/*

   Derby - Class org.apache.derby.impl.sql.execute.ColumnInfo

   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;

import org.apache.derby.shared.common.util.ArrayUtil;
import org.apache.derby.iapi.services.io.Formatable;
import org.apache.derby.iapi.services.io.StoredFormatIds;

import org.apache.derby.iapi.types.DataTypeDescriptor;
import org.apache.derby.iapi.types.DataValueDescriptor;
import org.apache.derby.iapi.sql.depend.ProviderInfo;
import org.apache.derby.shared.common.sanity.SanityManager;

import org.apache.derby.catalog.DefaultInfo;
import org.apache.derby.catalog.UUID;

import org.apache.derby.iapi.services.io.FormatableArrayHolder;
import org.apache.derby.iapi.services.io.FormatableHashtable;
import org.apache.derby.iapi.services.io.FormatableLongHolder;

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

/**
 *	This is the Column descriptor that is passed from Compilation to Execution
 *	for CREATE TABLE statements.
 *
 *	@version 0.1
 */

public class ColumnInfo implements Formatable
{
	/********************************************************
	**
	**	This class implements Formatable. That means that it
	**	can write itself to and from a formatted stream. If
	**	you add more fields to this class, make sure that you
	**	also write/read them with the writeExternal()/readExternal()
	**	methods.
	**
	**	If, inbetween releases, you add more fields to this class,
	**	then you should bump the version number emitted by the getTypeFormatId()
	**	method.
	**
	********************************************************/

    int                         action;
    String                      name;
    DataTypeDescriptor          dataType;
    DefaultInfo                 defaultInfo;
    ProviderInfo[]              providers;
    DataValueDescriptor         defaultValue;
    UUID                        newDefaultUUID;
    UUID                        oldDefaultUUID;
	// autoinc columns.
    long                        autoincStart;
    long                        autoincInc;
    boolean                        autoincCycle;
	//if this is an autoincrement column, then following variable will have CREATE or
	//MODIFY_COLUMN_DEFAULT_RESTART or MODIFY_COLUMN_DEFAULT_INCREMENT. Otherwise,
	//this variable will be set to -1.
    long                        autoinc_create_or_modify_Start_Increment = -1;

	//This indicates column is for CREATE TABLE
	public static final int CREATE					= 0;
	public static final int DROP					= 1;
	public static final int MODIFY_COLUMN_TYPE      = 2;
	public static final int MODIFY_COLUMN_CONSTRAINT = 3;
	public static final int MODIFY_COLUMN_CONSTRAINT_NOT_NULL = 4;
	//This indicates column is for ALTER TABLE to change the start value of autoinc column 
	public static final int MODIFY_COLUMN_DEFAULT_RESTART	= 5;
	//This indicates column is for ALTER TABLE to change the increment value of autoinc column 
	public static final int MODIFY_COLUMN_DEFAULT_INCREMENT	= 6;
	public static final int MODIFY_COLUMN_DEFAULT_VALUE	= 7;
	//This change the generation property of autoinc columns
	public static final int MODIFY_COLUMN_GENERATED_ALWAYS	= 8;
	public static final int MODIFY_COLUMN_GENERATED_BY_DEFAULT	= 9;

	public static final int MODIFY_COLUMN_DEFAULT_CYCLE = 10;
	// CONSTRUCTORS

	/**
	 * Public niladic constructor. Needed for Formatable interface to work.
	 *
	 */
    public	ColumnInfo() {}

	/**
	 *	Make one of these puppies.
	 *
	 *  @param name			Column name.
	 *  @param dataType		Column type.
	 *  @param defaultValue	Column default value.
	 *  @param defaultInfo	Column default info.
	 *  @param providers   Array of providers that this column depends on.
	 *  @param newDefaultUUID	New UUID for default.
	 *  @param oldDefaultUUID	Old UUID for default.
	 *	@param action		Action (create, modify default, etc.)
	 * 	@param autoincStart Start of autoincrement values.
	 *  @param autoincInc	Increment of autoincrement values-- if parameter
	 *						is 0, it implies that this is not an autoincrement
	 *						value.
	 */
	public	ColumnInfo(
		               String						name,
					   DataTypeDescriptor			dataType,
					   DataValueDescriptor			defaultValue,
					   DefaultInfo					defaultInfo,
					   ProviderInfo[]					providers,
					   UUID							newDefaultUUID,
					   UUID							oldDefaultUUID,
					   int							action,
					   long							autoincStart,
					   long							autoincInc,
					   boolean						autoincCycle,
					   long							autoinc_create_or_modify_Start_Increment)
	{
		this.name = name;
		this.dataType = dataType;
		this.defaultValue = defaultValue;
		this.defaultInfo = defaultInfo;
        this.providers = ArrayUtil.copy(providers);
		this.newDefaultUUID = newDefaultUUID;
		this.oldDefaultUUID = oldDefaultUUID;
		this.action = action;
		this.autoincStart = autoincStart;
		this.autoincInc = autoincInc;
		this.autoincCycle = autoincCycle;
		this.autoinc_create_or_modify_Start_Increment = autoinc_create_or_modify_Start_Increment;
	}

