/*
 Wotonomy: OpenStep design patterns for pure Java applications.
 Copyright (C) 2001 Michael Powers

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library 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
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, see http://www.gnu.org
 */
package net.wotonomy.access;

import net.wotonomy.control.EOFetchSpecification;
import net.wotonomy.control.EOObjectStoreCoordinator;
import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSDictionary;
import net.wotonomy.foundation.NSMutableDictionary;

/**
 * A group of models that connect to the same database. Entities in these models
 * can have relationships that point to other entities in any model of the same
 * group.
 *
 * @author ezamudio@nasoft.com
 * @author $Author: cgruber $
 * @version $Revision: 894 $
 */
public class EOModelGroup {

	private static EOModelGroup _defaultGroup;
	private static EOModelGroup _globalGroup;
	protected NSMutableDictionary _models;

	public EOModelGroup() {
		super();
	}

	public void addModel(EOModel model) {
		if (model.name() == null)
			throw new IllegalArgumentException("Cannot add an unnamed model to a group.");
		if (_models.objectForKey(model.name()) != null)
			throw new IllegalArgumentException("Cannot add model " + model.name()
					+ " to group because it already contains a model with the same name.");
		NSArray ents = model.entityNames();
		for (int i = 0; i < ents.count(); i++) {
			String ename = (String) ents.objectAtIndex(i);
			if (entityNamed(ename) != null)
				throw new IllegalArgumentException(
						"Cannot add model " + model.name() + " to group because it contains entity named " + ename);
		}
		_models.setObjectForKey(model, model.name());
	}

	public void removeModel(EOModel model) {
		_models.removeObjectForKey(model.name());
	}

	public void addModelWithPath(String path) {
		EOModel model = new EOModel(path);
		addModel(model);
	}

	public void addModelsFromDirectory(String dir) {
	}

	public static void setDefaultGroup(EOModelGroup group) {
		_defaultGroup = group;
	}

	public static EOModelGroup defaultGroup() {
		if (_defaultGroup == null) {
			_defaultGroup = globalModelGroup();
		}
		return _defaultGroup;
	}

	public static EOModelGroup globalModelGroup() {
		if (_globalGroup == null) {
			_globalGroup = new EOModelGroup();
			// TODO: read all frameworks and get models from them
		}
		return _globalGroup;
	}

	public EOEntity entityForObject(net.wotonomy.control.EOEnterpriseObject eo) {
		return null;
	}

	public EOEntity entityNamed(String name) {
		java.util.Enumeration enumeration = _models.objectEnumerator();
		while (enumeration.hasMoreElements()) {
			EOModel m = (EOModel) enumeration.nextElement();
			if (m.entityNamed(name) != null)
				return m.entityNamed(name);
		}
		return null;
	}

	public EOModel modelNamed(String name) {
		return (EOModel) _models.objectForKey(name);
	}

	public NSArray modelNames() {
		return _models.allKeys();
	}

	public NSArray models() {
		return _models.allValues();
	}

	public EOModel modelWithPath(String path) {
		java.util.Enumeration enumeration = _models.objectEnumerator();
		while (enumeration.hasMoreElements()) {
			EOModel m = (EOModel) enumeration.nextElement();
			if (m.path() != null && m.path().equals(path))
				return m;
		}
		return null;
	}

	public EOStoredProcedure storedProcedureNamed(String name) {
		java.util.Enumeration enumeration = _models.objectEnumerator();
		while (enumeration.hasMoreElements()) {
			EOModel m = (EOModel) enumeration.nextElement();
			if (m.storedProcedureNamed(name) != null)
				return m.storedProcedureNamed(name);
		}
		return null;
	}

	public EOFetchSpecification fetchSpecificationNamed(String fetchSpecName, String entityName) {
		EOEntity e = entityNamed(entityName);
		if (e == null)
			return null;
		return e.fetchSpecificationNamed(fetchSpecName);
	}

	public void loadAllModelObjects() {
		java.util.Enumeration enumeration = _models.objectEnumerator();
		while (enumeration.hasMoreElements()) {
			EOModel m = (EOModel) enumeration.nextElement();
			// this causes all entities to be loaded
			NSArray ents = m.entities();
			for (int i = 0; i < ents.count(); i++) {
				EOEntity e = (EOEntity) ents.objectAtIndex(i);
				// this loads all the fetch specifications
				e.fetchSpecificationNamed("whatever");
			}
		}
	}

	public static void setModelGroupForObjectStoreCoordinator(EOObjectStoreCoordinator coord, EOModelGroup group) {
		NSMutableDictionary d = new NSMutableDictionary(coord.userInfo());
		d.setObjectForKey(group, "ModelGroup");
		coord.setUserInfo(d);
	}

	public static EOModelGroup modelGroupForObjectStoreCoordinator(EOObjectStoreCoordinator coord) {
		NSDictionary d = coord.userInfo();
		if (d == null)
			return defaultGroup();
		Object g = d.objectForKey("ModelGroup");
		if (g != null && g instanceof EOModelGroup)
			return (EOModelGroup) g;
		return defaultGroup();
	}

}
/*
 * $Log$ Revision 1.2 2006/02/16 16:47:14 cgruber Move some classes in to
 * "internal" packages and re-work imports, etc.
 *
 * Also use UnsupportedOperationExceptions where appropriate, instead of
 * WotonomyExceptions.
 *
 * Revision 1.1 2006/02/16 13:19:57 cgruber Check in all sources in
 * eclipse-friendly maven-enabled packages.
 *
 * Revision 1.4 2005/05/11 15:21:53 cgruber Change enum to enumeration, since
 * enum is now a keyword as of Java 5.0
 *
 * A few other comments in the code.
 *
 * Revision 1.3 2003/08/08 00:44:04 chochos manage model groups for object store
 * coordinators.
 *
 * Revision 1.2 2003/08/08 00:36:41 chochos add a little more functionality
 *
 * Revision 1.1 2003/08/07 02:42:28 chochos EOModel can read an .eomodeld file.
 * EOModelGroup doesn't do much for now.
 *
 */