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package com.datastax.data.dataset.event;

import com.datastax.data.dataset.DataColumn;
import com.datastax.data.dataset.DataRow;
import com.datastax.data.dataset.DataTable;

import java.util.EventObject;


public class TableChangeEvent extends EventObject {
    public enum EventType {
        LOAD_STARTED,
        LOAD_COMPLETE,
        SAVE_STARTED,
        SAVE_COMPLETE,
        TABLE_CLEARED,
        ROW_ADDED,
        ROW_DELETED,
        ROW_DISCARDED,
        COLUMN_ADDED,
        COLUMN_REMOVED,
        COLUMN_CHANGED
    };
    
    private EventType eventType;
    private DataColumn columnAffected;
    private DataRow rowAffected;
    
    private TableChangeEvent(DataTable source) { super(source); }
    
    
    private TableChangeEvent(DataTable source, EventType what ) {
        super(source);
        eventType = what;
    }
    
    
    private TableChangeEvent(DataTable source, EventType what, DataRow row ) {
        this(source, what);
        rowAffected = row;
    }
    
    
    private TableChangeEvent(DataTable source, EventType what, DataColumn column ) {
        this(source, what);
        columnAffected = column;
    }
    
    public static TableChangeEvent newLoadStartEvent(DataTable source) {
        return new TableChangeEvent(source, EventType.LOAD_STARTED);
    }
    
    public static TableChangeEvent newLoadCompleteEvent(DataTable source) {
        return new TableChangeEvent(source, EventType.LOAD_COMPLETE);
    }

    public static TableChangeEvent newSaveStartEvent(DataTable source) {
        return new TableChangeEvent(source, EventType.SAVE_STARTED);
    }
    
    public static TableChangeEvent newSaveCompleteEvent(DataTable source) {
        return new TableChangeEvent(source, EventType.SAVE_COMPLETE);
    }

    public static TableChangeEvent newTableClearedEvent(DataTable source) {
        return new TableChangeEvent(source, EventType.TABLE_CLEARED);
    }
    
    public static TableChangeEvent newColumnAddedEvent(DataTable source, DataColumn col) {
        return new TableChangeEvent(source, EventType.COLUMN_ADDED, col);
    }

    public static TableChangeEvent newColumnRemovedEvent(DataTable source, DataColumn col) {
        return new TableChangeEvent(source, EventType.COLUMN_REMOVED, col);
    }

    public static TableChangeEvent newColumnChangedEvent(DataTable source, DataColumn col) {
        return new TableChangeEvent(source, EventType.COLUMN_CHANGED, col);
    }

    public static TableChangeEvent newRowAddedEvent(DataTable source, DataRow row) {
        return new TableChangeEvent(source, EventType.ROW_ADDED, row);
    }

    public static TableChangeEvent newRowDeletedEvent(DataTable source, DataRow row) {
        return new TableChangeEvent(source, EventType.ROW_DELETED, row);
    }

    public static TableChangeEvent newRowDiscardedEvent(DataTable source, DataRow row) {
        return new TableChangeEvent(source, EventType.ROW_DISCARDED, row);
    }

    
    public TableChangeEvent.EventType getEventType() {
        return eventType;
    }
    
    
    public DataRow getRowAffected() {
        return rowAffected;
    }
    
    
    public DataColumn getColumnAffected() {
        return columnAffected;
    }

    public String toString() {
        DataTable table = (DataTable) getSource();
        switch (eventType) {
        case LOAD_STARTED:
        case LOAD_COMPLETE:
        case SAVE_STARTED:
        case SAVE_COMPLETE:
        case TABLE_CLEARED:
            return table.getName()+"."+eventType;
        case ROW_ADDED:
        case ROW_DELETED:
        case ROW_DISCARDED:
            return table.getName()+"."+eventType+" "+rowAffected;
        case COLUMN_ADDED:
        case COLUMN_REMOVED:
        case COLUMN_CHANGED:
            return table.getName()+"."+eventType+" "+columnAffected.getName();
        default:
            return super.toString();
        }
    }
}