CollectionItemImpl.java

/**
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright (C) 2007 Matthias Braeuer (braeuer.matthias@web.de).            *
 * All rights reserved.                                                      *
 *                                                                           *
 * This work was done as a project at the Chair for Software Technology,     *
 * Dresden University Of Technology, Germany (http://st.inf.tu-dresden.de).  *
 * It is understood that any modification not identified as such is not      *
 * covered by the preceding statement.                                       *
 *                                                                           *
 * This work is free software; you can redistribute it and/or modify it      *
 * under the terms of the GNU Library General Public License as published    *
 * by the Free Software Foundation; either version 2 of the License, or      *
 * (at your option) any later version.                                       *
 *                                                                           *
 * This work 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 Library General Public     *
 * License for more details.                                                 *
 *                                                                           *
 * You should have received a copy of the GNU Library General Public License *
 * along with this library; if not, you can view it online at                *
 * http://www.fsf.org/licensing/licenses/gpl.html.                           *
 *                                                                           *
 * To submit a bug report, send a comment, or get the latest news on this    *
 * project, please visit the website: http://dresden-ocl.sourceforge.net.    *
 * For more information on OCL and related projects visit the OCL Portal:    *
 * http://st.inf.tu-dresden.de/ocl                                           *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 * $Id$
 */
package org.dresdenocl.essentialocl.expressions.impl;

import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.NotificationChain;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.InternalEObject;
import org.eclipse.emf.ecore.impl.ENotificationImpl;

import org.dresdenocl.essentialocl.expressions.CollectionItem;
import org.dresdenocl.essentialocl.expressions.OclExpression;
import org.dresdenocl.essentialocl.expressions.WellformednessException;
import org.dresdenocl.pivotmodel.Type;

/**
 * <!-- begin-user-doc --> An implementation of the model object '<em><b>Collection Item</b></em>'.
 * <!-- end-user-doc -->
 * <p>
 * The following features are implemented:
 * <ul>
 *   <li>{@link org.dresdenocl.essentialocl.expressions.impl.CollectionItemImpl#getItem <em>Item</em>}</li>
 * </ul>
 * </p>
 *
 * @generated
 */
public class CollectionItemImpl extends CollectionLiteralPartImpl implements
		CollectionItem {

	/**
	 * The cached value of the '{@link #getItem() <em>Item</em>}' containment reference. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @see #getItem()
	 * @generated
	 * @ordered
	 */
	protected OclExpression item;

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	protected CollectionItemImpl() {
		super();
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	protected EClass eStaticClass() {
		return ExpressionsPackageImpl.Literals.COLLECTION_ITEM;
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public OclExpression getItem() {
		return item;
	}

	/**
	 * Overridden to determine the type of the <code>CollectionItem</code> according to the OCL
	 * specification (Section 8.3):
	 * 
	 * <p>
	 * The type of a CollectionItem is the type of the item expression.
	 * 
	 * <pre>
	 *   context CollectionItem
	 *   inv: type = item.type
	 * </pre>
	 * 
	 * </p>
	 * 
	 * @see org.dresdenocl.pivotmodel.impl.TypedElementImpl#getType()
	 */
	@Override
	public Type evaluateType() {

		// check invariant
		if (item == null) {
			throw new WellformednessException(this,
					"The referenced item of a CollectionLiteralItem must not be null."); //$NON-NLS-1$
		}

		return item.getType();
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public NotificationChain basicSetItem(OclExpression newItem,
			NotificationChain msgs) {
		OclExpression oldItem = item;
		item = newItem;
		if (eNotificationRequired()) {
			ENotificationImpl notification = new ENotificationImpl(this,
					Notification.SET,
					ExpressionsPackageImpl.COLLECTION_ITEM__ITEM, oldItem,
					newItem);
			if (msgs == null)
				msgs = notification;
			else
				msgs.add(notification);
		}
		return msgs;
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public void setItem(OclExpression newItem) {
		if (newItem != item) {
			NotificationChain msgs = null;
			if (item != null)
				msgs = ((InternalEObject) item).eInverseRemove(this,
						EOPPOSITE_FEATURE_BASE
								- ExpressionsPackageImpl.COLLECTION_ITEM__ITEM,
						null, msgs);
			if (newItem != null)
				msgs = ((InternalEObject) newItem).eInverseAdd(this,
						EOPPOSITE_FEATURE_BASE
								- ExpressionsPackageImpl.COLLECTION_ITEM__ITEM,
						null, msgs);
			msgs = basicSetItem(newItem, msgs);
			if (msgs != null)
				msgs.dispatch();
		} else if (eNotificationRequired())
			eNotify(new ENotificationImpl(this, Notification.SET,
					ExpressionsPackageImpl.COLLECTION_ITEM__ITEM, newItem,
					newItem));
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public NotificationChain eInverseRemove(InternalEObject otherEnd,
			int featureID, NotificationChain msgs) {
		switch (featureID) {
		case ExpressionsPackageImpl.COLLECTION_ITEM__ITEM:
			return basicSetItem(null, msgs);
		}
		return super.eInverseRemove(otherEnd, featureID, msgs);
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public Object eGet(int featureID, boolean resolve, boolean coreType) {
		switch (featureID) {
		case ExpressionsPackageImpl.COLLECTION_ITEM__ITEM:
			return getItem();
		}
		return super.eGet(featureID, resolve, coreType);
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void eSet(int featureID, Object newValue) {
		switch (featureID) {
		case ExpressionsPackageImpl.COLLECTION_ITEM__ITEM:
			setItem((OclExpression) newValue);
			return;
		}
		super.eSet(featureID, newValue);
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public void eUnset(int featureID) {
		switch (featureID) {
		case ExpressionsPackageImpl.COLLECTION_ITEM__ITEM:
			setItem((OclExpression) null);
			return;
		}
		super.eUnset(featureID);
	}

	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public boolean eIsSet(int featureID) {
		switch (featureID) {
		case ExpressionsPackageImpl.COLLECTION_ITEM__ITEM:
			return item != null;
		}
		return super.eIsSet(featureID);
	}

} // CollectionItemImpl