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/*
 * This file is part of Zql.
 *
 * Zql is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Zql 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Zql.  If not, see .
 */

package net.sf.mongodb_jdbc_driver.zql;

import java.util.StringTokenizer;

/**
 * A name/alias association

 * Names can have two forms:
 * 
 * FORM_TABLE for table names ([schema.]table)
 * FORM_COLUMN for column names ([[schema.]table.]column)
 * 
 */
public class ZAliasedName implements java.io.Serializable
{

	private static final long serialVersionUID = 2292475504420572508L;

	String strform_ = "";

	String schema_ = null;

	String table_ = null;

	String column_ = null;

	String alias_ = null;

	public static int FORM_TABLE = 1;

	public static int FORM_COLUMN = 2;

	int form_ = FORM_COLUMN;

	public ZAliasedName()
	{
	}

	/**
	 * Create a new ZAliasedName given it's full name.
	 * 
	 * @param fullname
	 *           The full name: [[schema.]table.]column
	 * @param form
	 *           The name form (FORM_TABLE or FORM_COLUMN)
	 */
	public ZAliasedName(String fullname, int form)
	{

		form_ = form;
		strform_ = new String(fullname);

		StringTokenizer st = new StringTokenizer(fullname, ".");
		switch (st.countTokens())
		{
		case 1:
			if (form == FORM_TABLE) table_ = new String(st.nextToken());
			else column_ = new String(st.nextToken());
			break;
		case 2:
			if (form == FORM_TABLE)
			{
				schema_ = new String(st.nextToken());
				table_ = new String(st.nextToken());
			}
			else
			{
				table_ = new String(st.nextToken());
				column_ = new String(st.nextToken());
			}
			break;
		case 3:
		default:
			schema_ = new String(st.nextToken());
			table_ = new String(st.nextToken());
			column_ = new String(st.nextToken());
			break;
		}
		schema_ = postProcess(schema_);
		table_ = postProcess(table_);
		column_ = postProcess(column_);
	}

	private String postProcess(String val)
	{
		if (val == null) return null;
		if (val.indexOf("(") >= 0) val = val.substring(val.lastIndexOf("(") + 1);
		if (val.indexOf(")") >= 0) val = val.substring(0, val.indexOf(")"));
		return val.trim();
	}

	public String toString()
	{
		if (alias_ == null) return strform_;
		else return strform_ + " " + alias_;
	}

	/**
	 * @return If the name is of the form schema.table.column, returns the schema part
	 */
	public String getSchema()
	{
		return schema_;
	}

	/**
	 * @return If the name is of the form [schema.]table.column, returns the schema part
	 */
	public String getTable()
	{
		return table_;
	}

	/**
	 * @return The name is of the form [[schema.]table.]column: return the column part
	 */
	public String getColumn()
	{
		return column_;
	}

	/**
	 * @return true if column is "*", false otherwise. Example: *, table.* are wildcards.
	 */
	public boolean isWildcard()
	{
		if (form_ == FORM_TABLE) return table_ != null && table_.equals("*");
		else return column_ != null && column_.indexOf('*') >= 0;
	}

	/**
	 * @return the alias associated to the current name.
	 */
	public String getAlias()
	{
		return alias_;
	}

	/**
	 * Associate an alias with the current name.
	 * 
	 * @param a
	 *           the alias associated to the current name.
	 */
	public void setAlias(String a)
	{
		alias_ = new String(a);
	}
}