	// Formatable methods

	/**
	 * Read this object from a stream of stored objects.
	 *
	 * @param in read this.
	 *
	 * @exception IOException					thrown on error
	 * @exception ClassNotFoundException		thrown on error
	 */
	public void readExternal( ObjectInput in )
		 throws IOException, ClassNotFoundException
	{

		FormatableLongHolder flh;

		FormatableHashtable fh = (FormatableHashtable)in.readObject();
		name = (String)fh.get("name");
		dataType = (DataTypeDescriptor) fh.get("dataType");
		defaultValue = (DataValueDescriptor)fh.get("defaultValue");
		defaultInfo = (DefaultInfo)fh.get("defaultInfo");
		newDefaultUUID = (UUID)fh.get("newDefaultUUID");
		oldDefaultUUID = (UUID)fh.get("oldDefaultUUID");
		action = fh.getInt("action");
		
		if (fh.get("autoincStart") != null)
		{
			autoincStart = fh.getLong("autoincStart");
			autoincInc = fh.getLong("autoincInc");
		}
		else
		{
			autoincInc = autoincStart = 0;
		}

        FormatableArrayHolder   fah = (FormatableArrayHolder) fh.get( "providers" );
        if ( fah != null )
        {
            providers = fah.getArray(ProviderInfo[].class);
        }
	}

	/**
	 * Write this object to a stream of stored objects.
	 *
	 * @param out write bytes here.
	 *
	 * @exception IOException		thrown on error
	 */
	public void writeExternal( ObjectOutput out )
		 throws IOException
	{
		FormatableHashtable fh = new FormatableHashtable();
		fh.put("name", name);
		fh.put("dataType", dataType);
		fh.put("defaultValue", defaultValue);
		fh.put("defaultInfo", defaultInfo);
		fh.put("newDefaultUUID", newDefaultUUID);
		fh.put("oldDefaultUUID", oldDefaultUUID );
		fh.putInt("action", action);
		
		if (autoincInc != 0)
		{
			// only write out autoinc values if its an autoinc column.
			fh.putLong("autoincStart", autoincStart);
			fh.putLong("autoincInc", autoincInc);
		}

        if ( providers != null )
        {
            FormatableArrayHolder   fah = new FormatableArrayHolder( providers );
            fh.put( "providers", fah );
        }
        
		out.writeObject(fh);
	}
 
	/**
	 * Get the formatID which corresponds to this class.
	 *
	 *	@return	the formatID of this class
	 */
	public	int	getTypeFormatId()	{ return StoredFormatIds.COLUMN_INFO_V02_ID; }

    // Accessors

    public DataTypeDescriptor getDataType() {
        return dataType;
    }

	/*
	  Object methods.
	  */
	public String toString()
	{
		if (SanityManager.DEBUG)
		{
			String	traceName;
			String  traceDataType;
			String  traceDefaultValue;
			String  traceDefaultInfo;
			String  traceNewDefaultUUID;
			String  traceOldDefaultUUID;
			String  traceAction;
			String  traceAI;
			if (name == null)
			{
				traceName = "name: null ";
			}
			else
			{
				traceName = "name: "+name+" ";
			}

			if (dataType == null)
			{
				traceDataType = "dataType: null ";
			}
			else
			{
				traceDataType = "dataType: "+dataType+" ";
			}

			if (defaultValue == null)
			{
				traceDefaultValue = "defaultValue: null ";
			}
			else
			{
				traceDefaultValue = "defaultValue: "+defaultValue+" ";
			}

			if (defaultInfo == null)
			{
				traceDefaultInfo = "defaultInfo: null ";
			}
			else
			{
				traceDefaultInfo = "defaultInfo: "+defaultInfo+" ";
			}

			if (newDefaultUUID == null)
			{
				traceNewDefaultUUID = "newDefaultUUID: null ";
			}
			else
			{
				traceNewDefaultUUID = "newDefaultUUID: "+newDefaultUUID+" ";
			}

			if (oldDefaultUUID == null)
			{
				traceOldDefaultUUID = "oldDefaultUUID: null ";
			}
			else
			{
				traceOldDefaultUUID = "oldDefaultUUID: "+oldDefaultUUID+" ";
			}

			traceAction = "action: "+action+" ";

			if (autoincInc != 0)
			{
				traceAI = "autoincrement, start: " + autoincStart +
					" increment:" + autoincInc;
			}
			else
			{
				traceAI = "NOT autoincrement";
			}
			return "ColumnInfo: ("+traceName+traceDataType+traceDefaultValue+
							   traceDefaultInfo+traceNewDefaultUUID+traceOldDefaultUUID+traceAction+traceAI+")";
		}
		else
		{
			return "";
		}
	}
}
