/*

   Derby - Class org.apache.derby.impl.sql.execute.rts.RealProjectRestrictStatistics

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to you under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package org.apache.derby.impl.sql.execute.rts;

import org.apache.derby.iapi.sql.execute.ResultSetStatistics;
import org.apache.derby.catalog.UUID;
import org.apache.derby.impl.sql.catalog.XPLAINResultSetTimingsDescriptor;
import org.apache.derby.impl.sql.execute.xplain.XPLAINUtil;

import org.apache.derby.iapi.services.io.ArrayUtil;
import org.apache.derby.iapi.services.io.StoredFormatIds;

import org.apache.derby.iapi.services.i18n.MessageService;
import org.apache.derby.iapi.reference.SQLState;

import org.apache.derby.iapi.services.io.FormatableHashtable;
import org.apache.derby.iapi.sql.execute.xplain.XPLAINVisitor;

import java.io.ObjectOutput;
import java.io.ObjectInput;
import java.io.IOException;

/**
  ResultSetStatistics implemenation for ProjectRestrictResultSet.


*/
public class RealProjectRestrictStatistics 
	extends RealNoPutResultSetStatistics
{

	/* Leave these fields public for object inspectors */
	public boolean doesProjection;
	public boolean restriction;
	public long restrictionTime;
	public long projectionTime;
	public ResultSetStatistics childResultSetStatistics;
	public ResultSetStatistics[] subqueryTrackingArray;

	// CONSTRUCTORS

	/**
	 * 
	 *
	 */
    public	RealProjectRestrictStatistics(
								int numOpens,
								int rowsSeen,
								int rowsFiltered,
								long constructorTime,
								long openTime,
								long nextTime,
								long closeTime,
								int resultSetNumber,
								long restrictionTime,
								long projectionTime,
								ResultSetStatistics[] subqueryTrackingArray,
								boolean restriction,
								boolean doesProjection,
								double optimizerEstimatedRowCount,
								double optimizerEstimatedCost,
								ResultSetStatistics childResultSetStatistics
								)
	{
		super(
			numOpens,
			rowsSeen,
			rowsFiltered,
			constructorTime,
			openTime,
			nextTime,
			closeTime,
			resultSetNumber,
			optimizerEstimatedRowCount,
			optimizerEstimatedCost
			);
		this.restriction = restriction;
		this.doesProjection = doesProjection;
		this.restrictionTime = restrictionTime;
		this.projectionTime = projectionTime;
        this.subqueryTrackingArray = ArrayUtil.copy(subqueryTrackingArray);
		this.childResultSetStatistics = childResultSetStatistics;
	}

	// ResultSetStatistics methods

	/**
	 * Return the statement execution plan as a String.
	 *
	 * @param depth	Indentation level.
	 *
	 * @return String	The statement execution plan as a String.
	 */
	public String getStatementExecutionPlanText(int depth)
	{
		String subqueryInfo = "";

		initFormatInfo(depth);

		/* Dump out the statistics for any subqueries */

		if (subqueryTrackingArray != null)
		{
			boolean	foundAttached = false;

			for (int index = 0; index < subqueryTrackingArray.length; index++)
			{
				if (subqueryTrackingArray[index] != null)
				{
					/* Only print attached subqueries message once */
					if (! foundAttached)
					{
						subqueryInfo = indent +
							MessageService.getTextMessage(
												SQLState.RTS_ATTACHED_SQS) +
								":\n";
						foundAttached = true;
					}
					subqueryInfo = subqueryInfo +
						subqueryTrackingArray[index].getStatementExecutionPlanText(sourceDepth);
				}
			}
		}

		return
			subqueryInfo +
			indent + MessageService.getTextMessage(SQLState.RTS_PR_RS) +
				" (" +	resultSetNumber + "):" + "\n" +
			indent + MessageService.getTextMessage(SQLState.RTS_NUM_OPENS) +
				" = " + numOpens + "\n" +
			indent + MessageService.getTextMessage(SQLState.RTS_ROWS_SEEN) +
				" = " + rowsSeen + "\n" +
			indent + MessageService.getTextMessage(
												SQLState.RTS_ROWS_FILTERED) +
				" = " + rowsFiltered + "\n" +
			indent + MessageService.getTextMessage(
													SQLState.RTS_RESTRICTION) +
				" = " + restriction + "\n" +
			indent + MessageService.getTextMessage(SQLState.RTS_PROJECTION) +
				" = " + doesProjection + "\n" +
			dumpTimeStats(indent, subIndent) + "\n" +
			subIndent + MessageService.getTextMessage(
												SQLState.RTS_RESTRICTION_TIME) +
				" = " + restrictionTime + "\n" +
			subIndent + MessageService.getTextMessage(
												SQLState.RTS_PROJECTION_TIME) +
				" = " + projectionTime + "\n" +
			dumpEstimatedCosts(subIndent) + "\n" +
			indent + MessageService.getTextMessage(SQLState.RTS_SOURCE_RS) +
				":" + "\n" +
			childResultSetStatistics.getStatementExecutionPlanText(sourceDepth);
	}

