/*
 This file belongs to the Servoy development and deployment environment, Copyright (C) 1997-2010 Servoy BV

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Affero General Public License as published by the Free
 Software Foundation; either version 3 of the License, or (at your option) any
 later version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License along
 with this program; if not, see http://www.gnu.org/licenses or write to the Free
 Software Foundation,Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 */
package com.servoy.j2db.persistence;


import java.io.Serializable;
import java.util.Arrays;

/**
 * Binds column and relations together in one entity
 * 
 * @author jblok
 */
public class ColumnWrapper implements IDataProvider, Serializable
{
/*
 * _____________________________________________________________ Declaration of attributes
 */
	private final Relation[] relations;
	private final IColumn column;
	private final RelationList relatonList;

/*
 * _____________________________________________________________ Declaration and definition of constructors
 */
	public ColumnWrapper(IColumn column)
	{
		this(column, (Relation[])null);
	}

	public ColumnWrapper(IColumn column, Relation relation)
	{
		this(column, relation == null ? ((Relation[])null) : new Relation[] { relation });
	}

	public ColumnWrapper(IColumn column, Relation[] relations)
	{
		this.column = column;
		this.relations = (relations == null || relations.length == 0 || relations[0] == null) ? null : relations;
		this.relatonList = null;
	}

	public ColumnWrapper(IColumn column, RelationList relationList)
	{
		this.column = column;
		this.relations = null;
		this.relatonList = relationList;
	}

/*
 * _____________________________________________________________ The methods below override methods from superclass <classname>
 */


/*
 * _____________________________________________________________ The methods below belong to interface <interfacename>
 */

/*
 * _____________________________________________________________ The methods below belong to this class
 */

	public Relation[] getRelations()
	{
		if (relatonList != null) return relatonList.getRelations();
		return relations;
	}

	public RelationList getRelationList()
	{
		if (relatonList != null) return relatonList;
		if (relations != null)
		{
			RelationList list = new RelationList(relations[0]);
			for (int i = 1; i < relations.length; i++)
			{
				list = new RelationList(list, relations[i]);
			}
			return list;
		}
		return null;
	}

	public IColumn getColumn()
	{
		return column;
	}

	public String getName()
	{
		return prefixRelation(column.getName());
	}

	@Override
	public String toString()
	{
		return getName();
	}

	public String getDataProviderID()//get the id
	{
		return prefixRelation(column.getDataProviderID());
	}

	protected String prefixRelation(String s)//get the id
	{
		if (relations == null && relatonList == null)
		{
			return s;
		}

		Relation[] rels = this.relations;
		if (relatonList != null) rels = relatonList.getRelations();

		StringBuilder sb = new StringBuilder(rels.length * 45);
		for (Relation relation : rels)
		{
			sb.append(relation.getName());
			sb.append('.');
		}
		sb.append(s);
		return sb.toString();
	}

	public int getDataProviderType()
	{
		return column.getDataProviderType();
	}

	public ColumnWrapper getColumnWrapper()
	{
		return this;
	}

	public int getLength()
	{
		return column.getLength();
	}

	public boolean isEditable()
	{
		return column.isEditable();
	}

	public int getFlags()
	{
		return column.getFlags();
	}

	@Override
	public int hashCode()
	{
		final int prime = 31;
		int result = 1;
		result = prime * result + ((column == null) ? 0 : column.hashCode());
		if (relatonList != null) result = prime * result + relatonList.hashCode();
		else result = prime * result + Arrays.hashCode(relations);
		return result;
	}

	protected boolean equalColumnWrapper(ColumnWrapper other)
	{
		if (column == null)
		{
			if (other.column != null) return false;
		}
		else if (!column.equals(other.column)) return false;
		// relation data is either stored in relations or in relationList
		if (relatonList != null && other.relatonList != null)
		{
			return relatonList.equals(other.relatonList);

		}
		return Arrays.equals(getRelations(), other.getRelations());
	}

	@Override
	public boolean equals(Object obj)
	{
		if (this == obj) return true;
		if (obj == null) return false;
		if (getClass() != obj.getClass()) return false;
		return equalColumnWrapper((ColumnWrapper)obj);
	}

}