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/*  Copyright 1999 Vince Via [email protected]
    Licensed 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 com.viaoa.datasource.jdbc.db;

import java.util.Enumeration;
import java.util.Hashtable;

import com.viaoa.object.OAObject;
import com.viaoa.util.OAArray;

/**
 * Used for defining a Database for OADataSourceJDBC.
 */
public class Database {

	private Table[] tables = new Table[0];
	private Hashtable hash = new Hashtable();

	/** type of database is generic (currently not used). */
	public static final int DATABASE_GENERIC = 0;
	/** type of database is generic (currently not used). */
	public static final int DATABASE_ACCESS = 1;
	/** maximum number of database types defined (currently not used). */
	public static final int DATABASE_MAX = 2;

	/**
	 * Returns that Table that is mapped to a Class.
	 */
	public Table getTable(Class clazz) {
		if (clazz == null) {
			int xx = 4;
			xx++;
			return null;
		}
		return (Table) hash.get(clazz);
	}

	public Table getTable(String name) {
		if (name == null) {
			return null;
		}

		if (hash != null) {
			Enumeration enumx = hash.elements();
			for (; enumx.hasMoreElements();) {
				Table t = (Table) enumx.nextElement();
				if (name.equalsIgnoreCase(t.name)) {
					return t;
				}
			}
		}
		for (int i = 0; tables != null && i < tables.length; i++) {
			if (name.equalsIgnoreCase(tables[i].name)) {
				return tables[i];
			}
		}
		return null;
	}

	public void removeTable(Table table) {
		this.tables = (Table[]) OAArray.removeValue(Table.class, this.tables, table);
		hash.remove(table.clazz);
		//todo: include superclasses, like add table
	}

	public void addTable(Table table) {
		if (table == null) {
			return;
		}
		this.tables = (Table[]) OAArray.add(Table.class, this.tables, table);

		if (table.clazz != null) {
			hash.put(table.clazz, table);

			Class sc = table.clazz.getSuperclass();
			if (sc != null && !sc.equals(OAObject.class)) {
				Table stable = (Table) hash.get(sc);
				if (stable != null) {
					int x = (stable.subclasses == null) ? 0 : stable.subclasses.length;
					Class[] cc = new Class[x + 1];
					if (x > 0) {
						System.arraycopy(stable.subclasses, 0, cc, 0, x);
					}
					cc[x] = table.clazz;
					stable.subclasses = cc;
				}
			}
		}
	}

	/**
	 * Sets the Tables that are used in this Database.
	 */
	public void setTables(Table[] tables) {
		if (tables == null) {
			tables = new Table[0];
		}
		hash.clear();

		for (int i = 0; tables != null && i < tables.length; i++) {
			addTable(tables[i]);
		}
	}

	/**
	 * Returns the Tables that are used in this Database.
	 */
	public Table[] getTables() {
		return tables;
	}

}