	/**
	 * Return information on the scan nodes from the statement execution 
	 * plan as a String.
	 *
	 * @param depth	Indentation level.
	 * @param tableName if not NULL then print information for this table only
	 *
	 * @return String	The information on the scan nodes from the 
	 *					statement execution plan as a String.
	 */
	public String getScanStatisticsText(String tableName, int depth)
	{
		String subqueryInfo = "";

		/* Dump out the statistics for any subqueries */

		/* RESOLVE - until we externalize RunTimeStats, we just use
		 * this.subqueryTrackingArray since we are currently getting called
		 * on a close() and the StatementContext has changed and doesn't have
		 * a pointer to the top result set.  When we externalize RunTimeStats,
		 * the JDBC Driver will have to push a new context and we will have
		 * to assign the top resultset there.  (Not sure what to do about
		 * insert/update/delete.)
		 *
		NoPutResultSet[] subqueryTrackingArray = sc.getSubqueryTrackingArray();
		 */			

		if (subqueryTrackingArray != null)
		{
			for (int index = 0; index < subqueryTrackingArray.length; index++)
			{
				if (subqueryTrackingArray[index] != null)
				{
					subqueryInfo = subqueryInfo +
								   "\n" +
									MessageService.getTextMessage(
												SQLState.RTS_BEGIN_SQ_NUMBER) +
									" " + index + "\n" +
						subqueryTrackingArray[index].getScanStatisticsText(tableName, depth) +
						MessageService.getTextMessage(
												SQLState.RTS_END_SQ_NUMBER) +
						" " + index + "\n\n";
				}
			}
		}

		return subqueryInfo 
			+ childResultSetStatistics.getScanStatisticsText(tableName, depth);
	}



	// Class implementation
	
	public String toString()
	{
		return getStatementExecutionPlanText(0);
	}
  public java.util.Vector<ResultSetStatistics> getChildren(){
    java.util.Vector<ResultSetStatistics> children = new java.util.Vector<ResultSetStatistics>();
    children.addElement(childResultSetStatistics);

	// get all of our subqueries
	if (subqueryTrackingArray != null)
	{
		for (int index = 0; index < subqueryTrackingArray.length; index++)
		{
			if (subqueryTrackingArray[index] != null)
			{
				children.addElement(subqueryTrackingArray[index]);
			}
		}
	}
    return children;
  }
	/**
   * Format for display, a name for this node.
	 *
	 */
  public String getNodeName(){
    return MessageService.getTextMessage(SQLState.RTS_PR);
  }
  
  // -----------------------------------------------------
  // XPLAINable Implementation
  // -----------------------------------------------------
  
    public void accept(XPLAINVisitor visitor) {
        // compute number of children of this node, which get visited
        int noChildren = 0;
        if(this.childResultSetStatistics!=null) noChildren++;
        if(this.subqueryTrackingArray!=null){
            noChildren += subqueryTrackingArray.length;
        }
        // inform the visitor
        visitor.setNumberOfChildren(noChildren);

        // pre-order, depth-first traversal
        // me first
        visitor.visit(this);
        // then my direct child
        if(childResultSetStatistics!=null){
            childResultSetStatistics.accept(visitor);
        }
        // and now the dependant resultsets, if there are any
        if (subqueryTrackingArray != null)
        {
            boolean foundAttached = false;

            for (int index = 0; index < subqueryTrackingArray.length; index++)
            {
                if (subqueryTrackingArray[index] != null)
                {
                    // TODO add additional dependant referential action ?
                    /*
                    if (! foundAttached)
                    {
                        dependentInfo = indent  + "\n" +
                            MessageService.getTextMessage(
                                                SQLState.RTS_REFACTION_DEPENDENT) +
                                ":\n";
                        foundAttached = true;
                    }*/
                    
                    subqueryTrackingArray[index].accept(visitor);
                }
            }
        }
    }
    public String getRSXplainType()
    {
        
        if (this.restriction && this.doesProjection)
            return XPLAINUtil.OP_PROJ_RESTRICT;
        if (this.doesProjection)
            return XPLAINUtil.OP_PROJECT;
        if (this.restriction)
            return XPLAINUtil.OP_FILTER;
        return XPLAINUtil.OP_PROJ_RESTRICT;
    }
    public String getRSXplainDetails()
    {
        return this.resultSetNumber + ";";
    }
    public Object getResultSetTimingsDescriptor(Object timingID)
    {
        return new XPLAINResultSetTimingsDescriptor(
           (UUID)timingID,
           this.constructorTime,
           this.openTime,
           this.nextTime,
           this.closeTime,
           this.getNodeTime(),
           XPLAINUtil.getAVGNextTime( (long)this.nextTime, this.rowsSeen),
           this.projectionTime,
           this.restrictionTime,
           null,                          // the temp_cong_create_time
           null                           // the temo_cong_fetch_time
        );
    }
}
