import foundation.json.IJSONWriter;
import foundation.util.MapList;

public class EntityChange implements IDataChange {

	private String dataName;
	private ChangeType changeType;
	private MapList<String, FieldChange> fieldChanges;
	
	
	public EntityChange(String dataName) {
		this.dataName = dataName;
		fieldChanges = new MapList<String, FieldChange>();
	}
	
	public void addOneFieldChange(String fieldName, ChangeType changeType, Object oneValue, Object anotherValue, String oneJSON, String anotherJSON) {
		FieldChange change = new FieldChange(fieldName, changeType, oneValue, anotherValue, oneJSON, anotherJSON);
		fieldChanges.add(fieldName, change);
	}

	public void setChangeType(ChangeType changeType) {
		this.changeType = changeType;
	}
	
	public String getDataName() {
		return dataName;
	}

	public ChangeType getChangeType() {
		return changeType;
	}
	
	public List<FieldChange> getFieldChanges() {
		return fieldChanges.getItemList();
	}

	public boolean isEmpty() {
		if (!fieldChanges.isEmpty()) {
			return false;
		}
		
		if (changeType != null) {
			return false;
		}
		
		return true;
	}
	
	@Override
	public void writeJSON(IJSONWriter writer) {
		writer.beginObject(dataName);
		
		//1. 变更类型
		writer.write("change_type", changeType.name());
		
		if (ChangeType.NoChange == changeType) {
			writer.endObject();
			return;
		}
		
		//2. 变更的entity
		writer.beginArray("fields");	
		
		for (FieldChange fieldChange: fieldChanges) {
			fieldChange.writeJSON(writer);
		}
		
		writer.endArray();
		
		
		writer.endObject();
	}

}